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Research Articles

Combined use of non-destructive tests, visual inspection and service life prediction to ensure the reliability of reinforced concrete water tanks

Authors:

K. Ranasinghe,

National Water Supply & Drainage Board, Galle Road, Ratmalana, LK
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S. De Silva

University of Ruhuna, LK
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Department of Civil and Environmental Engineering, Faculty of Engineering
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Abstract

Corrosion of reinforcement is the most significant cause of premature deterioration of reinforced concrete structures. Many of the concrete structures have been exposed to aggressive environments, suffer from durability problems, and fail to fulfil their design service life requirements. Chlorideinduced corrosion is one of the deterioration mechanisms that may reduce the service life of reinforced concrete structures. The condition assessment of a reinforced concrete structure over a period of time is useful with routine monitoring. The majority of water supply systems have some form of water storage tanks, most often constructed from reinforced concrete. These tanks are an integral part of the potable water distribution network. To ensure durability and sustainability, they should be adequately inspected and maintained. For effective and durable repairing or retrofitting of reinforced concrete tanks, the use of a suitable condition assessment system may give more sustainable results. This study aimed to propose a system to perform a condition assessment of existing reinforced concrete water retaining structures. The reinforced concrete tanks were selected in Galle, Matara, and Hambanthota districts in Sri Lanka, to perform visual inspections and non-destructive tests. The service life of reinforced concrete structures in marine environments depends on chloride-induced corrosion. Therefore, the development of the chloride penetration model is essential for its assessment. Fick’s Second Law of diffusion provides a simple way to predict the chloride penetration in such situations. Therefore, an analytical method is introduced to predict the service life of reinforced concrete water retaining structures taking into account well-known corrosion models such as Fick’s Second Law and the Bazant model. Both the predicted service life and the tank soundness score can be used to develop a tank remediation plan more effectively. Therefore, the repair / retrofitting methods proposed based on such assessment will be cost-effective as well as more reliable in enhancing the service life of the water retaining structures. However, modelling the service life of reinforced concrete structures

How to Cite: Ranasinghe, K. and De Silva, S., 2022. Combined use of non-destructive tests, visual inspection and service life prediction to ensure the reliability of reinforced concrete water tanks. Journal of the National Science Foundation of Sri Lanka, 50(2), pp.371–386. DOI: http://doi.org/10.4038/jnsfsr.v50i2.10474
Published on 09 Sep 2022.
Peer Reviewed

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