Effect of temperature, time, and waiting conditions on the rheology of self-compacting concrete -Part 2: concrete level

ZERBINO, R.; BARRAGÁN, B.; GARCÍA, T.; AGULLÓ, L.; GETTU, R.

Concrete Plant International

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Lugar: Alemania; Año: 2009 p. 48 - 55

1862-0027

The environmental conditions produce variations of the fresh properties of conventional as well as self-compacting concrete (SCC) and, consequently, affect the material quality during production. Though the characteristics of SCC in the fresh state are generally evaluated through engineering-type tests, rheological studies with viscometers permit a deeper comprehension of its behavior, in this manner contributing to a more rational mix design. This work is an up-scaling to the concrete level of the mortar study presented in Issue 4, 2009, of this journal. It resumes an exhaustive experimental program aiming to evaluate the influence of temperature (from 10 to 40ºC), time (up to more than 1 hour after fabrication) and waiting conditions (stationary or periodically remixed) on the properties of SCC. Rheological measurements through a BML viscometer, and slump-flow and V-funnel tests were performed. The results allow concluding that the attention to such conditions cannot be minimized.