United States Department of Transportation
i
Laboratory Study of Concrete Produced with Admixtures Intended to Inhibit Corrosion
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2005-12-01
[PDF-2.59 MB]
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Abstract:A study was conducted to evaluate the properties and effectiveness of concrete produced with Hawaiian aggregates and a variety of admixtures that are added to concrete to protect the embedded reinforcing steel from corrosion. The corrosion inhibiting admixtures investigated in this study include DCI, Rheocrete CNI, Rheocrete 222+, FerroGard 901, Xypex Admix C-2000, Pro-Crylic (a latex modifier), silica fume and fly ash. Concrete mixtures for each admixture were designed by varying proportions of the mixtures to provide the best comparison of each admixture’s corrosion resistance. The corrosion resistance of the mixtures was tested by exposing test specimens to ponding cycles of a chloride solution designed to model marine environments. Physical properties of the concrete mixtures including compressive strength, elastic modulus, Poisson’s ratio, and air permeability were measured. Electrical tests measuring the electrical current, half-cell potential, corrosion rate and concrete resistivity were used to monitor the corrosion in the test specimens during the ponding cycles. Finally, chemical tests were performed to measure the chloride concentration and pH at the level of the reinforcing steel. Results as of June 2004 show all of the corrosion inhibiting admixtures except for Xypex typically performed better than their control counterparts.
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