Comparison of Cast-in place Pullout Anchor Pullout Capacity to Post- Installed Concrete Drill Model and Drill Bit Extractor Concrete (DBEC) Model

Cast-in-place is the anchor’s installation method where the anchors are installed together with the casting of the concrete, while post-installed is the method of installing the anchors after the concrete has hardened, namely by drilling holes in the concrete with a concrete drill and then injecting the holes with chemical epoxy paste then immersing the anchors to the holes. In general, concrete drilled holes will produce a plain concrete surface, while drill bit extractor concrete (DBEC) will produce screw-textured concrete holes which are expected to increase the pullout capacity of the post-installed anchor. The pullout capacity test of cast-in-place, post-installed, and post-installed (DBEC) anchor studs 12x160 mm anchors planted with various depths (h ef ) of 70 mm, 80 mm, 90 mm, and 100 mm injected with chemical epoxy paste in the borehole concrete and drill bit extractor concrete (DBEC). The pullout capacity of the post-installed with drilled holes concrete (concrete drill model) and pullout capacity drill bit extractor concrete (DBEC) will be compared with the pullout capacities of cast-in-place and post-installed concrete with drilled holes. The result of the study showed that the pullout capacity of cast-in-place increased by 64.05% compared to theory, the pullout capacity of the post-installed concrete drill model increased by 68.23% compared to theory, and the pullout capacity of post-installed DBEC increased by 71.51% compared to theory while the pullout capacity of post-installed concrete drill model increased by 11.64% compared to the pullout capacity of cast-in-place and pullout capacity of post-installed DBEC increased by 20.75% compared to pullout capacity of cast-in-place while the pullout capacity of post-installed DBEC increased by 10.3% compared to the pullout capacity of the post-installed concrete drill model. The results of the t-test pullout capacity increased significantly for all variations of anchor h ef depth and anchor installation methods.