INFLUENCE OF DIRECT ELECTRICAL CURRENT ON SPECIFIC VOLUME OF MORTAR IN SEAWATER
A series of hollow, cylindrical mortar specimens of 0.44 w/c were prepared without reinforcement and exposed to flowing natural sea water 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) ones. the cause of the enhanced expansion of the mortar in the presence of a direct current is discussed, and the results are evaluated within the context of practical situations involving sea water exposure of cementitious materials.
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Corporate Authors:
American Concrete Institute (ACI)
38800 Country Club Drive
Farmington Hills, MI United States 48331 -
Authors:
- Le Floch, A
- Hartt, W
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Conference:
- Proceedings, Third CANMET/ACI International Conference on Performance of Concrete in a Marine Environment
- Location: St. Andrews by-the-Sea, New Brunswick, Canada
- Date: 1996-8-4 to 1996-8-9
- Publication Date: 1996
Language
- English
Media Info
- Pagination: p. 481-500
Subject/Index Terms
- TRT Terms: Concrete tests; Cylindrical bodies; Direct current; Mortar; Seawater; Strain gages
- Subject Areas: Highways; Materials; I32: Concrete;
Filing Info
- Accession Number: 00728891
- Record Type: Publication
- Report/Paper Numbers: SP-163
- Files: TRIS
- Created Date: Nov 6 1996 12:00AM