Effect of damage evolution on Poisson’s ratio of concrete under sulfate attack
Experimental results about concrete under sulfate attack are summarized, which include the variation of mass density of samples and velocity of ultrasonic wave propagating in samples. The evolution damage is analyzed in terms of the experimental results, and close attention is paid to the effect of damage evolution on Poisson’s ratio. This study shows that Poisson’s ratio is significantly affected by the concentration of solution and water-cement ratio. Poisson’s ratio of concrete changes very little when the water-cement ratio is selected as 0.6 or 0.8, so that such change may be neglected. If water-cement is 0.4, however, the Poisson’s ratio of the sample significantly changes. When the concrete sample of 0.4 water-cement ratio is immersed in sodium sulfate solution of 8% concentration for 285 days, Poisson’s ratio increase 10.14% compared with its initial value. There exist a sensitive region and a non-sensitive region for the change rate of Poisson’s ratio with respect to corrosion time. The change rate of Poisson’s ratio monotonously decreases with corrosion time in the sensitive region; in the non-sensitive region, the change rate of Poisson’s ratio is almost equal to zero.
Key wordsconcrete sulfate attack porosity Poisson’s ratio damage evolution
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- Otsuki, N., Miyazato, S.I., Diola, N.B. and Suzuki, H., Influences of bending crack and water-to-cement ratio on Chloride-induced corrosion of main reinforcing bars and stirrups. Materials Journal, 2000, 97(4): 454–464.Google Scholar
- Zhu, H.J., Cheng, H.L. and Jiang, D.M., Special Concretes and New Type Concretes, VCH, 2004.Google Scholar
- Clifton, J.R., Frohnsdorff, G. and Ferraris, C., Standards for evaluating the susceptibility of cement-based materials to external sulphate attack. Material Science of Concrete-Sulfate Attack Mechanisms, 1999, (Special Volume): 337–355.Google Scholar
- Mehta, P.K., Structure, Properties and Materials. Zhu, Y.N., Shen, W., et al., Shanghai: Tongji University Press, 1991, 11: 94–95.Google Scholar
- Hu, S.Y., Wang, T.C. and Li, C.B., Experiment study on the porosity of concrete matrix. Shan Xi Construction, 2009, (35)36: 168–169 (in Chinese).Google Scholar