Zhang, M; (2016) Service life prediction of reinforced concrete structures exposed to chloride environments – A multiscale approach. In: Proceedings of the 36th Annual Cement and Concrete Science Conference. (pp. pp. 1-4). IOM³: The Institute of Materials and Mining: Cardiff, Wales.

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Abstract

Chloride-induced rebar corrosion is nowadays the main durability concern for reinforced concrete (RC) structures serving in chloride environments. The accurate prediction of the rate of chloride ingress into concrete and service life of RC structures can have enormous social and economic impacts. Chloride transport in concrete is a rather complicated process due to the chemical reactions between chlorides and cement matrix, i.e. chloride binding, and the complex microstructure of concrete, which is random over a wide range of length scales, from micrometres (pore) to centimetres (aggregate). This paper presents a multiscale modelling framework for estimating the chloride diffusion coefficient of concrete and service life of concrete structures that accounts for both changing microstructure due to cement hydration and chloride binding, and environmental conditions. A case study is presented to demonstrate the potential of the proposed multiscale modelling scheme for service life prediction. The multiscale simulations are validated with experimental data.

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