Use of Steel Fiber in Fly Ash Based Geopolymer Mortar

Abstract

This study investigated the mechanical and physical properties of fly ash geopolymer mortar containing steel fiber (SF). Hooked end steel fiber was used in geopolymer mortar at rate of 0, 0.5, 1.0 and 1.5% by volume. The properties of mortar including flow table test, compressive strength, splitting tensile strength, flexural strength, porosity, water absorption, density and ultrasonic pulse velocity were tested. The results revealed that the flow value of steel fiber geopolymer mortar gave almost the same which varied between 129-132%. The use of steel fiber in geopolymer mortar exhibited to improve mechanical properties as well as cement mortar and also increased as fiber content increasing. The 1.0% steel fiber geopolymer mortar had higher compressive, splitting tensile, and flexural strength than those of without fiber about 33%, 157%, and 183%, respectively. In addition, the use of steel fiber less than 1.5% tended to decrease the porosity of geopolymer mortars.