Bond Slip Behavior of Grout-Filled Concrete Members with Different Interface Materials

The present paper investigates the relationship between pressure (bond stress) and displacement at the failure load for different materials through testing and modeling. First, single-end tests were conducted on prebonded stressed and perforated concrete specimens with corrugated plastic, metal, and rubber extractive pipes. These tests reveal that corrugated plastic pipes provide good bonding performance with concrete and grout. Hence, they can be applied in the hole-forming process of posttensioned prestressed bonded structures, along with corrugated metal pipes and rubber extractive pipes. Based on the experimental observations and results, a theoretical approach for applying corrugated plastic pipes in projects such as China's high-speed rail has finally been demonstrated.