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Showing 35981 - 36000 of 36747 results
  • A DiscreteElement Method of MultipleLoading Analysis for TwoWay Bridge Floor Slabs
    A Discrete-Element Method of Multiple-Loading Analysis for Two-Way Bridge Floor Slabs
    Panak, John J. ;
    Matlock, Hudson
    1970-01-01 | PDF
    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 ...
  • Study of bituminous surface treatments in Virginia analysis of factors that significantly influence the quality of bituminous surface treatments
    Study of bituminous surface treatments in Virginia : analysis of factors that significantly influence the quality of bituminous surface treatments.
    Runkle, Stephen N ;
    Mahone, David C
    1970-01-01 | PDF
    It is obvious that many variables may influence the quality of a surface treatment, but the relative importance of the many variables involved is a matter of conjecture. The purpose of this study was to define those variables which do significantly influence the quality of surface treatments in Virginia and to determine the acceptable limits for th ...
  • Water bath accelerated curing of concrete
    Water bath accelerated curing of concrete.
    McGhee, Kenneth H
    1970-01-01 | PDF
    Water bath methods for accelerating the strength development of portland cement concrete were investigated in a two phase study as follows. Phase I - Participation in a cooperative accelerated strength testing program sponsored by the American Society for Testing and Materials. The three methods studied consisted of; (1) curing immediately after ca ...
  • Dynamic Overturning Loads on Drilled Shaft Footings Used for Minor Service Structures
    Dynamic Overturning Loads on Drilled Shaft Footings Used for Minor Service Structures
    Smith, Harry L. ;
    Dunlap, Wayne A.
    1970-01-01 | PDF
    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 ...
  • Reactions in Portland cementclay mixtures final report
    Reactions in Portland cement-clay mixtures : final report.
    Noble, David F ;
    Plaster, Rodger W
    1970-01-01 | PDF
    This study was an extension of earlier work by Sherwood and Noble to determine the nature of the clay content of common Virginia soils and the strength development of those soils in cement mixtures. In addition attempts were made (1) to study the relationship between parent materials and their derived soils, (2) to determine any changes in physical ...
  • Report on the 1970 Board of Consultants Conference
    Report on the 1970 Board of Consultants Conference
    Eno Foundation for Transportation
    1970-01-01 | PDF
    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 ...
  • Development and fabrication of the Virginia skidresistance measurement vehicle model 2
    Development and fabrication of the Virginia skid-resistance measurement vehicle (model 2).
    Cook, Larry M ;
    Dancy, William H
    1970-01-01 | PDF
    The inefficiency of the Virginia Highway Research Council, Model 1, skid measurement trailer, and the increasing effort expended by the American Society for Testing and Materials toward the development of more stringent specifications for pavement skid-resistance measurement vehicles made it imperative that the Virginia Highway Research Council obt ...
  • Evaluation of a nuclear asphalt content gage final report
    Evaluation of a nuclear asphalt content gage : final report.
    Hughes, Charles S
    1970 | PDF
    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 ...
  • Pavement design and performance studies progress report no 4 on phase A performance study of typical Virginia pavements
    Pavement design and performance studies : progress report no. 4 on phase A, performance study of typical Virginia pavements.
    McGhee, Kenneth H
    1970-01-01 | PDF
    The performance of in-service typical Virginia flexible and rigid pavements in all areas of the state is under evaluation. The objectives are to provide a ready reference for designers and field engineers and to provide background information for design improvement. Periodic deflection and roughness tests are conducted along with field inspections. ...
  • Benefits of Interstate Highways 1970
    Benefits of Interstate Highways (1970)
    United States. Federal Highway Administration
    1970-01-01 | PDF
    No Description
  • Barstow Santa Fes Modern Oasis
    Barstow— Santa Fe's Modern Oasis
    The Atchison, Topeka & Santa Fe Railway Company
    1970-01-01 | PDF
    Brochure describing Santa Fe Railway's new facility and railroad operations in Barstow, CA.
  • Special Examination in Lieu of Drydocking for Large Mobile Drilling Units
    Special Examination in Lieu of Drydocking for Large Mobile Drilling Units
    United States. Coast Guard
    1969-12-12 | PDF
    To set forth procedures to be used when conducting an examination in lieu of drydocking on large drilling units.
  • Fidelity of simulation and transfer of training a review of the problem
    Fidelity of simulation and transfer of training : a review of the problem.
    Gerathewohl, Siegfried J.
    1969-12-01 | PDF
    The document is concerned with the several kinds of flight simulators available today which are valuable tools for research, training and proficiency determination. They range from simple trainer type devices, which are useful for the learning of specific tasks, to very sophisticated ground-based facilities and aircraft used for crew training under ...
  • A DiscreteElement Method of Analysis for Combined Bending and Shear Deformation of a Beam
    A Discrete-Element Method of Analysis for Combined Bending and Shear Deformation of a Beam
    Tankersley, David F. ;
    Dawkins, William P.
    1969-12-01 | PDF
    A method of analysis for the combined effects of bending and shear deformations is presented. Although the method is primarily designed for the analysis of beams, it can be applied to other structural problems. The method is applicable to beams that have abrupt, or point-by-point, variations in their structural properties. Also, the beam may be sub ...
  • Concrete probestrength study final report
    Concrete probe-strength study : final report.
    Law, Sheldon M. ;
    Burt, W. T.
    1969-12-01 | PDF
    The Windsor probe - test system was evaluated for determining compressive strength of concrete by comparing probe strengths against cylinder and core strengths from both laboratory and field-poured concrete. Advantages and disadvantages of this system were of prime consideration while cost and efficiency were also taken into account. The probe test ...
  • Evaluation of an Emergency Call Box System
    Evaluation of an Emergency Call Box System
    Goolsby, Merrell E. ;
    McCasland, William R.
    1969-12-01 | PDF
    A four-button (police, ambulance, fire, service) emergency radio call box system was installed by the Texas Highway Department on an eleven-mile section of 145 in Houston. This report evaluates the system in terms of usage, maintenance, driver acceptance, service offered, and cost effectiveness. Stopped vehicle studies were conducted to determine t ...
  • Studies of the Thermal Transformation of Synthetic Aggregates Produced in a Rotary Kiln
    Studies of the Thermal Transformation of Synthetic Aggregates Produced in a Rotary Kiln
    Houston, James T. ;
    Blank, Horace R.
    1969-11-01 | PDF
    The wide variations found in the properties of synthetic aggregates made from clay-type materials may be due in large part to differences in the degree of thermal transformation of their constituents resulting from processing in rotary kilns. In order to study this problem, two different clays were processed in a research rotary kiln under differen ...
  • Determination of centers of gravity of infants
    Determination of centers of gravity of infants.
    Swearingen, J.J. ;
    Badgley, J.M.
    1969-11-01 | PDF
    Recent efforts to provide effective restraint equipment for crash protection of infants in our transportation complex and to develop satisfactory flotation equipment for the little ones have revealed that there is a lack of data concerning the location of the c.g. (center of gravity) of this age group. This study was undertaken to fill this gap. Va ...
  • Motor effects from visually induced disorientation in man
    Motor effects from visually induced disorientation in man.
    Brecher, M. Herbert ;
    Brecher, Gerhard, A.
    1969-11-01 | PDF
    The problem of disorientation in a moving optical environment was examined. Egocentric disorientation can be experienced by a pilot if the entire visual environment moves relative to his body without a clue of the objective position of the airplane in respect to the ground. A simple method of measuring disorientation was devised. In this method cha ...
  • FiredClay Aggregates for Use in Flexible Bases
    Fired-Clay Aggregates for Use in Flexible Bases
    Moore, William M.
    1969-11-01 | PDF
    This is a progress report on Phase 2 of a study entitled "Synthetic Aggregate Research" being conducted by the Texas Transportation Institute. This phase deals specifically with synthetic aggregates for use in flexible base, and its primary objective is to develop acceptance criteria for such aggregates. It was initiated in 1966, after non-bloated, ...
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