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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: Degradation of Normal Portland and Slag Cement Concrete Under Load Due to Reinforcement Corrosion
Author(s): K. E. Philipose, J. J. Beaudoin, and R. F. Feldman
Publication: Special Publication
Appears on pages(s): 1491-1508
Keywords: chloride ions; corrosion; degradation; microcracking; polarization; reinforcing steels; slag cements; Materials Research
Abstract:Corrosion of reinforcement is one of the major degradation mechanisms of reinforced concrete elements. The majority of studies published on concrete-steel corrosion have been conducted on unstressed specimens. Structural concrete, however, is subjected to substantial strain near the steel reinforcing bars that resist tensile loads, which results in a system of microcracks. Report presents the initial results of an investigation to determine the effect of applied load and microcracking on the rate of ingress of chloride on and corrosion of steel in concrete. Simply supported concrete beam specimens were loaded to give a maximum strain of about 600 æî on the tension face. Chloride ion ingress on cores taken from loaded specimens was monitored using energy-dispersive x-ray analysis techniques. Corrosion current and rate measurements using linear polarization electrochemical techniques were also obtained on the same loaded specimens. Variables investigated included two concrete types, two steel cover depths, three applied load levels, bonded and unbonded reinforcing steel, and the exposure to tension and compression beam faces to chloride solution. One concrete mixture was made with Type 10 portland cement, the other with 75 percent blast furnace slag, 22 percent Type 50 cement, and 3 percent silica fume. The rate of chloride ion ingress into reinforced concrete and hence the time for chloride ion to reach the reinforcing steel is shown to be dependent on applied load and the concrete quality. The dependence of corrosion process descriptors--passive layer formation, initiation period, and propagation period--on level of applied load is discussed.
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