Strength Behavior of Geopolymer Based SIFCON with Different Fibers

Abstract

Fabricating cementitious composites with sustainable materials represents an essential aspect in the recent developments in the construction section. On the other hand, using fibers within the binding matrix to enhance its strength properties is a familiar application and holds significant importance to the research community. In this investigation, the Geopolymer matrix which is based on silica fume (micro-silica) and blast furnace slag (GGBS) was reinforced with five different fiber types to form slurry fiber reinforced concrete (SIFCON). Hook-ended steel, crimped steel, elastoplastic, macro twisted, and macro nylon fibers were used, the results revealed the fact that steel-based specimens generally yielded better results when compared to specimens reinforced with other fiber types. Normal condition results of hook-ended and crimped fiber-based specimens yielded an increment of more than 10% in both compressive and flexural strength tests while their elevated temperature results showed strength loss rates less than specimens with other fiber types. Also, with acceptable performance in both conditions, macro twisted fibers can be considered as potential fibers for geopolymer based SIFCON.