Structural Efficiency of Fiber-Reinforced Geopolymer Concrete Confined with CFRP Sheets

Abstract

Geopolymer concrete (GC) offers early strength, durability, and eco-friendliness as a substitute for regular cement. However, its long-term strength needs improvement. This study investigates how wrapping GC with CFRP sheets affects its strength. Samples with steel and polypropylene fibers at 20 MPa and 35 MPa strengths are tested. Results show significant improvements in strength and stiffness with CFRP wrapping. Notably, the 20 MPa samples saw an 86.4% increase with one layer of CFRP and a 129.4% increase with two layers, while the 35 MPa samples saw a 46% and 68.9% increase, respectively. Remarkably, the study finds that this method is more effective for lower-strength HFGC.