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Binding of chloride in mortar containing admixed or penetrated chlorides
The presence of admixed chloride in the mortar does not hinder ingress of chloride from the environment, and the amounts originating from the two sources are additive. As it would be expected, some of the chloride added to the mortar during the mixing procedure is immediately bound chemically as monochloroaluminate, yet chloride introduced at a later stage will also, to a certain extent (dependent obviously on the particular cement), take part in this reaction. The efficiency of the electrochemical removal of the free (water-soluble) chlorides which had penetrated from the environment was greater than that of the free admixed chlorides. This supports the hypothesis that some of the admixed chlorides become physically trapped in the CaO-SiO2-H2O gel during hydration whereas the chloride penetrated from the environment would enter and leave the paste exclusively via the capillary pores. It has been shown, that chemically bound chloride can be released and extracted as a result of the application of a potential difference between an embedded electrode and an external electrode. Hence, electrochemical chloride removal of existing structures may be a valid method for the stopping of ongoing corrosion. However, it must be determined whether the method is in fact nondestructive to the concrete.
Binding of chloride in mortar containing admixed or penetrated chlorides
The presence of admixed chloride in the mortar does not hinder ingress of chloride from the environment, and the amounts originating from the two sources are additive. As it would be expected, some of the chloride added to the mortar during the mixing procedure is immediately bound chemically as monochloroaluminate, yet chloride introduced at a later stage will also, to a certain extent (dependent obviously on the particular cement), take part in this reaction. The efficiency of the electrochemical removal of the free (water-soluble) chlorides which had penetrated from the environment was greater than that of the free admixed chlorides. This supports the hypothesis that some of the admixed chlorides become physically trapped in the CaO-SiO2-H2O gel during hydration whereas the chloride penetrated from the environment would enter and leave the paste exclusively via the capillary pores. It has been shown, that chemically bound chloride can be released and extracted as a result of the application of a potential difference between an embedded electrode and an external electrode. Hence, electrochemical chloride removal of existing structures may be a valid method for the stopping of ongoing corrosion. However, it must be determined whether the method is in fact nondestructive to the concrete.
Binding of chloride in mortar containing admixed or penetrated chlorides
Einbindung von Chloriden in Mörteln mit zugemischten oder infiltrierten Chloriden
Enevoldsen, J.N. (author) / Hansson, C.M. (author) / Hope, B.B. (author)
Cement and Concrete Research ; 24 ; 1525-1533
1994
9 Seiten, 2 Bilder, 3 Tabellen, 17 Quellen
Article (Journal)
English
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