Effect of damage evolution on poissonʹs 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 Poissonʹs ratio. This study shows that Poissonʹs ratio is significantly affected by the concentration of solution and water-cement ratio. Poissonʹs 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 Poissonʹs 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, Poissonʹs ratio increase 10.14% compared with its initial value. There exist a sensitive region and a non-sensitive region for the change rate of Poissonʹs ratio with respect to corrosion time. The change rate of Poissonʹs ratio monotonously decreases with corrosion time in the sensitive region; in the non-sensitive region, the change rate of Poissonʹs ratio is almost equal to zero.