Effect of hybrid basalt-brucite fibers in the microstructure of low heat cement concrete

Abstract In this paper, the mechanical properties and microstructure of hybrid basalt-brucite fibers reinforeced low heat cement concrete were investigated, including compressive strength, splitting tensile strength, hydration products, microstructure, and pore. The results showed that the composite effect of hybrid fibers can effectively improve the mechanical properties of low heat cement concrete and affect the failure mode of specimens. Based on microscopic techniques, it was found that hybrid fibers had a good bonding effect with the mortar. The failure mode of hybrid fibers in mortar included pull-out, tensile failure, and torsional failure. Meanwhile, mineral fibers can effectively promote hydration reaction, enhanced the interface transition zone between fibers and concrete, and improve the compactness of concrete by compensating for small pores in concrete. Based on the theory of composite materials, the reinforcement mechanism of hybrid fibers on low heat cement concrete was elucidated.