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A CRITIQUE OF THE ACI 318 CHLORIDE LIMITS

D W Pfeifer, W F Perenchio, William G. Hime

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Abstract

Allowable chloride limits for new concrete, as outlined by the American Concrete Institute's Committee 318 in its Building Code, have been established since 1983. However, they do not appear to be consistent with current corrosion technology. This paper traces the changes in the requirements for chloride ion and suggests new limits based on the results of recent studies. Research is urgently needed to correlate the initiation of corrosion with effective or threshold chloride, as measured by procedures that discount chloride tied up in aggregate and possibly in the cement paste. Studies must be made to determine why the threshold chloride level is apparently so different for deformed reinforcing bar and 7-wire prestressing strand.

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What this paper is about

Allowable chloride limits for new concrete, as outlined by the American Concrete Institute's Committee 318 in its Building Code, have been established since 1983. However, they do not appear to be consistent with current corrosion technology. This paper traces the changes in the requirements for chloride ion and suggests new limits based on the results of recent studies. Research is urgently needed to correlate the initiation of corrosion with effective or threshold chloride, as measured by procedures that discount chloride tied up in aggregate and possibly in the cement paste. Studies must be made to determine why the threshold chloride level is apparently so different for deformed reinforcing bar and 7-wire prestressing strand.

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Available abstract

Allowable chloride limits for new concrete, as outlined by the American Concrete Institute's Committee 318 in its Building Code, have been established since 1983. However, they do not appear to be consistent with current corrosion technology. This paper traces the changes in the requirements for chloride ion and suggests new limits based on the results of recent studies. Research is urgently needed to correlate the initiation of corrosion with effective or threshold chloride, as measured by procedures that discount chloride tied up in aggregate and possibly in the cement paste. Studies must be made to determine why the threshold chloride level is apparently so different for deformed reinforcing bar and 7-wire prestressing strand.

Key concepts: Chloride, Corrosion, Aggregate (composite), Current (fluid), Cement, Materials science, Reinforced concrete, Bar (unit)

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