An Experimental Investigation on Flyash-based Geopolymer Mortar under different curing regime for Thermal Analysis

Abstract

In order to make our environment green, a lightweight inorganic aluminosilicate polymer uses waste fly ash as source material instead of cement in concrete. Source material in combination with sodium-based alkaline liquid form a cement free material called geopolymer. This paper briefly presents the thermal performance of fly ash-based geopolymer mortar such as heat resistance behavior, thermal conductivity, compressive strength and dry density under different curing regime such as ambient temperature, heat chamber, hot air oven and autoclave. Here the silicate to hydroxide ratio was fixed as 2.5 and liquid to flyash ratio was taken as 0.4 throughout the process. From the results it was found that among all curing conditions, hot air oven curing shows best outcome. On further study it was found that specimen placed in hot air oven at 80°C for 6 hours gives higher compressive strength of 27.20MPa with the dry density of 1875kg/m3 and also thermal conductivity of 0.340W/mK than 24 hours curing for 1 day which make geopolymer as more energy efficient material.