钢筋混凝土结构中钢筋局部腐蚀的数值模型

IF 2.9 4区 工程技术 Q2 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Computers and Concrete Pub Date : 2021-04-01 DOI:10.12989/CAC.2021.27.4.385
Xuandong Chen, Qing Zhang, Ping Chen, Qiuqun Liang
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引用次数: 3

摘要

钢筋腐蚀是钢筋混凝土结构耐久性失效的主要原因。为了揭示钢筋混凝土结构中钢筋的腐蚀机理,建立了钢筋宏观腐蚀的三维数值模型。采用修正直接迭代法(MDIM)求解钢筋腐蚀的偏微分方程组。通过对电化学参数的敏感性分析发现,与其他电化学参数相比,平均腐蚀电流密度对阴极Tafel斜率和阳极平衡电位的变化更为敏感。此外,阳极与阴极(A/C)比和阳极长度对平均腐蚀电流密度有显著影响,特别是当A/C比小于0.5和阳极长度小于35 mm时。更重要的是,在相同的A/C比值下,半周向腐蚀的腐蚀速率远大于周向腐蚀。仿真结果为深入了解钢筋混凝土结构中钢筋的电化学腐蚀过程提供了独特的视角,可用于实际工程中钢筋混凝土结构的使用寿命预测。
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Numerical model for local corrosion of steel reinforcement in reinforced concrete structure
Reinforcement corrosion is the main cause of the durability failure of reinforced concrete (RC) structure. In this paper, a three-dimensional (3D) numerical model of macro-cell corrosion is established to reveal the corrosion mechanisms of steel reinforcement in RC structure. Modified Direct Iteration Method (MDIM) is employed to solve the system of partial differential equations for reinforcement corrosion. Through the sensitivity analysis of electrochemical parameters, it is found that the average corrosion current density is more sensitive to the change of cathodic Tafel slope and anodic equilibrium potential, compared with the other electrochemical parameters. Furthermore, both the anode-to-cathode (A/C) ratio and the anodic length have significant influences on the average corrosion current density, especially when A/C ratio is less than 0.5 and anodic length is less than 35 mm. More importantly, it is demonstrated that the corrosion rate of semi-circumferential corrosion is much larger than that of circumferential corrosion for the same A/C ratio value. The simulation results can give a unique insight into understanding the detailed electrochemical corrosion processes of steel reinforcement in RC structure for application in service life prediction of RC structures in actual civil engineer.
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来源期刊
Computers and Concrete
Computers and Concrete 工程技术-材料科学:表征与测试
CiteScore
8.60
自引率
7.30%
发文量
0
审稿时长
13.5 months
期刊介绍: Computers and Concrete is An International Journal that focuses on the computer applications in be considered suitable for publication in the journal. The journal covers the topics related to computational mechanics of concrete and modeling of concrete structures including plasticity fracture mechanics creep thermo-mechanics dynamic effects reliability and safety concepts automated design procedures stochastic mechanics performance under extreme conditions.
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