Abstract
A self-consolidating concrete (SCC) mix was developed to accelerate the construction of replacement slabs in concrete pavement rehabilitation projects. This work was part of a larger research project to develop an innovative process involving the use of temporary and reusable precast slabs and an SCC mix for construction of replacement slabs to reduce construction time and increase contractor production in concrete pavement rehabilitation projects. Two requirements were set for the SCC mix, high workability and flow rate without segregation, and a minimum 6-h compressive strength of 2,200 pounds per square inch [psi (15 MPa)] required by the Florida Department of Transportation (DOT). The SCC mix incorporated Grade 57 aggregate as well as a combination of admixtures, including a high range water reducer, workability retainer, water reducer and set retarder, and accelerator. Laboratory trial batches were prepared for the proposed mix and tested for workability and strength. On the basis of test results of the trial batches, the refined SCC mix was developed to achieve the high workability needed for faster concrete discharge and finish and to attain the Florida DOT's 6-h strength requirement of 2,200 psi (15 MPa) for slab replacements.
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Schedule a callMore From: Transportation Research Record: Journal of the Transportation Research Board
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