Abstract: The principal ingredient of concrete, Ordinary Portland Cement (OPC) is unfortunately found to be associated with some adverse effects. Employing such by-products as alternates for cement has multiple benefits including conservation of environment, sustainability of resources and solving the disposal problem of by-products. One of the alternative is ‘Geopolymer Concrete’ (GPC) .The source materials of geopolymer could be of geological origin like metakaolin or by-product materials like fly ash, Ground Granulated Blast furnace Slag (GGBS), silica fume, rice-husk ash, etc. Black Rice Husk Ash (BRHA) is an agro-industrial waste obt ained by incinerating the rice husk and has a high content of unburnt carbon. Consequently, the use of BRHA as a construction material is very limited, even though it has high silica content about 90%. The objective of the present study was to develop geopolymer concrete mixtures using GGBS and BRHA. The investigation utilized GGBS as the base material for making the control geopolymer concrete. Then BRHA was used to replace GGBS in the mix in three different proportions, from 10-30%, for the rest of the mixes used in the study Basic strength parameters like tensile strength, flexural strength and modulus of elasticity of GPC were studied. Besides Addition of BRHA beyond 10% in GPC retarded its strength development. However, the strengths were well above the target strength up to 20% replacement levels of BRHA in GPC At the same time, addition of BRHA significantly improved the durability. Addition of BRHA beyond 20% is not beneficial.
Keywords: geopolymer, concrete, Ground Granulated Blast furnace Slag, Agro waste, Black Rice Husk Ash, Modulus of elasticity, tensile strength.
Title: Strength Tests on Geopolymer Concrete Made With Black Rice Husk Ash and Ground Granulated Blast Furnace Slag
Author: S. POORNIMA
International Journal of Civil and Structural Engineering Research
ISSN 2348-7607 (Online)
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