Affiliation:
1. Department of Civil Engineering, Qilu Institute of Technology, Jinan, China
2. Department of Civil Engineering, Qingdao University of Technology, Qingdao, China
Abstract
Concrete is a typical brittle material. Although it has excellent compressive performance, its shortcomings such as poor tensile strength and easy cracking cannot resist the damage of dynamic loads such as explosion and impact to a certain extent. In order to improve the impact resistance of concrete, the φ100 × 50 SHPB was used to carry out the impact tests of high-strength concrete specimens with volume contents of 0.1%, 0.3%,0.5% basalt fiber (BF) and polypropylene fiber (PPF) under three different impact pressures. The compressive strength, splitting tensile strength, flexural strength and dynamic compression performance of basalt/polypropylene fiber high strength concrete (C60) were studied. With the increase of impact pressure, increasing the volume content of fiber can significantly improve the impact resistance of high-strength concrete, which can give full play to the crack resistance and bridging effect of fiber. BF and PPF are sensitive to strain rate. Within a certain range of strain rate, the relationship between peak stress and strain rate is positively correlated. Finally, the dynamic stress-strain curves of the optimal content of two kinds of fibers are obtained through dynamic compression test.