Experimental investigation on post-installed adhesive anchors in concrete under tension and shear loads

One of the most widely used techniques in the rehabilitation of concrete structures is the application of post-installed adhesive anchors in concrete. The main purpose of this study is to evaluate the efficiency and safety of post-installed adhesive anchors under domestic Iranian workshop conditions. This study focuses on the effects of parameters such as adhesives used in Iran, embedment depth, edge distance, and either single or group behavior of post-installed anchors on both reinforced and plain concrete members. The design procedure is in accordance with ACI 318-19 guidelines. For this purpose, eight tension and eight shear tests were performed on post-installed adhesive anchors in reinforced and plain concrete members to evaluate the types of failure and the factors affecting its behavior. The results show that by increasing embedment depth and distance from the edge of the concrete member, respectively, both tensile and shear capacities increase. In group installation, by reducing the rebar spacing, the nominal bond strength between adhesive and concrete decreases due to the initiation of cracks between two rebars. Finally, the comparison of experimental results with ACI 318-19 equations showed that the code predicts the tensile and shear failure capacities with safety factors of at least 1.5 and 2, respectively.