Ultrasonic assessment methods on bonding level of rebar and cement-based material

To study the inherent law of bonding defects and mechanical properties between steel and cement-based materials, considering parameters of the form of rebar surface, the initial bonding defect level, the relationship between ultrasonic parameters and the initial defect was established by ultrasonic detection technology. Furthermore, static pull-out test were carried out to get the relationship between pullout force and factors including anchoring interface, steel surface. Three-dimensional finite element program ANSYS were used to conduct numerical simulation. The theoretical analysis results were compared with the experimental results. The results indicate that the results of theoretical analysis and the result has good agreement.