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The corrosion of concrete, and the factors causing or preventing it, present at least as complex a problem as metallic corrosion, and the two are frequently inter‐related. A vast tonnage of steel in all kinds of structures is protected by concrete from corrosion In the following article, the author outlines the various types of cement used in concrete, following this with a description of the chemical agents which can corrode concrete, such as organic acids, sulphates, etc. He then examines concrete as a means of preventing corrosion and also as a corrosive agent.