Confinement Effectiveness on The Strength and Ductility from Geopolymer Concrete

Abstract

Geopolymer concrete made from fly ash as a substitute to Portland cement is a relatively new and environmentally friendly material. Various studies have revealed that geopolymer concrete is more brittle than Portland cement concrete. To increase its ductility in structures, geopolymer concrete needs to be confined. However, confinement models for geopolymer concrete are still limited. This paper compares some confinement models with stress-strain data obtained from laboratory tests. The confinement models investigated here were Ganesan et al. which was proposed for geopolymer concrete, and Mander et al. which were to Portland cement concrete. The comparison was conducted on the stress-strain action, including the characteristics from the ascending curve, the maximum stress and its corresponding strain, the descending curve. The outcomes show that the values of initial stiffness of geopolymer concrete simulated by models are higher than the actual values obtained from the tests and other confinement models. However, the maximum stress and the maximum strain values obtain from the models under estimate the test outcomes.