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University of Minnesota tests self-consolidating concrete in prestressed girders.

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A team of researchers at the University of Minnesota recently completed a multiyear study of prestressed bridge girders made from self-consolidating concrete (SCC), a highly workable material that spreads into place without mechanical vibration.

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The university researchers collaborated with the Minnesota Department of Transportation (Mn/DOT), which sponsored the study, and local fabricators to develop SCC mixes based on locally available materials, and then used those mixes to fabricate prestressed bridge girders and cylinders. The mixes used an assortment of cementitious materials, aggregates, and admixtures. The researchers evaluated the properties of the SCC mixes using a variety of tests they developed to determine how well the mixes flowed, how easily the coarse aggregates could pass through reinforcing obstacles, and how resistant the mixes were to segregation.

The SCC girders performed comparably to conventional concrete girders, with measured prestress losses generally agreeing with predictions. Further, the researchers determined that models of creep and shrinkage based on data from the test cylinders can give reasonable predictions of prestress losses for both conventional and SCC girders.

To download or order a copy of the study report, Self-Compacting Concrete (SCC) for Prestressed Bridge Girders (Mn/DOT 2008-51), visit www.cts.umm.edu/Publications/ResearchReports/reportdetail.html?id=1682.

University of Minnesota, Center for Transportation Studies
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Title Annotation:Technical News
Publication:Public Roads
Article Type:Brief article
Geographic Code:1USA
Date:Jul 1, 2009
Words:264
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