Research on the Development of Low-temperature-resistant Fast-curing Structural Adhesive and Steel Plate Strengthening Concrete Beam Flexural Test

Steel plate strengthening method is a common, efficient, and mature reinforcement method that utilizes structural adhesive to bond steel plates with concrete components to work together. It takes advantage of the excellent tensile strength of steel plates to improve the mechanical properties of the original structure. However, epoxy-based structural adhesives are highly sensitive to the environment, and curing effect at low temperatures is a key issue. This study developed a low-temperature-resistant fast-curing structural adhesive (LTR-FCA) that can achieve rapid curing at low temperatures of -5 °C. The flexural performance of reinforced concrete beams strengthened with steel plates using LTR-FCA was compared with that using Normal Structural Adhesive (NSA). Experimental results indicated that LTR-FCA could rapidly cure at a low temperature of -5°C. Compared to NSA, which cures at room temperature, the use of LTR-FCA effectively delayed the debonding of the steel plates.