فهرست نشریات علمی دسترسی آزاد ایران

As Portland cement production greatly affects the environment, more focus is being placed on using geopolymer concrete (GPC) as an alternative. This study explores the mechanical performance of high-performance fiber-reinforced geopolymer concrete (HPFRGC) using slag-based binders partially replaced with silica fume at levels of 0%, 5%, 10%, and 15%. The effects of incorporating steel and glass fibers at 0.5% and 1% volume fractions on compressive and splitting tensile strengths were also evaluated at 7 and 28 days. Results indicate that 5–10% silica fume replacement enhances compressive and tensile strength, with 10% being optimal. Excessive replacement (15%) reduced strength due to dilution of reactive content. Steel fibers were more effective than glass fibers, particularly at 1% content, yielding up to 12.7% and 38.6% improvements in compressive and tensile strengths, respectively. Moderate benefits were seen from using glass fibers, mainly in tensile performance. Failure pattern analysis showed that fiber-free specimens experienced brittle fractures, while fiber-reinforced mixes exhibited improved crack control and ductility. Overall, the combined use of 10% silica fume and 1% steel fiber offers the best enhancement in mechanical performance, suggesting an effective approach for developing sustainable, high-performance geopolymer concretes.