understanding is of course correct
[2017/3/6] Clicks:[609]
Polypropylene engineering fibers are primarily materials that improve the durability of concrete. If the fatigue resistance is considered to be a durability indicator for pavement concrete, the above understanding is of course correct. In addition, the improved effect of polypropylene engineering fibers on concrete performance includes the improvement of the quality of the surface concrete by reducing the bleeding of concrete, thereby improving the wear resistance of the concrete and significantly improving the resistance Concrete anti-leakage performance. Polypropylene engineering fibers have no adverse effects on other durability indicators such as impermeability, freezing resistance and salt resistance, chemical resistance, etc., but the degree of improvement remains to be further studied.
① polypropylene engineering fiber can eliminate or reduce the number of concrete cracks in the concrete and scale, this effect can not only effectively prevent the plastic cracking of concrete, the performance of hardened concrete is also very useful.
(2) Polypropylene engineering fiber can not improve the quasi-static load of hardened concrete, but it can improve the performance of concrete of pavement bridge by improving the impact resistance and fatigue resistance of concrete.
(3) Due to the difference in fiber fineness, elastic modulus and so on, the effect and mechanism of polypropylene engineering fiber and steel fiber on concrete performance are different.
④ due to the reasons for the evaluation of the test method, the indoor small specimen can not fully display the polypropylene engineering fiber in the actual use of the project results, resulting in the practical use of polypropylene fiber effect of the underestimation.
