Fatigue characteristics and mechanical evaluation of basalt fiber reinforced composite material concrete under freeze-thaw cycles

Fatigue failure of concrete under action of freeze-thaw cycles and repeated loading posess a critical challenge seasonally frozen soil regions, and concrete reinforcement technology offers a viable solution to this issue. However, based on current research results, BFRP, as a relatively young member of FRP materials, has not been fully studied in the field of interfacial bonding. This study emphasizes the importance of concrete fatigue resistance in seasonally frozen regions and aims to provide a theoretical basis for the practical application of BFRP-reinforced concrete therein. In this work, BFRP was employed in concrete reinforcement technology, and the fatigue characteristics of BFRP-concrete under freeze-thaw cycles were evaluated through double shear tests and finite element analysis. The test results demonstrated that freeze-thaw damage gradually propagated from the concrete surface to the interior, and the thickness of concrete layer peeled off by the adhesive layer decreased progressively with freeze-thaw cycles increasing. Double shear test results showed that the interfacial shear strength of BFRP-concrete decreased by approximately 46.86% after 200 freeze-thaw cycles. Then, finite element analysis further revealed that freeze-thaw cycles exerted the larger adverse impact on the fatigue life of BFRP-concrete than stress amplitude.