Workability and compressive strength development of self-consolidating concrete incorporating rice husk ash and foundry sand waste - A preliminary experimental study

摘要

The combined advantages of wastes in high-performance concrete production are currently popular topics of investigation. This study aims to examine the effect of foundry sand waste (FDW) as a fine aggregate replacement (30 and 50%wt) on the properties of self-consolidating concrete (SCC) mixed with untreated rice husk ash (RHA) as a cement replacement (10 and 20%wt) with controlling water-binder materials ratios (w/b) of 0.35 and 0.45. The workability and strength characteristics of SCC are considered. The results indicate that the increase in FDW amount affects the SCC with RHA, increases the required superplasticizer and setting times compared to the control SCC, and decreases the density and slump flow loss. The incorporation of RHA and FDW decreases the filling and passing ability of the SCC. Based on the workability requirements specified by EFNARC guidelines, SCC mixtures exhibited acceptable V-funnel performance at replacement levels of RHA and FDW not more than 10 and 30?wt% and achieved the highest compressive and splitting strengths. (C) 2019 Elsevier Ltd. All rights reserved.