Four-ft. by 5-ft. by 6-inch (1.2m x 1.5m x 0.15m) reinforced concrete slabs were fabricated, cured and subjected to 7 years of daily salting at an outdoor exposure yard. Subsequently, the slabs were modified and instrumented to allow direct measurement of the corrosion current flowing between the top and bottom mats of reinforcing steel and other c
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This user’s manual contains guidance to State and local agencies for developing and implementing a highway safety improvement program which best suits their capabilities and needs. The manual should be beneficial to State and local highway engineers and other professionals involved in the highway safety improvement program.
United States. Department of Transportation. Office of the Secretary of Transportation
1981-11-01
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This report has been prepared in fulfillment of the legislative mandate set forth in Section 123(c) of the Surface Transportation Assistance Act of 1978 (STAA), as follows: (c) Not later than January 1 of the second calendar year which begins after the date of enactment of this section and each calendar year thereafter the Secretary shall submit to
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This Procedural Guide describes procedures for evaluating highway safety programs and projects. It should be beneficial to State and local engineers and other professionals involved in evaluation.
Reduction of skidding accidents is an ongoing objective of the highway community. Since skid resistance depends, in part, on the frictional characteristics of the pavements surface, improvements in pavement friction are constantly sought. In order to have adequate wet-weather friction, a pavement must have surface relief or texture. This texture ma
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Road profiles are of interest because they affect vehicle ride quality, the wavelengths of concern ranging from 1/2 to 300 feet (0.2 to 90 m). This report pertains to a class of profile-measuring instruments in which an accelerometer measures vertical vehicle motion and a "noncontact" sensor measures vertical pavement motion-either displacement or
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Road profiles are of interest because they affect vehicle ride quality, the wavelengths of concern ranging from 1/2 to 300 feet (0.2 to 90 m). This report pertains to a class of profile-measuring instruments in which an accelerometer measures vertical vehicle motion and a "noncontact" sensor measures vertical pavement motion-either displacement or
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This study reviewed the placement of mass concrete under water using a tremie. Areas investigated included (a) Mixture design of tremie concrete including the use of pozzolanic replacement of portions of the cement; (b) Flow patterns and flow related characteristics of tremie-placed concrete; (c) Heat development and associated cracking problems fo
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In the context of this Handbook, roadway delineation is defined as a system of devices and or/markings--excluding signs and signals--that regulate, warn, or provide tracking information and guidance to the driver. Intended primarily for use by various levels of design, traffic, and maintenance engineering personnel, the Roadway Delineation Practice
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Stream Channel Degradation and Aggradation; Design Inferences for Pile Groups; Role of Computer Graphics in Realtime Traffic Control Systems; Wet Weather Accidents and Pavement Skid Resistance; The Future of Traffic Simulation
This report presents methods by which urbanized areas can develop and implement integrated traffic counting programs to serve the volume data needs of all agencies. Methods for estimating volume at a single location, volume across a cordonline or cutline, VMT within a corridor or other small area, and regional VMT are presented. Sound statistical s
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Through a cooperative program between the Bureau of Mines, Tuscaloosa Research Center and the Federal Highway Administration, synthetic ceramic aggregates having high wear- and polish-resistance were developed. Three hundred aggregate compositions, incorporating a variety of low-cost "waste" materials were evaluated over a 3D-month period. Aggregat
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The use of impregnation as a means of improving the wear resistance of natural aggregates was investigated. A series of tests were conducted using four aggregates of varying quality, selected from a sampling of 40 different aggregates. Tests performed to evaluate the effect of impregnation on the physical, mechanical) wear resistance and polish res
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This report evaluates the drainage on some 25 viaduct type structures. The maintenance problems are discussed and methods of reducing the plugging of the drains are suggested. Recommendations are made for design specifications to significantly reduce future maintenance costs from drain plugging.
This report describes a program to develop an automatic distance gauging system for use in a device (CMD) for monitoring the consolidation of a portland cement concrete pavement. The capacitive distance gauging system measures the air gap between the surface of the pavement and the bottom of a gamma backscatter instrument for density monitoring. Th
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Techniques have been developed for determination of the permeability of a variety of concretes to chloride ions in a relatively rapid period of time. The most promising method involves application of d.c. voltage in the range of 60.0-80.0 volts for 6-hours to either a section of a reinforced concrete bridge deck or a core taken from a concrete stru
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