[1] Zuo Xiaobao, Sun Wei, Li Hua, et al. Calculation of ion diffusion coefficient relatedto concrete deterioration based on Debye-Hückel-Onsager theory [J]. Journal of Southeast University (English Edition), 2010, 26 (4): 569-573. [doi:10.3969/j.issn.1003-7985.2010.04.014]
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Calculation of ion diffusion coefficient relatedto concrete deterioration based on Debye-Hückel-Onsager theory(
)
基于Debye-Hückel-Onsager 理论的混凝土中离子扩散系数的计算
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 26
- Issue:
- 2010 4
- Page:
- 569-573
- Research Field:
- Materials Sciences and Engineering
- Publishing date:
- 2010-12-30
Info
- Title:
- Calculation of ion diffusion coefficient relatedto concrete deterioration based on Debye-Hückel-Onsager theory
- 基于Debye-Hückel-Onsager 理论的混凝土中离子扩散系数的计算
- Author(s):
- Zuo Xiaobao1; 2; Sun Wei1; Li Hua1; Zhou Wenjian2
-
1Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing 211189, China
2Department of Civil Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
- Keywords:
- ion; diffusion coefficient; Debye-Hückel-Onsager theory; rapid chloride migration(RCM)method; concrete
- PACS:
- TU528
- DOI:
- 10.3969/j.issn.1003-7985.2010.04.014
- Abstract:
- This paper applies the Debye-Hückel-Onsager electrolyte solution theory to investigate the diffusivity of ions in concrete pore solutions. First, a model of the diffusion coefficient associated with the ionic species, solution concentration and ambient temperature is proposed in the saturated concrete. Secondly, as an example, the effects of sodium chloride solution concentration, which are associated with influencing factors such as the ionic cloud radius, electrophoresis and relaxation, on the chloride diffusion coefficient are analyzed. It is found that the diffusion coefficient decreases with the increase in solution concentration, and the electrophoresis and ionic cloud radius are two important factors influencing the ionic diffusivity. Finally, the experiments, in which the chloride diffusion coefficients in specimens under different water-cement ratios are measured by the rapid chloride migration(RCM)method, are carried out to validate the effectiveness of the proposed model, and the results indicate that there is a generally reasonable agreement between the experimental and the proposed model results.
- 将Debye-Hückel理论和Onsager电导理论用于研究混凝土孔溶液中离子的扩散规律.首先, 建立了饱和混凝土中离子扩散系数的计算模型, 该模型考虑了离子的种类、孔溶液中离子的浓度、环境温度等因素对离子扩散系数的影响.其次, 以孔溶液中氯化钠的浓度变化为例分析了离子氛半径、松弛效应、电泳效应等对孔溶液中氯离子扩散系数的影响规律, 发现氯离子的扩散系数随氯化钠溶液浓度的增加而减小, 离子氛半径和电泳效应是影响氯离子扩散性能的重要参数.最后, 通过RCM法测定了不同水灰比混凝土的氯离子扩散系数, 并将模型的计算结果与实测结果进行了对比, 以验证模型的合理性, 结果表明所建立的模型与实测结果较为符合.
References:
[1] Coussy O, Ulm F J. Elements of durability mechanics of concrete structures [C]//Creep, Shrinkage and Durability Mechanics of Concrete and Other Quasi-Brittle Materials. Amsterdam: Elsevier Science, 2001: 3993-4009.
[2] Maekawa K, Ishida T, Kishi T. Multi-scale modeling of structural concrete [M]. New York: Taylor & Francis, 2009: 1-8.
[3] Basista M, Weglewski W. Micromechanical modeling of sulphate corrosion in concrete: influence of ettringite forming reaction [J]. Theoretical and Applied Mechanics, 2008, 35(1/2/3): 29-52.
[4] Bastidas-Arteaga E, Sànchez-Silva M, Chateauneuf A, et al. Coupled reliability model of biodeterioration, chloride ingress and cracking for reinforced concrete structures [J]. Structural Safety, 2008, 30(2): 110-129.
[5] Ulm F J, Lemarchand E, Heukamp F H. Elements of chemomechanics of calcium leaching of cement-based materials at different scales [J]. Engineering Fracture Mechanics, 2003, 70(7/8): 871-889.
[6] Clifton J R, Knab L I. Service life of concrete, NISTIR 89-4086, [R]. Washington: US Department of Commerce, 1989.
[7] Kuhl D, Meschke G. Computational modeling of transport mechanisms in reactive porous media—application to calcium leaching of concrete [C]//Proceedings of International Conference on Computational Modeling of Concrete Structures. Rotterdam: Balkema, 2003:473-482.
[8] Li Y G, Lu J F. Theory of electrolyte solutions [M]. Beijing: Tsinghua University Press, 2005:130-138.(in Chinese)
[9] Levi M D, Demadrille R, Pron A. Application of a novel refinement method for accurate determination of chemical diffusion coefficients in electroactive materials by potential step technique [J]. Journal of the Electrochemical Society, 2005, 152(2): 61-67.
[10] Dormieux L, Kondo D, Ulm F J. Microporomechanics [M]. New York: John Wiley & Sons, 2006: 64-71.
[11] Garboczi E J, Bentz D P. Computer simulation of the diffusivity of cement-based materials [J]. Journal of Materials Science, 1992, 27(8):2083-2092.
[12] Clifton J R, Ponnersheim J M. Sulfate attack of cementitious materials: volumetric relations and expansions, NISTIR 5390 [R]. Gaithersburg: Building and Fire Research Laboratory of National Institute of Standards and Technology, 1995.
[13] Masi M, Colella D, Radaelli G, et al. Simulation of chloride penetration in cement-based materials [J]. Cement and Concrete Research, 1997, 27(10): 1591-1601.
[14] Tang L, Sørensen H E. Precision of the Nordic test methods for measuring the chloride diffusion/migration coefficients of concrete [J]. Materials and Structures, 2001, 34(8): 479-485.
Memo
- Memo:
-
Biographies: Zuo Xiaobao(1968—), male, doctor, associate professor; Sun Wei(corresponding author), female, professor, the academician of Chinese Academy of Engineering, sunwei@seu.edu.cn.
Foundation items: The National Basic Research Program of China(973 Program)(No.2009CB623203), the National Natural Science Foundation of China(No.51078186), Program for Special Talents in Six Fields of Jiangsu Province(No.2008169), the Natural Science Foundation of Jiangsu Province(No.BK2010071), China Postdoctoral Science Foundation(No.200902500).
Citation: Zuo Xiaobao, Sun Wei, Li Hua, et al. Calculation of ion diffusion coefficient related to concrete deterioration based on Debye-Hückel-Onsager theory[J].Journal of Southeast University(English Edition), 2010, 26(4):569-573.