Abstract
Factors in the environment may cause corrosion of the anchor rod and mortar, thus degrading the mechanical properties of the anchor rod-mortar interface and eventually leading to failure of the anchor structure. In this paper, a method is designed to accelerate the migration of corrosive ions (Cl-，SO42-) from solution to penetrate the mortar, resulting in the corrosion of both the mortar and the bolt. Taking corrosion of the steel bar as the control, the deterioration law for the interfacial anchor-mortar bond during two-phase corrosion was studied. The mechanical properties deteriorating mechanism of the anchor-mortar interface was revealed based on changes in the composition and amount of corrosion products and the damage extent of anchor rods and mortars. The test results showed that, in acidic environments, the rib height of the bolt decreased due to corrosion, which led to a decrease in the mechanical bite force of the interface. The needle and rod-shaped ettringite generated by the mortar during corrosion can destroy the internal structure of mortar, promote more corrosive solution to participate in the chemical reaction, and reduce the radial binding force on the steel bar. In an alkaline environment, corrosion of the rebar is slow. The plate ettringite formed by the mortar during corrosion provides a filling effect and delays the corrosion reaction of the rebar. Corrosion of the reinforcement and mortar results in deterioration of the interface bond strength between the bolt and mortar. Based on the test results, the current model of bond slip was modified to include deterioration of the anchor and mortar material properties and weakening of the restraining effect of the mortar. A model for the anchor-mortar bond-slip relationship was proposed and included corrosion of both materials. The results of this research will provide guidance for future studies of the failure mechanisms of anchorage structures and evaluations of the durability of anchored slopes.
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