Recent Additions

This page includes the documents that were newly added to the repository within the last 30 days.

All these words:

This exact word or phrase:

Any of these words:

None of these words:

Language:

Visit our Help Page for additional assistance

Select a Range:

Select a Format:

Custom Search Builder:

Custom Search Box

Visit our Help Page for additional assistance

Showing 141 - 160 of 527 results

Comparison of Results Obtained From the French Rutting Tester With Pavements of Known Performance

Aschenbrener, Timothy B. ;

Stuart, Kevin

1992-10-01 | PDF

The French rutting tester has been used successfully in France to eliminate the occurrence of rutting. The Colorado Department of Transportation (CDOT) and the Turner-Fairbank Highway Research Center (TFHRC) were selected to demonstrate this equipment. Thirty-three sites across Colorado with good and poor performance and a variety of temperature an ...

10/13/2026

Title : Comparison of Results Obtained From the French Rutting Tester With Pavements of Known Performance Creator(s) : Aschenbrener, Timothy B.;Stuart, Kevin; Corporate Creator(s) : Colorado. Department of Transportation Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 1992-10-01 Report Number : CDOT-DTD-R-92-11 URL : https://rosap.ntl.bts.gov/view/dot/93914
Aschenbrener, T. B., & Stuart, K. (1992). Comparison of Results Obtained From the French Rutting Tester With Pavements of Known Performance (Report No. CDOT-DTD-R-92-11). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93914

Aschenbrener, Timothy B. and Kevin Stuart. Comparison of Results Obtained From the French Rutting Tester With Pavements of Known Performance. Report no. CDOT-DTD-R-92-11. Colorado. Department of Transportation, 1992. https://rosap.ntl.bts.gov/view/dot/93914.

Aschenbrener, Timothy B., and Kevin Stuart Comparison of Results Obtained From the French Rutting Tester With Pavements of Known Performance. Colorado. Department of Transportation, 1992, Report no. CDOT-DTD-R-92-11, ROSA P. https://rosap.ntl.bts.gov/view/dot/93914.
Export RIS Citation Information. TY - Tech Report AU - Aschenbrener, Timothy B. AU - Stuart, Kevin A2 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - The French rutting tester has been used successfully in France to eliminate the occurrence of rutting. The Colorado Department of Transportation (CDOT) and the Turner-Fairbank Highway Research Center (TFHRC) were selected to demonstrate this equipment. Thirty-three sites across Colorado with good and poor performance and a variety of temperature and traffic conditions were selected. Test results indicated that the French rutting tester, using the French specifications, was overly severe for many of the temperature and environmental conditions encountered in Colorado. However, by adjusting the testing temperature to match the highest temperature at a site location, the French rutting tester did an excellent job of predicting pavement performance. The results from the French rutting tester also had good correlation with actual rutting depths when temperature and traffic levels were considered. AN - dot:93914 DA - 1992-10-01 ET - Final Report KW - Testing equipment KW - Hot mix asphalt KW - Deformation KW - Correlation analysis KW - Forecasting KW - Pavement performance KW - Pavement ruts KW - Technology KW - Rutting KW - Traffic KW - Temperature KW - Environmental impacts KW - Environment KW - permanent deformation LA - English PB - Colorado. Department of Transportation PY - 1992 SN - CDOT-DTD-R-92-11 TI - Comparison of Results Obtained From the French Rutting Tester With Pavements of Known Performance M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93914 ER -
Estimated FAF Flow for Trucks Going To, From, and Within Iowa on National Highway System 2050

United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations

2022-05-04 | PDF

Major flows include domestic and international freight moving by truck on highway segments with more than twenty-five FAF trucks per day and between places typically more than fifty miles apart. Flows include 42 different commodities represented in FAF. State to State flows represent annual KTons of freight transported by trucks within Iowa, and be ...

10/13/2026

Title : Estimated FAF Flow for Trucks Going To, From, and Within Iowa on National Highway System 2050 Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations Published Date : 2022-05-04 URL : https://rosap.ntl.bts.gov/view/dot/93913
United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations (2022). Estimated FAF Flow for Trucks Going To, From, and Within Iowa on National Highway System 2050. United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations. https://rosap.ntl.bts.gov/view/dot/93913

United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations. Estimated FAF Flow for Trucks Going To, From, and Within Iowa on National Highway System 2050. United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations, 2022. https://rosap.ntl.bts.gov/view/dot/93913.

United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations Estimated FAF Flow for Trucks Going To, From, and Within Iowa on National Highway System 2050. United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations, 2022, ROSA P. https://rosap.ntl.bts.gov/view/dot/93913.
Export RIS Citation Information. TY - Booklet/Pamphlet A2 - United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations AB - Major flows include domestic and international freight moving by truck on highway segments with more than twenty-five FAF trucks per day and between places typically more than fifty miles apart. Flows include 42 different commodities represented in FAF. State to State flows represent annual KTons of freight transported by trucks within Iowa, and between Iowa and other States. Flow does not include imports and exports that use Iowa as the gateway port and go out of the state. AN - dot:93913 DA - 2022-05-04 KW - Freight transportation KW - Commodity flow KW - Traffic flow KW - Truck routes LA - English PB - United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations PY - 2022 TI - Estimated FAF Flow for Trucks Going To, From, and Within Iowa on National Highway System 2050 M3 - Booklet/Pamphlet N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93913 ER -
Estimated FAF Flow for Trucks Passing Through Iowa on National Highway System 2017

United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations

2022-03-29 | PDF

Major flows include domestic and international freight moving by truck on highway segments with more than twenty-five FAF trucks per day and between places typically more than fifty miles apart. Flows include 42 different commodities represented in FAF. State to State flows represent annual KTons of freight transported by trucks that pass through I ...

10/13/2026

Title : Estimated FAF Flow for Trucks Passing Through Iowa on National Highway System 2017 Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations Published Date : 2022-03-29 URL : https://rosap.ntl.bts.gov/view/dot/93912
United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations (2022). Estimated FAF Flow for Trucks Passing Through Iowa on National Highway System 2017. United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations. https://rosap.ntl.bts.gov/view/dot/93912

United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations. Estimated FAF Flow for Trucks Passing Through Iowa on National Highway System 2017. United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations, 2022. https://rosap.ntl.bts.gov/view/dot/93912.

United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations Estimated FAF Flow for Trucks Passing Through Iowa on National Highway System 2017. United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations, 2022, ROSA P. https://rosap.ntl.bts.gov/view/dot/93912.
Export RIS Citation Information. TY - Booklet/Pamphlet A2 - United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations AB - Major flows include domestic and international freight moving by truck on highway segments with more than twenty-five FAF trucks per day and between places typically more than fifty miles apart. Flows include 42 different commodities represented in FAF. State to State flows represent annual KTons of freight transported by trucks that pass through Iowa including imports and exports that use Iowa as the gateway port. AN - dot:93912 DA - 2022-03-29 KW - Freight transportation KW - Commodity flow KW - Traffic flow KW - Truck routes LA - English PB - United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations PY - 2022 TI - Estimated FAF Flow for Trucks Passing Through Iowa on National Highway System 2017 M3 - Booklet/Pamphlet N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93912 ER -
Estimated FAF Flow for Trucks Going To, From, and Within Iowa on National Highway System 2017

United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations

2022-03-29 | PDF

Major flows include domestic and international freight moving by truck on highway segments with more than twenty-five FAF trucks per day and between places typically more than fifty miles apart. Flows include 42 different commodities represented in FAF. State to State flows represent annual KTons of freight transported by trucks within Iowa, and be ...

10/13/2026

Title : Estimated FAF Flow for Trucks Going To, From, and Within Iowa on National Highway System 2017 Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations Published Date : 2022-03-29 URL : https://rosap.ntl.bts.gov/view/dot/93911
United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations (2022). Estimated FAF Flow for Trucks Going To, From, and Within Iowa on National Highway System 2017. United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations. https://rosap.ntl.bts.gov/view/dot/93911

United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations. Estimated FAF Flow for Trucks Going To, From, and Within Iowa on National Highway System 2017. United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations, 2022. https://rosap.ntl.bts.gov/view/dot/93911.

United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations Estimated FAF Flow for Trucks Going To, From, and Within Iowa on National Highway System 2017. United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations, 2022, ROSA P. https://rosap.ntl.bts.gov/view/dot/93911.
Export RIS Citation Information. TY - Booklet/Pamphlet A2 - United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations AB - Major flows include domestic and international freight moving by truck on highway segments with more than twenty-five FAF trucks per day and between places typically more than fifty miles apart. Flows include 42 different commodities represented in FAF. State to State flows represent annual KTons of freight transported by trucks within Iowa, and between Iowa and other States. Flow does not include imports and exports that use Iowa as the gateway port and go out of the state. AN - dot:93911 DA - 2022-03-29 KW - Freight transportation KW - Commodity flow KW - Traffic flow KW - Truck routes LA - English PB - United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations PY - 2022 TI - Estimated FAF Flow for Trucks Going To, From, and Within Iowa on National Highway System 2017 M3 - Booklet/Pamphlet N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93911 ER -
Factors That Affect the Voids in the Mineral Aggregate in Hot Mix Asphalt

Aschenbrener, Timothy B. ;

MacKean, Charles

1992-10-01 | PDF

The Colorado Department of Transportation (CDOT) will be specifying a minimum Voids in the Mineral Aggregate (VMA) for the 1993 construction season. The purpose of this report was to provide guidance and information for obtaining VMA. 101 of the mix designs performed by the CDOT during 1992 were analyzed to determine the most appropriate method for ...

10/13/2026

Title : Factors That Affect the Voids in the Mineral Aggregate in Hot Mix Asphalt Creator(s) : Aschenbrener, Timothy B.;MacKean, Charles; Corporate Creator(s) : Colorado. Department of Transportation Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 1992-10-01 Report Number : CDOT-DTD-R-92-13 URL : https://rosap.ntl.bts.gov/view/dot/93910
Aschenbrener, T. B., & MacKean, C. (1992). Factors That Affect the Voids in the Mineral Aggregate in Hot Mix Asphalt (Report No. CDOT-DTD-R-92-13). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93910

Aschenbrener, Timothy B. and Charles MacKean. Factors That Affect the Voids in the Mineral Aggregate in Hot Mix Asphalt. Report no. CDOT-DTD-R-92-13. Colorado. Department of Transportation, 1992. https://rosap.ntl.bts.gov/view/dot/93910.

Aschenbrener, Timothy B., and Charles MacKean Factors That Affect the Voids in the Mineral Aggregate in Hot Mix Asphalt. Colorado. Department of Transportation, 1992, Report no. CDOT-DTD-R-92-13, ROSA P. https://rosap.ntl.bts.gov/view/dot/93910.
Export RIS Citation Information. TY - Tech Report AU - Aschenbrener, Timothy B. AU - MacKean, Charles A2 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - The Colorado Department of Transportation (CDOT) will be specifying a minimum Voids in the Mineral Aggregate (VMA) for the 1993 construction season. The purpose of this report was to provide guidance and information for obtaining VMA. 101 of the mix designs performed by the CDOT during 1992 were analyzed to determine the most appropriate method for drawing the maximum density line. The Texas reference gradation line and the line drawn from the origin to the actual percent passing on the nominal maximum aggregate size provided the best correlation with measured VMA. Staying away from the maximum density line at the No. 30 sieve and the fourth largest sieve to retain material is advised. In addition, 24 laboratory mix designs were prepared to examine the effect of varying four variables considered important in obtaining VMA: gradation, quantity of P200, size of P200, and fine aggregate angularity. The gradation provided the largest changes in VMA. The quantity of P200 and angularity also caused significant changes to VMA. The quantity of P200 made more substantial changes to the VMA of fine gradations than coarse gradations. The angularity of the fine aggregates affected the VMA of the coarse gradations more than the fine gradations. The size of the P200 had little effect on the VMA; however, although the sizes of P200 of the two materials used in the experiment were significantly different, the sizes were both fine. AN - dot:93910 DA - 1992-10-01 ET - Final Report KW - Mineral aggregates KW - Aggregates KW - Angularity KW - Fine aggregates KW - Hot mix asphalt KW - Mix design KW - Void ratios KW - Voids in Mineral Aggregate KW - Maximum KW - Nominal Maximum Aggregate Size LA - English PB - Colorado. Department of Transportation PY - 1992 SN - CDOT-DTD-R-92-13 TI - Factors That Affect the Voids in the Mineral Aggregate in Hot Mix Asphalt M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93910 ER -
Fiber Pave, Polypropylene Fiber

Harmelink, Donna S.

1992-11-01 | PDF

This report documents the performance of Fiber Pave. Fiber Pave 3010, which is manufactured by Hercules Incorporated, consists of short-length polypropylene fibers designed for use as a reinforcement in bituminous concrete and asphalt pavements. It is marketed for its ability to increase the cohesive strength of the asphalt binder, improve its work ...

10/13/2026

Title : Fiber Pave, Polypropylene Fiber Creator(s) : Harmelink, Donna S. Corporate Creator(s) : Colorado. Department of Transportation Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 1992-11-01 Report Number : CDOT-DTD-R-92-9 URL : https://rosap.ntl.bts.gov/view/dot/93909
Harmelink, D. S. (1992). Fiber Pave, Polypropylene Fiber (Report No. CDOT-DTD-R-92-9). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93909

Harmelink, Donna S.. Fiber Pave, Polypropylene Fiber. Report no. CDOT-DTD-R-92-9. Colorado. Department of Transportation, 1992. https://rosap.ntl.bts.gov/view/dot/93909.

Harmelink, Donna S. Fiber Pave, Polypropylene Fiber. Colorado. Department of Transportation, 1992, Report no. CDOT-DTD-R-92-9, ROSA P. https://rosap.ntl.bts.gov/view/dot/93909.
Export RIS Citation Information. TY - Tech Report AU - Harmelink, Donna S. A2 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - This report documents the performance of Fiber Pave. Fiber Pave 3010, which is manufactured by Hercules Incorporated, consists of short-length polypropylene fibers designed for use as a reinforcement in bituminous concrete and asphalt pavements. It is marketed for its ability to increase the cohesive strength of the asphalt binder, improve its workability, and extend the service life of the pavement by making it more resistant to shoving, rutting, and thermally induced reflective cracking. It is very difficult to draw any definitive conclusions in terms of overall pavement performance of the Fiber Pave. The test section which contain the fibers and the control section performed equally we ll. Both the cracking and rutting at the end of the evaluation for both the test and control sections were minimal. However, with the thickness of the widened section (4-1/2") it is possible that the three year evaluation was not long enough to fully evaluate the pavement's ability to resist rutting. AN - dot:93909 DA - 1992-11-01 ET - Final Report KW - Asphalt pavements KW - Bituminous binders KW - Concrete pavements KW - Cohesion KW - Fibers KW - Polypropylene KW - Pavement ruts KW - Performance evaluations KW - Reflection cracking KW - Testing KW - Asphalt additives KW - Rutting KW - Cracking KW - Fiber Pave KW - polypropylene fibers LA - English PB - Colorado. Department of Transportation PY - 1992 SN - CDOT-DTD-R-92-9 TI - Fiber Pave, Polypropylene Fiber M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93909 ER -
Importance of Fine Aggregates in Achieving Adequate Skid Resistance in TxDOT Hot Mix Asphalt Mixtures [Project Summary Report]

Abdallah, Imad ;

Khan, Mirza Aamish H.

2026-08-31 | PDF

Pavement friction is a critical roadway-safety property, particularly under wet conditions, yet it is not routinely evaluated during asphalt mixture design. TxDOT's Balanced Mix Design (BMD) process primarily addresses rutting, and cracking. Consequently, a mixture can satisfy conventional performance requirements yet still lose adequate surface fr ...

10/13/2026

Title : Importance of Fine Aggregates in Achieving Adequate Skid Resistance in TxDOT Hot Mix Asphalt Mixtures [Project Summary Report] Creator(s) : Abdallah, Imad;Khan, Mirza Aamish H.;Omole, Adegboyega;Reddy, G. Sandeep;Montoya, Miguel A.;Nazarian, Soheil; Corporate Creator(s) : University of Texas at El Paso. Center for Transportation Infrastructure Systems Corporate Contributor(s) : Texas Department of Transportation. Research and Technology Implementation Office;United States. Department of Transportation. Federal Highway Administration; Published Date : 2026-08-31 Report Number : 0-7108 URL : https://rosap.ntl.bts.gov/view/dot/93908
Abdallah, I., Khan, M. A. H., Omole, A., Reddy, G. S., Montoya, M. A., & Nazarian, S. (2026). Importance of Fine Aggregates in Achieving Adequate Skid Resistance in TxDOT Hot Mix Asphalt Mixtures [Project Summary Report] (Report No. 0-7108). Texas Department of Transportation. Research and Technology Implementation Office. https://rosap.ntl.bts.gov/view/dot/93908

Abdallah, Imad, Mirza Aamish H. Khan, Adegboyega Omole, G. Sandeep Reddy, Miguel A. Montoya, and Soheil Nazarian. Importance of Fine Aggregates in Achieving Adequate Skid Resistance in TxDOT Hot Mix Asphalt Mixtures [Project Summary Report]. Report no. 0-7108. Texas Department of Transportation. Research and Technology Implementation Office, 2026. https://rosap.ntl.bts.gov/view/dot/93908.

Abdallah, Imad, et al. Importance of Fine Aggregates in Achieving Adequate Skid Resistance in TxDOT Hot Mix Asphalt Mixtures [Project Summary Report]. Texas Department of Transportation. Research and Technology Implementation Office, 2026, Report no. 0-7108, ROSA P. https://rosap.ntl.bts.gov/view/dot/93908.
Export RIS Citation Information. TY - Brief AU - Abdallah, Imad AU - Khan, Mirza Aamish H. AU - Omole, Adegboyega AU - Reddy, G. Sandeep AU - Montoya, Miguel A. AU - Nazarian, Soheil A2 - University of Texas at El Paso. Center for Transportation Infrastructure Systems A3 - Texas Department of Transportation. Research and Technology Implementation Office A3 - United States. Department of Transportation. Federal Highway Administration AB - Pavement friction is a critical roadway-safety property, particularly under wet conditions, yet it is not routinely evaluated during asphalt mixture design. TxDOT's Balanced Mix Design (BMD) process primarily addresses rutting, and cracking. Consequently, a mixture can satisfy conventional performance requirements yet still lose adequate surface friction as traffic removes the binder film and polishes the exposed aggregate. Project 0-7108 examined how material, mixture design, and construction variables affect long-term friction and sought a practical way to improve friction without unnecessarily redesigning the entire mixture. The research identified aggregate quality, particularly resistance to polishing, as the dominant factor controlling long-term friction. It therefore focused on determining which aggregate size fractions most strongly influence friction and whether premium, polish resistant aggregate could be concentrated in those fractions while preserving conventional BMD performance. AN - dot:93908 DA - 2026-08-31 ET - Project Summary Report KW - Skid resistance KW - Asphalt tests KW - Performance tests KW - Friction tests KW - Fine aggregates KW - Laboratory tests KW - Air voids KW - Case studies KW - Rutting KW - Asphalt mixtures KW - Literature reviews KW - Asphalt Frictional Performance KW - Dynamic Friction Tester KW - Three-Wheel Polishing Device LA - English PB - Texas Department of Transportation. Research and Technology Implementation Office PY - 2026 SN - 0-7108 TI - Importance of Fine Aggregates in Achieving Adequate Skid Resistance in TxDOT Hot Mix Asphalt Mixtures [Project Summary Report] M3 - Brief N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93908 ER -
Importance of Fine Aggregates in Achieving Adequate Skid Resistance in TxDOT Hot Mix Asphalt Mixtures

Khan, M. Aamish H. ;

Omole, Adegboyega

2026-08-01 | PDF

Skid resistance is a critical roadway-safety characteristic, but it is not routinely evaluated during asphalt mixture design. TxDOT Project 0-7108 evaluated practical methods for improving the long-term frictional performance of hot-mix asphalt mixtures, particularly mixtures containing aggregates with relatively low polishing resistance. The exper ...

10/13/2026

Title : Importance of Fine Aggregates in Achieving Adequate Skid Resistance in TxDOT Hot Mix Asphalt Mixtures Creator(s) : Khan, M. Aamish H.;Omole, Adegboyega;Reddy, G. Sandeep;Montoya, Miguel;Abdallah, Imad;Nazarian, Soheil; Corporate Creator(s) : University of Texas at El Paso. Center for Transportation Infrastructure Systems Corporate Contributor(s) : Texas Department of Transportation. Research and Technology Implementation Office;United States. Department of Transportation. Federal Highway Administration; Published Date : 2026-08-01 Report Number : FHWA/TX-27/0-7108-1 URL : https://rosap.ntl.bts.gov/view/dot/93907
Khan, M. A. H., Omole, A., Reddy, G. S., Montoya, M., Abdallah, I., & Nazarian, S. (2026). Importance of Fine Aggregates in Achieving Adequate Skid Resistance in TxDOT Hot Mix Asphalt Mixtures (Report No. FHWA/TX-27/0-7108-1). Texas Department of Transportation. Research and Technology Implementation Office. https://rosap.ntl.bts.gov/view/dot/93907

Khan, M. Aamish H., Adegboyega Omole, G. Sandeep Reddy, Miguel Montoya, Imad Abdallah, and Soheil Nazarian. Importance of Fine Aggregates in Achieving Adequate Skid Resistance in TxDOT Hot Mix Asphalt Mixtures. Report no. FHWA/TX-27/0-7108-1. Texas Department of Transportation. Research and Technology Implementation Office, 2026. https://rosap.ntl.bts.gov/view/dot/93907.

Khan, M. Aamish H., et al. Importance of Fine Aggregates in Achieving Adequate Skid Resistance in TxDOT Hot Mix Asphalt Mixtures. Texas Department of Transportation. Research and Technology Implementation Office, 2026, Report no. FHWA/TX-27/0-7108-1, ROSA P. https://rosap.ntl.bts.gov/view/dot/93907.
Export RIS Citation Information. TY - Tech Report AU - Khan, M. Aamish H. AU - Omole, Adegboyega AU - Reddy, G. Sandeep AU - Montoya, Miguel AU - Abdallah, Imad AU - Nazarian, Soheil A2 - University of Texas at El Paso. Center for Transportation Infrastructure Systems A3 - Texas Department of Transportation. Research and Technology Implementation Office A3 - United States. Department of Transportation. Federal Highway Administration AB - Skid resistance is a critical roadway-safety characteristic, but it is not routinely evaluated during asphalt mixture design. TxDOT Project 0-7108 evaluated practical methods for improving the long-term frictional performance of hot-mix asphalt mixtures, particularly mixtures containing aggregates with relatively low polishing resistance. The experimental program examined material-related factors (binder grade and aggregate type), mixture-design factors (binder content, aggregate gradation, mixture type, and the distribution of aggregate types within individual gradation fractions), and a construction-related factor (air-void content). Laboratory specimens were polished with the Three-Wheel Polishing Device (TWPD), and friction was measured with the Dynamic Friction Tester (DFT). Field sections and producer mixture designs were also evaluated, and the modified mixtures were checked for rutting, cracking, and moisture-damage performance. Within the materials and ranges evaluated, aggregate type had the dominant effect on long-term friction, whereas binder grade, binder content, overall gradation, mixture type, and air-void content had comparatively small effects after the binder film was removed. Fraction-specific testing showed that the intermediate aggregate fraction-passing the No. 4 sieve and retained on the No. 30 sieve (4.75-0.60 mm)-was especially important. The No. 4-to-No. 16 subfraction (4.75-1.18 mm) provided the largest contribution, while replacing only the material passing the No. 30 sieve provided little benefit. Targeted replacement of low-friction aggregate in the critical fraction improved terminal DFT friction while limiting the quantity of premium aggregate required. Producer case studies increased terminal DFV from0.21 to 0.28 for an SP-C mixture and from 0.25 to 0.32 for an SMA-D mixture without compromising the evaluated mechanical performance. The proposed laboratory friction levels and the approximately 0.30 terminal-DFV screening value should be considered provisional until they are correlated with field friction and validated through implementation projects. AN - dot:93907 DA - 2026-08-01 ET - Final Report - R1B KW - Skid resistance KW - Asphalt tests KW - Performance tests KW - Friction tests KW - Fine aggregates KW - Laboratory tests KW - Air voids KW - Case studies KW - Rutting KW - Asphalt mixtures KW - Literature reviews KW - Asphalt Frictional Performance KW - Dynamic Friction Tester KW - Three-Wheel Polishing Device LA - English PB - Texas Department of Transportation. Research and Technology Implementation Office PY - 2026 SN - FHWA/TX-27/0-7108-1 TI - Importance of Fine Aggregates in Achieving Adequate Skid Resistance in TxDOT Hot Mix Asphalt Mixtures M3 - Tech Report N1 - United States N1 - 0-7108 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93907 ER -
High-Capacity Flexpost Rockfall Fences

Hearn, George

1992-12-01 | PDF

Designs of high-capacity rockfall fences are developed through numerical simulations of rockfall impacts and through a prototype test. Based on the existing design of the Colorado Department of Transportation flexpost fence, three designs at 80,000 ft-lb (108,480 J) rockfall capacity are developed. The three designs provide for fences of 10, 16 and ...

10/13/2026

Title : High-Capacity Flexpost Rockfall Fences Creator(s) : Hearn, George Corporate Creator(s) : University of Colorado Boulder Corporate Contributor(s) : Colorado. Department of Transportation;United States. Department of Transportation. Federal Highway Administration; Published Date : 1992-12-01 Report Number : CDOT-CU-94-13 URL : https://rosap.ntl.bts.gov/view/dot/93906
Hearn, G. (1992). High-Capacity Flexpost Rockfall Fences (Report No. CDOT-CU-94-13). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93906

Hearn, George. High-Capacity Flexpost Rockfall Fences. Report no. CDOT-CU-94-13. Colorado. Department of Transportation, 1992. https://rosap.ntl.bts.gov/view/dot/93906.

Hearn, George High-Capacity Flexpost Rockfall Fences. Colorado. Department of Transportation, 1992, Report no. CDOT-CU-94-13, ROSA P. https://rosap.ntl.bts.gov/view/dot/93906.
Export RIS Citation Information. TY - Tech Report AU - Hearn, George A2 - University of Colorado Boulder A3 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - Designs of high-capacity rockfall fences are developed through numerical simulations of rockfall impacts and through a prototype test. Based on the existing design of the Colorado Department of Transportation flexpost fence, three designs at 80,000 ft-lb (108,480 J) rockfall capacity are developed. The three designs provide for fences of 10, 16 and 24 ft (3.05, 4.88 and 7.32 m) height, and all use steel gabion mesh for fence fabric. A fourth design using steel cable net for fabric on a 10-ft (3.05-m) tall fence was constructed as a full-scale prototype and tested with freely falling boulders. The cable net design has a rockfall capacity of 125,000 ft-lb (169,500 J). A description of flexpost fences, maximum forces in components of fences, sizes of components for the four designs of fences, computer models for numerical simulations, and results of simulations are presented. A summary of prototype tests is presented. A list of suppliers of cable and wire mesh products is provided. AN - dot:93906 DA - 1992-12-01 ET - Final Report KW - Rockfalls KW - Design KW - Gabions KW - Height KW - Prototype tests KW - Simulation KW - Steel wire fabrics KW - Fences KW - Rockfall Fences KW - Rockfall Barriers KW - Rockfall Tests LA - English PB - Colorado. Department of Transportation PY - 1992 SN - CDOT-CU-94-13 TI - High-Capacity Flexpost Rockfall Fences M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93906 ER -
Comparison of Colorado Component Hot Mix Asphalt Materials With Some European Specifications

Aschenbrener, Timothy B.

1992-12-01 | PDF

The purpose of this report is to identify differences in Colorado's aggregates and asphalt cements as measured and compared to some of the European tests and specifications. Performance-related tests for asphalt cements developed by SHRP will be the ultimate method to identify performance and should be well received in Europe. Based upon the standa ...

10/13/2026

Title : Comparison of Colorado Component Hot Mix Asphalt Materials With Some European Specifications Creator(s) : Aschenbrener, Timothy B. Corporate Creator(s) : Colorado. Department of Transportation Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 1992-12-01 Report Number : CDOT-DTD-R-92-14 URL : https://rosap.ntl.bts.gov/view/dot/93905
Aschenbrener, T. B. (1992). Comparison of Colorado Component Hot Mix Asphalt Materials With Some European Specifications (Report No. CDOT-DTD-R-92-14). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93905

Aschenbrener, Timothy B.. Comparison of Colorado Component Hot Mix Asphalt Materials With Some European Specifications. Report no. CDOT-DTD-R-92-14. Colorado. Department of Transportation, 1992. https://rosap.ntl.bts.gov/view/dot/93905.

Aschenbrener, Timothy B. Comparison of Colorado Component Hot Mix Asphalt Materials With Some European Specifications. Colorado. Department of Transportation, 1992, Report no. CDOT-DTD-R-92-14, ROSA P. https://rosap.ntl.bts.gov/view/dot/93905.
Export RIS Citation Information. TY - Tech Report AU - Aschenbrener, Timothy B. A2 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - The purpose of this report is to identify differences in Colorado's aggregates and asphalt cements as measured and compared to some of the European tests and specifications. Performance-related tests for asphalt cements developed by SHRP will be the ultimate method to identify performance and should be well received in Europe. Based upon the standard empirical tests on asphalt cements from four refineries commonly used in Colorado, the asphalt cements are comparable to those used in France. The 17 most frequently used aggregate sources in Colorado were tested for this study. The angularity of fine aggregates is measured with the NAA test procedure. The quality of the P200 is measured with respect to angularity, durability, and stiffening. Angularity of P200 is measured with the stiffening power, durability with the methylene blue and sand equivalent tests, and stiffening with the power of absorption, stiffening power (ring and ball softening point) and Rigden voids index test. The results from these tests are interrelated. -Gradations commonly used by the French and Germans are compared to the CDOT master range. AN - dot:93905 DA - 1992-12-01 ET - Final Report KW - Fine aggregates KW - Angularity KW - Stiffness KW - Sand equivalent test KW - Ratios KW - Hot mix asphalt KW - Specifications KW - Durability KW - Performance tests KW - Asphalt cement KW - fine angularity KW - stiffening power KW - methylene blue KW - power of absorption KW - Rigden voids index KW - P200 to asphalt ratio LA - English PB - Colorado. Department of Transportation PY - 1992 SN - CDOT-DTD-R-92-14 TI - Comparison of Colorado Component Hot Mix Asphalt Materials With Some European Specifications M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93905 ER -
A Case Study of Elastic Concrete Deck Behavior in a Four-Span Prestressed Girder Bridge: Finite Element Analysis

Cao, Li ;

Allen, John H.

1993-01-01 | PDF

The feasibility of eliminating the top mat of steel reinforcement in a concrete bridge deck was investigated using a finite element model. The elimination of the top level of steel is possible because of the flexibility of the girders. Girder deflections reduce the magnitude of maximum tensile and compressive stresses in the transverse directions. ...

10/13/2026

Title : A Case Study of Elastic Concrete Deck Behavior in a Four-Span Prestressed Girder Bridge: Finite Element Analysis Creator(s) : Cao, Li;Allen, John H.;Shing, Benson P.; Corporate Creator(s) : University of Colorado at Boulder. Dept. of Civil, Environmental and Architectural Engineering Corporate Contributor(s) : Colorado. Department of Transportation;United States. Department of Transportation. Federal Highway Administration; Published Date : 1993-01-01 Report Number : CDOT-DTD-CU-93-7 URL : https://rosap.ntl.bts.gov/view/dot/93904
Cao, L., Allen, J. H., & Shing, B. P. (1993). A Case Study of Elastic Concrete Deck Behavior in a Four-Span Prestressed Girder Bridge: Finite Element Analysis (Report No. CDOT-DTD-CU-93-7). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93904

Cao, Li, John H. Allen, and Benson P. Shing. A Case Study of Elastic Concrete Deck Behavior in a Four-Span Prestressed Girder Bridge: Finite Element Analysis. Report no. CDOT-DTD-CU-93-7. Colorado. Department of Transportation, 1993. https://rosap.ntl.bts.gov/view/dot/93904.

Cao, Li, et al. A Case Study of Elastic Concrete Deck Behavior in a Four-Span Prestressed Girder Bridge: Finite Element Analysis. Colorado. Department of Transportation, 1993, Report no. CDOT-DTD-CU-93-7, ROSA P. https://rosap.ntl.bts.gov/view/dot/93904.
Export RIS Citation Information. TY - Tech Report AU - Cao, Li AU - Allen, John H. AU - Shing, Benson P. A2 - University of Colorado at Boulder. Dept. of Civil, Environmental and Architectural Engineering A3 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - The feasibility of eliminating the top mat of steel reinforcement in a concrete bridge deck was investigated using a finite element model. The elimination of the top level of steel is possible because of the flexibility of the girders. Girder deflections reduce the magnitude of maximum tensile and compressive stresses in the transverse directions. It is desirable to eliminate or reduce the amount of steel present in the top of the deck because this steel is subjected to corrosion from deicing chemicals. The deck is supported on precast concrete girders which represents a more severe case than a deck supported on steel girders. A linear elastic finite element model was used to investigate the behavior of the bridge deck when loaded with a 92-kip tandem-axle truck with 24-kip axle weights. The analysis results confirm that the elimination of the top mat of reinforcing steel is feasible. This reinforcement technique is being used in one span of a bridge under construction in early 1993. The test structure has been instrumented with strain gages in the experimental and control sections in order to validate the finite element model. AN - dot:93904 DA - 1993-01-01 ET - Interim Report: 6/92 to 1/93 KW - Bridge decks KW - Corrosion KW - Material reinforcement KW - Strain gages KW - Case studies KW - Prestressed concrete bridges KW - Girder bridges KW - Finite element method LA - English PB - Colorado. Department of Transportation PY - 1993 SN - CDOT-DTD-CU-93-7 TI - A Case Study of Elastic Concrete Deck Behavior in a Four-Span Prestressed Girder Bridge: Finite Element Analysis M3 - Tech Report N1 - United States N1 - DOT92-061 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93904 ER -
Dense Graded Concrete, Project FX(CX)083-1(53)

Ardani, Ahmad

1993-02-01 | PDF

This report describes and compares the performance of a dense graded mix against the traditional standard (gap-graded) mix. The dense graded mixture showed increased compressive strength by approximately ten percent over the gap graded mixture under the controlled laboratory condition. However, similarly prepared mixture in the field showed lower s ...

10/13/2026

Title : Dense Graded Concrete, Project FX(CX)083-1(53) Creator(s) : Ardani, Ahmad Corporate Creator(s) : Colorado. Department of Transportation Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 1993-02-01 Report Number : CDOT-DTD-R-93-1 URL : https://rosap.ntl.bts.gov/view/dot/93903
Ardani, A. (1993). Dense Graded Concrete, Project FX(CX)083-1(53) (Report No. CDOT-DTD-R-93-1). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93903

Ardani, Ahmad. Dense Graded Concrete, Project FX(CX)083-1(53). Report no. CDOT-DTD-R-93-1. Colorado. Department of Transportation, 1993. https://rosap.ntl.bts.gov/view/dot/93903.

Ardani, Ahmad Dense Graded Concrete, Project FX(CX)083-1(53). Colorado. Department of Transportation, 1993, Report no. CDOT-DTD-R-93-1, ROSA P. https://rosap.ntl.bts.gov/view/dot/93903.
Export RIS Citation Information. TY - Tech Report AU - Ardani, Ahmad A2 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - This report describes and compares the performance of a dense graded mix against the traditional standard (gap-graded) mix. The dense graded mixture showed increased compressive strength by approximately ten percent over the gap graded mixture under the controlled laboratory condition. However, similarly prepared mixture in the field showed lower strength. It is the general consensus that the lower strength of the dense graded mix could have been caused by the higher slump (more water) and higher air. The results of the petrographic examination confirmed this phenomenon. Dirty intermittent aggregate may have caused lower strength for the dense mix. The concept of using dense graded mixture in place of the traditional gap graded mixture looks promising. However, there is still room for improvement in a fully implemented paving operation. More research is needed in this area to identify the proper proportioning of aggregate, air entraining admixture, and water cement ratios. AN - dot:93903 DA - 1993-02-01 ET - Final Report KW - Dense graded aggregates KW - Petrography KW - Air content KW - Alternatives analysis KW - Compressive strength KW - Concrete KW - Field tests KW - Gap grading KW - Geological surveying KW - Laboratory tests KW - Performance KW - Slump test KW - Water cement ratio KW - Gap-Graded KW - Petrographic Strength LA - English PB - Colorado. Department of Transportation PY - 1993 SN - CDOT-DTD-R-93-1 TI - Dense Graded Concrete, Project FX(CX)083-1(53) M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93903 ER -
Expert System for Retaining Wall Selection [Phase I]

Adams, Teresa M.

1993-03-01 | PDF

The Bridge Branch of the Colorado Department of Transportation (CDOT) has organized a formal decision process for retaining wall selection (CDOT 1991a; CDOT 1991b). The selection process facilitates implementation of new technologies by encouraging Bridge Branch designers and consultants to consider a range of options when selecting retaining wall ...

10/13/2026

Title : Expert System for Retaining Wall Selection [Phase I] Creator(s) : Adams, Teresa M. Corporate Creator(s) : University of Wisconsin--Madison. Department of Civil and Environmental Engineering Corporate Contributor(s) : Colorado. Department of Transportation;United States. Department of Transportation. Federal Highway Administration; Published Date : 1993-03-01 Report Number : CDOT-DTD-R-93-5 URL : https://rosap.ntl.bts.gov/view/dot/93902
Adams, T. M. (1993). Expert System for Retaining Wall Selection [Phase I] (Report No. CDOT-DTD-R-93-5). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93902

Adams, Teresa M.. Expert System for Retaining Wall Selection [Phase I]. Report no. CDOT-DTD-R-93-5. Colorado. Department of Transportation, 1993. https://rosap.ntl.bts.gov/view/dot/93902.

Adams, Teresa M. Expert System for Retaining Wall Selection [Phase I]. Colorado. Department of Transportation, 1993, Report no. CDOT-DTD-R-93-5, ROSA P. https://rosap.ntl.bts.gov/view/dot/93902.
Export RIS Citation Information. TY - Tech Report AU - Adams, Teresa M. A2 - University of Wisconsin--Madison. Department of Civil and Environmental Engineering A3 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - The Bridge Branch of the Colorado Department of Transportation (CDOT) has organized a formal decision process for retaining wall selection (CDOT 1991a; CDOT 1991b). The selection process facilitates implementation of new technologies by encouraging Bridge Branch designers and consultants to consider a range of options when selecting retaining wall alternatives. The formalized retaining wall selection process puts the CDOT into a national leadership role. What was needed was a computerized implementation of the decision process that would reduce the time required to perform the retaining wall selection process; enforce consistency in decisions made by designers and consultants; and provide a mechanism for the CDOT to encode standard practices and minimum performance criteria within the decision process. The CDOT retaining wall selection process falls into a general pattern of organization that can be automated using currently available expert system technology. Seed money (PHASE I) was provided by the CDOT to develop a conceptual system and design description that implements the CDOT selection process. This investigation has served to evaluate the feasibility and level of difficulty for full system development. The study included considerations for dissemination and program maintenance for a system that runs on IBM-compatible microcomputers. The cost of disseminating run-time versions of the full system were to be minimized. This report comprises the results of the pilot study. AN - dot:93902 DA - 1993-03-01 ET - Final Report KW - Retaining walls KW - Computer aided design KW - Decision making KW - Expert systems KW - Feasibility analysis KW - Microcomputers KW - Materials selection KW - Bridge design KW - Implementation KW - Pilot studies KW - Retaining wall selection, KW - computerized implementation, KW - decision process LA - English PB - Colorado. Department of Transportation PY - 1993 SN - CDOT-DTD-R-93-5 TI - Expert System for Retaining Wall Selection [Phase I] M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93902 ER -
Investigation of the Modified Lottman Test to Predict the Stripping Performance of Pavements in Colorado

Aschenbrener, Timothy B. ;

McGennis, Robert B.

1993-04-01 | PDF

Moisture damage to hot mix asphalt pavements has been a sporadic but persistent problem in Colorado even though laboratory testing is performed to identify moisture susceptible mixtures. The laboratory conditioning was often less severe than the conditioning the hot mix asphalt pavement encountered in the field. Twenty sites of known field performa ...

10/13/2026

Title : Investigation of the Modified Lottman Test to Predict the Stripping Performance of Pavements in Colorado Creator(s) : Aschenbrener, Timothy B.;McGennis, Robert B.; Corporate Creator(s) : Asphalt Institute Corporate Contributor(s) : Colorado. Department of Transportation;United States. Department of Transportation. Federal Highway Administration; Published Date : 1993-04-01 Report Number : CDOT-DTD-R-93-3 URL : https://rosap.ntl.bts.gov/view/dot/93901
Aschenbrener, T. B., & McGennis, R. B. (1993). Investigation of the Modified Lottman Test to Predict the Stripping Performance of Pavements in Colorado (Report No. CDOT-DTD-R-93-3). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93901

Aschenbrener, Timothy B. and Robert B. McGennis. Investigation of the Modified Lottman Test to Predict the Stripping Performance of Pavements in Colorado. Report no. CDOT-DTD-R-93-3. Colorado. Department of Transportation, 1993. https://rosap.ntl.bts.gov/view/dot/93901.

Aschenbrener, Timothy B., and Robert B. McGennis Investigation of the Modified Lottman Test to Predict the Stripping Performance of Pavements in Colorado. Colorado. Department of Transportation, 1993, Report no. CDOT-DTD-R-93-3, ROSA P. https://rosap.ntl.bts.gov/view/dot/93901.
Export RIS Citation Information. TY - Tech Report AU - Aschenbrener, Timothy B. AU - McGennis, Robert B. A2 - Asphalt Institute A3 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - Moisture damage to hot mix asphalt pavements has been a sporadic but persistent problem in Colorado even though laboratory testing is performed to identify moisture susceptible mixtures. The laboratory conditioning was often less severe than the conditioning the hot mix asphalt pavement encountered in the field. Twenty sites of known field performance with respect to moisture susceptibility, both acceptable and unacceptable, were identified. Materials from these sites were tested using seven versions of the modified Lottman test (AASHTO T 283) and the boiling water test (ASTM D 3624). For modified Lottman testing, two levels of severity for conditioning laboratory samples were identified that correlated well with conditions in the field. For mixtures placed under high traffic, high temperatures, high moisture, and possibly freeze, the severe laboratory conditioning defined in the report should be used. The milder laboratory conditioning defined in this report is appropriate for low traffic sites. AN - dot:93901 DA - 1993-04-01 ET - Final Report KW - Pavement stripping KW - Case studies KW - Boiling point KW - Moisture content KW - Asphalt pavements KW - Hot mix asphalt KW - Performance KW - Modified Lottman test KW - Moisture Susceptibility LA - English PB - Colorado. Department of Transportation PY - 1993 SN - CDOT-DTD-R-93-3 TI - Investigation of the Modified Lottman Test to Predict the Stripping Performance of Pavements in Colorado M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93901 ER -
Analytical Simulation of Rockfall Prevention Fence Structures

Mustoe, G.G.W. ;

Huttelmaier, H. P.

1993-04-01 | PDF

The work performed during this contract included the following tasks: (i) the development of a novel numerical model for the dynamic simulation of a rockfall prevention fence using the descrete element method (DEM), (ii) the numerical implementation of the DEM numerical model in a computer code to be used by engineers at CDOT, and (iii) demonstrati ...

10/13/2026

Title : Analytical Simulation of Rockfall Prevention Fence Structures Creator(s) : Mustoe, G.G.W.;Huttelmaier, H. P.; Corporate Creator(s) : Colorado School of Mines Corporate Contributor(s) : Colorado. Department of Transportation;United States. Department of Transportation. Federal Highway Administration; Published Date : 1993-04-01 Report Number : CDOT-CSM-R-93-20 URL : https://rosap.ntl.bts.gov/view/dot/93900
Mustoe, G., & Huttelmaier, H. P. (1993). Analytical Simulation of Rockfall Prevention Fence Structures (Report No. CDOT-CSM-R-93-20). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93900

Mustoe, G.G.W. and H. P. Huttelmaier. Analytical Simulation of Rockfall Prevention Fence Structures. Report no. CDOT-CSM-R-93-20. Colorado. Department of Transportation, 1993. https://rosap.ntl.bts.gov/view/dot/93900.

Mustoe, G.G.W., and H. P. Huttelmaier Analytical Simulation of Rockfall Prevention Fence Structures. Colorado. Department of Transportation, 1993, Report no. CDOT-CSM-R-93-20, ROSA P. https://rosap.ntl.bts.gov/view/dot/93900.
Export RIS Citation Information. TY - Tech Report AU - Mustoe, G.G.W. AU - Huttelmaier, H. P. A2 - Colorado School of Mines A3 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - The work performed during this contract included the following tasks: (i) the development of a novel numerical model for the dynamic simulation of a rockfall prevention fence using the descrete element method (DEM), (ii) the numerical implementation of the DEM numerical model in a computer code to be used by engineers at CDOT, and (iii) demonstration and validation of the DEM computer technique to simulate rockfall impacts against rockfall fences. The original DEM numerical model was designed to analyze flexible rockfall prevention fences that were comprised of a single layer of columnar attenuators. In an additional research task funded under this contract the DEM model was extended to deal with fences with two layers of attenuators. AN - dot:93900 DA - 1993-04-01 ET - Final Report KW - Rockfalls KW - Discrete element method KW - Crash cushions KW - Discrete systems KW - Fences KW - Mathematical models KW - Simulation KW - Structural analysis KW - Validation KW - Rockfall Prevention Rockfall Structures LA - English PB - Colorado. Department of Transportation PY - 1993 SN - CDOT-CSM-R-93-20 TI - Analytical Simulation of Rockfall Prevention Fence Structures M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93900 ER -
Crack Reduction, Pavement Reinforcement Glasgrid

Harmelink, Donna S.

1993-04-01 | PDF

The main objective of this study was to evaluate the effectiveness of Glasgrid as a reflective crack reducing method. Two locations were selected for evaluation. The first location was on I-70, west of the Eisenhower Memorial Tunnel. At this location the section containing the Glasgrid was evaluated and compared to an equivalent section containing ...

10/13/2026

Title : Crack Reduction, Pavement Reinforcement Glasgrid Creator(s) : Harmelink, Donna S. Corporate Creator(s) : Colorado. Department of Transportation Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 1993-04-01 Report Number : CDOT-DTD-R-93-6 URL : https://rosap.ntl.bts.gov/view/dot/93899
Harmelink, D. S. (1993). Crack Reduction, Pavement Reinforcement Glasgrid (Report No. CDOT-DTD-R-93-6). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93899

Harmelink, Donna S.. Crack Reduction, Pavement Reinforcement Glasgrid. Report no. CDOT-DTD-R-93-6. Colorado. Department of Transportation, 1993. https://rosap.ntl.bts.gov/view/dot/93899.

Harmelink, Donna S. Crack Reduction, Pavement Reinforcement Glasgrid. Colorado. Department of Transportation, 1993, Report no. CDOT-DTD-R-93-6, ROSA P. https://rosap.ntl.bts.gov/view/dot/93899.
Export RIS Citation Information. TY - Tech Report AU - Harmelink, Donna S. A2 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - The main objective of this study was to evaluate the effectiveness of Glasgrid as a reflective crack reducing method. Two locations were selected for evaluation. The first location was on I-70, west of the Eisenhower Memorial Tunnel. At this location the section containing the Glasgrid was evaluated and compared to an equivalent section containing the material (Trevira Spunbond) and an untreated section. The second location was on U.S. 40, east of Hayden. On this project the Glasgrid was placed at two locations. At the first location the Glasgrid was placed over a railroad crossing which was no longer in use. The remainder of the Glasgrid was placed over the construction joint where the pavement was wider. Following the four year evaluation the pavement in the Glasgrid section has a significant more amount of cracking in the wheel paths than the Trevira and untreated sections. Most of the longitudinal cracking in the wheel path has deteriorated into alligator cracking. Neither of the other two sections are showing any signs of this type of distress. Cracking in the Glasgrid section is appearing at a much faster rate than cracking in the Trevira and untreated sections. As of the final evaluation the U.S. 40 east of Hayden location shows no evidence of reflective cracking at the construction joint. This includes both the untreated and treated areas. The Glasgrid over the railroad tracks did not prevent reflective cracking. The overlay and Glasgrid was removed and the railroad tracks were restored. Based on findings from this study, it is not recommended to use Glasgrid as a crack-reduction treatment without further data supporting its effectiveness. AN - dot:93899 DA - 1993-04-01 ET - Final Report KW - Fabrics KW - Crash injuries KW - Longitudinal cracking KW - Performance evaluations KW - Prevention KW - Recommendations KW - Reflection cracking KW - crack reduction KW - Glasgrid KW - Trevira LA - English PB - Colorado. Department of Transportation PY - 1993 SN - CDOT-DTD-R-93-6 TI - Crack Reduction, Pavement Reinforcement Glasgrid M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93899 ER -
Ice Detection and Highway Weather Information Systems, FHWA Experimental Project No. 13

Woodham, Dave

1993-05-01 | PDF

This evaluation consisted of interviews with SCAN system users and evaluations of the manpower and material savings associated with the use of the system. It appears that use of a road weather information system can reduce the amount of deicing materials used as well as reduce overtime labor costs. Anecdotal information suggests that there have bee ...

10/13/2026

Title : Ice Detection and Highway Weather Information Systems, FHWA Experimental Project No. 13 Creator(s) : Woodham, Dave Corporate Creator(s) : Colorado. Department of Transportation Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 1993-05-01 Report Number : CDOT-DID-R-93-10 URL : https://rosap.ntl.bts.gov/view/dot/93898
Woodham, D. (1993). Ice Detection and Highway Weather Information Systems, FHWA Experimental Project No. 13 (Report No. CDOT-DID-R-93-10). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93898

Woodham, Dave. Ice Detection and Highway Weather Information Systems, FHWA Experimental Project No. 13. Report no. CDOT-DID-R-93-10. Colorado. Department of Transportation, 1993. https://rosap.ntl.bts.gov/view/dot/93898.

Woodham, Dave Ice Detection and Highway Weather Information Systems, FHWA Experimental Project No. 13. Colorado. Department of Transportation, 1993, Report no. CDOT-DID-R-93-10, ROSA P. https://rosap.ntl.bts.gov/view/dot/93898.
Export RIS Citation Information. TY - Tech Report AU - Woodham, Dave A2 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - This evaluation consisted of interviews with SCAN system users and evaluations of the manpower and material savings associated with the use of the system. It appears that use of a road weather information system can reduce the amount of deicing materials used as well as reduce overtime labor costs. Anecdotal information suggests that there have been fewer winter accidents after the instrumentation was installed at one site. AN - dot:93898 DA - 1993-05-01 ET - Final Report: 9/89 to 2/93 KW - Bridge decks KW - Icing KW - Detection and identification KW - Winter maintenance KW - Road weather information systems KW - Evaluation KW - bridge deck icing KW - ice detection LA - English PB - Colorado. Department of Transportation PY - 1993 SN - CDOT-DID-R-93-10 TI - Ice Detection and Highway Weather Information Systems, FHWA Experimental Project No. 13 M3 - Tech Report N1 - United States N1 - DTFH71-89-513-CO-19 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93898 ER -
Rehabilitation of Rutted Asphalt Pavements, Project IR-25-3(96)

Ardani, Ahmad

1993-05-01 | PDF

This report describes the testing, construction, and 5 years of performance evaluations of a rehabilitated rutted asphalt pavement. The primary objective of this study was to investigate the effectiveness of a 2-in. high stability overlay topped with a plant-mixed seal coat (PMSC) in alleviating the rutting distress on I-25 north of Denver in Color ...

10/13/2026

Title : Rehabilitation of Rutted Asphalt Pavements, Project IR-25-3(96) Creator(s) : Ardani, Ahmad Corporate Creator(s) : Colorado. Department of Transportation Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 1993-05-01 Report Number : CDOT-DTD-R-93-8 URL : https://rosap.ntl.bts.gov/view/dot/93897
Ardani, A. (1993). Rehabilitation of Rutted Asphalt Pavements, Project IR-25-3(96) (Report No. CDOT-DTD-R-93-8). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93897

Ardani, Ahmad. Rehabilitation of Rutted Asphalt Pavements, Project IR-25-3(96). Report no. CDOT-DTD-R-93-8. Colorado. Department of Transportation, 1993. https://rosap.ntl.bts.gov/view/dot/93897.

Ardani, Ahmad Rehabilitation of Rutted Asphalt Pavements, Project IR-25-3(96). Colorado. Department of Transportation, 1993, Report no. CDOT-DTD-R-93-8, ROSA P. https://rosap.ntl.bts.gov/view/dot/93897.
Export RIS Citation Information. TY - Tech Report AU - Ardani, Ahmad A2 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - This report describes the testing, construction, and 5 years of performance evaluations of a rehabilitated rutted asphalt pavement. The primary objective of this study was to investigate the effectiveness of a 2-in. high stability overlay topped with a plant-mixed seal coat (PMSC) in alleviating the rutting distress on I-25 north of Denver in Colorado. The following is a brief description of some of the findings: High-stability asphalt is not resistant to rutting, and rutting is returning to the rehabilitated southbound lanes, but at a slower rate than the standard mix. A preconstruction examination of the existing pavement indicated that the top mat makes the greatest contribution to the total rutting. The results of laboratory tests were largely inconclusive. No correlations were found between the measured rutting and pavement parameters such as stability, asphalt content, gradations, voids, etc. AN - dot:93897 DA - 1993-05-01 ET - Final Report KW - Rutting KW - Pavement overlays KW - Asphalt pavements KW - Driver rehabilitation KW - Measures of effectiveness KW - Seal coats KW - Performance evaluations KW - Laboratory tests KW - High-stability KW - Gradation LA - English PB - Colorado. Department of Transportation PY - 1993 SN - CDOT-DTD-R-93-8 TI - Rehabilitation of Rutted Asphalt Pavements, Project IR-25-3(96) M3 - Tech Report N1 - United States N1 - 11.075 1571P DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93897 ER -
Comparison of 1992 Colorado Hot Mix Asphalt With Some European Specifications

Aschenbrener, Timothy B.

1993-06-01 | PDF

Sixteen hot mix asphalt designs placed during 1992 in Colorado were tested with the standard CDOT test methods, the French rutting tester, the Hamburg wheel-tracking device, and the Georgia loaded-wheel tester. Hot mix asphalt was designed with the Texas gyratory compactor. These mixtures are very resistant to rutting. Some improvements need to be ...

10/13/2026

Title : Comparison of 1992 Colorado Hot Mix Asphalt With Some European Specifications Creator(s) : Aschenbrener, Timothy B. Corporate Creator(s) : Colorado. Department of Transportation Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 1993-06-01 Report Number : CDOT-DID-R-93-11 URL : https://rosap.ntl.bts.gov/view/dot/93896
Aschenbrener, T. B. (1993). Comparison of 1992 Colorado Hot Mix Asphalt With Some European Specifications (Report No. CDOT-DID-R-93-11). Colorado. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/93896

Aschenbrener, Timothy B.. Comparison of 1992 Colorado Hot Mix Asphalt With Some European Specifications. Report no. CDOT-DID-R-93-11. Colorado. Department of Transportation, 1993. https://rosap.ntl.bts.gov/view/dot/93896.

Aschenbrener, Timothy B. Comparison of 1992 Colorado Hot Mix Asphalt With Some European Specifications. Colorado. Department of Transportation, 1993, Report no. CDOT-DID-R-93-11, ROSA P. https://rosap.ntl.bts.gov/view/dot/93896.
Export RIS Citation Information. TY - Tech Report AU - Aschenbrener, Timothy B. A2 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - Sixteen hot mix asphalt designs placed during 1992 in Colorado were tested with the standard CDOT test methods, the French rutting tester, the Hamburg wheel-tracking device, and the Georgia loaded-wheel tester. Hot mix asphalt was designed with the Texas gyratory compactor. These mixtures are very resistant to rutting. Some improvements need to be made to the mixtures to resist moisture damage. AN - dot:93896 DA - 1993-06-01 ET - Final Report KW - Alternatives analysis KW - Compactors KW - Hot mix asphalt KW - Loss and damage KW - Mix design KW - Moisture damage KW - Rutting KW - Technology KW - Test procedures KW - Testing equipment KW - Gyratory testing machines KW - French rutting tester KW - Hamburg wheel-tracking device KW - Georgia loaded wheel tester LA - English PB - Colorado. Department of Transportation PY - 1993 SN - CDOT-DID-R-93-11 TI - Comparison of 1992 Colorado Hot Mix Asphalt With Some European Specifications M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93896 ER -
Simple for Dead, Continuous for Live Load Steel Superstructures [Research Summary]

Derner, Jon

2026-09-01 | PDF

The Missouri Department of Transportation (MoDOT) is using a bridge design method known as Simple for Dead Load, Continuous for Live Load (SDCL) on several steel bridges in Missouri. In this method, steel beams are designed to act as simple spans while the concrete deck is being built and then act more like a continuous bridge after the concrete ha ...

10/13/2026

Title : Simple for Dead, Continuous for Live Load Steel Superstructures [Research Summary] Creator(s) : Derner, Jon Corporate Creator(s) : Horner & Shifrin, Inc.;University of Missouri--Columbia; Corporate Contributor(s) : Missouri. Department of Transportation. Construction and Materials Division;United States. Department of Transportation. Federal Highway Administration; Contributor(s) : Hosey, Jenni Published Date : 2026-09-01 Report Number : cmr26-011 URL : https://rosap.ntl.bts.gov/view/dot/93895
Derner, J. (2026). Simple for Dead, Continuous for Live Load Steel Superstructures [Research Summary] (Report No. cmr26-011). Missouri. Department of Transportation. Construction and Materials Division. https://rosap.ntl.bts.gov/view/dot/93895

Derner, Jon. Simple for Dead, Continuous for Live Load Steel Superstructures [Research Summary]. Report no. cmr26-011. Missouri. Department of Transportation. Construction and Materials Division, 2026. https://rosap.ntl.bts.gov/view/dot/93895.

Derner, Jon Simple for Dead, Continuous for Live Load Steel Superstructures [Research Summary]. Missouri. Department of Transportation. Construction and Materials Division, 2026, Report no. cmr26-011, ROSA P. https://rosap.ntl.bts.gov/view/dot/93895.
Export RIS Citation Information. TY - Brief AU - Derner, Jon A2 - Horner & Shifrin, Inc. A2 - University of Missouri--Columbia A3 - Missouri. Department of Transportation. Construction and Materials Division A3 - United States. Department of Transportation. Federal Highway Administration AB - The Missouri Department of Transportation (MoDOT) is using a bridge design method known as Simple for Dead Load, Continuous for Live Load (SDCL) on several steel bridges in Missouri. In this method, steel beams are designed to act as simple spans while the concrete deck is being built and then act more like a continuous bridge after the concrete has hardened. MoDOT currently has approximately 55 bridges in its inventory using this design method, including 50 constructed as part of Design-Build bridge bundles. To validate the EPG procedures, the research team reviewed the literature to develop an understanding of critical issues, materials, and other DOT guidance and experience, policies, developed details, and past research results. The review showed that formal design provisions for SDCL steel bridges are limited, with only a few states mentioning SDCL or similar concepts. Previous research showed that, after the bridge is complete, slab reinforcement in tension and steel connection blocks in compression were the main contributors to the negative flexural resistance. Previous studies also showed that some continuity can develop during construction. AN - dot:93895 DA - 2026-09-01 ET - Research Summary KW - Static loads KW - Finite element method KW - Bridges KW - Design methods KW - Guidelines KW - Steel structures KW - Literature reviews KW - Field tests KW - Bridge construction KW - Bridge decks KW - Steel bridges KW - SDCL bridge KW - degree of continuity KW - compression block KW - bridge testing KW - design guidelines LA - English PB - Missouri. Department of Transportation. Construction and Materials Division PY - 2026 SN - cmr26-011 TI - Simple for Dead, Continuous for Live Load Steel Superstructures [Research Summary] M3 - Brief N1 - United States N1 - TR202505 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/93895 ER -

Previous Page Previous

141 - 160 / 527

Next Page Next

Found an issue?

Send us an email at: publishinghd@cdc.gov