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浙江大学学报(工学版)
J4  2010, Vol. 44 Issue (4): 831-    DOI: 10.3785/j.issn.1008-973X.2010.04.035
计算机技术﹑电信技术     
修正的氯离子在混凝土中的扩散模型及其工程应用
薛鹏飞, 项贻强
浙江大学 土木工程学系,浙江 杭州 310027
Corrected diffusion model of chloride in concrete and
its engineering application
XUE Peng-fei, XIANG Yi-qiang
Department of Civil Engineering, Zhejiang University, Hangzhou 310027, China
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摘要：

通过参数定义对Fick定律的假定进行修正,推导氯离子在混凝土中扩散的多因素修正模型,综合考虑氯离子扩散系数的时随效应、混凝土的氯离子结合能力和混凝土自身缺陷对扩散过程的影响.经分析试算,给出模型中参数的取值.利用修正的扩散模型,推导定值法、基于概率性能和基于时变可靠度的混凝土结构工作寿命预测方法,并采用上述方法对一在建的实际工程进行寿命预测.结果表明,基于时变可靠度的预测方法不仅可以考虑氯离子扩散系数及混凝土保护层厚度的随机特性,而且可以方便地考虑环境变量的随机特性,通过调整目标可靠度得到的预测结果与定值法和基于概率性能的预测方法的结果相吻合.
Abstract:

A multifactor diffusion model of chloride in concrete was formulated, in which the hypothesis of Fick’s law was corrected through parameter definition, and the factors of timedependence of chloride diffusion coefficient, chloride binding capacity of concrete, and selfdefects of concrete were taken into account. The values of the parameters in the model were given for practical applications according to the pilot calculation and analysis of mass data. By using this diffusion model, three calculation methods of concrete structure service life were further deduced, including definite value method, probability performance based method and timedependent reliability based method. The service life prediction for an actual project being constructed was carried out by using various prediction approaches mentioned above. The results show that the timedependent reliability based method can consider the randomness of chloride diffusion coefficient and the depth of concrete covering layer, and the stochastic characteristic of environment variable can be easily taken into account. By adjusting target reliability, the prediction results are consistent with those of the other two methods.
出版日期: 2010-05-14
:  TU528  
通讯作者: 项贻强，男，教授.     E-mail: xiangyiq@zju.edu.cn
作者简介: 薛鹏飞（1979—），男，河南郑州人，博士生，从事桥梁结构耐久性研究. E-mail: xuepengfei@gmail.com
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引用本文:

薛鹏飞, 项贻强. 修正的氯离子在混凝土中的扩散模型及其工程应用[J]. J4, 2010, 44(4): 831-.

XUE Feng-Fei, XIANG Yi-Jiang. Corrected diffusion model of chloride in concrete and
its engineering application. J4, 2010, 44(4): 831-.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2010.04.035    或    http://www.zjujournals.com/eng/CN/Y2010/V44/I4/831

［1］ PREZZI M, GEYSKENS P, MONTERIRO M. Reliability approach to service life prediction of concrete exposed to marine environments ［J］. ACI Materials Journal, 1996, 93(6): 544552.
［2］ MANGAT P S, MOLLOY B T. Prediction of longterm chloride concentration in concrete ［J］. Materials and Structures, 1994, 27(4): 338346.
［3］ 余红发,孙伟,麻海燕,等. 混凝土在多重因素作用下的氯离子扩散方程［J］.建筑材料学报, 2002, 5(3): 240247.
YU Hongfa, SUN Wei, MA Haiyan, et al. Diffusion equations of chloride ion in concrete under the combined action of durability factors ［J］. Journal of Building Materials, 2002, 5(3): 240247.
［4］ 洪乃丰. 混凝土中钢筋腐蚀与防护技术（3）：氯盐与钢筋锈蚀破坏［J］. 工业建筑, 1999, 29(10): 6063.
HONG Naifeng. Corrosion and protective technology of rebar in concrete (3): rebar corrosion by chloric salt ［J］. Industrial Construction, 1999, 29(10): 6063.
［5］ 金伟良,张苑竹. 预估混凝土氯离子分布的新方法［J］. 浙江大学学报：工学版, 2004, 38(2): 195199.
JIN Weiliang, ZHANG Yuanzhu. New approach to predict the distribution of chloride concentration in concrete ［J］. Journal of Zhejiang University: Engineering Science, 2004, 38(2): 195199.
［6］ COLLEPARDI M, MARCIALIS A, TURRIZIANI R. Penetration of chloride ions into cement pastes and concretes ［J］. Journal of the American Ceramic Society, 1972, 55(10): 534535.
［7］ MAAGE M. Service life model for concrete structures exposed to marine environment: initiation period ［J］. ACI Materials Journal, 1996, 93(6): 602608.
［8］ MOHAMMED T U, HAMADA H. Relationship between free chloride and total chloride contents in concrete ［J］. Cement and Concrete Research, 2003, 33(3): 14871490.
［9］ 刘秉京. 混凝土结构耐久性设计［M］. 北京：人民交通出版社, 2007: 159200.
［10］ 赵筠. 钢筋混凝土结构的工作寿命设计：针对氯盐污染环境［J］. 混凝土, 2004, 26(1): 321.
ZHAO Jun. Service life design of reinforced concrete structures exposed to chloride environment ［J］. Concrete, 2004, 26(1): 321.
［11］ FLUGE F. Environment loads on coastal bridges ［C］∥ Proceedings of the International Conference on Repair of Concrete Structures: From Theory to Practice in a Marine Environment. Svolvaer, Norway: ［s.n.］, 1997.
［12］ THOMAS M D A, BAMFORGH P B. Modeling chloride diffusion in concrete: effect of fly ash and slag ［J］. Cement and Concrete Research, 1999, 29(4): 487495.［13］ DUNASZEGI L. High performance concrete in the confederation bridge ［J］. Concrete International, 1998, 20(4): 6668.
［14］ 梁萌,李俊毅,卢秀敏,等. 混凝土保护层厚度施工允许偏差［J］. 中国港湾建设, 2006, 14(3): 912.
LIANG Meng, LI Junyi. LU Xiumin, et al. Allowable variation in construction of concrete cover to reinforcement ［J］. China Harbour Engineering, 2006, 14(3): 912.
［15］ BENTZ E C. Probabilistic modeling of service life for structures subjected to chloride ［J］. ACI Materials Journal, 2003, 100(5): 391397.
［16］ ZEMAJTIS J, WEYERS R E, SPRINKEL M M. Corrosion protection service life of lowpermeable concretes and lowpermeable concrete with a corrosion inhibitor ［C］∥ Annual Meeting of the Transportation Research Board. Washington, DC: ETATSUNIS, 1998.
［17］ STEWART M G, VU K A T. Structural reliability of concrete bridges including improved chlorideinduced corrosion models ［J］. Structural Safety, 2000(22): 313333.
［18］ FREDERIKREN J M. Chloride threshold values for service life design ［C］∥ Proceedings of the 2nd International RILEM Workshop on Testing and Modeling the Chloride Ingress into Concrete. Paris: Springer Netherlands Press, 2000.
［19］ SIEMES T, ROSTAM S. Durable safety and serviceability: a performance based design format ［C］∥ IABSE Report 74: Basis of Design and Actions on StructuresBackground and Application of Eurocode 1. Delft: ASCE Press, 1996.
［20］ FLUGE F. Marine chlorides: a probabilistic approach to derive provisions for EN 2061 ［C］∥ The 3rd DuraNet Workshop on Service Life Design of Concrete Structures from Theory to Standardization. Troms: CRC Press LLC, 2001.
［21］ prEN 1990, Eurocodebasis of structural design ［S］. CEN, Brussels, 2001.
［22］ 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［M］. 北京：中国建筑工业出版社, 2004: 3637.
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