United States Department of Transportation
i
Self-consolidating concrete for prestressed applications - phase II : bridge construction and in-place performance.
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2015-04-01
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[PDF-5.18 MB]
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Abstract:Prior to statewide acceptance of self-consolidating concrete (SCC) in precast, prestressed bridge member
production, the Alabama Department of Transportation sponsored an investigation of the material to be
performed by the Auburn University Highway Research Center. Two parts of that research are presented in
this report: an extension of an earlier laboratory investigation of fresh stability test methods to quantify the
unique fresh behavior of SCC, and a field investigation of as-built material and long-term structural behavior
in the first full-scale SCC girders produced and placed in an in-service bridge in Alabama.
During the laboratory investigation, the Visual Stability Index, Sieve Stability, and Surface Settlement
tests correlated most strongly to multiple measures of hardened concrete uniformity; a testing protocol utilizing
these test methods is recommended. In the field investigation, the utilized SCC exhibited slightly increased
time-dependent creep and shrinkage, at least in representative cylinders. Long-term SCC-girder prestress
maintenance was found to be practically identical and at least as conservatively predictable as in companion,
geometrically identical vibrated-concrete (VC) girders. Full-scale elastic responses to the weight of the cast-in-place deck and to service-level live loads were also practically identical in the SCC and VC girders, and SCC
performed more conservatively than expected of VC of the same elastic stiffness. Use of cylinder-measured
mechanical and time-dependent property results led to conservative predictions of full-scale behavior, and use
of design properties led to highly conservative predictions. Based on these results, SCC is an acceptable
alternative to VC for precast, prestressed girders when using current design and production procedures.
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