Research Progress on the Performance of Fiber-Reinforced Geopolymer

Abstract: Geopolymer (GP) is an environmentally friendly cementitious material with an amorphous to semi-crystalline structure, synthesized from aluminosilicate precursors via chemical activation. Its preparation process is straightforward and eco-friendly, endowing the material with high compressive strength, excellent corrosion resistance, remarkable high-temperature and fire resistance, and effective ion sealing capability. As such, GP is regarded as one of the most promising green alternatives to ordinary Portland cement. However, similar to conventional cement, GP exhibits brittle failure behavior. Although it possesses high compressive strength, its tensile and flexural performance requires further improvement. Studies have shown that incorporating an appropriate amount of fiber can significantly enhance the mechanical and functional properties of GP. This review examines the effects of various commonly used fibers—including natural, steel, synthetic, and other fiber types—on the physical and mechanical characteristics of GP. Furthermore, it addresses current challenges in fiberreinforced geopolymer (F/GP) research and identifies prospective directions for future investigation and engineering applications.