Abstract
This study develops a classification method to understand the relationship between the interfacial bond strength and the surface finish of newly added concrete to old. An experimental program is developed to evaluate the interfacial bond strength between new and old concrete with a various degree of surface finishes. Water jet technology is used to treat the finished surface of the old concrete. The degree of surface finish is determined by the exposure time and the number of repetitions under constant pressure. Each surface finish is analyzed by a 3D scanner focusing on indentation. A sufficient number of images is obtained to develop the classification scheme. The interfacial bonding strength is obtained by testing standard three point bending specimens with two prefabricated interfacial cracks. These specimens are tested to failure in a Mode I fracture only. The results indicate that bonding is improved with the degree of finish up to a peak value that is the optimal finish. Also, the study shows that the strain energy release rate for each surface finish remains to be constant and independent of the of the initial crack length.
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