Polypropylene engineering fibers are widely used in road paving. Why do we need to add polypropylene engineering fibers to concrete and how does polypropylene engineering fiber affect concrete?

The improvement of the performance of polypropylene engineering fibers includes: by reducing the bleeding of concrete, the surface concrete quality can be improved, so that the abrasion resistance of concrete can be improved, and the crack resistance effect can significantly improve the anti-leakage performance of concrete. Wait. Polypropylene engineering fibers also have no adverse effect on other durability indexes of concrete, such as permeation resistance, frost resistance, salt freeze resistance, chemical resistance, etc., but the degree of improvement needs further study.

1 Polypropylene engineering fibers can eliminate or reduce the number and dimensions of primary fissures in concrete. This effect not only can effectively prevent plastic cracking of concrete, but also is very beneficial to the performance of hardened concrete.

2 Polypropylene engineering fibers can not significantly improve the quasi-static strength of hardened concrete. However, by improving the impact resistance and fatigue resistance of concrete, the use performance of concrete for pavement bridge decks can be improved.

3Because of the differences in fiber fineness, elastic modulus and other properties, the effect and mechanism of polypropylene engineering fiber and steel fiber on the performance of concrete are different. Both have their own strengths.

4 Due to the test evaluation method, small indoor specimens can not fully demonstrate the use of polypropylene fibers in actual projects, resulting in an underestimation of the actual use of polypropylene engineering fibers.

Polypropylene engineering fibers have a significant effect on improving the durability of concrete. This function is widely respected by people.