Chloride transport behavior in cementitious-based materials under cyclic drying-wetting condition without influence of carbonation

被引：0
|
作者：
Chang H. [1 ]
Jin Z. [2 ]
机构：
[1] School of Qilu Transportation, Shandong University, Jinan
[2] School of Civil Engineering, Qingdao University of Technology, Qingdao
来源：
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2019年 / 49卷 / 06期
关键词：
Cementitious-based materials; Chloride; Concentration peak; Cyclic drying-wetting; Model; N[!sub]2[!/sub] environment;
D O I：
10.3969/j.issn.1001-0505.2019.06.019
中图分类号：
学科分类号：
摘要：
To ascertain the chloride distribution feature and law in specimens under cyclic drying-wetting conditions to be devoid of carbonation effect, a cyclic drying-wetting experiment was carried out in N2 environment to completely eliminate the influence of carbonation during drying; and a numerical model of chloride transport was established based on diffusion and capillary adsorption-moisture evaporation. The results show that a chloride concentration peak appears both in the experimental and calculated profiles, and the peak chloride content and its location of experimental and calculated results are very close. Moreover, the peaks appear at the depth of 0 to 2 mm. In addition, both the increase of exposure time, water-cement ratio, temperature, and concentration of external salt solution and the decrease of ambient humidity will cause the peak of the chloride concentration to be more significant and the position of the peak to migrate deeper from the exposed surface. The consistence of experimental and calculated results presents the distribution feature and law of chloride in specimens without the impact of carbonation, and verifies the vital role of capillary adsorption-moisture evaporation on the formation of chloride concentration peak. © 2019, Editorial Department of Journal of Southeast University. All right reserved.
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页码：1153 / 1161
页数：8
相关论文
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