A QUASI NON-DESTRUCTIVE TEST TO STUDY ENVIRONMENTALEFFECTS ON THE SHORT TERM BOND OF CFRP COMPOSITES TO CONCRETE STRUCTURE

摘要

CFRP sheets and strips are being used to strengthen waterfront concrete structures such as piers and wharves. The CFRP reinforcements are bonded to beams, piles, and decks using structural adhesives. Adhesive strength can be affected by both short-term and long-term environmental exposure. Short-term effects of temperature and moisture on the CFRP adhesion were evaluated using pull-off tests. Three structural adhesives were chosen to establish the effects of three different temperatures and four different relative humidity. It was shown that high relative humidity may reduce bond strength below acceptable levels.