EFFECT OF DAMAGE EVOLUTION ON POISSON'S RATIO OF CONCRETE UNDER SULFATE ATTACK  

作　　者：Hui Song Jiankang Chen 

机构地区：[1]The Faculty of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China [2]State Key Laboratory of Turbulence and Complex Systems, Peking University, Beijing 100871, China

出　　处：《Acta Mechanica Solida Sinica》2011年第3期209-215,共7页固体力学学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Nos. 10932001,51079069 and 10572064);the National Basic Program of China (973 Program,2009CB623203);Ministry of Education of China (20103305110001);K.C. Wong Magna Fund in Ningbo University

摘　　要：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.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.

关 键 词：CONCRETE sulfate attack POROSITY Poisson＇s ratio damage evolution 

分 类 号：TU37[建筑科学—结构工程] P618.13[天文地球—矿床学]