Impacts of high temperatures on hybrid basalt-polypropylene fiber-reinforced concrete's mechanical property

Abstract

The mechanical properties of hybrid basalt-polypropylene fiber-reinforced concrete (HBPFRC) in high-temperature environments are investigated. First, the physical properties of basalt fiber (BF) and polypropylene fiber (PF) are analyzed. According to fiber's characteristic of enhancing concrete's properties, BF and PF are blended into concrete to enhance its temperature resistance. Second, the optimal blending proportions for compressive strength, tensile strength, and flexural strength are found by testing HBPFRC's mechanical properties with various BF and PF blending proportions. Then, HBPFRC's mechanical properties after high-temperature are tested. Experimental results demonstrate that given 0.15% BF and 0.025% PF, HBPFRC's CS increases by 14%, TS and FS increase by 52% and 25.8%, respectively. The high-temperature test suggests that temperature rise will cause the mechanical property of HBPFRC to rise briefly and then drop sharply. Also, Cooling methods affect HBPFRC's mechanical properties as well. The above results can provide a reference for researching high-performance concretes.