Self-Compacting Concrete Containing Untreated-Mixed Fly Ash and Rice Husk Ash, Part I: Fresh Concrete Characteristics

Abstract

We evaluated the fresh characteristics of self-compacting concrete (SCC) mixtures containing rice husk ash (RHA) and fly ash (FA). The rice husk ash was used as a fine aggregate replacement at levels of 0% and 25% and the fly ash was used as a cement replacement at levels of 0, 20, 40 or 60% by volume. Trials were conducted to determine the water content required to produce SCC mixtures with a slump flow of 70 ± 2.5 cm. Fresh ability tests including water requirement, T_50cm slump flow, j-ring flow and v-funnel flow were performed on each mixture. The results demonstrate that the addition of fly ash improved the workability of the SCC mixtures, but addition of fly ash and rice husk ash increased the required water-binder ratio.