Study on the durability and mechanical properties of carbon fiber reinforced concrete for shaft lining under chloride salt freeze–thaw coupling environment

Deep mining shaft lining concrete structures face durability challenges due to long-term exposure to complex environments. This study investigates the mechanical properties and degradation mechanisms of carbon fiber reinforced concrete (CFRC) under combined chloride erosion and freeze-thaw cycles. Tests were conducted to compare CFRC with ordinary concrete (OC), focusing on static and dynamic mechanical performance. Results indicate that CFRC with an optimal carbon fiber content exhibits significantly improved comprehensive properties, including enhanced compressive and splitting tensile strength. Although concrete mechanical properties generally decline with increasing freeze-thaw cycles, CFRC demonstrates superior resistance to chloride penetration and freeze-thaw damage compared to OC. The findings confirm carbon fiber's effectiveness in mitigating deterioration in harsh environmental conditions.