Simple Performance Tester for Superpave Mix Design: First-Article Development and Evaluation
Author: Bonaquist, R F Christensen, D W Stump III, W | Size: 2.96 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2003 | pages: 168 | ISBN: 0309087821
This report presents the findings of a research project to develop a practical, economical simple performance tester for use in routine Superpave mix design and possibly in the characterization of hot mix asphalt (HMA) materials for pavement structural design. In the phase of the work reported here, first-article simple performance testers (SPTs) procured from two different manufacturers were evaluated, and both units were found to meet the requirements of the performance-based purchase specification. Based on these results, the Federal Highway Administration (FHWA) is coordinating a pooled-fund purchase of production units for evaluation by the state highway agencies. Four of these units will be immediately purchased in the next phase of this project for use by state highway agencies and FHWA to test the ruggedness of candidate simple performance tests. Thus, the report will be of particular interest to materials engineers in state highway agencies, as well as to materials suppliers and paving contractor personnel responsible for design and production of hot mix asphalt and the specification and purchase of laboratory test equipment.
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Quality and Accuracy of Positional Data in Transportation
Author: Fekpe, E S Windholz, T Beard, K Novak, K | Size: 2.82 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2003 | pages: 108 | ISBN: 0309087813
This report presents guidance for practitioners on the use of positional, or spatial, data in Geographic Information Systems (GIS) for transportation applications. As GIS applications become more common in transportation system management and decision making, concerns have grown about the accuracy of the data used to populate them. Transportation spatial data usually describes the location of features on the highway system using a one-dimensional linear referencing system. The level of accuracy varies by data source and is affected by the precision of the measurement system used to collect it. Agencies need a way to understand the errors that may result when using these data in GIS applications and how these errors may be compounded when combining data from various sources. This project reviewed the linear referencing systems used by state departments of transportation, examined the limitations of typical data sources used in these systems, and developed a model to evaluate the effects of varying data accuracy and provide an assessment of the level of confidence in the system outputs. This report will provide valuable information to transportation practitioners who need to understand and account for the level of precision in GIS-based transportation decision tools.
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Bonded Repair and Retrofit of Concrete Structures Using FRP Composites
Recommended Construction Specifications and Process Control Manual
Author: Mirmiran, A Shahawy, M Nanni, A Karbhari, V | Size: 810 KB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2004 | pages: 104 | ISBN: 0309087856
This report contains the findings of research performed to develop recommended construction specifications and a construction process control manual for bonded fiber reinforced polymer (FRP) repair and retrofit of concrete structures. The material in this report will be of immediate interest to bridge construction inspectors, general contractors, FRP subcontractors, and FRP and adhesive materials suppliers.
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Author: Saeed, A Hall Jr, J W | Size: 377 KB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2003 | pages: 56 | ISBN: 030908783X
This report provides definitions and guidelines to help agencies involved in accelerated pavement testing (APT) ensure proper interpretation of the data and facilitate their use by other agencies. Use of these guidelines will promote compatibility of data resulting from APT at different facilities and will provide an effective means for economically addressing issues of common concern, reducing duplication of research efforts, and enhancing the benefits of APT. The report is a useful resource for pavement and materials engineers, researchers, and others involved in the accelerated evaluation of pavement materials, designs, and features.
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Posted by: mahyarov - 10-24-2012, 09:15 AM - Forum: Concrete
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Extending Span Ranges of Precast Prestressed Concrete Girders
Author: Castrodale, R W White, C D | Size: 24.14 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2004 | pages: - | ISBN: 0309087872
This report contains the findings of research performed to develop recommended load and resistance factor design (LRFD) procedures for achieving longer spans using precast prestressed concrete bridge girders. Standard details and examples illustrating the design of three typical bridges were also developed. The material in this report will be of immediate interest to bridge designers. Each year, 200 to 300 bridges are built with spans exceeding 160 feet. Generally, these spans are not designed with precast prestressed concrete girders because of limited experience and limited information. In addition, the size and weight of many precast sections precludes land transportation. Limited choices lead to decreased competition between bridge types and materials, which results in higher costs to owners. Solutions to increase the span range of precast prestressed concrete girders used in the United States and abroad include splicing segments for longer simple or continuous spans, connecting simple spans for continuity, and assembling haunched pier segments in the field. However, this experience and the technology for applying these solutions are fragmented and job-specific. The objective of this research was to develop recommended LRFD procedures, standard details, and design examples for achieving longer spans using precast prestressed concrete bridge girders. The report fully documents the research leading to the conclusion that spliced-girders are the design option with the greatest potential for extending span length. Detailed design examples for one-, two-, and three-span spliced girder bridges are included as appendixes.
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Safety Evaluation of Permanent Raised Pavement Markers
Author: Bahar, G Mollett, C Persaud, B Lyon, C Smiley, A Smahel, T McGee, H | Size: 816 KB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2004 | pages: 68 | ISBN: 0309087902
This report presents the findings of a research project to evaluate the safety performance of snowplowable permanent raised pavement markers (PRPMs) on two-lane roadways and four-lane freeways. An analytical engineering procedure relying on safety performance functions or crash prediction models for roadways with and without PRPMs was developed to determine the potential cost-effectiveness of implementing PRPMs at a location. The report will be of particular interest to traffic engineers with responsibility for installing and maintaining pavement marking systems.
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Posted by: mahyarov - 10-24-2012, 09:08 AM - Forum: Concrete
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Connection of Simple-Span Precast Concrete Girders for Continuity
Author: Miller, R A Castrodale, R Mirmiran, A Hastak, M | Size: 4.72 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2004 | pages: 203 | ISBN: 0309087937
This report contains the findings of research to develop recommended details and specifications for the design of continuity connections for precast concrete girders. Examples illustrating the design of four precast girder types made continuous for live load were also developed. The material in this report will be of immediate interest to bridge designers.
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Load and Resistance Factor Design (LRFD) for Deep Foundations
Author: Paikowsky, S G Birgisson, B McVay, M Nguyen, T Kuo, C Baecher, G Ayyub, B Stenersen, K O'Malley, K Chernauskas, L O'Neill, M | Size: 1.86 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2004 | pages: 85 | ISBN: 0309087961
This report contains the findings of a study to develop resistance factors for driven pile and drilled shaft foundations. These factors are recommended for inclusion in Section 10 of the AASHTO Load and Resistance Factor Design (LRFD) Bridge Design Specifications to reflect current best practice in geotechnical design and construction. The report also provides a detailed procedure for calibrating deep foundation resistance. The material in this report will be of immediate interest to bridge engineers and geotechnical engineers involved in the design of pile and drilled shaft foundations.
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Guideline and Recommended Standard for Geofoam Applications in Highway Embankments
Author: Stark, T D Arellano, D Horvath, J S Leshchinsky, D | Size: 1.61 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2004 | pages: 73 | ISBN: 0309088046
This report provides a design guideline and recommended standard for geofoam applications in the design and construction of highway embankments. The guidelines and standard will assist highway agencies in designing and constructing highway embankments using expandable polystyrene (EPS) blocks. The report will be of immediate interest to engineers in the public and private sectors involved in the design, construction, and material specification of lightweight embankments constructed on soft foundation soils.
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Author: Wassef, W G Davis, D | Size: 1.37 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2004 | pages: 97 | ISBN: 0309088127
This report contains the findings of research to develop recommended details, design methodologies, and specifications for integral connections of steel superstructures to concrete intermediate piers. An example illustrating the design of the connection of the cap beam to the girders and column is also included. The material in this report will be of immediate interest to bridge designers.
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