This report presents a methodology for classifying aggregates based on the distribution of shape, texture, and angularity characteristics and recommends a test method for measuring these characteristics to help improve specifications for aggregates used in highway pavements. The test method measures shape, texture, and angularity characteristics of aggregates used in hot-mix asphalt, hydraulic cement concrete, and unbound base and subbase layers of highway pavements, and it is appropriate for use in central and field laboratories. This report will be of particular interest to materials engineers, researchers, and others concerned with the design and construction of flexible and rigid pavements.
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This report contains the findings of research performed to develop recommended revisions to the legal loads for posting as depicted in the "Manual for Condition Evaluation of Bridges" and the "Guide Manual for Condition Evaluation and Load and Resistance Factor Rating (LRFR) of Highway Bridges." The report details the development of the new loads and includes recommended revisions to the manuals to incorporate these loads. The material in this report will be of immediate interest to bridge managers and load raters. The research identified and quantified the types of short multi-axle legal vehicles operating on the public thoroughfares and the subset of these vehicles that cause overstressing.
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This report presents a recommended procedure for evaluating air-entraining admixtures used in highway concrete. The procedure involves the testing of non-air-entrained concrete and concrete containing the air-entraining admixture under simulated field conditions. Criteria are proposed for acceptance of admixtures for use in either highway pavements or structures. The recommended procedure and acceptance criteria will guide materials engineers in evaluating and selecting air-entraining admixtures that should contribute to appropriate freeze-thaw durability and thus to good performance and long service life. The content of the report will be of immediate interest to materials engineers, researchers, and others concerned with the design of concrete mixtures for use in highway pavements and structures.
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Application of LRFD Bridge Design Specifications to High-Strength Structural Concrete: Shear Provisions
Author: Hawkins, Neil M | Size: 12.41 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2007 | pages: 203 | ISBN: 9780309098861
This report contains the findings of research performed to extend the applicability of shear design provisions for reinforced and prestressed concrete structures in the "AASHTO LRFD Bridge Design Specifications" to concrete compressive strengths greater than 10 ksi. The report details the research performed and includes recommended revisions to the specifications. The material in this report will be of immediate interest to bridge designers.
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Guidelines for Concrete Mixtures Containing Supplementary Cementitious Materials to Enhance Durability of Bridge Decks
Author: Lawler, John S | Size: 3.98 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2007 | pages: 125 | ISBN: 9780309098977
This report presents guidelines to facilitate highway agencies' use of supplementary cementitious materials to enhance durability of concrete used in highway construction, especially bridge decks. Encompassed in these guidelines is a methodology for selecting optimum concrete mixture proportions. The methodology focuses on durability aspects of concrete and the performance requirements for specific environmental conditions and is presented in a text format and as a computational tool, in the form of a Visual Basic-driven Microsoft® Excel spreadsheet. Background information, a user's guide, and a hypothetical case study are also available. These guidelines should be of interest to state engineers and others involved in the design and construction of concrete bridge decks and other structures incorporating supplementary cementitious materials.
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This report will be of interest to transportation departments that are responsible for constructing and maintaining bridges that span waterways. It provides selection criteria and guidelines for the design and construction of countermeasures to protect bridge abutments and approach embankments from scour damage. Guidelines are provided for the following abutment countermeasures: riprap, cable-tied blocks, geobags, parallel walls, spur dikes located locally to the abutment, and abutment collars.
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This report describes the development of methodologies for network- and project-level optimization of multiple, user-specified performance criteria. Bridge management software modules to implement the methodologies were also developed. The report details the development of methodologies. The software modules, user's manual, and demonstration database are provided on an accompanying CD-ROM. The material in this report will be of immediate interest to bridge managers and planners.
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This report documents research performed to develop recommended revisions to the "AASHTO LRFD Bridge Design Specifications" to extend the applicability of the flexural and compression design provisions for reinforced and prestressed concrete members to concrete strengths greater than 10 ksi. The report details the research performed and includes recommended revisions to the "AASHTO LRFD Bridge Design Specifications." The material in this report will be of immediate interest to bridge designers.
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This report contains the findings of research performed to develop recommended Load and Resistance Factor Design (LRFD) live load distribution factor design equations for shear and moment. The report details the development of equations that are simpler to apply and have a wider range of applicability than current methods. The material in this report will be of immediate interest to bridge engineers.
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Countermeasures to Protect Bridge Piers from Scour
Author: Lagasse, P F | Size: 14.58 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2007 | pages: 287 | ISBN: 9780309099097
This report documents research on local scour at bridge piers resulting in the development and recommendation of a practical selection criteria for bridge-pier scour countermeasures, guidelines and specifications for design and construction of those countermeasures, and guidelines for their inspection, maintenance, and performance evaluation. Because of their critical role in ensuring bridge integrity and potentially high cost of these countermeasures, it is important that the most appropriate countermeasures be selected, designed, and constructed. The contents of this report are, therefore, of immediate interest to highway professionals responsible for planning, administrating, evaluating, designing, constructing, inspecting and maintaining bridges and other structures founded in erosive areas. The report is also of interest to those charged with specifying materials testing procedures and acceptable results, setting budget goals, and making policy.
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