Abstract
The present investigation is intended to study a remediation method, which consists of admixture overdosing, in order to eliminate the adverse impact of hot temperature on freshly-mixed self-consolidating concrete. Three different temperatures (43, 36, and 28°C) to simulate hot-weather conditions were used. Laboratory room conditions of 25 ± 5% R.H. and 21°C temperature were used as the control condition. Polycarboxylate-based High Range Water Reducing Admixture (HRWRA) and a Viscosity Modifying Admixture (VMA) were used at various optimum dosages to produce matrices with a slump flow of 635 ± 25 millimeters and a Visual Stability Index (VSI) of 0 (highly stable concrete). The test results revealed that the remediation method by way of admixture overdosing was successful to reverse the change in fresh properties of the selected self-consolidating concrete in elevated temperatures.
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