Change of pore size in concrete due to electrochemical chloride extraction and possible implications for the migration of ions |
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Authors: | Michael Siegwart John F Lyness Brian J McFarland |
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Affiliation: | a FaberMaunsell Ltd., Imperial House, 31 Temple Street, Birmingham B2 5DB, UK b School of the Built Environment, University of Ulster, Newtownabbey BT 37 0QB, Northern Ireland, UK c McFarland Associates, Ormsdale 375, Upper Newtownards Road, Belfast BT4 3LF, UK |
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Abstract: | Electrochemical chloride extraction (ECE) is used for the rehabilitation of chloride-contaminated concrete. Anions such as chloride and hydroxide are pushed away from the cathode (reinforcement), and cations such as sodium, potassium and calcium are attracted to the cathode. During ECE an increase of the concrete resistance can be observed. The results of a petrography study on ECE-treated concrete are presented in this paper. It also investigates the influence of pore size on ion migration using a concrete substitute model with known pore size. Findings showed that the pore size and pore size distribution of concrete are altered due to ECE. It is therefore suggested that concrete acts as active migration medium in the migration process by releasing ions into the pore solution. Moreover, small pores hinder the migration of ions, which may partially be responsible for changes in concrete resistance. |
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Keywords: | Microstructure Pore size distribution Electrochemical properties Chloride Concrete |
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