Experimental investigation on strength properties of lignite fly ash geo polymer concrete

Abstract

The demand for Portland Cement is growing demand day by day. The main reasons for facing these challenges are limited reserves of lime stone and high increase in carbon taxes.This paper presents the strength properties of high calcium based geo polymer concrete. The high calcium fly ash was activated with sodium hydroxide (NaOH) and sodium silicate solution cured at ambient temperature. The optimum sodium silicate to sodium hydroxide ratio for optimum strength geopolymer was 1.5 and the concentration of NaOH was 14M. Different mixes were proportioned by varying the percentage of aggregates in the density of concrete. The proportions were 60%, 65%, 70%, 75% and 80%. Strength tests such as compression test, split tensile test and bond strength test were carryout on specimens and the results were obtained. The mix proportion with 70% of aggregates in the density of concrete manifested good strength in compression, tension and bond strength.