地下结构混凝土随机分布裂缝对硫酸根离子的扩散影响

刘伟庆; 刘鑫; 王曙光; 杜东升

doi:10.3969/j.issn.0258-2724.2013.06.005

地下结构混凝土随机分布裂缝对硫酸根离子的扩散影响

doi: 10.3969/j.issn.0258-2724.2013.06.005

基金项目:

国家重点基础研究发展计划973计划资助项目（2011CB013800）

江苏省普通高校研究生科研创新计划资助项目（CXLX12_0438）

详细信息

作者简介:
刘伟庆（1964-），男，教授，博士生导师，研究方向为工程抗震与减震控制、结构材料耐久性等，E-mail：wqliu@njut.edu.cn

计量
- 文章访问数: 1093
- HTML全文浏览量: 68
- PDF下载量: 492
- 被引次数: 0
出版历程
- 收稿日期: 2013-12-10
- 刊出日期: 2013-12-25

Influence of Stochastic Cracks on Sulfate Diffusion in Concrete of Underground Structure

摘要

摘要: 为研究地下结构混凝土随机裂缝宽度对混凝土内硫酸根离子扩散系数及浓度分布的影响，假设混凝土初始裂缝由矩形裂缝单元构成，裂缝单元出现位置的概率密度函数沿裂缝纵向服从正态分布，推导了开裂混凝土内硫酸根离子的扩散系数随裂缝宽度的变化规律.根据菲克第二定律修正硫酸根离子的扩散方程，并针对两种不同的裂缝形态参数进行了数值算例分析.结果表明：两种情况下，离子的浓度均可在50 h内达到稳定；裂缝形态参数越小且裂缝形态越不规则，离子扩散得越慢，离子浓度达到稳定的时间越长.
- 地下结构混凝土 /
- 随机裂缝宽度 /
- 扩散系数 /
- 离子浓度分布
Abstract: The influence of the stochastic crack width on sulfate diffusion coefficient and concentration in underground concrete was investigated. It is assumed that the crack is composed of crack elements, and the probability density function of crack element location along longitudinal direction of the crack follows the normal distribution. The rule of sulfate diffusion coefficient in cracking concrete varying with the cracks width was deduced. Based on Fick's second law, a modified diffusion equation was presented, and the numerical simulation was conducted with two crack shape parameters. The results showed that in both cases the sulfate ion concentration reached a steady state within 50 h. The small crack shape parameter and irregular crack shape slowed down the diffusion rate and the time for steady concentration.
- concrete of underground structure /
- stochastic crack width /
- diffusion coefficient /
- ion concentration distribution

HTML全文

参考文献(41)

BASISTA M, WEGLEWSKI W. Micromechanical modeling of sulphate corrosion in concrete: influence of ettringite forming reaction

万旭荣, 左晓宝.硫酸盐侵蚀下混凝土扩散反应过程的数值模拟

[J]. Theoretical and Applied Mechanics, 2008, 35(1/2/3): 29-52.

左晓宝, 孙伟. 硫酸盐侵蚀下的混凝土损伤破坏全过程

[J]. 工业建筑, 2010, 40(增刊): 843-846. WAN Xurong, ZUO Xiaobao. Numerical simulation of diffusion reaction of sulfate ion in concrete subjected to external sulfate attack

MARCHAND J, SAMSON E, MALTAIS Y, et al. Theoretical analysis of the effect of weak sodium sulfate solutions on the durability of concrete

[J]. Industrial Construction, 2010, 40(Sup.): 843-846.

GOSPODINOV P N. Numerical simulation of 3D sulfate ion diffusion and liquid push out of the material capillaries in cement composites

张杰. 地铁车站顶板(逆筑法)施工阶段抗裂研究

[J]. 硅酸盐学报, 2009, 37(7): 1063-1067. ZUO Xiaobao, SUN Wei. Full process analysis of damage and failure of concrete subjected to external sulfate attack

吴国雄, 姚令侃, 易志坚. 水泥混凝土路面早期裂缝的形成机理

张士萍, 刘加平, 孙伟, 等. 裂缝对混凝土中介质传输的影响

[J]. Journal of the Chinese Ceramic Society, 2009, 37(7): 1063-1067.

张士萍, 刘加平, 董良峰. 收缩裂缝对混凝土氯离子传输的影响

[J]. Cement and Concrete Composites, 2002, 24(3/4): 317-329.

VINCENT P, KHELIDJ A, HERV B. Crack effects on gas and water permeability of concretes

CHEN S G, ZHANG H, TAN X R, et al. Key technologies for construction of Jinping traffic tunnel with an extremely deep overburden and a high water pressure

封坤, 何川, 苏宗贤. 南京长江隧道原型管片结构破坏试验研究

[J]. Cement and Concrete Research, 2005, 35(3): 520-526.

过镇海. 混凝土的强度和本构关系原理与应用

黄文新. 广州地铁混凝土结构在环境多因素作用下抗侵蚀耐久性研究

[J]. 西南交通大学学报, 2000, 35(2): 133-136. ZHANG Jie. A study on crack resistance of subway station top floor during construction

[J]. Journal of Southwest Jiaotong University, 2000, 35(2): 133-136.

DJERBI A, BONNET S, KHELIDJ A, et al. Influence of traversing crack on chloride diffusion into concrete

ANDR S E I, CARLOS M. L, IGNACIO C. Chemo-mechanical analysis of concrete cracking and degradation due to external sulfate attack: A meso-scale model

SAMSON E, MARCHAND J, SNYDER K. Calculation of ionic diffusion coefficients on the basis of migration test results

[J]. 西南交通大学学报, 2003, 38(3): 304-308. WU Guoxiong, YAO Lingkan, YI Zhijian. Research on forming mechanism of inchoate cracks in cement concrete pavement

[J]. Journal of Southwest Jiaotong University, 2003, 38(3): 304-308.

[J]. 混凝土, 2009, 21(12): 1-4. ZHANG Shiping, LIU Jiaping, SUN Wei, et al. Effect of cracking on transport properties in concrete

[J]. Concrete, 2009, 21(12): 1-4.

[J]. 武汉理工大学学报, 2011, 33(6): 90-92. ZHANG Shiping, LIU Jiaping, DONG Liangfeng. Influence of shrinkage cracking on chloride ions transport of concrete

[J]. Journal of Wuhan University of Technology, 2011, 33(6): 90-92.

[J]. Cement and Concrete Research, 2009, 39(6): 537-547.

[J]. Journal of Modern Transportation, 2011, 19(2): 94-103.

[J]. 西南交通大学学报, 2011, 46(4): 564-571. FENG Kun, HE Chuan, SU Zongxian. Prototype test on failure characteristics of segmental lining structure for nanjing yangtze river tunnel

[J]. Journal of Southwest Jiaotong University, 2011, 46(4): 564-571.

[M]. 北京:中国建筑工业出版社, 2004: 11-14.

[D]. 广州:华南理工大学, 2010.

[J]. Cement and Concrete Research, 2008, 38(6): 877-883.

[J]. Cement and Concrete Composites, 2011, 33(3): 411-423.

[J]. Material and Structure, 2003, 36(3): 156-165.

施引文献

附加材料(0)

访问统计