4. Mechanical Properties of Fiber Reinforced Geopolymers

4.1 Compressive strength

Geopolymers are provided with excellent mechanical properties, among which, compressive strength is the most important index. The compressive strength of the specimen depends on the flow resistance of the mixture, while the flow resistance and slump depend on the type, size and weight of the fiber. The proper uniformity and high pressure compaction between the fiber and the cement matrix can improve the compressive strength by the application of fibers. However, for geopolymer, different fibers exercise different effects on the compressive strength[32].