Influence of Curing Methods and Sodium Silicate Content on Compressive Strength and Microstructure of Multi Blend Geopolymer Mortars

This paper reports the effect of curing temperatures and sodium silicate content (NS) on compressive strength and microstructure of multi blended geopolymer mortars (GPMs). Alkaline solution was prepared by mixed sodium silicate and sodium hydroxide at 6 molarity, the sodium silicate was added as 50, 60, 65, 70, 75, 80, 85 and 100% of the total alkaline solutions. Binder to fine aggregate (B:A) and solution to binder (S:B) were fixed at 1.5 and 0.35 respectively. Multi blend binder content 55% slag (GBFS), 15% waste ceramic, 15% waste glass bottle and 15% fly ash used as a binder. In this study the samples were cured at room temperature and 60 and 90 °C of oven temperatures; Compressive strength test was carried out to determine the properties of hardened mortars. From the results, it was observed the compressive strength of GPMs in directly proportional with sodium silicate content. The results demonstrated the compressive strength and microstructure of geopolymer mortar has enhanced with increase content of sodium silicate.