This report summarizes the results of a project to evaluate the use of controlled low-strength material (CLSM) in highway construction applications, in particular, as backfill, utility bedding, and void fill and in bridge approaches. A key product presented in this report is a recommended practice for the use of CLSM that was validated through a series of full-scale field experiments. The report will be of particular interest to materials and construction engineers in state highway agencies and industry.
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Default Values for Highway Capacity and Level of Service Analyses
Author: Zegeer, John D | Size: 6.03 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2008 | pages: 132 | ISBN: 9780309099318
Based on the assembly of an extensive set of field data from across the United States, this report presents valuable information on the appropriate selection of default values when analyzing highway capacity and level of service. The report will be useful to planners, geometric designers, and traffic engineers who do not have ready access to field data for an analysis. The report also describes how to prepare service volume tables, which can be a useful sketch planning technique.
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Specifications and Protocols for Acceptance Tests on Processing Additions in Cement Manufacturing
Author: Taylor, Peter C | Size: 3.09 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2008 | pages: 94 | ISBN: 9780309099349
This report presents recommended changes to the cement specifications and test protocols contained in AASHTO Standard Specifications for Transportation Materials and Methods of Sampling and Testing (AASHTO M 85). These changes pertain to the amount of processing additions that can be incorporated in the cement and the tests required for evaluating acceptability of cements incorporating processing additions. The report also presents a recommended specification for evaluating processing additions that may be used in amounts exceeding those stipulated in the cement specification. These specifications will guide materials engineers and cement producers in evaluating cements and assuring that highway concrete is not deleteriously affected by the presence of such additions. The information contained in the report will be of immediate interest to state materials engineers and others involved in specifying and evaluating concrete mixtures for use in highway pavements and structures.
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This report summarizes the results of a project to establish limits, based on fatigue and fracture performance, on the number of damage and repair cycles to which damaged steel bridge girders may be subjected using the heat-straightening procedure. A key product presented here is suggested revisions to the Federal Highway Administration (FHWA) manual of practice for heat straightening. The report will be of particular interest to engineers in state highway agencies and industry responsible for bridge maintenance and repair.
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This report summarizes the results of a project to establish limits, based on fatigue and fracture performance, on the number of damage and repair cycles to which damaged steel bridge girders may be subjected using the heat-straightening procedure. A key product presented here is suggested revisions to the Federal Highway Administration (FHWA) manual of practice for heat straightening. The report will be of particular interest to engineers in state highway agencies and industry responsible for bridge maintenance and repair.
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Multimodal Level of Service Analysis for Urban Streets
Author: Dowling, Richard G | Size: 4.84 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2008 | pages: 120 | ISBN: 9780309117425
This report will be of interest to public agencies responsible for the planning, design, and operation of urban streets. This report provides a method for assessing how well an urban street serves the needs of all of its users: auto drivers, transit passengers, bicycle riders, and pedestrians. The project developed and calibrated a method for evaluating the multimodal level of service (MMLOS) provided by different urban street designs and operations.
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Transfer, Development, and Splice Length for Strand/Reinforcement in High-Strength Concrete
Author: Ramirez, Julio A | Size: 6.53 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2008 | pages: 130 | ISBN: 9780309117470
This report presents the findings of a research project to develop recommended design guidelines for safe and aesthetic roadside treatments in urban areas and a toolbox of effective roadside treatments that balance pedestrian, bicyclist, and motorist safety and mobility. The report will be of particular interest to designers and safety practitioners responsible for the design of arterial and collector-type facilities in urban areas.
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This report presents the findings of a research project to develop recommended design guidelines for safe and aesthetic roadside treatments in urban areas and a toolbox of effective roadside treatments that balance pedestrian, bicyclist, and motorist safety and mobility. The report will be of particular interest to designers and safety practitioners responsible for the design of arterial and collector-type facilities in urban areas.
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This report presents the findings of a research project to determine the crash rates for nighttime and daytime work zones, develop management practices that promote safety and mobility in work zones, and develop work-zone crash reporting recommendations to further improve the data collected on work zone crashes. The report will be of particular interest to practitioners responsible for work zone safety.
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Acceptance Tests for Surface Characteristics of Steel Strands in Prestressed Concrete
Author: Osborn, Andrew E N | Size: 7.32 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2008 | pages: 138 | ISBN: 9780309117616
This report provides practical tests to identify and measure residues (e.g., rust, lubricants used in manufacturing processes, or corrosion inhibitors) on the surface of steel prestressing strands and to establish thresholds for residue types found to affect the strength of the strand's bond to concrete. Key products presented here are four test methods suitable for use in a quality assurance program for the manufacture of steel prestressing strand. The report will be of particular interest to bridge engineers in state highway agencies and industry and to suppliers of steel prestressing strand.
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