On an Intelligent Structure of Concrete Reinforced by CFRP.

Abstract

An intelligent structure of concrete reinforced by CFRP which can detect and repair the delamination of CFRP from the surface of concrete has been proposed and the performance has been evaluated in this paper. In order to investigate the effect of repair, three-point bending test has been performed on the test piece. When the optical fiber sensor detects the delamination during the test, the processor judges the damage to be repaired. The embedded Ni-Cr wire is heated to release the epoxy resin in the capsule, it spreads into the delamination to adhere the damage. The result of three-point bending test after repair showed better performance than that of a specimen of non-repaired. In case the repair was delayed, however, reasonable repairing cannot be expected. Therefore, delamination must be detected and repaired in the early stage of fracture. As a result, it was recognized that the delamination of CFRP on mortar concrete can be repaired with the proposed system.