Electrochemical removal of chloride from hardened cement paste

✍ Scribed by Josef Tritthart; Karin Pettersson; Birgit Sorensen

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 552 KB
• Volume: 23
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(93)90169-a

✦ Synopsis

The rehabilitation method "electrochemical chloride removal" can only be applied successfully if the bound chlorides can be released to the pore water and transported out of the concrete relatively quickly. Previous investigations have shown that the free chloride ions in the pore solution relatively rapidly can diffuse out of the concrete whereas the bound chlorides are only released slowly. It is therefore a matter of interest to what extend an applied direct current will enhance the release of bound chloride. This question was investigated in a collaborative project between institutes from Austria, Denmark and Sweden. It was shown that under the influence of direct current large quantities of bound chloride are dissolved and transported out of specimens rapidly. This effect is believed to be due to an easy desorption of adsorbed chloride in the electrical field.