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Electrochemical extraction of chlorides from reinforced concrete using a conductive cement paste as the anode

Perez, A. / Climent, M.A. / Garces, P.

The results of this research show the viability of using a conductive cement paste (CCP) anode for the electrochemical extraction of chlorides (EEC) from reinforced concrete with an efficiency similar to that obtained with a classic Ti-RuO2 anode. The obtained efficiencies are within the typical range of values of overall efficiencies found for such treatments. When a 20 mm thick CCP anode is used for an EEC treatment, a high portion of the Cl(-) initially present in the concrete cover zone (up to 61% for a 5 x 10⁶ C/m² treatment), is accumulated at the anode. These Cl(-) ions could, in turn, re-diffuse into the concrete cover, and eventually could reactivate the steel corrosion. The thickness of the conductive cement paste anode has a great influence on the capacity of the anode to retain an important part of the extracted chlorides after finishing the electrochemical treatments.

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Electrochemical extraction of chlorides from reinforced concrete using a conductive cement paste as the anode

Perez, A. / Climent, M.A. / Garces, P.

The results of this research show the viability of using a conductive cement paste (CCP) anode for the electrochemical extraction of chlorides (EEC) from reinforced concrete with an efficiency similar to that obtained with a classic Ti-RuO2 anode. The obtained efficiencies are within the typical range of values of overall efficiencies found for such treatments. When a 20 mm thick CCP anode is used for an EEC treatment, a high portion of the Cl(-) initially present in the concrete cover zone (up to 61% for a 5 x 10⁶ C/m² treatment), is accumulated at the anode. These Cl(-) ions could, in turn, re-diffuse into the concrete cover, and eventually could reactivate the steel corrosion. The thickness of the conductive cement paste anode has a great influence on the capacity of the anode to retain an important part of the extracted chlorides after finishing the electrochemical treatments.

Electrochemical extraction of chlorides from reinforced concrete using a conductive cement paste as the anode

Perez, A. / Climent, M.A. / Garces, P.

The results of this research show the viability of using a conductive cement paste (CCP) anode for the electrochemical extraction of chlorides (EEC) from reinforced concrete with an efficiency similar to that obtained with a classic Ti-RuO2 anode. The obtained efficiencies are within the typical range of values of overall efficiencies found for such treatments. When a 20 mm thick CCP anode is used for an EEC treatment, a high portion of the Cl(-) initially present in the concrete cover zone (up to 61% for a 5 x 10⁶ C/m² treatment), is accumulated at the anode. These Cl(-) ions could, in turn, re-diffuse into the concrete cover, and eventually could reactivate the steel corrosion. The thickness of the conductive cement paste anode has a great influence on the capacity of the anode to retain an important part of the extracted chlorides after finishing the electrochemical treatments.

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Title:

Electrochemical extraction of chlorides from reinforced concrete using a conductive cement paste as the anode

Additional title:

Elektrochemische Extraktion von Chloriden aus Stahlbeton mit einer leitfähigen Zementpaste als Anode

Contributors:

Perez, A. (author) / Climent, M.A. (author) / Garces, P. (author)

Published in:

Corrosion Science ; 52 ; 1576-1581

Publication date:

2010

Size:

6 Seiten, 4 Bilder, 2 Tabellen, 29 Quellen

ISSN:

DOI:

https://doi.org/10.1016/j.corsci.2010.01.016

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

aktiver Korrosionsschutz , Stahlbeton , Bewehrungsstahl , Entfernen , Chlorid , Salzextraktion , elektrochemisches Verfahren , Anode , Zementpaste , Titan , Rutheniumoxid , Vergleichsuntersuchung , elektrische Leitfähigkeit , kathodischer Schutz

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