Performance evolution of prestressing anchor bars in corrosive environments experimental study

In order to explore the performance evolution of prestressed anchor cables in corrosive environment, the corrosion immersion and corrosion damage performance tests of prestressed anchor bars in corrosive environment were carried out indoors. Based on the experimental results, the effects of stress level, pH and time on the corrosion process of prestressing anchor bars, the amount of corrosion per unit length and the change of mechanical properties were analyzed. It was found that the greater the stress level in the three corrosive media, the more severe the corrosion of the anchor bars, especially in acidic solutions; at the beginning of corrosion, prestressing anchor bars corrode fastest in neutral solution, followed by acidic and slowest in alkaline, with the continuation of corrosion, the degree of corrosion damage to anchor bars by acidic solution is more obvious; The corrosion damage of anchor tendons reflected by the corrosion amount per unit length is uniform corrosion, and local corrosion will aggravate the degree of corrosion damage of prestressing anchor tendons; The longer the corrosion time, the more serious the corrosion of anchor bars, and the 2 mechanical indexes of anchor bar elongation and fracture load have a significant decreasing trend.