Sensitivity analysis of simplified diffusion-based corrosion initiation model of concrete structures exposed to chlorides
Sensitivity analysis of simplified diffusion-based corrosion initiation model of concrete structures exposed to chlorides
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DOI：
10.1016/j.cemconres.2006.01.015
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发表时间：
2006-07-01
影响因子：
11.4
通讯作者：
Lounis, Zoubir
中科院分区：
文献类型：
--
作者：
Zhang, Jieying;Lounis, Zoubir
本文提出了一个基于扩散的腐蚀引发模型的钢筋混凝土结构在含氯环境中的敏感性分析的结果。分析微分技术被用来确定的敏感性的腐蚀开始的时间模型的四个参数，其中包括在混凝土中的氯离子扩散系数，钢筋的氯离子阈值水平，混凝土保护层深度，和表面氯离子浓度。对于传统的碳钢，腐蚀开始的时间被发现是最敏感的混凝土保护层的深度，其次是氯离子扩散系数，归一化的敏感性系数约为2和-1。对于耐腐蚀钢，腐蚀开始的时间是最敏感的表面氯离子浓度和氯离子阈值水平，其次是混凝土保护层深度和氯离子扩散系数。这种敏感性分析的结果进行了详细讨论，包括在预测时间的变化引起的四个模型参数的变化和它们的影响，在腐蚀环境中建造的混凝土结构的设计和维护腐蚀开始。(C)2006爱思唯尔有限公司保留所有权利。
This paper presents the results of a sensitivity analysis of the diffusion-based corrosion initiation model for reinforced concrete structures built in chloride-laden environments. Analytical differentiation techniques are used to determine the sensitivity of the time to corrosion initiation to the four governing parameters of the model, which include chloride diffusivity in concrete, chloride threshold level of steel reinforcement, concrete cover depth, and surface chloride concentration. For conventional carbon steel, the time to corrosion initiation is found to be most sensitive to concrete cover depth, followed by chloride diffusion coefficient, with normalized sensitivity coefficients of about 2 and -1. For corrosion resistant steels, the time to corrosion initiation is most sensitive to the surface chloride concentration and chloride threshold level followed by the concrete cover depth and chloride diffusion coefficient. The results of this sensitivity analysis are discussed in detail, including the variations in predicted time to corrosion initiation induced by variations of the four model parameters and their implications for the design and maintenance of concrete structures built in corrosive environments. (C) 2006 Elsevier Ltd. All rights reserved.