Experimental study and analysis on compressive and tensile behavior of basalt fibre reinforced concrete

Abstract

Blending a certain proportion of basalt fiber into concrete improves the toughness of concrete, which enhances the tenacity and prevents cracking, thus avoiding the brittle behaviors of concrete. In this paper, the compressive and tensile tests of the concrete with different basalt fiber contents were carried out. Then, the test phenomena, failure modes, and mechanical properties were compared and analyzed to derive the relationship between the basalt fiber contents and the mechanical properties. The results showed that the improvement effect of the basalt fiber on the compressive strength of concrete was lower than that of tensile strength. When the basalt fiber content is 0.3% and 0.4%, the improvement effect was the highest. In the meanwhile, the correlation coefficient of the fiber physical and mechanical parameters and content was introduced to establish the calculation formula for the crack width of basalt fiber reinforced concrete. Finally, the toughness and crack resistance performance of basalt fiber concrete were evaluated by the fracture energy and characteristic length proposed by Hillerborg. The results showed that basalt fiber can significantly improve the toughness and crack resistance performance of concrete.