United States Department of Transportation
i
Performance of self-consolidating concrete in prestressed girders.
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2010-04-01
[PDF-4.05 MB]
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Edition:Technical report.
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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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