FRACTURE MECHANICS APPROACH TO EVALUATE BOND PROPERTIES OF CRACK INJECTION REPAIR

Abstract

The influence of surface properties and specimen size on the flexural failure of concrete beams repaired by crack injection techniques is evaluated by using tension softening diagrams and fracture energy. Fracture energy is an effective index to evaluate the differences in fracture behavior between rough and smooth repair surfaces. The size effect on the flexural strength of repaired specimens is larger than that of plain concrete. In addition, weak boundary layers adjacent to the repair surface adversely affect the cracking behavior of repaired specimens.