Influence of ground granulated blast furnace slag on the early-age anti-cracking property of internally cured concrete

Abstract

The influence of ground granulated blast furnace slag (GGBFS) on the mechanical properties and autogenous shrinkage of concrete has been studied. However, investigations on the influence of GGBFS on the early-age anti-cracking property of internally cured high performance concrete (ICC) with super absorbent polymers (SAPs) are still lacking. Investigations on the anti-cracking property of ICC with GGBFS were conducted under adiabatic condition at uniaxial restraint degree by using Temperature Stress Test Machine in the present study. Results and corresponding analysis showed that: (1) the addition of SAPs decreased the autogenous shrinkage, restrained tensile stress rate, and increased the temperature drop, as well as increased the anti-cracking property of high performance concrete; (2) the temperature rise, temperature drop and cracking stress of ICC under adiabatic condition decreased with the increase of GGBFS content; (3) the autogenous shrinkage and restrained tensile stress rate of ICC increased with the increase of GGBFS content; (4) the early-age anti-cracking property of ICC estimated by using integrated criterion decreased with the increase of GGBFS content.