Compressive-tensile Properties and Hybrid Effect of Fiber Self-compacting Concrete

Fiber self-compacting concrete (SCC) specimens were prepared by mixing basalt fiber (BF) and polyacrylonitrile fiber (PAN) with different contents in SCC. The strength test of fiber SCC specimens after standard curing for 28 d was carried out to study the influence of the content of BF and PAN on the compressive and tensile properties of SCC, and explore the microstructure of fiber SCC and the hybrid effect of fibers. The results show that the incorporation of BF and PAN can improve the compressive strength of SCC, and the improvement effect of splitting tensile strength is more obvious than that of compressive strength. The improvement effect of single fiber on the compressive strength of SCC is more obvious than that of mixed fiber, and the improvement effect of mixed fiber on the splitting tensile strength of SCC is better than that of single fiber. When the volume fraction of BF and PAN is 0.10% and 0.12% respectively, the improvement effect of fiber on the splitting tensile strength of SCC is the most obvious, which is 75.45% higher than that of SCC. The internal cracks of SCC are obvious, and the mixed fiber forms a network structure in SCC, which has a negative hybrid effect on compressive strength and a positive effect on splitting tensile strength.