United States Department of Transportation
i
Properties of Concrete Produced with Admixtures Intended to Inhibit Corrosion
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2001-02-01
[PDF-4.14 MB]
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Abstract:A study was conducted to evaluate properties of fresh and hardened concrete produced with Hawaiian aggregates and admixtures that are added to concrete to protect reinforcing steel from corrosion. DCI, Rheocrete CNI, Rheocrete 222+, FerroGard 901, Xypex Admix C-2000, a latex-modifier, silica fume, and fly ash were the admixtures intended to slow the corrosion process. These admixtures were used in mixtures designed by varying the proportions of mixtures that were already considered to be corrosion resistant. Compressive strength, elastic modulus, and Poisson’s ratio were determined for all mixtures. DCI, Rheocrete CNI, and silica fume significantly increased compressive strength, while Xypex Admix C-2000 and the latex-modifier reduced compressive strength. Concrete permeability, the ability to reduce chloride penetration, and pH were evaluated for selected mixtures. Silica fume and the latex-modifier produced substantial reductions in permeability. ACI equations for elastic modulus overestimated the elastic modulus values for almost all of the mixtures. The average overestimation was 14% for two equations provided by ACI 318, and 8% for the equation recommended by ACI 363 for high strength concrete.
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