Strength and Resistance of Alkali-Activated Slag Concrete to High Temperature

Abstract

This study presents an investigation into high-temperature resistance of alkali-activated slag concrete (AASC). Sodium oxide (Na2O) concentrations of 4%, 5% and 6% of slag weight and liquid sodium silicate (SiO2) with modulus ratio of 0.8 ( mass ratio of SiO2 to Na2O ) were used as activators to activate granulated blast furnace slag (GBFS). All cylindrical specimens with the same binder content and liquid/binder ratio of 0.5 were cast and cured in the air, under the saturated limewater and in a curing room at relative humidity of 80% RH and temperature of 60 °C, respectively. Test results demonstrate that the high-temperature resistance of AASC decreased with an increase of temperature. The compressive strength and high-temperature resistance of AASC improved with an increase dosage of Na2O and AASC cured at relative humidity of 80% RH and temperature of 60 °C has the superior performance, followed the AASC by air curing and saturated limewater curing. The higher compressive strength and superior high-temperature resistance have been obtained in AASC than comparable OPC.

Influence of elevated temperature on alkali-activated ground granulated blast furnace slag concrete

“…At several instances, these alkaline components are simply mixed with dry slag to form a ready to use binder material, which further gets mixed with water to form AAS concrete (Arioz, 2007). In respect of the compressive strength, flexural strength, drying shrinkage and water absorption, AAS behaves better as compared to OPC (Chi et al, 2012). Concrete is the composite material produced from aggregate, cement and water (Kumar et al, 2017).…”