Monitoring of strain development in CFRP-wrapped concrete columns damaged by alkali aggregate reaction


Kubat, T.; Al-Mahaidi, R.; Shayan, A.


Alkali-aggregate reaction (AAR) is known to cause expansion and cracking in concrete, which can lead to deterioration of the affected structures. Wrapping the damaged elements with epoxy-bonded carbon fibre reinforced polymer (CFRP) is a method of rehabilitation of such elements. A number of columns of specified dimensions (200 mm in diameter and 500 mm high) were fabricated from reactive concrete, using fused silica and additional alkali in the ingredients. The columns were stored in a chamber under storage conditions of 38°C and relative humidity of 98%. At different periods during the AAR process representing different times after casting (15, 30, 45, 60, 90 &, 120 days), external confinement using CFRP was applied. The main objective of using CFRP as a confinement material is to reduce the effect of the AAR-induced expansion on the concrete. Results indicate that the efficiency of reducing AAR expansion depends upon the time of CFRP wrapping and on the number of CFRP layers applied to the column.

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Conference paper


Joint Conference of the 12th International Symposium on Fiber Reinforced Polymers for Reinforced Concrete Structures (FRPRCS-12) and the 5th Asia-Pacific Conference on Fiber Reinforced Polymers in Structures (APFIS-2015), Nanjing, China, 14-16 December 2015


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