电场作用下混凝土中氯离子输运模型及仿真

刘宗民; 赵昆璞; 毛继泽

doi:10.3969/j.issn.0258-2724.2017.04.010

电场作用下混凝土中氯离子输运模型及仿真

doi: 10.3969/j.issn.0258-2724.2017.04.010

基金项目:

国家自然科学基金青年科学基金资助项目（50908059）

中央高校基本科研业务费专项资金资助项目（HEUCF160207）

黑龙江省自然科学基金资助项目（E201415）

详细信息

作者简介:
刘宗民(1976—),男,副教授,博士,研究方向为新型结构的力学性能分析,电话:13936339820,E-mail:liuzongmin@hrbeu.edu.cn

计量
- 文章访问数: 505
- HTML全文浏览量: 60
- PDF下载量: 213
- 被引次数: 0
出版历程
- 收稿日期: 2015-11-05
- 刊出日期: 2017-08-25

Transportation Model and Simulation of Chloride in Concrete under Electric Field

摘要

摘要: 为了研究处于氯盐、杂散电流耦合侵蚀环境的混凝土结构耐久性，对电场作用下氯离子在混凝土内部的输运规律进行研究.首先，根据Hamilton型变分原理，建立电场作用下混凝土内部氯离子的输运模型；其次，基于细观角度，建立混凝土内部孔隙水饱和度的定量计算公式，并同时考虑时变因素和孔隙水饱和度对氯离子输运的影响，对非饱和状态下氯离子的扩散系数予以修正；最后，通过comsol模拟氯离子在混凝土内部的输运过程，并对电场作用下氯离子的输运速率与仅有浓度梯度作用下氯离子自由扩散速率进行了比较分析.研究结果表明：应用电场作用下混凝土中的氯离子输运模型研究地下混凝土结构的耐久性及结构寿命预测问题是可行的；在10 V电场作用下，混凝土中的氯离子的输运效率相当于自由扩散状态下氯离子输运效率的769倍.
- 电场 /
- 氯离子的扩散系数 /
- 输运模型 /
- 孔隙水饱和度
Abstract: For the study of the durability of concrete structures in the coupling environment of chlorine salt and stray current, transportation law of chloride in concrete under electric field was investigated. According to the Hamilton-type variational principle, a transportation model of chloride in concrete under electric field was established. Based on the view of mesoscopic, quantitative formula of water saturation of pore in concrete was established. Considering the effects of time factor and water saturation of pore on transportation, the diffusion coefficient of chloride under unsaturated state was corrected. The transportation process of chloride in concrete was simulated by comsol, And the transportation rate of chloride under electric field was compared with free diffusion rate under concentration gradient. It is a suitable way to study the durability and service life prediction of underground concrete structures by the chloride transportation model of concrete under electric field. In the influence of 10 V electric field, the transportation efficiency of chloride in concrete is equivalent to 769 times of the efficiency of chloride transportation under free diffusion.
- electric field /
- chloride diffusion coefficient /
- transportation model /
- water saturation of pore

HTML全文

参考文献(15)

郑晓燕. 氯盐环境下混凝土结构性能劣化机理与试验[M]. 北京:中国建材工业出版社,2014: 3-6.

LUO X, WEI J. Stress-strain relationship and failure criterion for concrete after freezing and thawing cycles[J]. Journal of Southwest Jiaotong University, 2006, 14(3): 265-271.

PIVONKA P, HELLMICH C, SMITH D. Microscopic effects on chloride diffusivity of cement pastes a scale-transition analysis[J]. Cement and Concrete Research, 2004, 34(12): 2251-2260.

ZHENG J J, ZHOU X Z. Analytical solution for the chloride diffusivity of hardened cement paste[J]. Journal of Materials in Civil Engineering, ASCE, 2008, 20(5): 384-391.

姬永生,曾平,马会荣,等. 荷载引起的横向裂缝区钢筋锈蚀速率[J]. 西南交通大学学报,2013,48 (1): 36-41,61. JI Yongsheng, ZENG Ping, MA Huirong, et al. Experimental research on influence of transverse crack on corrosion rate of rebar in concrete[J]. Journal of Southwest Jiaotong University, 2013, 48(1): 36-41,61.

BRETON D, OLLIVIER J P, BALLIVY G. Diffusivity of chloride ions in the transition zone between cement paste and granite[C]//Interfaces between Cementitious Composites. London: E FN Spon, 1992: 279-288.

耿健,丁庆军,孙家瑛,等. 杂散电流影响下氯离子向混凝土内部的传输特征[J]. 建筑材料学报,2010,13(1): 121-124. GEN Jian, DING Qingjun, SUN Jiaying, et al. Transport characteristics of chloride ion in concrete with stray current[J]. Journal of Building Materials, 2010, 13(1): 121-124.

胡曙光,耿健,丁庆军. 杂散电流干扰下掺矿物掺合料水泥石固化氯离子的特点[J]. 华中科技大学学报:自然科学版,2008,36(3): 32-34. HU Shuguang, GEN Jian, DING Qingjun. The characters of cement hardened paste with mineral admixturesbinding chloride ion under the condition of stray current interfering[J]. Journal of Huazhong University of Science and Technology: Natural Science Edition, 2008, 36(3): 32-34.

张奕. 氯离子在混凝土中的输运机理研究[D]. 杭州:浙江大学,2008.

CHAUBE R P, SHIMOMURA T, MAEKAWA K. Multiphase water movement in concrete as a multi-component system[C]//Proceedings of the 5th RILEM International Symposium on Creep and Shrinkage in Concrete. London: E FN Spon, 1993: 139-144.

金伟良,张奕,卢振勇. 非饱和状态下氯离子在混凝土中的渗透机理及计算模型[J]. 硅酸盐学报,2008,36(10): 1362-1369. JIN Weiliang, ZHANG Yi, LU Zhengyong. Mechanism and mathematic modeling of chloride permeation in concrete under unsaturated state[J]. Journal of the Chinese Ceramic Society, 2008, 36(10): 1362-1369.

姬永生. 钢筋混凝土的全寿命过程与预计[M]. 北京:中国铁道出版社,2011: 34-35.

胡海昌. 弹性力学的变分原理及其应用[M]. 北京:科学出版社,1981: 1-10.

SHANE J D, MASON T O, JENNINGS H M. Effect of the interfacial transition zone on the conductivity of portland cement mortars[J]. Journal of the American Ceramic Society, 2000, 83(5): 1137-1144.

徐宁,黄庆华,张伟平,等. 混凝土结构空间多尺度相对湿度值[J]. 土木建筑与环境工程,2012,34(1): 35-41. XU Ning, HUANG Qinghua, ZHANG Weiping, et al. Spatial multi-scale relative humidity values for concrete structures[J]. Journal of Civil, Architectural Environmental Engineering, 2012, 34(1): 35-41.

施引文献

附加材料(0)

访问统计

点击查看大图

计量

文章访问数: 505
HTML全文浏览量: 60
PDF下载量: 213
被引次数: 0

电场作用下混凝土中氯离子输运模型及仿真

doi: 10.3969/j.issn.0258-2724.2017.04.010

作者简介: 刘宗民(1976—),男,副教授,博士,研究方向为新型结构的力学性能分析,电话:13936339820,E-mail:liuzongmin@hrbeu.edu.cn

计量

出版历程

Transportation Model and Simulation of Chloride in Concrete under Electric Field

计量

出版历程

目录

作者简介:
刘宗民(1976—),男,副教授,博士,研究方向为新型结构的力学性能分析,电话:13936339820,E-mail:liuzongmin@hrbeu.edu.cn