Abstract
The effectiveness of the overdosing remediation technique – that is, using a sufficient admixture dosage during mixing – to mitigate the adverse effects of a combination of hauling time and temperatures on freshly-mixed self-consolidating concretes (SCCs) was studied. Temperatures of 43, 36, 28, 21, 14, 7, and −0.5 °C and hauling time of 10, 20, 40, 60, and 80 min were used to determine the effects of temperature and transportation times, respectively. The control condition that was adopted involved mixing the concrete at a laboratory room temperature of 21 °C and transporting the concrete with a hauling time of 10 min. A polycarboxylate-based high-range water-reducing admixture (HRWRA) and viscosity modifying admixture (VMA) were used to produce the SCCs with a slump flow of 635 ± 25 mmor 711 ± 25 mm, a VSI of 0 (highly stable concrete), and T50 of 2–5 s. The test results revealed that plastic SCCs with suitable unconfined workability, adequate flow rates, high dynamic stability, and proper passing ability could be achieved once they were remediated by the overdosing technique.
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