Geopolymers usually exhibit poor tensile and flexural strengths due to their brittleness and ceramic features, which are easy to cause catastrophic failure limiting their applications. Fibers can be incorporated into geopolymers to improve flexural properties and fracture toughness. In this work, the effects of four types of fibers including bamboo, basalt, glass, and polypropylene (PP) on bulk density, apparent porosity, water absorption, and compressive and flexural strengths of geopolymers were investigated based on alkali-activated metakaolin. The compressive strength of the composites dec...
