Relationship between chloride diffusivity and pore structure of hardened cement paste

Based on effective media theory, a predictive model, relating chloride diffusivity to the capillary pores, gel pores, tortuosity factor, and pore size distribution of hardened cement, is proposed. To verify the proposed model, the diffusion coefficient of chloride ions, the degree of hydration, and...

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Bibliographic Details
Published inJournal of Zhejiang University. A. Science Vol. 12; no. 5; pp. 360 - 367
Main Authors Sun, Guo-wen, Sun, Wei, Zhang, Yun-sheng, Liu, Zhi-yong
Format Journal Article
LanguageEnglish
Published Hangzhou Zhejiang University Press 01.05.2011
Subjects
Civil Engineering
Classical and Continuum Physics
Engineering
Industrial Chemistry/Chemical Engineering
Mechanical Engineering
Hardened cement paste
Porosity
Constrictivity
Tortuosity factor
TU528
Chloride diffusivity
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Summary:Based on effective media theory, a predictive model, relating chloride diffusivity to the capillary pores, gel pores, tortuosity factor, and pore size distribution of hardened cement, is proposed. To verify the proposed model, the diffusion coefficient of chloride ions, the degree of hydration, and peak radius of capillary pores of cement paste specimens were measured. The predicted results for chloride diffusivity were compared with published data. The results showed that the predicted chloride diffusivity of hardened cement paste was in good agreement with the experimental results. The effect of the evolution of pore structures in cement paste on chloride diffusivity could be deduced simultaneously using the proposed model.
Bibliography:Hardened cement paste; Chloride diffusivity; Porosity; Tortuosity factor; Constrictivity Key words： Hardened cement paste, Chloride diffusivity, Porosity, Tortuosity factor, Conslrictivity
Guo-wen SUN, Wei SUN, Yun-sheng ZHANG, Zhi-yong LIU （Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing 211189, China）
Based on effective media theory, a predictive model, relating chloride diffusivity to the capillary pores, gel pores, tortuosity factor, and pore size distribution of hardened cement, is proposed. To verify the proposed model, the diffusion coefficient of chloride ions, the degree of hydration, and peak radius of capillary pores of cement paste specimens were measured. The predicted results for chloride diffusivity were compared with published data. The results showed that the predicted chloride diffusivity of hardened cement paste was in good agreement with the experimental results. The effect of the evolution of pore structures in cement paste on chloride diffusivity could be deduced simultaneously using the proposed model.
33-1236/O4
ISSN:1673-565X
1862-1775
DOI:10.1631/jzus.A1000413