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Structural Performance of Prestressed Self-Consolidating Concrete Bridge Girders Made with Limestone Aggregates
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2009-05-04
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[PDF-44.18 MB]
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Corporate Contributors:South Dakota. Department of Transportation. Office of Research ; United States. Department of Transportation. Federal Highway Administration ; Mountain-Plains Consortium ; United States. Department of Transportation. University Transportation Centers (UTC) Program ; Cretex Concrete Products West. Inc
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Edition:Final Report July 2007 to April 2009
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Abstract:This study was designed to investigate the structural performance of prestressed SCC bridge girders made with limestone aggregates and to develop draft specifications, acceptance criteria, mix qualifications, and guidelines for use by SDDOT for prestressed SCC applications. The study covered in this report involved material testing of SCC mixtures and structural testing of full-scale prestressed bridge girders. Three SCC mix mixtures (w/c ratios of 0.33, 0.35, and 0.37) and one conventional concrete mixture (w/c ratio 0.33) were developed and investigated, and three full-scale prestressed girders were fabricated and tested to failure. Two of the girders were cast with SCC and one was cast with conventional concrete to serve as a control specimen. The control specimen and one of the SCC specimens were tested under increasing monotonic load until failure. The other SCC specimen was tested under increasing cyclic loading until failure. The evaluation of SCC for use in prestressed bridge girder applications included analysis of transfer length, prestress losses, camber, flexural behavior and strength, flexural rigidity, and shear strength. The results indicated that the strength growth, shrinkage, modulus of rupture, and modulus of elasticity of SCC can be determined using existing empirical equations that are used for conventional concrete, the transfer length, strength, stiffness, and prestress losses of the SCC girders were similar to those of the conventional concrete girders and were predictable using current code equations and methods. Special provisions for the use of SCC for prestressed/precast elements were developed.
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