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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: The Effect of Electrochemical Chloride Extraction Treatment on the Microstructure and Mechanical Properties of Cementitiuos Materials
Author(s): T. D. Marcotte, N. M. Ihekwaba, C. M. Hansson
and B. B. Hope
Publication: Special Publication
Appears on pages(s): 507-530
Keywords: Bond strength; chlorides; compressive strength; density; energy;
Abstract:Electrochemical chloride extraction is a rehabilitation process aimed at reducing the chloride levels of contaminated reinforced concrete structures to below the critical values for corrosion of the reinforcing steel (rebar). While this has been demonstrated to be feasible, the effects of the treatment on the microstructure and the mechanical properties of the concrete have not yet been adequately documented. This research attempts to characterize the changes in concrete and mortar, particularly at their interface with the rebar, due to an extraction treatment. To this end, concrete specimens with 3.0% Cl by mass of cement, and mortar specimens with 2.0% Cl by mass of the cement were cast, cured and, after various exposures, subjected to electrochemical chloride extraction treatments typical of those applied commercially. The mortar specimens were examined metallographically while concrete specimens were subjected to mechanical durability studies. It is clear from this study that the structure and mechanical properties of the concrete immediately adjacent to the reinforcing steel are severely degraded by the electrochemical extraction treatment. It remains to be seen if the damage is permanent or if there is a subsequent redistribution of ions which could ameliorate the structure and, hence, the properties.
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