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Publication Number: FHWA-HRT-05-060
Compilation and Evaluation of Results From High-Performance Concrete Bridge Projects
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FHWA Contact: Joey Hartmann, 202-493-3059
This document is a technical summary of the report Compilation and Evaluation of Results From High-Performance Concrete Bridge Projects, Volume I: Final Report FHWA-HRT-05-056, published by the Federal Highway Administration.
In 1993, the Federal Highway Administration (FHWA) initiated a national program to implement the use of high-performance concrete (HPC) in bridges. The program included the construction of demonstration bridges throughout the United States. In addition, other States have implemented the use of HPC in various bridge elements. Construction of these bridges has provided a large amount of data about the use of HPC. In addition, the need to update the American Association of State Highway and Transportation Officials (AASHTO) specifications for materials, test methods, bridge design, and bridge construction for use with HPC has been identified.
The objectives of the project were as follows:
Compilation of Information on HPC Bridges
Information from 19 bridges located in 14 States was collected. The compilation includes information on the benefits of HPC, costs, structural design, specified concrete properties, concrete mix proportions, measured concrete material properties, associated research projects, sources of data, miscellaneous details, and HPC specifications. The information was placed on a compact disc for easy retrieval.
Review of the AASHTO Specifications
The following AASHTO specifications were reviewed to identify provisions that directly impact the use of HPC:
Based on the review and available information, proposed revisions or proposed research problem statements were developed.
Proposed Revisions to the AASHTO Specifications
Proposed revisions to 15 material specifications, 14 test methods, 30 articles of the standard design specifications, 17 articles of the Load and Resistance Factor Design (LRFD) bridge design specifications, and 16 articles of the LRFD bridge construction specifications were developed. In addition, a new materials specification for combined aggregates and a new test method for slump flow were proposed. For the two design specifications, most of the revisions involved the use of high-strength concrete. For the other specifications, the revisions involved concrete materials for HPC.
Recommendations for Needed Research
The following research problem statements were developed to provide a basis for future revisions to the AASHTO specifications:
Evaluation of the FHWA Definition
A review of the FHWA definition of HPC was made to determine if the performance characteristics, test methods, and range of grades were appropriate and to propose any modifications based on experience with the definition since it was published in 1996.
Based on the review, the eight existing characteristics of freeze-thaw durability, scaling resistance, abrasion resistance, chloride penetration, compressive strength, modulus of elasticity, shrinkage, and creep are appropriate, with the addition of alkali-silica reactivity, sulfate resistance, and flowability. Abrasion resistance and creep, however, should only be specified for special situations. Three grades should be assigned to each characteristic, and the values in each grade should be revised to reflect recent data and experience and to raise the performance level of each characteristic. Several modifications to the test methods are suggested.
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