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Application of carbon fibre reinforced polymer (CFRP) composites in strengthening of existing reinforced concrete (RC) structures has been widely accepted. However, the durability of adhesively bonded CFRP-concrete joint has not yet been fully investigated, which therefore paves the way to the topic addressed in this work: the durability of the joint in concrete elements strengthened with CFRP laminate using externally bonded reinforcement (EBR) technique. Concrete strengthened elements were kept in laboratory-controlled environments (approximately 20 °C/55 % RH, and water immersion at 20 °C), while others were kept outdoor to mainly promote natural ageing by carbonation, high temperatures, freeze-thaw attacks, and airborne chlorides. The results from durability tests after 4 years of exposure showed insignificant bond strength degradation but with a noticeable bond stiffness reduction, also, the stiffness degraded faster than the strength. Besides, environmental conversion factors of 0.75 and 0.95 were derived from a database of existing accelerated ageing test data and the natural ageing test data from the present work, respectively.
Dushimimana et al. (Wed,) studied this question.
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