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.
The purpose of this study was to investigate various set retarding admixtures for possible use as an economical method of allowing long delay periods between the mixing of cement, soil and water and remixing. Three types of retarders were used in preliminary tests, from which one, a sugar and lime combination, was chosen for all further work. The s
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The Troxler Model 2226 asphalt content gauge was evaluated in the laboratory and taken into the field where its results were compared to conventional reflux values. The precision as evaluated in the laboratory was found to be excellent - equivalent to .06% asphalt content with a 45 second count. The gauge does have to be recalibrated each time a di
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This report summarizes discussions at the Eno Foundation's Board of Consultants conference on April 28, 1970. Actions, problems and solutions were presented for three major topic areas: legislative trends for highways, airports and transit; environmental design and the design team concept; and improving public information, especially increasing the
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In 1903, New York City Police Commissioner William McAdoo introduced what was perhaps the first modern speed enforcement technique. As described in "Traffic is a Monster,"' "The system, put to work along the Hudson drives, consisted of three dummy tree trunks set up at one-mile intervals along the roadside. A policeman equipped with a stopwatch and
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A procedure is developed for analysis of two-way floor slabs subjected to different concentrated load patterns and continuous over many supports. Partitioning methods are presented which are simple and direct in application. A particular two-way slab structure planned by the Texas Highway Department was chosen for demonstration of results obtained
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Ten model tests of drilled shaft footings subjected to dynamic overturning loads were performed. Compared to the average size footing used for minor service structures in Texas, the model footings were reduced by a factor of six. The footing reactions were investigated in a cohesionless sand, a laboratory sandy clay, and a laboratory clayey sand. T
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Fifteen asphaltic concrete and seventeen portland cement concrete pavements located in Virginia were chosen for studies of aggregate wear and related wet pavement friction. Coarse aggregates from thirteen different geologic formations and quarry sources had been utilized in construction of the pavements. Field measurements of wet friction and pavem
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Through a literature study, approximately fifty methods of measuring moisture were investigated to ascertain a suitable method for use in measuring moisture changes in 6 inch by 12 inch concrete cylinders cured by the autogenous accelerated curing method. The resistance method was selected and the Bouyoucos moisture gage was evaluated in the labora
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Major Findings: Construction of the Interstate System in Virginia has served as a catalyst to: 1. Create 22,705-more manufacturing jobs during the period 1961-1968. 2. Contribute 69,475 more employment opportunities-in the non-manufacturing sector. 3. Generate $2,471,266,000 in additional personal income as a result of increased manufacturing and n
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Distribution Characteristics of Materials: Ten bituminous distributors and ten chip spreading operations were investigated the former by cotton pad, cup, and trough tests; the latter by measuring the distance covered by a truckload and by placing pans in the road to catch the stone. A wide variation was found in the coverage consistency of the dist
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Several aspects of the stripping and whip off characteristics of typical Virginia surface treatment materials were investigated. Sixty different binder-aggregate combinations were tested with the AASHO Designation T182-57 stripping test, a plate immersion stripping test, and a centrifuge whip off test, the last two of which were recently devised by
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This study investigated a liquid, enzymatic, proprietary product, Paczyme, to determine if it could be used effectively and economically as a soil stabilizer in highway construction. Specific objectives were sought to prove or disprove the claims of the company that produces Paczyme, the Larutan Corporation. The specific objectives included the det
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In this investigation, the optimum structural strength contributed by a material to the overall strength of the pavement was studied for cases applicable to Virginia. The variables were (a) the modulus of elasticity or the thickness equivalency of the material, (b) the thickness of the material in the layer, (c) the location of the material with re
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This report describes the results to date in a limited study, including laboratory tests and field evaluations, of the suitability of bituminized fiber pipe for use as highway culverts. Crushing strength data obtained from three-edge bearing tests indicate that bituminized fiber culverts, as currently produced, are not as strong as, and should not
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