Time Development of Chloride Diffusion Coefficients for Concrete Exposed to the Marine Environment

Author(s): Rukshani Heiyantuduwa and Mark Alexander
Paper category: Proceedings
Book title: Proceeding of the 71st RILEM Annual Week & ICACMS 2017
Editor(s): Manu Santhanam, Ravindra Gettu, Radhakrishna G. Pillai, Sunitha K. Nayar
ISBN:978-2-35158-195-7, 978-2-35158-190-2 (Set)
e-ISBN: 978-2-35158-191-9
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 369-374
Total Pages: 6
Language : English

Abstract: A large number of concrete structures in marine environments show signs of deterioration due to chloride-induced corrosion of the reinforcement. The rate of chloride ion ingress into concrete is of great importance for the performance of reinforced concrete structures exposed to chloride-contaminated environments. The service life of reinforced concrete structures subjected to such exposure conditions is therefore closely related to the rate of chloride ion diffusion through the concrete. Chloride ingress into concrete is commonly characterised by measuring a diffusion coefficient, which is considered the rate-determining parameter of the process. This paper looks at the time development of chloride diffusion coefficients of concretes made with different binder types exposed to varying marine exposures in a South African marine environment. Chloride profiles analysed from site samples showed the expected linear double logarithmic relationship, allowing the development of the diffusion coefficient to be written as a power function. The variation of the diffusion coefficient with time depends on several factors, the most important being the w/c ratio of the mix, and the cement type and content.

Online publication :2017
Publication type :full_text
Public price (Euros) : 0.00

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