Document Type

FRP-strengthened and all-FRP structures paper

Publication details

Kubat, T, Al-Mahaidi & Shayan, A 2014, 'Effect of CFRP wrapping time on rehabilitation of concrete damaged by alkali aggregate reaction', in ST Smith (ed.), 23rd Australasian Conference on the Mechanics of Structures and Materials (ACMSM23), vol. I, Byron Bay, NSW, 9-12 December, Southern Cross University, Lismore, NSW, pp. 471-476.. ISBN: 9780994152008.

Peer Reviewed

Peer-Reviewed

Abstract

Alkali aggregate reaction (AAR) is a chemical reaction between alkali in the pore solution of cement paste and reactive forms of silica in the aggregate, which can reduce the durability and mechanical strength of concrete. Carbon fibre-reinforced polymer (CFRP) is one of several techniques used to rehabilitate concrete affected by AAR. Fused silica was used as fine aggregate at the replacement rate of 7.5% of the total aggregate in the mix ingredients of concrete to simulate reactivity. During the expansion process of the reactive concrete, three different times, representing three levels of expansion were selected for wrapping the affected concrete with CFRP. This paper investigates the effect of the level of expansion of reactive concrete on the mechanical properties of concrete. It also investigates the effect of wrapping and testing time on the efficiency of CFRP to confine concrete damaged by AAR. The results indicate that wrapping at low levels of expansion could more effectively limit the effect of AAR and improve the strength and ductility of affected concrete.

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