Abstract

Compared with conventionally vibrated concrete (CVC), the rheological properties of self-consolidating concrete (SCC) should be closely controlled in order to satisfy fresh property requirements. Rheology of concrete is normally described by Bingham model. To investigate the effects of various aggregate properties on rheology of SCC, 25 mixtures were studied. It was found that higher aggregate volume, higher fine aggregate to coarse aggregate ratio, smaller aggregate size, and lower aggregate packing density may increase yield stress of SCC mixture. Aggregate size has an insignificant effect on plastic viscosity. Mixtures with slump flow less than 580 mm exhibited anti-thixotropy manner, whereas mixtures with slump flow 630 mm or higher showed thixotropy manner. No clear correlation was observed between plastic viscosity and T50 and Tf in the slump-flow test.

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