Please wait a minute...
浙江大学学报(工学版)
J4  2011, Vol. 45 Issue (12): 2127-2133    DOI: 10.3785/j.issn.1008-973X.2011.12.010
    
Chloride ingression in cracked concrete under saturated state
YAN Yong-dong1，2, JIN Wei-liang1, WANG Hai-long1
1. Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, China; 2. Faculty of Civil
Engineering and Mechanics, Jiangsu University, Zhengjiang 212013, China
Download:   PDF(0KB) HTML
Export: BibTeX | EndNote (RIS)      

Abstract  

Chloride transportation was divided into stationary and flowing solution states to investigate the mechanics of chloride transportation in cracked concrete under saturated condition. The behaviors of time-dependent surface chloride concentration and chloride diffusion coefficient in concrete were analyzed by dual porous medium model, and the behavior of linear bonding between concrete and chloride was analyzed by two-dimensional diffusion model, respectively. The governing equations of chloride ions diffusing into concrete and cracked concrete were described by the Fick’s 2nd law considering the effect of crack self-healing. Comparisons between the experimental and the numerical results showed the effectiveness of the proposed models. Dual porous medium model and two-dimensional diffusion model are both applicable for the short term ingression of chloride, and the twodimensional diffusion model is more appropriate to the long term simulation.

Published: 01 December 2011
CLC:  TU 528.1  
Service
E-mail this article
Add to my bookshelf
Add to citation manager
E-mail Alert
RSS
Articles by authors
Cite this article:

YAN Yong-dong, JIN Wei-liang, WANG Hai-long. Chloride ingression in cracked concrete under saturated state. J4, 2011, 45(12): 2127-2133.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2011.12.010     OR     https://www.zjujournals.com/eng/Y2011/V45/I12/2127


饱和状态下开裂混凝土内的氯离子输运

为得出饱和状态下氯离子在开裂混凝土内的输运规律，将饱和状态分为溶液静止和溶液流动2种情况；同时分别考虑表面氯离子质量分数与氯离子扩散系数的时变性和氯离子在混凝土内的线性结合理论，对前者采用传统的双重孔隙介质模型，对后者则采用二维扩散模型进行分析.基于Fick第二定律得出氯离子在裂缝和开裂附近混凝土内输运的计算方程，并根据裂缝自愈的影响对2种模型进行了修正.分别采用这2种模型对所设计的氯离子在预开裂混凝土试件内的侵蚀进行了计算.对比裂缝附近不同时间混凝土内氯离子质量分数的试验结果表明：短期侵蚀采用2种模型计算的结果均接近于试验值，长期侵蚀采用二维扩散模型能得到更加精确的结果.该结果为氯盐侵蚀下的混凝土结构耐久性设计与评估提供了参考.

［1］ 金伟良,赵羽习.混凝土结构耐久性［M］.北京:科学出版社,2002: 1-2.
［2］ 王铁梦.工程结构裂缝控制［M］.北京:中国建筑工业出版社,1997: 1-5.
［3］ WILL D L, DAVID D, JO A B, et al. Effect of cracking on chloride content in concrete bridge decks［J］. ACI Materials Journal, 2006, 103(6): 467-473.
［4］ BOULFIZA M, SAKAI K, YOSHIDA H, et al. Chloride ingress in marine concrete structures: a discrete representation of cracking［J］. Doboku Gakkai Nenji Gakujutsu Koenkai Koen Gaiyoshu, 2000, 55(5): 396-397.
［5］ BOULFIZA M, SAKAI K, BANTHIA N, et al. Prediction of chloride ions ingress in uncracked and cracked concrete［J］. ACI Materials Journal, 2003, 100(1): 38-48.
［6］ GRARD B, MARCHAND J. Influence of cracking on the diffusion properties of cementbased materials Part I: Influence of continuous cracks on the steadystate regime ［J］. Cement and Concrete Research, 2000, 30(1): 37-43.
［7］ WARREN T E, ROOT P J. The behaviour of naturally fractured reservoirs ［J］. Society of Petroleum Engineerings, 1963, 3: 245-255.
［8］ MOHAMMED T U, HAMADA H. Relationship between free chloride and total chloride contents in concrete［J］. Cement and Concrete Research, 2003, 33(9): 1487-1490.
［9］ LU Xinying, LI Cuiling, ZHANG Haixia. Relationship between the free and total chloride diffusivity in concrete［J］. Cement and Concrete Research, 2002, 32(2): 323-326.
［10］ ISHIDA T, MIYAHARA S, MARUYA T. Chloride binding capacity of mortars made with various Portland cements and mineral admixtures［J］. Journal of Advanced Concrete Technology, 2008, 6(2): 287-301.
［11］ DJERBI A, BONNET S, KHELIDJ A, et al. Influence of traversing crack on chloride diffusion into concrete［J］. Cement and Concrete Research, 2008, 38(6): 877-883.
［12］ TAKEWAKA K, YAMAGUCHI T, MAEDA S. Simulation model for deterioration of concrete structures due to chloride attack［J］. Journal of Advanced Concrete Technology, 2003, 1(2): 139-146.
［13］ ISMAIL M, TOUMI A, FRANOIS R, et al. Effect of crack opening on the local diffusion of chloride in inert materials［J］. Cement and Concrete Research, 2004, 34(4): 711-716.
［14］ ISMAIL M, TOUMI A, FRANOIS R, et al. Effect of crack opening on the local diffusion of chloride in cracked mortar samples［J］. Cement and Concrete Research, 2008, 38(8/9): 1106-1111.
［15］ FRANCOIS R, TOUMI A, ISMAIL M, et al. Effects of cracks on local diffusion of chloride and on longterm corrosion behavior of reinforced concrete members［C］∥ Proceedings of an International Workshop on Durability of Reinforced Concrete under Combined Mechanical and Climate Loads(CMCL). Qingdao：［s.n.］, 2005: 113-121.
［16］ KATO Y, UOMOTO T. Modeling of effective diffusion coefficient of substances in concrete considering spatial properties of composite materials［J］. Journal of Advanced Concrete Technology, 2005, 3(2): 241-251.
［17］ SANDRA J. Chloride ingress and transport in cracked concrete［D］. Montreal, Canada: McGill University, 2004: 83-84.
［18］ ISHIDA T, IQBAL PON, ANH HTL. Modeling of chloride diffusivity coupled with nonlinear binding capacity in sound and cracked concrete［J］. Cement and Concrete Research, 2009, 39(10): 913-923.
［19］ SURYAVANSHI A K, SWAMY R N, CARDEW G E. Estimation of diffusion coefficients for chloride ion penetration into structural concrete［J］. ACI Materials Journal, 2002, 99(5): 441-449.
［20］ 中国工程院土木水利与建筑学部工程结构安全性与耐久性研究咨询项目组.混凝土结构耐久性设计与施工指南(CCES 01-2004)［M］. 北京: 中国建筑工业出版社, 2004: 36-40.
[1] WANG Hai-long, GUO Chun-ling, SUN Xiao-yan, JIN Wei-liang. Degradation mesomechanism of concrete deteriorated by soft water[J]. J4, 2012, 46(10): 1887-1892.
[2] WANG Hai-long, DONG Yi-sen, SUN Xiao-yan, JIN Wei-liang. Damage mechanism of concrete deteriorated by sulfate attack
in wet-dry cycle environment[J]. J4, 2012, 46(7): 1255-1261.