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.
A general method for the solution of large, sparsely banded, positive-definite, coefficient matrices is presented. The goal in developing the method was to produce an efficient and reliable solution process and to provide the user-programmer with a package which is problem-independent, efficient, and easy to use, so that program development time ca
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This manual describes a new method developed by the author, based on ASTM Method D2901, for determining the cement content of freshly mixed soil cement. The manual contains information on apparatus, reagents, procedures, source of equipment and reagents, forms, and a sampling plan.
The hydraulic performance of steep sloped circular culverts was investigated experimentally using 18-inch diameter corrugated metal and concrete pipe culvert models of different geometrical configurations. One of the effect means found to dissipate the energy of supercritical flows in steep culverts was to force a hydraulic jump to form inside of t
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Design of portland cement concrete pavements is a complex procedure involving the evaluation and analysis of numerous variables. A wide variety of variables within the broad categories of loads, environments, material properties, maintenance, progressive failure, and economics must be considered in an ideal design procedure. Concrete pavement and o
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Seasonal variations in the strength of flexible pavements are known to influence their service life, especially in the northern United States and Canada. Less is known regarding seasonal effects in a milder climate such as that of Texas. This study was undertaken in an attempt to determine where and when, in Texas, such variations exist, what their
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Texas Transportation Institute. Texas A&M University
1971-01-01
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These data comprise bills of materials, photographs and drawings describing the Delamination Detector developed in Research Study Number 2-18-68-130 by the Texas Transportation Institute, Texas A&M University in cooperation with the Texas Highway Department. This study was sponsored jointly by the Texas Highway Department and the Department of Tran
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1971-01-01
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U.S. Department of Transportation Annual Reports
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Submitted in compliance of Section 11 of the Department of Transportation Act, the fourth annual report of the Department of Transportation deals with the Department's achievements during Fiscal Year 1970.
Eighteen different concrete mixtures were proportioned to investigate the influence of cement types (II and III), water cement ratios (0.4, 0.5, and 0.6), and admixtures (accelerator, retarder, and air entraining agent) on the moisture changes during autogenous curing of concrete cylinders. A total of 360 concrete cylinders were made comprising aut
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Forty-eight different concrete mixes were designed to investigate the influence of cement types (II, III, and V), cement contents (450, 550, and 650 lb. per cu. yd.), water-cement ratios (0.4, 0.5, and 0.6), admixtures (accelerator, retarder, and air entraining agent), and initial mixture temperatures (50°F, 70°F, and 90°F) on the strengths of auto
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Concomitant with the Research Council's studies of accelerated curing for strength testing, Subcommittee II-i of ASTM Committee C-9 was developing and refining accelerated methods for standardization. This development included a cooperative testing program in which nine U. S. and Canadian laboratories, including the Research Council, applied variou
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Forty-eight different concrete mixes were designed to investigate the influence of cement types (II, III, and V), cement contents (450, 550, and 650 lb. per cu. yd.), water cement ratios (0.4, 0.5, and 0.6), admixtures (accelerator, retarder, and air entraining agent), and initial mixture temperatures (50°F, 70°F, and 90°F) on the temperature devel
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The Safety Section of the Virginia Highway Research. Council carried out observation tests of the legibility and visibility of reflectorized and enamel license plates. The primary objectives were to determine the comparative legibility and visibility distances of these plates under low beam headlights and from several angles of approach. Fifteen su
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The joint sealing materials and the rigid pavement joint sealing practices employed by Virginia and other highway agencies were studied. The studies showed that Virginia's sealant and joint designs were in need of updating and that higher quality poured sealants as well as preformed sealants could be used to advantage.
With respect to those statutory factors bearing on the severity of the sentence (fine, jail sentence, and license revocation), it was concluded that the Virginia Code authorized sanctions that, if consistently imposed, would make the penalty for driving while intoxicated one of the more severe in the nation. On the other hand, the state appeared to
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Much research to eliminate driver confusion at high-speed interchanges is being directed toward the application of diagrammatic signing. In this study, one conventional sign on the westbound approach to Exit No. 1 of the Capital Beltway was replaced by a diagrammatic sign to determine the effect of the new sign on driver behavior. Before and after
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