Abstract
The rheology of self-consolidating concrete (SCC) containing metakaolin (MK) versus silica fume (SF) was compared. Plastic viscosity and yield stress were evaluated at different slump-flow values using a concrete viscometer. The effects of high-range water-reducing admixture (HRWRA) dosage, the total time for flow, the time to reach 19.68 in. (500 mm) diameter (T50), and the final diameter of the slump-flow test, as well as the influence of the mixture viscosity on the flowability and passing ability were investigated. Plastic viscosity and yield stress increased with the increased percentage of MK, but not with that of SF. However, the yield value sharply increased with the increased percentage of SF. Good correlations between slump-flow diameter and yield stress, viscosity and T50, viscosity and total slump-flow time, as well as viscosity limits for SCC mixtures based on the mixture usage, construction requirements, and member characteristics were established.
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