Time-dependent bond behavior between NSM CFRP strips and concrete

Abstract

Although some studies have been carried out to understand the long-term bond performance of concrete structures strengthened with Near Surface Mounted (NSM) Fiber Reinforced Polymers (FRPs), which is being considered an important design aspect of safe design, there is still more effort required. This work presents an experimental campaign to investigate the effect of sustained load, bonded length and groove width on the time-dependent behavior of concrete strengthened with NSM CFRP strips. Single shear pull-out tests have been carried out. Both instantaneous and time-dependent slip values were found to be affected by the investigated parameters, and the increase of slip due to bond deterioration was more accentuated in those specimens loaded at 50% of sustained load than those at 25%