New insights into long-term chloride transport in unsaturated cementitious materials

Role of degree of water saturation

Journal Article (2020)
Author(s)

Yong Zhang (Fuzhou University, TU Delft - Materials and Environment)

G. (Guang) YE (TU Delft - Materials and Environment)

Zhengxian Yang (Fuzhou University)

Research Group
Materials and Environment
Copyright
© 2020 Y. Zhang, G. Ye, Zhengxian Yang
DOI related publication
https://doi.org/10.1016/j.conbuildmat.2019.117677
More Info
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Publication Year
2020
Language
English
Copyright
© 2020 Y. Zhang, G. Ye, Zhengxian Yang
Research Group
Materials and Environment
Bibliographical Note
Accepted Author Manuscript@en
Volume number
238
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Abstract

Concrete is rarely saturated. Reliable durability design of marine concrete structures requires a solid understanding of the long-term chloride transport in unsaturated concretes. This paper presents a critical analysis of the time-dependent chloride diffusion coefficient in unsaturated cementitious materials exposed to marine environment. Evolutions of pore structure and chloride diffusion coefficient in saturated cementitious materials, along with the role of the degree of water saturation in long-term chloride diffusion, are analyzed. It is emphasized that the long-term sharp decrease of the chloride diffusion coefficient in marine cementitious materials is not primarily caused by densification of the microstructure due to hydration, but by the decreasing degree of water saturation with depth in the surface part of the materials. The effects of water/binder ratio and supplementary cementitious materials on chloride diffusion coefficient are different between saturated and unsaturated cementitious materials.

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