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Measurement of fresh concrete properties - Part 2: Concrete


Effect of temperature, time and waiting conditions onthe rheology of SCC

 


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 CPI 4/09. 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.

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CPi worldwide journals are trade journals for the concrete and precast concrete industry that are published in 10 different language editions in more than 170 countries. These trade journals, with their practical editorial reporting on research, production and applications, are specifically addressing the decision makers of the concrete and precast concrete industry.

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