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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: Influence of Direct Electrical Current on Specific Volume of Mortar in Seawater
Author(s): A. Le Floch and W. Hartt
Publication: Special Publication
Appears on pages(s): 481-500
Keywords: concretes; electrical resistance; expansion; mortars (material); seawater; Materials Research
Abstract:A series of hollow, cylindrical mortar specimens of 0.44 water-cement ratio were prepared without reinforcement and exposed to flowing natural seawater for up to 256 days. A direct electrical current of 2, 10, or 50 mA was impressed between the specimen core and exterior, using a pair of titanium or mixed metal oxide electrodes and a power supply. Embedded strain gage output and measurement of cylinder length and outside diameter as a function of exposure duration indicated that specific volume of the mortar increased with time with net expansion and expansion rate being greater for specimens exposed to current compared to baseline (no current) specimens. The cause of the enhanced expansion of the mortar in the presence of a direct current is discussed in this paper; the results are evaluated within the context of practical situations involving seawater exposure of cementitious materials.
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