Evaluation of corrosion resistance to Cl-, SO42- ions of guangzhou metro engineering concrete by simulated and accelerated tests

Corrosion resistance to Cl-, SO42- ions of Guangzhou Metro engineering concrete was studied by the simulated and accelerated corrosion tests. The specimen was the same as practical engineering in concrete mix proportion. The results show that the ratio of compressive strength of the specimen which cured in simulated groundwater solution with chlorine ion and sulfate ion at 20 degrees C to that of the specimen which cured in standard environment, decreased continuously by 90 days, and the penetrated chlorine ion content in the specimen was close to the criterion limit. The influences of rising temperature or wetting-drying cycle (WDC) on compressive strength and corrosion resistance of concrete are quite different.