Durability and fire resistance performance of slag based geopolymer composite

Abstract

The fresh and durability properties of alkali activated mortar were investigated in this study. Ground granulated blast furnace slag (GGBFS) was used as a binder material. Both carbon fiber (CF) and polypropylene fibers (PP) were added with a ratio of (0, 0.75, 1.0, and 1.25)% to the weight of the binder. Simultaneously, hybrid fiber was also used (CF-1.0 and PP-0.25; CF-0.5, and PP-0.5; CF-0.25 and PP-1.0). The fresh property of the composite was investigated in terms of flow test. Whereas, the durability properties like fire resistance, water sorptivity, water absorption, density, porosity, efflorescence and sulphate attack were also investigated. According to the findings, increasing the fiber content reduces the flowability of the mixture. Simultaneously, the best fiber content studied was 1%, which significantly enhanced durability properties. In addition, both fibers had achieved excellent improvement. Whereas carbon fiber had more influence than polypropylene fiber regarding durability properties.