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 paper provides information that angular acceleration tests of the vestibular system transcend clinical caloric tests in revealing adaptation to angular accelerations as experienced in rotary motions, including flight situations. The caloric test is definitely not a substitute for angular acceleration tests. The vestibular system is the system p
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The scope of this research study was to extend the knowledge gained from previous studies on the durability of structural lightweight concrete, and to attempt to correlate (a) degree of pre-wetting of the synthetic lightweight coarse aggregate, (b) type of synthetic light: weight coarse aggregate, (c) compressive strength of lightweight concrete an
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The primary objective of this study was to evaluate the gyratory kneading compactor and to investigate the possibilities and capabilities of this type of equipment.Curves were developed for six different asphaltic concrete mixes with varying compactive efforts and asphalt contents. These curves indicated that a wide range of compactive efforts can
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This report describes a laboratory research program on the durability of lightweight concrete. Two phases of a three phase study are covered by this report, while the remaining phase is still under study. The two phases being reported are Phase II - Wetting and Drying Tests of Lightweight Concrete and Phase III - Freezing and Thawing Tests of Light
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Thirty-seven different materials and combinations of materials were impacted with an instrumented dummy head at 15 ft/sec and at 30 ft/sec. Peak g forces, rise times, and deceleration durations were determined for both impact velocities on each test specimen and compared to base line impacts on the rigid base structure to determine the degree of en
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This report includes the laboratory evaluation of lightweight aggregates from seven sources, six in Texas and one in Louisiana. Two of these materials have beer field tested on an extensive scale, although the field evaluations reported herein are limited to one source of material.
This paper presents the operational aspects of the merging control equipment in use at the Telephone Road interchange on the inbound Gulf Freeway. The equipment is being used to evaluate several control theories but has not been installed for a period of time sufficient to allow a report on the comparison of theories at this time. This comparison o
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The prime objective of this study was to investigate the accident frequency on the inbound section of the Gulf Freeway before the entrance ramps were controlled and then evaluate the effectiveness of ramp control in reducing the frequency of rear-end accidents as a result of the improved level of service on the facility.
This edition (November 1966) of the User's Manual is indicated for use with program library tape Version II of 15 November 1966. As programs are modified, new pages for this manual will be prepared as necessary and distributed with subsequent library program tapes. All revised and additional pages will have the revision (issue) date in the upper le
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Twenty-one, four-inch cores were taken from seven locations on the bridge deck. Each core was subjected to visual and low magnification examination, load deformation determinations and impact hammer readings. Thin sections were made from cores from each location and studied under the petrographic microscope. Some of the larger pieces of aggregate w
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This is the third and last report on the Quality Control Analysis of highway construction materials.It deals with the statistical evaluation of data from several construction projects to determine the basic pattern of variability with respect to slump of concrete and concrete aggregates.The analysis indicated 1) that the frequency distribution of m
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