Author(s)

Zheng Liang

Corresponding Author

Zheng Liang

Abstract

Because ordinary concrete is easy to crack and has poor toughness, the impact test of concrete is mainly used to study the addition of synthetic polypropylene fibers and polyacrylonitrile fibers of different lengths to ordinary concrete to improve the brittle properties of concrete and improve the toughness of concrete. Statistical analysis of the initial crack strength and fracture strength of steel-polypropylene hybrid fiber reinforced concrete (SPHFRC) and steel fiber reinforced concrete (FRC) test pieces after impact shows that the average initial crack strength and fracture strength of SPHFRC are higher than those of FRC . Large; the covariance of the 2 samples of FRC and SPHFRC is much greater than 15%. The effect of synthetic fibers on the impact toughness of concrete was studied. The impact energy of fiber-single-mixed, fiber-mixed and layer-distributed steel fiber lightweight aggregate concrete was tested respectively. The test results show that the incorporation of fiber improves the impact energy of lightweight aggregate concrete, and the effect of steel fiber is the most obvious, followed by fiber blending; when the content of steel fiber is 2 %, the impact energy value is the highest 3.16 times that of concrete. The purpose of this paper is to study the influence of fiber type and content on the impact resistance of concrete, and to explore the influence of new synthetic fiber materials on the impact resistance of concrete.

Keywords

Synthetic fiber; Concrete; Impact resistance