Effect of Curing Time On Strength Of Geopolymer Mortar Incorporating Silica Waste

Abstract

Abstract

The objective of this research is to study the effect of curing time on compressive strength of silica waste based
geopolymer mortar. The basic physical and chemical properties of silica waste, silica waste to pure alumina ratio, binder to sodium hydroxide to sodium silicate solution ratio on compressive strength of geopolymer mortar were studied. The mortar was cast in 5*5*5 centimeters cubic shape with cured temperature at 60 0C for 24 hours. Compressive strength of geopolymer mortar was tested at 1, 3, 7 and 14 days. The results revealed that the chemical characteristics of silica waste contain an average of 71.3
percent of silicondioxide. The leaching tests of heavy metals also indicated that the concentration of all heavy metals were within the standard set by the Ministry of Industry, Thailand. The silica waste was considering as non hazardous waste. The silica waste to pure alumina ratio of 2:1 and binder to sodium hydroxide to sodium silicate solution ratio of 70:10:20 (B2) by weight gave the compressive strength at 199 ksc which pass the compressive strength standard at 180 ksc on the first days. While the ratio of 60:20:20 (A1) by weight gave the compressive strength at 194 ksc which pass the compressive strength standard at 180 ksc on the
third days.