The study on the sulfate corrosion of composite cement concrete

• 1、School of Mechanics and Civil Engineering, China University of Mining and Technology

Abstract：In this paper, drying-immersion cycles in the natural situation and increasing the concentration of sulfate solution were used in the laboratory, in order to accelerate the sulfate corrosion of concrete. The ultrasonic speed of sound on the opposite face was tested by ultrasonic technique regularly in order to reflect the change of concretes strength with the relative elastic modulus. Though two groups of experiment which with different conditions to explain that the presence of chlorine ions affected the sulfate corrosion of concrete; the position of surface affected the evaporation surface area, and the damage of corrosion on the evaporation surface area was more serious than in other parts of the sample; the smaller ratio of the water-cement, the smaller those were corrosioned by sulfate; there were different failure modes occurred on the same strength concretes with different cation sulfate in corrosion, and the corrosion of sodium sulfate was particularly serious.

Keywords： Sulfate corrosion Sodium chloride Relative dynamic modulus