Effect of CFRP Confinement on AAR-Induced Expansion of Concrete Columns
Abstract
The effect of the alkali-aggregate reaction (AAR) in concrete, which has an adverse effect on its durability. In order to extend concrete’service life-span it is necessary to find a novel material to reduce or limit AAR-induced expansion and improve the strength capacity of the affected concrete. Carbon fibre reinforced polymers (CFRPs) are one of several materials used to rehabilitate affected concrete members. Twenty circular concrete columns 200 mm in diameter and 500 mm in height were cast from reactive (AAR) concrete. During six months of storage at 38º C and 98% relative humidity, several ages of 15, 30, 45, 60, 90 and 120 days after casting to represent different levels of expansion during AAR development were selected to confine the affected columns using CFRP composites. Strain behaviour in concrete and steel were monitored, before and after confinement, for different wrapping times. The results indicate the efficiency of using CFRP to reduce the rate of expansion in both steel and concrete. The results show also show that the efficiency of reducing AAR-induced expansion depends on the time of wrapping and the number of CFRP layers applied to the affected columns
Downloads
References
Curtil, L., Ferrier, E., Ronel-Idrissi, S. and Hamelin, P. (2003). Composite materials contribution in strengthening concrete structures affected by alkali-aggregate reaction. International Journal of Materials and Product Technology, 19, 68-82.
Mohamed, I., Curtil, L., Ronel-Idrissi, S. and Hamelin, P. (2005). Influence of composite materials confinement on alkali aggregate expansion. Materials and Structures/Materiaux et Constructions, 38, 387-394.
Mohamed, I., Ronel, S. and Curtil, L. (2006). Influence of composite materials confinement on alkali-aggregate mechanical behaviour. Materials and Structures/Materiaux et Constructions, 39, 479-490.
Pelletier, H. and Labossire, P. (2007). Effect of a FRP confinement on the behaviour of concrete cylinders damaged by alkali-aggregate reactions. Annaual Conference of the Canadian Society for Civil Engineering (pp.21-30), Yellowknife, Northwest Territories, Canada.
Fuji, M., Kobayashi, K., Kojima, T., Adachi, Y. and Kurihara, S. (1996). An experimental study on strengthening ASR-damaged reinforced concrete members with carbon fiber sheet. Proceedings of the 10th International Conference on Alkali-Aggregate Reaction in Concrete (ICAAR) (pp.1041-1048), Melbourne, Victoria, Australia.
Abdullah, S., Al-Mahaidi, R. and Shayan, A. (2010). CFRP confinement of RC columns damaged by alkali aggregate reaction. In: Proceedings of the 5th Civil Engineering Conference in the Asian Region and the Australasian Structural Engineering Conference (pp.773-778), Sydney, N.S.W, Australia.
Shayan, A., Xu, A. and Salamy, R. (2012). Confinement of AAR in cylindrical reinforcement columns by CFRP wrapping. Proceedings of the 14th International Conference on Alakli Aggregate Reaction in Concrete (ICAAR) (pp.11), Austin, Texas, USA, May 20-24.
Shayan, A., Xu, A. and Salamy, R. (2009). Effectiveness of CFRP wrapping in confining the expansion of AAR-affected concrete. In: Austroads 7th Bridge Conference, Auckland, New Zealand, May 24-26.
It is the policy of the Journal of Duhok University to own the copyright of the technical contributions. It publishes and facilitates the appropriate re-utilize of the published materials by others. Photocopying is permitted with credit and referring to the source for individuals use.
Copyright © 2017. All Rights Reserved.