This report describes the development of precision statements for the dynamic modulus and flow number tests conducted with the Asphalt Mixture Performance Tester (AMPT). Thus, the report will be of particular interest to materials and pavement structural design engineers in state highway agencies, as well as to materials suppliers and paving contractors.
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Application of Accelerated Bridge Construction Connections in Moderate-to-High Seismic Regions
Author: Marsh, M Lee | Size: 2.29 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2011 | pages: 62 | ISBN: 9780309213431
This report identifies promising details to be used for connections of bridge members in accelerated bridge construction in medium to high seismic regions and gives recommendations for further research. Existing connection details were gathered from state departments of transportation, industry, and academia and were evaluated for their performance in terms of readiness for use, construction risk, durability, and seismic performance. The material in this report will be of immediate interest to bridge engineers.
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This report documents an analysis of 1,500 bridges that represent various material types and configurations using AASHTOWare™ Virtis® to compare the load factor rating to load and resistance factor rating for both moment and shear induced by design vehicles, AASHTO legal loads, and eight additional permit/legal vehicles. The report includes proposed revisions to the "AASHTO Manual for Bridge Evaluation" based on a review of the analysis results. The material in this report will be of immediate interest to bridge engineers.
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This report presents crash modification factors (CMFs) for safety strategies at signalized intersections. CMFs are a tool for quickly estimating the impact of safety improvements. The report will be of particular interest to safety practitioners responsible for programming and implementing highway safety improvements at intersections.
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This report presents design guidance for strengthening of soils to resist lateral forces on bridge pile foundations. Lateral loads may be produced by wave action, wind, seismic events, ship impact, or traffic. Strengthening of soil surrounding the upper portions of piles and pile groups—for example by compaction, replacement of native soil with granular material, or mixing of cement with soil—may be more cost-effective than driving additional piles and extending pile caps as ways to increase the bridge foundation's capacity to resist lateral forces associated with these loads. This report presents computational methods for assessing soil-strengthening options using finite-element analysis of single piles and pile groups and a simplified approach employing commercially available software. The analysis methodology and design guidelines will be helpful to designers responsible for bridge foundations likely to be exposed to significant lateral loads.
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Author: Hallin, J P Sadasivam, S Mallela, J Hein, D K Darter, M I Von Quintus, H L | Size: 2.97 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2011 | pages: 78 | ISBN: 9780309213486
This report presents a recommended "Guide for Pavement-Type Selection." The guide includes practical, logical, and transparent processes for conducting systematic evaluations of pavement alternatives and for making decisions on pavement-type selection. These processes can be used for both agency-based and contractor-based type selections and may be applied to different pavement types and structures. These processes are supplemented by examples to illustrate the application of the recommended guide for the commonly encountered scenarios of alternative bidding and design-build of operations and maintenance projects. The material contained in the report will be of immediate interest to state pavement engineers, design consultants, paving contractors, and others involved in project design and pavement-type selection.
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Proposed Specifications for LRFD Soil-Nailing Design and Construction
Author: Lazarte, Carlos A | Size: 6.47 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2011 | pages: 145 | ISBN: 9780309213516
This report contains proposed specifications for the design and construction of soil-nailed retaining structures. Despite their advantages in cut applications, these structures are not available to some state departments of transportation, due to the lack of guidance for their use in AASHTO's standard specifications based on load and resistance factor design (LRFD). This report will be of interest to geotechnical engineers and construction managers, who would like to promote a more common utilization of soil nailing.
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This report provides a proposed performance-related specification (PRS) for hot-mix asphalt (HMA) in the form of the Microsoft Windows®-based Quality-Related Specification Software (QRSS). The report details the research performed and illustrates the development of the QRSS and its ability to carry out pay adjustment factor and payment computations by comparing the as-built pavement performance with that of the as-designed pavement. Thus, the report will be of immediate interest to staff of state highway agencies, materials suppliers, and paving contractors with responsibility for specification and construction of HMA pavements.
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Investigation of Short-Term Laboratory Aging of Neat and Modified Asphalt Binders
Author: Anderson, David A Bonaquist, Ramon | Size: 3.56 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2012 | pages: 76 | ISBN: 9780309213639
This report provides a proposed method of test for short-term laboratory aging of neat and modified asphalt binders using the Modified German Rotating Flask (MGRF) as an alternative to the Rolling Thin Film Oven Test (RTFOT, AASHTO T 240). Thus, the report will be of immediate interest to staff of state highway agencies, materials suppliers, and paving contractors with responsibility for specification and testing of asphalt binders.
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Guidance for the Selection, Use, and Maintenance of Cable Barrier Systems
Author: Marzougui, Dhafer Mahadevaiah, Umashankar Tahan, Fadi Kan, Cing Dao (Steve) McGinnis, Richard Powers, Richard | Size: 35.38 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2012 | pages: 142 | ISBN: 9780309258425
This report provides guidance for the selection, use, and maintenance of cable barrier systems. While cable barrier systems have been in use for more than 70 years, their use has been on the rise and is expected to continue in the future. The increase in use of cable barrier systems has been attributed to the success rate in keeping vehicles from crossing the median, reducing roadway departures, and decreasing impact severity. Due to advancements in cable barrier system technology, installation and repair costs are lower and cable barrier use has increased in varying roadway environments. Safety studies, although limited, have shown that cable barriers help reduce those median cross-over collisions that lead to some of the most severe head-on type crashes. This document will be of particular interest to design, maintenance, traffic, and safety engineering professionals.
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