Damage evolution in cement mortar due to erosion of sulphate
Jian-kang Chen ^a,*, Min-qiang Jiang ^b, Jue Zhu ^a
a Mechanics and Materials Science Research Center, Ningbo University, Ningbo, Fenghua Road 818, China
b State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing, Zhongguancun, China

a b s t r a c t
Ultrasonic technique is used to detect the velocity change of stress wave propagated in the cement mortar immersed in the solution of sodium sulfate for 425 days. Also the density change of specimens at different erosion time is measured. By curve fitting, the effect of solutions’ concentration and water/cement ratio on the damage evolution is analyzed. The SEM observation on the growth of delayed ettringite is also performed. It shows that the damage evolution of specimens attacked by sulphate solution is dominantly induced by the nucleation and growth of delayed ettringite, and the average size of microvoids in cement mortar affects the damage evolution significantly.

Corrosion Science 50 (2008) 2478–2483

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