An Experimental Study on Flexural Behaviour of Fiber Reinforced Geopolymer Concrete Slabs

Abstract

This paper deals with experimental investigation to understand the structural performance as a flexural member of Geo polymer concrete. A comparative analysis has been carried out for normal conventional concrete to that of the Steel fiber reinforced geopolymer concrete under ambient curing in relation to compressive, split tensile, flexural strengths. For the experimental work, 70% flyash and 30% GGBS as a replacement of cement and a combination of sodium silicate solution (with water content 55.9%) and sodium hydroxide flakes (with 98% purity) were used. The Alkaline solution was prepared by mixing flakes in the sodium silicate solution together one day prior to use. The ratio of sodium silicate to sodium hydroxide solution was fixed as 2.5 and the molarity of NaoH was kept as 8. Steel fiber of 1.5% of total volume of geopolymer concrete is the optimum dosage with an aspect ratio 71. As the fiber content increases compressive, split tensile and flexural strengths are proportionally increases. It is also found that with addition of fibers the load deflection is reduced by 30%.