Journal
CEMENT AND CONCRETE RESEARCH
Volume 92, Issue -, Pages 92-97Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2016.11.020
Keywords
Yield stress; Structural build-up; Thixotropy
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It is commonly considered that the yield stress of SCC increases linearly at rest. This increase is due to the SCC structural build-up. This behavior can be explained by the cement particle nucleation at the contact points. During the first dozens of minutes, the cement particle nucleation induces a linear increase of the yield stress in time. However, recent studies have shown that the trend of the yield stress increase becomes non-linear when considering a longer time (before the setting time). This study aims to provide a theoretical frame to describe this non-linear increase. The proposed model tends toward the linear model during the first dozens of minutes and follows the observed exponential law for a longer resting time. The discrepancy with the linear model is explained by two phenomena: an increase in the solid volume fraction and a decrease in the packing fraction due to cement particle nucleation. (C) 2016 Elsevier Ltd. All rights reserved.
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