Study on antifreeze Properties and pore structure of Basalt Fiber Reinforced Concrete

Abstract We designed basalt fiber concrete with a volume content of 0.05%, 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, 0.35%. Through the mass loss rate and dynamic modulus loss rate after different freezing-thawing cycles, the antifreeze performance of concrete was tested. As the internal capillary pores of concrete are the main channel for corrosive medium and other harmful substances to invade the internal concrete, the durability of concrete is closely related to the internal pore structure. The microstructure and pore structure of basalt fiber concrete were tested by sem and Mercury Injection Apparatus, so as to analyze the microstructure of the interface between fiber and cement and discuss the strengthening mechanism of basalt fiber concrete. The results indicate that the basalt fiber can improve the freeze-thaw cycle of concrete With the increase of the content of basalt fiber, the gel has greater adhesion and binding force to basalt fiber, and the hydration products attached to the surface of basalt fiber gradually decrease When the content of basalt fiber is 0.3%, the frost resistance of concrete is the best. The addition of basalt fiber optimizes the hole structure and reduces the internal defects of concrete, thus improving the durability.