Full-Scale and Laboratory Tests of the Corrosion Resistance of Prestressed Reinforcement in Concrete Additives
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
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In dense concrete without cracks or with cracks where the width of exposure does not exceed approximately 0.1 mm, stressing of the reinforcement results in virtually no change in its chemical resistance in atmospheric conditions even when the concrete contains 2 chlorine salts. The nature of the control over the corrosion process is unchanged. Five-year full-scale tests have shown the possibility of protecting unstressed and prestressed reinforcement in solid concrete with 2 calcium chloride by introducing an addition of 2 sodium nitrite. Sodium nitrite is retained longer in the liquid phase of the concrete than the calcium chloride the latter converts to the low- solubility hydrate of calcium chloroaluminate. This leads to a systematic increase in the properties of nitrite additives as corrosion protection.
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