Mechanical and sustainability assessments of cement-free GGBS-based Geopolymer concrete exposed to elevated temperatures

Abstract

The current study investigates the mechanical properties of ground granular blast furnace slag (GGBS)-based geopolymer concrete (GPC) by subjecting the specimens to compressive strength and nondestructive test by exposing them to elevated temperatures. The test results revealed that the maximum compressive strength is measured as 59.7 N/mm2 with an optimum content of 7 M alkali solution and 28-day curing period. With increased heat regime, the compressive strength and nondestructive test values decreased. By adopting optimum GGBS-based GPC, the cost of construction and greenhouse gas emissions can be reduced by 48% and 13%, respectively. Compared to conventional concrete, embodied energy is on the higher side due to alkali activators.