Influence of Concrete Powders on Binding Capacity of Sulfate Ions

The effects of age corrosion, sulfate ion concentration and dissolved environment on the binding capacity of concrete powders to sulfate ions were studied. Results indicate that in the same concentration of sodium sulfate solution soaking, the binding capacity to sulfate ions increased with the growing of age corrosion. The binding capacity of concrete powders to sulfate ions approximately obeys quadratic function with the increase of sulfate ion concentration, and the correlation coefficient reached more than 0.96. The binding capacity of concrete to sulfate ions was bigger in nitric acid environment than in aqueous soluble environment in the sulfate ion solution with the same concentration.