Concrete cylinder pipe referred to in this paper consists of a thin steel cylinder which acts primarily as a water proofing membrane surrounded by concrete. Steel reinforcements consisting of either mild steel rods (AWWA C-303) or prestressed wire (AWWA C-301) are wrapped over the core and embedded in a mortar coating. Little has been published on corrosion protection measures for concrete cylinder pipe. Since concrete cylinder pipe has experienced relatively few corrosion problems, there has been very little history in its protection. Because of this sparsity of data it is not surprising that even the qualified corrosion engineers in the field do not always agree on the techniques and criteria for the protection of concrete cylinder pipe. In a previous paper1 , the three basic corrosion mechanisms by which mortar protects steel, and how these differ from the protective mechanisms of organically coated steel pipe, were described. Since the corrosion protective mechanisms of concrete cylinder pipe are very different from those of dielectric coated steel, it is not surprising that the methods of protection are also different. The vast majority of environments encountered in the United States and Canada are benign to concrete cylinder pipe.
