Bond Strength of GFRP Rebars in Geopolymer Concrete Using Fine Sand

Bond Stress of Reinforcing Rebars in Geopolymer Concrete

Abstract

This article presents compressive strength and bond strength of Glass Fiber Reinforced Polymer (GFRP) in geopolymer concrete using fine sand. Parameters of compressive strength consisted of sodium silicate to sodium hydroxide solution ratio of 1.0 to 2.5, ratios of aggregate to geopolymer paste of 2.5 to 4.5 sand fineness modulus of 1.90 and 2.65 with sodium hydroxide solution concentration of 10 molar, ratio of solutions to substrate of 0.65, and maximum coarse aggregate size of 20 mm. Bond strengths of GFRP rebars in geopolymer concrete were tested with diameters between 6 to 20 mm. The results found that ratios of aggregate to geopolymer paste and sodium silicate to sodium hydroxide solution of 2.5 and 1.5, respectively can be used appropriately when consider compressive strength, workability, and environmental friendliness properties. The bond strength of 3.43√F'c/D compared to EIT standard, it is less than 24%.