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research article

Towards a two-step assessment of the chloride ingress behaviour of new cementitious binders

Wilson, William  
•
Georget, Fabien  
•
Scrivener, Karen L.  
October 1, 2024
Cement and Concrete Research

A wide range of systems were exposed to a seawater-like chloride concentration (0.5 M Cl−) for bulk diffusion experiments over 0.5, 1 and 4 years. Combined with previously published findings on chloride binding and mini-migration testing, the results showed that chloride ingress into saturated blended cement pastes is a diffusion-governed process, obeying the square root-law or a modified version including an offset to account for slow microstructure changes. Chloride ingress is also strongly correlated with bulk electrical conductivity, suggesting a negligible effect of chloride binding variations between the systems studied. These findings support a two-step approach to rapidly characterise the chloride ingress behaviour of new binders at the cement paste scale. A screening with bulk conductivity measurements investigates promising binders and the kinetics of their diffusion properties. In a second step, bulk diffusion tests and the square root law with an offset are used to predict chloride ingress.

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10.1016_j.cemconres.2024.107594.pdf

Type

Main Document

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openaccess

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CC BY

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2.95 MB

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Adobe PDF

Checksum (MD5)

27a9d4d548f1b5b0f986dff07b6451d2

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