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Factors influencing electrochemical removal of chloride from concrete

Arya, C. / Said-Shawqi, Q. / Vassie, P.R.W.

Electrochemical chloride removal was studied using prisms made from concrete containing various levels of chlorides derived from sodium chloride added during mixing. The amount of chloride removed during the treatment was assessed by analysing the anolyte. The amount of chloride removed increases with increasing applied potential and number of reinforcing bars at a particular depth. Higher initial chloride contents result in greater amounts of chloride removal but the chloride remaining was found to be independent of the initial chloride content. Greater proportions of chloride are removed from specimens where the depth of chloride contamination is less than the depth of the reinforcing bars. Where chlorides exist at levels deeper than or adjacent to the reinforcing steel, an external cathode positioned at the face remote from the source of chloride can be used to increase chloride removal. Electrochemical removal of chlorides from a face remote from the source of chloride contamination (soffit desalination) has been shown to be a feasible option for arresting corrosion.

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Factors influencing electrochemical removal of chloride from concrete

Arya, C. / Said-Shawqi, Q. / Vassie, P.R.W.

Electrochemical chloride removal was studied using prisms made from concrete containing various levels of chlorides derived from sodium chloride added during mixing. The amount of chloride removed during the treatment was assessed by analysing the anolyte. The amount of chloride removed increases with increasing applied potential and number of reinforcing bars at a particular depth. Higher initial chloride contents result in greater amounts of chloride removal but the chloride remaining was found to be independent of the initial chloride content. Greater proportions of chloride are removed from specimens where the depth of chloride contamination is less than the depth of the reinforcing bars. Where chlorides exist at levels deeper than or adjacent to the reinforcing steel, an external cathode positioned at the face remote from the source of chloride can be used to increase chloride removal. Electrochemical removal of chlorides from a face remote from the source of chloride contamination (soffit desalination) has been shown to be a feasible option for arresting corrosion.

Factors influencing electrochemical removal of chloride from concrete

Arya, C. / Said-Shawqi, Q. / Vassie, P.R.W.

Electrochemical chloride removal was studied using prisms made from concrete containing various levels of chlorides derived from sodium chloride added during mixing. The amount of chloride removed during the treatment was assessed by analysing the anolyte. The amount of chloride removed increases with increasing applied potential and number of reinforcing bars at a particular depth. Higher initial chloride contents result in greater amounts of chloride removal but the chloride remaining was found to be independent of the initial chloride content. Greater proportions of chloride are removed from specimens where the depth of chloride contamination is less than the depth of the reinforcing bars. Where chlorides exist at levels deeper than or adjacent to the reinforcing steel, an external cathode positioned at the face remote from the source of chloride can be used to increase chloride removal. Electrochemical removal of chlorides from a face remote from the source of chloride contamination (soffit desalination) has been shown to be a feasible option for arresting corrosion.

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Title:

Factors influencing electrochemical removal of chloride from concrete

Additional title:

Einflußfaktoren auf die elektrochemische Beseitigung von Chlorid aus Beton

Contributors:

Arya, C. (author) / Said-Shawqi, Q. (author) / Vassie, P.R.W. (author)

Published in:

Cement and Concrete Research ; 26 ; 851-860

Publication date:

1996

Size:

10 Seiten, 12 Bilder, 2 Tabellen, 10 Quellen

ISSN:

DOI:

https://doi.org/10.1016/0008-8846(96)00067-1

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

Elektrochemie , Chlorid , Natriumchlorid , Ion , Beton , vorgespanntes Baumaterial , armierter Beton , Korrosion , chemische Reaktion , Konzentrationsverteilung , Anode , Kathode , elektrisches Potenzial

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