In order to explore the frost resistance durability of basalt fiber reinforced concrete (BFRC), the freeze-thaw cycle tests of BFRC with different fiber contents were carried out from the microscopic point of view, and the macro-morphological deterioration characteristics and micro-morphological characteristics of BFRC with different freeze-thaw cycles were analyzed. By testing the hole structure parameters of BFRC with different freeze-thaw cycles, the effects of gas content, average bubble chord length, specific surface area, and bubble spacing coefficient on the frost resistance of BFRC were studied. The results show that: With the increase of fiber content, the damage degree of concrete specimens weakens, and the proportion of harmful pores in the pore size distribution increases significantly; It decreases with the increase of bubble spacing coefficient; The addition of basalt fiber can effectively inhibit the development of cracks and reduce the probability of large pores in the process of concrete freeze-thaw damage, thereby improving the frost resistance of concrete. Therefore, for the northern region, the research on the frost resistance of BFRC is very necessary and of great significance.
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