Posted by: mahyarov - 10-24-2012, 10:01 AM - Forum: Concrete
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Prestress Losses in Pretensioned High-Strength Concrete Bridge Girders
Author: Tadros, M K Al-Omaishi, N Seguirant, S J Gallt, J G | Size: 1.39 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2003 | pages: 71 | ISBN: 030908766X
This report presents guidelines to help bridge designers obtain realistic estimates of prestress losses in high-strength pretensioned concrete bridge girders and thus achieve economical designs. These guidelines incorporate procedures that yield more accurate predictions of modulus of elasticity, shrinkage, and creep of concrete and more realistic estimates of prestress losses than those provided by the procedures contained in current specifications. This report will be of particular interest to engineers, researchers, and others concerned with the design of pretensioned concrete bridge structures.
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Geometric Design Consistency on High-Speed Rural Two-Lane Roadways
Author: Wooldridge, M D Fitzpatrick, K Harwood, D W Potts, I B Elefteriadou, Lily | Size: 809 KB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2003 | pages: 93 | ISBN: 0309087686
This report discusses geometric design consistency, particularly for rural roads. It presents rules on geometric design consistency suitable for use in an expert system such as the Interactive Highway Safety Design Model (IHSDM). The rules can also be used directly by a designer to evaluate roadway designs or to conduct reviews of existing roadways, improving design consistency and safety.
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Review of Truck Characteristics as Factors in Roadway Design
Author: Harwood, D W Torbic, D J Richard, K R Glauz, W D Elefteriadou, Lily | Size: 5.09 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2003 | pages: 194 | ISBN: 0309087791
This report presents guidance for roadway geometric designers on how best to accommodate large trucks on the U.S. highway system. Under National Cooperative Highway Research Program (NCHRP) Project 15-21, a research team reviewed the range of dimensions and performance characteristics of trucks currently used on U.S. highways and predicted how these characteristics may change in response to current political, economic, and technological trends. The research team conducted an analysis of those geometric design features affected by vehicle characteristics and then evaluated the adequacy of current geometric design policy to accommodate the current and anticipated truck fleet. Based on the findings, the report makes recommendations for a number of changes to the American Association of State Highway and Transportation Officials (AASHTO) "Policy on Geometric Design of Highways and Streets" ("Green Book"). The report (1) provides valuable guidance for designers of roads and facilities that need to accommodate large trucks and (2) will assist AASHTO in updating geometric design policy. The information developed in this project will also be useful as input to future editions of other documents such as the Transportation Research Board (TRB) "Highway Capacity Manual," the Federal Highway Administration (FHWA) "Manual on Uniform Traffic Control Devices," and the AASHTO "Roadside Design Guide."
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Posted by: mahyarov - 10-24-2012, 09:48 AM - Forum: Concrete
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Effects of Subsurface Drainage on Performance of Asphalt and Concrete Pavements
Author: Hall, K T Correa, C E | Size: 962 KB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2003 | pages: 60 | ISBN: 0309087589
This report contains the findings of a study to develop a methodology for estimating the impact of changes in truck weight limits on bridge network costs. The report describes the research effort and the recommended methodology and illustrates application of the methodology. A software module for automation of the recommended methodology also is included. The material in this report will be of immediate interest to bridge engineers and planners.
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Author: Fu, G Feng, J Dekelbab, W Moses, F Cohen, H Mertz, D THOMPSON, P | Size: 2.05 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2003 | pages: 197 | ISBN: 0309087597
This report contains the findings of a study to develop a methodology for estimating the impact of changes in truck weight limits on bridge network costs. The report describes the research effort and the recommended methodology and illustrates application of the methodology. A software module for automation of the recommended methodology also is included. The material in this report will be of immediate interest to bridge engineers and planners.
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Posted by: ir_71 - 10-24-2012, 09:42 AM - Forum: Archive
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Dear friends,
I'm looking for the new edition of BS EN 12504-2 from 2012 entitled: "Testing concrete in structures - Part 2: Non-destructive testing - Determination of rebound number".
If someone of you have it - please share it with me.
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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