Insight into the Mechanical Performance of the TRECC Repaired Cementitious Composite System after Exposure to Freezing and Thawing Cycle

Concrete structures are subjected to various forms of damage in cold regions. However, the interfacial bonding properties of traditional concrete (NC) reinforced with textile-reinforced cementitious composite (TRECC) under freeze–thaw cycle damage have not been fully studied. In this paper, different control groups were obtained by adjusting the types and layers of Fiber Reinforced Plastics (FRP) in TRECC and the interfacial roughness level between TRECC and NC. After experiencing 0–300 freeze–thaw cycles, each group underwent the uniaxial tensile test, three-point bending test, and scanning electron microscope observation. The results show that FRP type in TRECC can determine the strength of specimens. After 100 freeze–thaw cycles, the ultimate tensile strength of TRECC with two different FRP types increased by 38.4% and 55.3%, respectively, compared with TRECC. Furthermore, the bond strength and resistance to freeze–thaw damage of TRECC-NC interface increased with the increase of roughness under the action of freeze–thaw cycles. After 100 freeze–thaw cycles, the bonding strength of the repair system reached the highest. Compared with 0 freeze–thaw cycles, the ultimate tensile strength of the TRECC-NC reinforcement system under low roughness and high roughness increased by 50.05% and 61.25%, respectively. Meanwhile, the internal cracks of TRECC gradually developed and penetrated, reducing the cooperative working ability between TRECC-NC.

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