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Investigations on the chloride transformation during the electrochemical chloride extraction process
The problem of the chloride induced corrosion of the reinforcement is concerning many structures of bridges and parking decks, where de-icing salts can cause heavy corrosion of the reinforcing steel. This often requires a considerable effort in concrete repair within the desidered period of use. Beside the common methods of conventional concrete repair, during the last 20 years alternative electrochemical methods have been established, such as Cathodic Protection or the Chloride Extraction (CE). Structures of reinforced concrete attacked by chlorides from de-icing salts can be repaired by use of electrochemical methods, such as CE. the article describes an experiment to investigate the relationship between the electrical charge applied, the chloride contents in the concrete before and after extraction process, and the amount of chlorides in the electrolyte in order to get knowledge about efficiency of a CE application. An assumption about the chloride transformation during CE will be made. It was shown the relative percentage of extracted and measured chlorides, compared on 100%. The balance should be at 50%, and in tendency it fits. It can be evaluated, that approximately 20% of the extracted chloride is to be caught in the electrolyte; the remaining 80% will react electrochemically at the anode. For inert anodes, such as the Titananode, this can result in a considerable amount of chlorine gas, which developed during the CE process and that has to be prevented from polluting the environment.
Investigations on the chloride transformation during the electrochemical chloride extraction process
The problem of the chloride induced corrosion of the reinforcement is concerning many structures of bridges and parking decks, where de-icing salts can cause heavy corrosion of the reinforcing steel. This often requires a considerable effort in concrete repair within the desidered period of use. Beside the common methods of conventional concrete repair, during the last 20 years alternative electrochemical methods have been established, such as Cathodic Protection or the Chloride Extraction (CE). Structures of reinforced concrete attacked by chlorides from de-icing salts can be repaired by use of electrochemical methods, such as CE. the article describes an experiment to investigate the relationship between the electrical charge applied, the chloride contents in the concrete before and after extraction process, and the amount of chlorides in the electrolyte in order to get knowledge about efficiency of a CE application. An assumption about the chloride transformation during CE will be made. It was shown the relative percentage of extracted and measured chlorides, compared on 100%. The balance should be at 50%, and in tendency it fits. It can be evaluated, that approximately 20% of the extracted chloride is to be caught in the electrolyte; the remaining 80% will react electrochemically at the anode. For inert anodes, such as the Titananode, this can result in a considerable amount of chlorine gas, which developed during the CE process and that has to be prevented from polluting the environment.
Investigations on the chloride transformation during the electrochemical chloride extraction process
Untersuchungen zum Stoffumsatz beim elektrochemischen Chloridentzug
Schneck, U. (Autor:in)
Materials and Corrosion ; 51 ; 91-96
2000
6 Seiten, 5 Bilder, 3 Tabellen, 10 Quellen
Aufsatz (Zeitschrift)
Englisch
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