Fiber reinforced concrete is usually a cement-based composite composed of cement paste, mortar or concrete as the base material and discontinuous short fiber or continuous long fiber as the reinforcing material. Its main function is to limit the development of surrounding cracks through bridging, so as to improve the performance of concrete. Role of polypropylene fiber in cement matrix:
1. Crack resistance. Prevent the expansion of original defects (micro cracks) in cement matrix and effectively delay the emergence of new cracks;
2. Anti seepage. Improve the compactness of cement matrix by crack resistance and prevent the invasion of external water;
3. Durability. Improve the frost resistance and fatigue resistance of cement matrix and improve its durability;
4. Impact resistance. Improve the deformation resistance of cement matrix, so as to improve its toughness and impact resistance;
5. Tension. On the premise of using high elastic modulus fiber, it can improve the tensile strength of the matrix;
6. Beautiful. Improve the apparent state of cement structure to make it more dense, fine, flat and beautiful.
