A new set-up for FRP-concrete stable delamination test

Results of an experimental campaign on FRP – concrete delamination are presented. Two specimens have been tested by using a particular experimental set-up where a CFRP plate has been bonded to concrete and its back side fixed to an external restraining system. The adopted set-up allows a stable delamination process and transition between two limit states (perfect bonding and fully delaminated plate) to be observed. Both strain gages along the FRP plate and LVDT transducers have been used. Starting from experimental data, shear stress – slips data have been computed. A non linear interface law has been calibrated and compared with analogous results obtained by a more conventional experimental set-up. A numerical bond – slip model has been used, adopting the above mentioned law for the FRP – concrete interface to simulate experimental tests. Numerical results are found to be in good agreement with experimental results.