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Showing 33261 - 33280 of 36747 results
  • Survey of Bridge Decks with GroundPenetration Radar A Manual
    Survey of Bridge Decks with Ground-Penetration Radar: A Manual
    Clemeña, Gerardo G.
    1985-01-01 | PDF
    The report presents the findings of a study of the feasibility of locating audio-teleconferencing equipment in the residency offices of the Department. As an extension of a larger study documented in entry 11-45, teleconferencing units were installed in six residency offices in the Salem District to determine whether the Department's teleconferenci ...
  • An evaluation of thirteen local selective enforcement projects designed to reduce drunken driving in Virginia
    An evaluation of thirteen local selective enforcement projects designed to reduce drunken driving in Virginia.
    Lynn, Cheryl
    1985-01-01 | PDF
    In accordance with federal requirements, the effectiveness of thirteen locally based DUI selective enforcement projects funded with grants from the National Highway Traffic Safety Administration was evaluated. The grants were awarded in the FY 1982 grant period. In the study, projects found to have met their goals for reducing alcohol related crash ...
  • Research notes research project concludes latex modified fibrous concrete not recommended for present use
    Research notes : research project concludes latex modified fibrous concrete not recommended for present use.
    Oregon State Highway Division. Research Section
    1985-01-01 | PDF
    Research was conducted on four Oregon bridges overlayed with Latex Modified Fibrous Concrete (LMFC) in 1981. Problems immediately arose on the first overlay project while trying to finish the deck. The tining process tended to pull and tear the steel fibers on the surface, producing a rough and unpleasant ride. Concrete grinding was required to mak ...
  • Mandatory seat belt use laws
    Mandatory seat belt use laws.
    Grey, Joseph
    1985-01-01 | PDF
    The purposes of this study were to review mandatory seat belt use laws as they have been used around the world, to forecast the impact of such a law in Virginia, and, if appropriate, to propose a mandatory seat belt law for inclusion in the Code of Virginia. This report consists of a review of the literature on mandatory seat belt laws, an analysis ...
  • Tests for early acceptance of concrete
    Tests for early acceptance of concrete.
    Halstead, Woodrow J ;
    Ozyildirim, H. Celik
    1985-01-01 | PDF
    A literature survey and limited study of laboratory concretes were conducted to evaluate various methods for predicting concrete strengths at 28 days based on procedures for accelerated strength development or measurement of strength of normally cured specimens at early ages. A review of the literature was also made to assess the usefulness of proc ...
  • Evaluation of concrete patching materials final report
    Evaluation of concrete patching materials : final report.
    Wyant, David C
    1985-01-01 | PDF
    The project evaluated numerous repairs on portland cement concrete pavements and bridge decks made with a number of laboratory accepted, proprietary patching materials and portland cement concrete mixtures of different designs. It was ascertained that in the majority of cases when the patches failed, the failure resulted from the use of improper co ...
  • Application of teleconferencing within the Virginia Department of Highways Transportation
    Application of teleconferencing within the Virginia Department of Highways & Transportation.
    Perfater, Michael A
    1985-01-01 | PDF
    The report presents the findings of a study of the feasibility of using audio teleconferencing in administrative and technical functions of the Virginia Department of Highways and Transportation. The study was, for the most part, an evaluation of 26 audio teleconferences conducted over a one-year period. These teleconferences employed newly purchas ...
  • An Experimental Investigation of the Discharge of a Flashing Liquid From a Finite Reservoir A Fundamental Study of the TwoPhase Flow Phenomena Occurring During Venting From Rail Tank Cars
    An Experimental Investigation of the Discharge of a Flashing Liquid From a Finite Reservoir: A Fundamental Study of the Two-Phase Flow Phenomena Occurring During Venting From Rail Tank Cars
    Rod, S. R. ;
    Guhler, M.
    1985-01-01 | PDF
    The design of pressure relief valves for railroad tank cars containing pressurized liquid commodities is dependent on knowledge of venting rates during accidents. In turn, development of an appropriate theoretical model requires knowledge of many properties which affect the venting rates of vapor, liquid and two-phase mixtures. Previous reports and ...
  • Field study of a pedestrian bridge of reinforced plastic
    Field study of a pedestrian bridge of reinforced plastic.
    McCormick, Fred C
    1985-01-01 | PDF
    A discussion of the behavior of the superstructure of a pedestrian bridge fabricated with glass-reinforced plastic under a field load test is presented. Experimental measurements of elastic vertical deflections were 1.8 times greater than those predicted by means of a finite element solution. A live load of 4.0 times the dead load of the superstruc ...
  • Evaluation of signal timing and coordination procedures
    Evaluation of signal timing and coordination procedures.
    Arnold, E. D
    1985-01-01 | PDF
    Based on a review of available literature, recommended procedures for timing the various types of signals are provided. Specifically, procedures are included for both pretimed and vehicle-actuated controllers located at isolated intersections and at intersections in a signal system. Simplicity and ease of use are emphasized as the targeted users ar ...
  • State demonstration project loop detectors
    State demonstration project : loop detectors.
    Arnold, E. D ;
    Munn, G. L
    1985-01-01 | PDF
    The Virginia Department of Highways and Transportation frequently utilizes induction loops in its vehicle detector systems. Although not documented, there have been many instances of loop failure; therefore, the practices and materials used by the Department in installing loop detectors were investigated. Two field tests were initially undertaken-- ...
  • Evaluation of hydraulic cement concretes containing slag added at the mixer
    Evaluation of hydraulic cement concretes containing slag added at the mixer.
    Ozyildirim, H. Celik ;
    Walker, Hollis N
    1985-01-01 | PDF
    The study evaluated the effect of ground, granulated, iron slags on the properties of hydraulic cement concretes such as normally used in highway construction. Two cements with different alkali contents and two slags with different activity indices, 100 and 120, were used. Slags were used as replacements for portions of Portland cement at 40%, 50%, ...
  • Deflection Testing and Its Application to Pavement Rehabilitation in Alaska
    Deflection Testing and Its Application to Pavement Rehabilitation in Alaska
    McHattie, Robert L.
    1985-01-01 | PDF
    Considering the need to operate Alaska's paved highway system at the lowest possible long term cost, it has become necessary to constantly rebalance the economics of continued maintenance versus reconstruction versus rehabilitation alternatives on all existing pavement structures. Such economic analyses require rational methods for estimating remai ...
  • Rubber modified asphalt mix
    Rubber modified asphalt mix.
    Hughes, Charles S
    1985-01-01 | PDF
    This report summarizes the design and field installation of an asphalt mix containing up to 3.0% closed cell rubber by weight of the mix. The performance is discussed as well as possible reasons for the early failure of the mix. Suggestions are made for avoiding failures if it is decided to use rubber modified mixes in the future.
  • Virginia ridesharing statistics methodologies for determining carpooler and vanpool average life bases and the average fuel economy of commuter vehicles
    Virginia ridesharing statistics : methodologies for determining carpooler and vanpool average life bases and the average fuel economy of commuter vehicles.
    Kittell, Howard J
    1985-01-01 | PDF
    The objective of this research was to investigate methods of computing average life values for carpoolers and vanpools in Virginia. These statistics are to be used by the Rail and Public Transportation Division in evaluating the efficiency and cost-effectiveness of the ridesharing programs it funds. Achievement of this objective required a means of ...
  • Evaluation of deck durability on continuous beam highway bridges
    Evaluation of deck durability on continuous beam highway bridges.
    McKeel, Wallace T
    1985-01-01 | PDF
    In an effort to determine the extent of deck cracking on continuous steel beam bridges and the effect of the cracking on deck durability, 137 structures were visually inspected and 5 of these were selected for detailed evaluation. The general survey disclosed widespread transverse cracking throughout the lengths of the continuous beam sections in b ...
  • Methodology for the placement of maintenance area headquarters
    Methodology for the placement of maintenance area headquarters.
    Wyant, David C
    1985-01-01 | PDF
    A methodology for strategically locating Virginia Department of Highways and Transportation maintenance area headquarters throughout the state was developed and pilot tested in the Charlottesville Residency (Albemarle and Greene counties). In the developmental phase, many parameters and work load indicators were examined for their effect on the opt ...
  • An evaluation of solar energy for heating a highway maintenance headquarters building
    An evaluation of solar energy for heating a highway maintenance headquarters building.
    Hilton, Marvin H
    1985-01-01 | PDF
    A highway maintenance area headquarters building having overall dimensions of 64 ft - 8 in by 42 ft - 0 in was equipped with an active solar heating system to assist in heating space and domestic hot water. The solar system was instrumented and its operation monitored for a 15-month period. An evaluation of the data collected indicated that the sol ...
  • Proposed revisions to the DMV external driver history transcript
    Proposed revisions to the DMV external driver history transcript.
    McQuade, Terrence
    1985-01-01 | PDF
    The Division of Motor Vehicles, Transportation Safety Administration (formerly Virginia Department of Transportation Safety) awarded a grant to the Virginia Highway and Transportation Research Council to investigate the problems experienced by those who utilize Virginia's driver history transcripts and to formulate a new physical format for the tra ...
  • Final report robotics in construction
    Final report, robotics in construction.
    Zuk, William
    1985-01-01 | PDF
    The use of programmable robots for various kinds of repetitive and hazardous jobs in manufacturing industries is well established. However, their use for other tasks, as in construction, is still in a developmental stage, but is growing rapidly. Described in this report are current developments in robotics related to construction, both in this coun ...
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