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The effects of cyclic fluid pressure on time-dependent corrosion behaviour of offshore concrete caused by chloride ions

The effects of cyclic fluid pressure on time-dependent corrosion behaviour of offshore concrete... The durability of the offshore reinforced concrete (RC) structures is influenced significantly by the chloride-induced corrosion on the reinforcement. In the present study, a numerical model was developed to access the transport behaviour of chloride within the concrete under cyclic fluid pressure induced by the rise and fall of the wave. The proposed chloride reactive transport model parameters were identified by performing a series of chloride diffusion tests. Results show that the concentration of free chloride in concrete is governed by the concentration of calcium silicate hydrate (C-S-H) on concrete pore surface and its binding affinity. In addition, it was determined that there should be an optimal aggregate volume fraction which gives the highest durability of the offshore RC structures. While aggregates limit the penetration of chloride into concrete, the increase in the interfacial transition zone of concrete could enhance the diffusion of chloride ions. Furthermore, the cyclic fluid pressure significantly increases the long-term uptake of chloride ions and reduces the time to reach its corrosion initiation threshold. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Mechanics of Time-Dependent Materials Springer Journals

The effects of cyclic fluid pressure on time-dependent corrosion behaviour of offshore concrete caused by chloride ions

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References (61)

Publisher
Springer Journals
Copyright
Copyright © The Author(s), under exclusive licence to Springer Nature B.V. 2022
ISSN
1385-2000
eISSN
1573-2738
DOI
10.1007/s11043-022-09556-x
Publisher site
See Article on Publisher Site

Abstract

The durability of the offshore reinforced concrete (RC) structures is influenced significantly by the chloride-induced corrosion on the reinforcement. In the present study, a numerical model was developed to access the transport behaviour of chloride within the concrete under cyclic fluid pressure induced by the rise and fall of the wave. The proposed chloride reactive transport model parameters were identified by performing a series of chloride diffusion tests. Results show that the concentration of free chloride in concrete is governed by the concentration of calcium silicate hydrate (C-S-H) on concrete pore surface and its binding affinity. In addition, it was determined that there should be an optimal aggregate volume fraction which gives the highest durability of the offshore RC structures. While aggregates limit the penetration of chloride into concrete, the increase in the interfacial transition zone of concrete could enhance the diffusion of chloride ions. Furthermore, the cyclic fluid pressure significantly increases the long-term uptake of chloride ions and reduces the time to reach its corrosion initiation threshold.

Journal

Mechanics of Time-Dependent MaterialsSpringer Journals

Published: Jun 1, 2023

Keywords: Offshore concrete structure; Chloride ions; C-S-H; Cyclic fluid pressure; Reactive transport

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