Polypropylene short fiber is also called PP microfiber, its melting point is 160-180℃, the length of each fiber is roughly 3-20mm, the fiber in the concrete is three-dimensional chaotic phase dispersion, for concrete in the plastic stage and hardening stage of different states, according to their own characteristics play different roles, withstand the mortar dry shrinkage generated by tensile stress, Prevent the generation and development of cracks, reduce the generation of cracks on the surface of concrete.

The main function of polypropylene staple fiber is to improve the crack resistance and impermeability of mortar. Improve freeze-thaw resistance, increase friction resistance, resistance to shrinkage and cracking, and increase permeability, due to these characteristics of polypropylene short fiber, especially to reduce the brittleness of concrete, enhance toughness, help to improve the kinetic energy absorbed by the concrete structure when the impact, and which mortar under static stress, after millions of repeated use, still maintain a good state. So it is often used in large buildings and buildings with more irregular shapes

In addition to the application of polypropylene staple fiber in the construction industry, the application of road construction, river DAMS, tunnels, etc., is also relatively common. Because it can strengthen the civil engineering of the soft land base (such as DAMS, reservoirs, railways, etc.), and distribute the bearing capacity evenly on the geotextile, so that the subgrade settlement is uniform and the ground cracks are reduced. Secondly, when building the slope, it can reduce the slope collapse, shorten the construction period and extend the service life of the slope.

Polypropylene fiber can be used as a filling material for concrete, plaster, etc., to improve the impact resistance, water resistance and heat insulation of concrete. Because the fiber prevents the chemical corrosion of the reinforcement inside the concrete, prevents the generation of macroscopic cracks, reduces the number of cracks inside the concrete, improves the impact resistance of the concrete and a series of optimization indicators, comprehensively improves the durability of the concrete, so the frequency of use in large-scale projects is higher.