Experimental study on mechanical properties of hybrid fiber quaternary concrete with upplementary cementitious materials subjected to extended curing period

Abstract

The present study investigated the effect of Supplementary Cementitious Materials (SCMs) on mechanical properties of quaternary blended hybrid fiber cement concrete subjected to longer curing periods. Cement was partially replaced with SCMs like fly ash, rice husk ash and lime stone powder concrete was reinforced with steel, carbon and fibrillated polypropylene fibers in different proportions. Steel fibers were added at volume fraction of 0.5%, 1% and 1.5 % while carbon and fibrillated polypropylene fibers at weight fraction of 0.25% and 0.5% in the concrete mix. Carbon fibers were added in mono form and in hybrid form with steel and polypropylene fibers. Compressive strength, split tensile strength, flexural strength and impact resistance of all the mixes were investigated at 56 and 90 days. The tests results revealed that steel-carbon and steel-carbon-polypropylene hybrid fiber reinforced concrete performed better in compressive, split tensile, flexural strength properties and impact resistance than control and mono carbon fiber reinforced concrete. The results also revealed that substitution of cement with SCMs greatly influenced the mechanical properties of the fiber reinforced concrete at the later ages.