EXPERIMENTAL STUDY ON TENSILE PERFORMANCE OF DEFECT DETECTABLE AND REPAIRABLE HALF GROUTED SLEEVE CONNECTION

To solve the problem of detecting and repairing defects of constructed grouted sleeve, a defect detectable and repairable half grouted sleeve (referred to as DDRHGS hereafter) is proposed. To investigate the tensile performance of the connection using DDRHGS and validate the reliability of its repair function, 26 groups with 78 specimens were tested under uniaxial tensile load. Numerous factors were comprehensively considered, including with or without grouting defects, grouting defect ratio, with or without repair, material used to repair, and diameter of the rebar. Test results indicate that the specimens without defects exhibit a good tensile performance and meet the requirements specified in relevant codes. Grouting defect ratio has significant influence on the corresponding tensile performance. A higher defect ratio will lead to the bond-slip failure mode, and the tensile capacity as well as deformation capacity of such specimens can not meet the requirements in codes. The defect repairing function of DDRHGS is overall proved to be reliable. The 48 repaired specimens all exhibited the desirable failure mode, and correspondingly, the tensile capacity and deformation capacity were basically identical with those of specimens without defects. Grout and epoxy mortar can both be used as the repairing material to ensure the repair quality.