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Performance of self-consolidating concrete in prestressed girders.
  • Published Date:
    2010-04-01
  • Language:
    English
Filetype[PDF-4.05 MB]


Details:
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  • OCLC Number:
    715302638
  • Edition:
    Technical report.
  • NTL Classification:
    NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures ; NTL-HIGHWAY/ROAD TRANSPORTATION-Materials ; NTL-HIGHWAY/ROAD TRANSPORTATION-Construction and Maintenance ; NTL-HIGHWAY/ROAD TRANSPORTATION-Design ; NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance ;
  • Abstract:
    A structural investigation of self-consolidating concrete (SCC) in AASHTO Type I precast, prestressed girders was performed. Six test girders were subjected to transfer length and flexural testing. Three separate concrete mixtures, two girders per mixture, were used to construct these specimens. A moderate-strength, conventional-slump concrete mixture, similar to the concrete used in typical ALDOT girders was evaluated versus moderate-strength SCC and high-strength SCC. No significant difference in transfer bond behavior was found between the full-scale SCC girders and the conventional concrete girders. High-strength SCC girders had shorter transfer lengths than moderate-strength (SCC and conventional) girders. After normalization to account for the difference in prestress magnitude and concrete strength, there was no discernible difference in the magnitude of the transfer lengths between the concrete types. After a composite, cast-in-place concrete deck was added to each girder, flexural testing was performed near each girder end, resulting in two flexural tests per girder. Embedment lengths were varied for each test in order to bracket the AASHTO strand development length. Results indicated that the use of SCC had no adverse effects on the overall flexural performance, and the flexural bond lengths were conservatively predicted by the relevant ACI and AASHTO expressions. Similarly, the SCC girders exhibited comparable service-level performance to the conventional girders. Based on the work performed in this study SCC should perform well in prestressed concrete girder applications.
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