THE EFFECT OF PORE SIZE ON ION MIGRATION IN CONCRETE DURING ELECTROCHEMICAL CHLORIDE EXTRACTION
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Published:2002
M Siegwart, B J McFarland, J F Lyness, W Cousins, 2002. "THE EFFECT OF PORE SIZE ON ION MIGRATION IN CONCRETE DURING ELECTROCHEMICAL CHLORIDE EXTRACTION", Challenges of Concrete Construction: Volume 3, Repair, Rejuvenation and Enhancement of Concrete: Proceedings of the International Seminar held at the University of Dundee, Scotland, UK on 5–6 September 2002, Ravindra K. Dhir, M. Roderick Jones, Li Zheng
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Electrochemical chloride extraction (ECE) is the removal of chlorides from the vicinity of the reinforcement leaving sound concrete intact. In a short period, 3 to 5 weeks, a high current, relative to other applications such as cathodic prevention or protection, is applied to the structure. Concrete shows a difference in pore size and pore size distribution before and after ECE treatment. Furthermore during ECE applications an increase in concrete resistance can be observed. An experimental study was conducted to investigate the influence of pore size on the resistance of artificial concrete pore liquid. The results showed that the resistance increases with decreasing pore size if a certain limit is exceeded. This limit appears to be related to the ion species and the concentration of the ions in the solution.
INTRODUCTION
CHLORIDE CONTAMINATION THROUHGH DIFFUSION
CHLORIDE EXTRACTION THROUGH MIGRATION
CONCRETE RESISTIVITY
EXPERIMENTAL PROCEDURE
EXPERIMENTAL RESULTS AND IMPLICATIONS
CONCLUSIONS
ACKNOWLEDGEMENTS
REFERENCES
