Sulfate Resistance of Concrete Using Unclassified fly Ash from China

Abstract

The behaviour of concrete using Fengzhen unclassified fly ash from China as a mixture of concrete was studied to verify the sulfate resistance. The results showed that the density of the specimens with unclassified fly ash was slightly lower than that of without unclassified fly ash, but the density significantly declined when AE agent was used. The order of the compression strength and dynamic modulus of elasticity of specimens at the age of 28 days was normal concrete>concrete with fly ash>AE concrete, while the order of the sulfate resistance was quite reversed. The higher compressive strength does not mean that it would be better in sulfate resistance. By this experiment, the effect of sulfate resistance of concrete with Fengzhen unclassified fly ash was ascertained.