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Corrosion problems in reinforced concrete: why accelerators of cement hydration usually promote corrosion of steel

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Abstract

The hydration of Portland cement and the corrosion of steel would seem at first sight to be two very different processes. However, it is observed that many additives which accelerate cement hydration also promote corrosion of steel, and those which retard hydration are usually corrosion inhibitors. There is found to be a mechanistic similarity between the two processes in that the retardation or inhibition of both processes depends on the existence of dense, impermeable films or coatings which protect the reactive surfaces beneath. Large, highly charged anions which have insoluble calcium and iron salts are good retarders of both processes. Mobile anions with highly soluble calcium and iron salts readily penetrate and cause breakdown of protective films, and are found to accelerate both processes. Such considerations are of importance in the search for cement hydration accelerators for use in reinforced concrete.

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  1. ICI plc Chemicals and Polymers Group, The Heath, Runcorn, Cheshire, UK

    N. L. Thomas

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Thomas, N.L. Corrosion problems in reinforced concrete: why accelerators of cement hydration usually promote corrosion of steel. J Mater Sci 22, 3328–3334 (1987). https://doi.org/10.1007/BF01161200

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