No abstract

The aim of this work is to develop a reliable and confident non-destructive testing technique by means on infrared thermography. In particular, pulse heating thermography and lock-in thermography as a tool for the evaluation of hidden defect in FRP-reinforced concrete structures were examined. The study on a concrete sample strengthened with externally bonded FRP (Fiber Reinforced Plastic) sheets, with known defects appropriately applied at the FRP-concrete interface, is presented. The results obtained with both procedures are compared.