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- W587776101 abstract "This article describes the methods for using self-consolidating concrete (SCC) for the drilled-shaft foundations on the I-35W bridge, which was constructed on a 15-month schedule to replace the bridge that collapsed on August 1, 2007, at the same Mississippi River crossing. The SCC used here was high-performance, high-pozzolan concrete and represented the first large-scale use of cast-in-place SCC for the Minnesota Department of Transportation (MnDOT). It needed specified air content of six to eight percent and a slump flow of 23 to 27 in. with a stability index of one or less. A polycarboxolate-based superplasticized and a water-binding, viscosity-modifying admixture were used to transition the concrete from a Bingham plastic to a Newtonian fluid. The heat of hydration was cut by about half, increasing the compressive strength. One of the challenges was to monitor and restrict any excess water, including the snow and ice accumulated on stockpiled materials during the winter and early spring at the Minnesota site. After the pours, which occurred in the entire main bridge pier shafts of seven and eight feet in diameter, and in the four-foot diameter shafts on the north abutment, temperatures were found to fall well within the desired profiles. Testing has shown it to have achieved the strength of 10,000 psi, twice the design requirement." @default.
- W587776101 created "2016-06-24" @default.
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- W587776101 date "2008-09-01" @default.
- W587776101 modified "2023-09-24" @default.
- W587776101 title "Self-Explanatory: The Benefits of Using Self-Consolidated Concrete Stand Clear at I-35W Bridge Site" @default.
- W587776101 hasPublicationYear "2008" @default.
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