Performance Enhancement of Hybrid Fiber Reinforced Geopolymer Concrete
摘要
This study investigates the impact of various binders including fly ash, ground granulated blast furnace slag (GGBS), metakaolin, and silica fume along with the influence of 1% polyvinyl alcohol (PVA) fibers and crimped steel fibers of varying dosages, on the mechanical properties of geopolymer concrete. The research focuses on optimizing fiber and binder combinations for two concrete grades: 30 and 50 MPa. Experimental results demonstrate that incorporating 1% PVA fibers with 0.5% steel fibers significantly enhances compressive strength nominally while there is minimal increment in tensile, and flexural strength is noticed. Increasing steel fiber content beyond 0.5% yields negligible strength gain while adversely affecting workability and mix homogeneity due to fiber clustering. Specimen failures exhibited ductile behavior across all cases, underscoring the effectiveness of hybrid fibers in improving geopolymer concrete’s ductility and mechanical performance. These findings provide valuable insights into optimizing fiber-reinforced geopolymer concrete for enhanced performance.