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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 34681 - 34700 of 35440 results
  • Report on pollution abatement on highway construction and maintenance
    Report on pollution abatement on highway construction and maintenance.
    Dillard, J. H ;
    Sherwood, W. Cullen
    1970-01-01 | PDF
    No Description
  • Effect of some aggregate characteristics on the fatigue behavior of an asphaltic concrete mixture
    Effect of some aggregate characteristics on the fatigue behavior of an asphaltic concrete mixture.
    Maupin, G. W
    1970-01-01 | PDF
    The effect of aggregate characteristics on the fatigue behavior of asphaltic mixtures was investigated by utilizing a laboratory constant deflection, flexural fatigue test. Coarse aggregate characteristics such as surface texture, rugosity, and flakiness index, were evaluated and attempts were made to correlate these with fatigue behavior. Since pr ...
  • Installation and performance of lightweight aggregate asphaltic concrete test sections
    Installation and performance of lightweight aggregate asphaltic concrete test sections.
    Maupin, G. W
    1970-01-01 | PDF
    In 1966 and 1968 test sections of asphaltic concrete overlays fabricated with coarse lightweight aggregate and fine limestone were installed in the Roanoke-Bedford area. The experimental mixes used were designed in an attempt to develop skid resistant surface mixes for use in predominantly limestone areas. The mixes incorporated 20%-45% of lightwei ...
  • Potentially reactive carbonate rocks a review of Virginia reports
    Potentially reactive carbonate rocks : a review of Virginia reports.
    Sherwood, W. Cullen ;
    Newlon, Howard
    1970-01-01 | PDF
    No Description
  • A report on Virginia specifications for penetration asphalt cements
    A report on Virginia specifications for penetration asphalt cements.
    Vaswani, Nari K ;
    Hughes, Charles S
    1970-01-01 | PDF
    Asphaltic pavements in Virginia had shown cracks in the surface layers only, and this had led to the belief that the durability properties of the asphalt had not been what they should have been and that the asphalt specifications needed to be revised. Recommendations from the study were incorporated in Department specifications.
  • Evaluation of several types of curing and protective materials for concrete final report on part II installation report and initial condition survey of bridge decks
    Evaluation of several types of curing and protective materials for concrete : final report on part II : installation report and initial condition survey of bridge decks.
    Newlon, Howard
    1970-01-01 | PDF
    Thirty-nine test panels were installed on three interstate bridges to evaluate several combinations of curing and protective treatments for concrete. Panels were cured with white pigmented liquid membrane and white polyethylene, both with and without subsequent treatments using linseed oil. One panel received a chlorinated rubber sealer marketed as ...
  • Evaluation of several types of curing and protective materials for concrete final report on part I laboratory and outdoor exposure studies preliminary to field trials
    Evaluation of several types of curing and protective materials for concrete : final report on part I : laboratory and outdoor exposure studies preliminary to field trials.
    Newlon, Howard
    1970-01-01 | PDF
    Concern for improving the durability of concrete has focused renewed attention on all aspects of concrete technology. Numerous proprietary products which are claimed to improve durability have been marketed as protective coatings, curing agents or combinations of the two. The end purpose of this project is to evaluate the performance of several of ...
  • A laboratory experiment in evaluating means of imparting a harsh texture to portland cement concrete surfaces
    A laboratory experiment in evaluating means of imparting a harsh texture to portland cement concrete surfaces.
    Ozyildirim, H. Celik
    1970-01-01 | PDF
    The purpose of this study was to explore methods of obtaining a rough, durable texture on test slabs fabricated in the laboratory in an attempt to provide high skid resistance. The exploration involved the investigation of types of texture, time of texturing, and the effects of coarse aggregates and curing methods.
  • Louisiana slabjacking study
    Louisiana slabjacking study.
    Higgins, C. M. ;
    Kinchen, Richard W.
    1970-01-01 | PDF
    This study was oriented toward slabjacking procedures for raising slabs and filling voids on roadways, with emphasis on louisiana materials and equipment. The conclusions were: (1) holes should be about 1 1/4 inches in diameter, spaced 6 feet apart and no closer than 18 inches to edges or joints, (2) a slurry mix made up of 4 bags of cement per cub ...
  • Evaluation of the use of antistripping additives in asphaltic concrete mixtures
    Evaluation of the use of antistripping additives in asphaltic concrete mixtures.
    Arena, Philip J. ;
    Ashby, J. T.
    1970-01-01 | PDF
    stripping is not a major problem in Louisiana. However there has been isolated instances of stripping occurring within the state and this study was initiated to ascertain if antistripping additives would have any benefical effect in combating stripping.A preliminary laboratory investigation was conducted on seven different commercially avilable add ...
  • Quantitative evaluation of optically induced disorientation
    Quantitative evaluation of optically induced disorientation.
    Brecher, M. Herbert ;
    Brecher, Gerhard A.
    1970-01-01 | PDF
    The purpose of this study was to establish quantitatively and systematically the association between the speed of movement of an optical environment and the extent of disorientation experienced by an individual viewing this environment. The degree of disorientation was determined by measuring the angle by which an individual deviates from a straigh ...
  • Studies on the storage stability of human blood cholinesterases I
    Studies on the storage stability of human blood cholinesterases : I.
    Crane, Charles R. ;
    Sanders, Donald C.
    1970-01-01 | PDF
    Whole blood, red cell, and plasma preparations were stored at room temperature, refrigerated, and frozen. Samples were assayed over a 50-day period using the technique of constant-pH titration (pH-Stat). At least 90% of the cholinesterase activity in the whole blood and plasma preparations was retained for 6 days at room temperature and over 6 week ...
  • Effects of an organophosphorus pesticide on reproduction in the rat
    Effects of an organophosphorus pesticide on reproduction in the rat.
    Ryan, Leonard C. ;
    Endecott, Boyd R.
    1970-01-01 | PDF
    The toxic effects of organophosphorus insecticides are commonly ascribed to cholinesterase (CHE) inhibition. A search of the scientific literature revealed the well-established fact that a number of chlorinated pesticides adversely affect reproduction in mice and rats.However, little is known about the effects of organophosphorus pesticides on repr ...
  • Tolerances to thermal extremes in aerospace activities
    Tolerances to thermal extremes in aerospace activities.
    Iampietro, P.F.
    1970-01-01 | PDF
    Tolerance for all hot environments cannot be defined by a single criterion. At least three types of tolerance are discussed which might occur in aerospace activities. The tolerance categories have been designated (1) pain limited, (2) heat storage limited and (3) systems limited. Pain limited exposures are of short duration and require very high te ...
  • Special Examination in Lieu of Drydocking for Large Mobile Drilling Units
    Special Examination in Lieu of Drydocking for Large Mobile Drilling Units
    United States. Coast Guard
    1969-12-12 | PDF
    To set forth procedures to be used when conducting an examination in lieu of drydocking on large drilling units.
  • A DiscreteElement Method of Analysis for Combined Bending and Shear Deformation of a Beam
    A Discrete-Element Method of Analysis for Combined Bending and Shear Deformation of a Beam
    Tankersley, David F. ;
    Dawkins, William P.
    1969-12-01 | PDF
    A method of analysis for the combined effects of bending and shear deformations is presented. Although the method is primarily designed for the analysis of beams, it can be applied to other structural problems. The method is applicable to beams that have abrupt, or point-by-point, variations in their structural properties. Also, the beam may be sub ...
  • Evaluation of an Emergency Call Box System
    Evaluation of an Emergency Call Box System
    Goolsby, Merrell E. ;
    McCasland, William R.
    1969-12-01 | PDF
    A four-button (police, ambulance, fire, service) emergency radio call box system was installed by the Texas Highway Department on an eleven-mile section of 145 in Houston. This report evaluates the system in terms of usage, maintenance, driver acceptance, service offered, and cost effectiveness. Stopped vehicle studies were conducted to determine t ...
  • Concrete probestrength study final report
    Concrete probe-strength study : final report.
    Law, Sheldon M. ;
    Burt, W. T.
    1969-12-01 | PDF
    The Windsor probe - test system was evaluated for determining compressive strength of concrete by comparing probe strengths against cylinder and core strengths from both laboratory and field-poured concrete. Advantages and disadvantages of this system were of prime consideration while cost and efficiency were also taken into account. The probe test ...
  • Fidelity of simulation and transfer of training a review of the problem
    Fidelity of simulation and transfer of training : a review of the problem.
    Gerathewohl, Siegfried J.
    1969-12-01 | PDF
    The document is concerned with the several kinds of flight simulators available today which are valuable tools for research, training and proficiency determination. They range from simple trainer type devices, which are useful for the learning of specific tasks, to very sophisticated ground-based facilities and aircraft used for crew training under ...
  • FiredClay Aggregates for Use in Flexible Bases
    Fired-Clay Aggregates for Use in Flexible Bases
    Moore, William M.
    1969-11-01 | PDF
    This is a progress report on Phase 2 of a study entitled "Synthetic Aggregate Research" being conducted by the Texas Transportation Institute. This phase deals specifically with synthetic aggregates for use in flexible base, and its primary objective is to develop acceptance criteria for such aggregates. It was initiated in 1966, after non-bloated, ...
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