Effect of Modified Geopolymer Self Compacting Concrete Using Rice Husk Ash

Abstract

Self-Compacting Geopolymer Concrete (SCGC) in concrete construction is a revolutionary building material. As the name implies there is no requirement for compaction attempts to ensure complete compaction. It employs Supplementary Cementitious Materials (SCM) along with alkaline solutions such as sodium hydroxide, sodium silicate and super plasticizer which form a binder for the formation of framework and strength. In this paper, SCGC based on fly ash (FA) is replaced by varying Rice Husk Ash (RHA) percentages. The results revealed the production of self-compacting geopolymer concrete using RHA with potentially 60MPa high compressive strength, which can substitute traditional cement concrete and therefore minimize carbon emissions. Improved compressive and split tensile strength and modulus of elasticity with RHA incorporation of up to 5 percent were reported. Above the optimum 15 percent content, adverse effects were recorded by RHA incorporation. Regarding the ecological issues associated with RHA dumping, it will be necessary to utilize such an agricultural by-product. It is also useful to understand the use of RHA as concrete raw material because it can be used as renewable and multi-functional components. Ultimately, the mechanical reliability improvement provided in this study will help offer a strong basis for the production of dynamic filler materials for high strength concrete.