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The US Transportation Collection consists of documents from across all transportation modes with specific focus on research reports from US DOT, state DOTs, and other transportation organizations. Bookmark this collection: https://rosap.ntl.bts.gov/collection_ust or https://doi.org/10.21949/1530857.

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Showing 6661 - 6680 of 36104 results
  • Evaluation of Shelf Life in PostTensioning Grouts
    Evaluation of Shelf Life in Post-Tensioning Grouts
    Torres, Eduardo ;
    Aguirre, Marcelino
    2018-08-01 | PDF
    Post-tensioning (PT) grout is commonly used in post-tensioned bridge girders to create a bond between the prestressing strands in the tendon and the surrounding concrete; it also provides corrosion protection to the prestressing strands. In recent years, however, soft grout has been found in several bridges in Florida and around the world. Soft gro ...
  • Distribution and Habitat Association of the Northern Longeared Bat
    Distribution and Habitat Association of the Northern Long-eared Bat
    Warren, Zachary A
    2018-08-01 | PDF
    Because of white-nose syndrome, the northern long-eared bat (Myotis septentrionalis) is experiencing rapid population declines across the majority of its range. This decline has prompted increased regulatory protection and thus an increased need for effective habitat management strategies. Insight into the species habitat associations, however, is ...
  • A White Paper on Artificial Intelligence Big Data in Transportation
    A White Paper on Artificial Intelligence & Big Data in Transportation
    Fong, Amy ;
    Arredondo, David
    2018-08-01 | PDF
    Advances in computing techniques and processing capacity as well as increased data collection are beginning to enable artificial intelligence applications in a myriad real-world setting. Artificial intelligence (AI) algorithms at their most advanced can provide decision support, ease labor-intensive operations, perform predictive analysis, and info ...
  • Safety Evaluation of Roundabouts in Georgia
    Safety Evaluation of Roundabouts in Georgia
    Guin, Angshuman ;
    Rodgers, Michael O.
    2018-08-01 | PDF
    Several previous studies have documented significant safety benefits of roundabouts in the United Sates. However, the safety benefits for a given roundabout may vary depending on factors such as the familiarity of the driving population to roundabout operation, site-specific geometric features, weather conditions, etc. To help inform GDOT’s roundab ...
  • The Influence of Pile Shape and Pile Sleeves on Lateral Load Resistance in Sand
    The Influence of Pile Shape and Pile Sleeves on Lateral Load Resistance in Sand
    Rollins, Kyle M. ;
    Russell, Dalin N
    2018-08-01 | PDF
    The lateral resistance of pile foundations is typically based on the performance of circular piles even though other pile types are used. Due to lack of data there is a certain level of uncertainty when designing pile foundations other than circular piles for lateral loading. Theoretical analyses have suggested that square sections will have more l ...
  • WSDOT Foundation and Fill Settlement Case Histories
    WSDOT Foundation and Fill Settlement Case Histories
    Allen, Tony M.
    2018-08-01 | PDF
    Estimation of settlement below foundations and embankment fills is a routine geotechnical design requirement. A couple of settlement estimation methods are typically used for this purpose nationally and at WSDOT. These include the Hough and Schmertmann methods. This report provides a summary of these methods, and an assessment of their accuracy thr ...
  • Evaluating the Success of Meeting Design Objectives on Previously Constructed OOS Stream Stability Projects
    Evaluating the Success of Meeting Design Objectives on Previously Constructed OOS Stream Stability Projects
    Johnson, Peggy A. ;
    Carroll, Samuel N.
    2018-08-01 | PDF
    The ability to detect failure or impending failure of a stream stabilization project or its components is important to assuring that the bridge will be protected during high flow events. The objectives of this project were to assess the degrees of success of stream channel transition designs through bridge reaches and the suitability of these proje ...
    Supporting Files
  • Investigation of Flow and Local Scour Characteristics Around Permeable WSDOT Dolotimber Engineered Logjams ELJ
    Investigation of Flow and Local Scour Characteristics Around Permeable WSDOT Dolotimber Engineered Logjams (ELJ)
    Papanicolaou, A.N. Thanos ;
    Wyssmann, Micah A
    2018-08-01 | PDF
    Engineered logjams (ELJs) are permeable flow deflection structures that project out from the streambank and are used to stabilize streambanks, protect roadways, and improve aquatic habitat. Dolotimber ELJs are constructed from interlocking large woody material and concrete dolo components to provide optimal performance in terms of structural stabil ...
  • Pack Rust Identification and Mitigation Strategies for Steel Bridges
    Pack Rust Identification and Mitigation Strategies for Steel Bridges
    Patel, Chintan Hitesh ;
    Bowman, Mark D.
    2018-08-01 | PDF
    Pack rust or crevice corrosion is a type of localized corrosion. When a metal is in contact with a metal, or even non-metal, the metal starts to corrode, and rust starts to pack in between the surfaces. When significant development of pack rust occurs, it can cause overstressing of bolts and rivets causing them to fail, and it can bend connecting p ...
  • Seismic Performance of Integral Abutment Highway Bridges in Illinois
    Seismic Performance of Integral Abutment Highway Bridges in Illinois
    LaFave, James M. ;
    Fahnestock, Larry
    2018-08-01 | PDF
    The seismic behavior of integral abutment bridges (IABs) is of particular interest in southern Illinois, where proximity to the New Madrid Seismic Zone may create significant ground motion accelerations during an earthquake. IABs are common in modern bridge construction due to their lack of expansion joints between the superstructure and abutment, ...
  • Reliability of FEQDrain for Modeling Performance of Sand Treated With Large Diameter Prefabricated Vertical Drains for Liquefaction Mitigation
    Reliability of FEQDrain for Modeling Performance of Sand Treated With Large Diameter Prefabricated Vertical Drains for Liquefaction Mitigation
    Rollins, Kyle M. ;
    Meservy, Travis H
    2018-08-01 | PDF
    The objective of the modeling in this study was to evaluate the reliability of the axisymmetric finite element computer program FEQDrain for computing excess pore pressure ratios (Ru) and settlement at sand sites treated with prefabricated vertical drains (PVDs). FEQDrain was found to be capable of successfully modeling measured excess pore pressur ...
  • Application Rate Adjustments for Seal Coats in Texas
    Application Rate Adjustments for Seal Coats in Texas
    Goehl, Darlene ;
    Gurganus, Charles
    2018-08-01 | PDF
    Seal coats are a very important preventive maintenance method used throughout Texas. Through the preventive maintenance program, about 16,000 lane miles a year are routinely resurfaced with a seal coat by contracts and about 3,000 lane miles per year of seal coats are placed with state forces. Additionally, seal coats are used in intermediate layer ...
  • Product Evaluation Tracking Tools and Product Categories
    Product Evaluation Tracking Tools and Product Categories
    Smithwick, Jake ;
    Mayo, Glenda
    2018-08-01 | PDF
    State transportation agencies (STAs) implement countless transportation products, identified, evaluated, and accepted through a Product Evaluation Program (PEP). Through an effective PEP, STAs can ensure the continuous availability of high performance products to be used on various construction and maintenance projects. STAs are encouraged to const ...
  • Evaluation of Different Paint Systems for OverCoating Existing Structural Steel
    Evaluation of Different Paint Systems for Over-Coating Existing Structural Steel
    Balaguru, Perumalsamy ;
    Najm, Husam
    2018-08-01 | PDF
    The project was undertaken to identify a procedure to accept new coating systems for over-coating of steel surfaces. The practices used by various state transportation agencies, and test methods for accelerated testing of coatings with primary focus on ASTM and FHWA guidelines were reviewed. It was concluded that a new protocol for accepting new sy ...
  • Development of Calcined Clays as Pozzolanic Additions in Portland Cement Concrete Mixtures
    Development of Calcined Clays as Pozzolanic Additions in Portland Cement Concrete Mixtures
    Zayed, Abla ;
    Shanahan, Natallia
    2018-08-01 | PDF
    A number of clay sources in the state of Florida were characterized in this study. It was determined that field material contains a substantial portion of sand, approximately 65-80%, which needs to be beneficially processed before the material can be used as a pozzolan. The clay fraction met the chemical oxide composition requirements of ASTM C618. ...
  • Lateral Resistance of Pipe Piles Adjacent to a 20FT High MSE Wall
    Lateral Resistance of Pipe Piles Adjacent to a 20-FT High MSE Wall
    Rollins, Kyle M. ;
    Besendorfer, Jason J.
    2018-08-01 | PDF
    A 20-foot tall Mechanically Stabilized Earth (MSE) retaining wall was constructed, and piles were driven at various distances behind the wall. Lateral pile load tests were conducted in the direction of the wall, and the performance of the pile, wall, and reinforcement were measured. The piles were 12.75-inch diameter pipe piles. One half of the wal ...
  • Effect of Service Temperature on Joint Removal in Steel Bridges
    Effect of Service Temperature on Joint Removal in Steel Bridges
    Mahmoud, Hussam ;
    Atadero, Rebecca Anne
    2018-08-01 | PDF
    Bridge expansion joints are a particularly troublesome component of bridges and many departments of transportation (DOTs) are looking for a solution to deteriorating expansion joints on highway bridges. Bridge expansion joints create a break in the structural continuity of a bridge, allowing clogging gravels and corroding chlorides to enter. They a ...
  • Risk and Failure Resilience of Interdependent Transportation Systems
    Risk and Failure Resilience of Interdependent Transportation Systems
    Wang, Pingfeng ;
    Krishnan, Krishna
    2018-08-01 | PDF
    This study explores the gap between quantitative and qualitative assessment of engineering resilience in the domain of complex transportation infrastructure systems. A conceptual framework was developed for modeling engineering resilience, and then a Bayesian network was employed as a quantitative tool for the assessment and analysis of engineering ...
  • Development of Performance Curves for Composite Pavements in PMS
    Development of Performance Curves for Composite Pavements in PMS
    Chen, Don ;
    Nicholas II, Thomas
    2018-08-01 | PDF
    Due to their high performance, composite pavements have been used by highway agencies as a cost-effective alternative for high traffic volume roadways. In the North Carolina Department of Transportation (NCDOT) Pavement Management System (PMS), however, a function to allow engineers to select the composite pavement as the optimal pavement alternati ...
  • Passive Wireless Sensors for Monitoring Behavior of Recycled Aggregate Concrete
    Passive Wireless Sensors for Monitoring Behavior of Recycled Aggregate Concrete
    Lange, David A.
    2018-08-01 | PDF
    This project studied the feasibility of applying new RFID technology – particularly passive tag technology, to infrastructure projects that incorporate recycled concrete aggregates. Our goals were to advance the technology for passive RFID wireless system for embedment in concrete to monitor the behavior of the material under loading, and other str ...
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