MACROCELL CORROSION OF STEEL IN CONCRETE – EXPERIMENTS AND NUMERICAL MODELLING
MACROCELL CORROSION OF STEEL IN CONCRETE – EXPERIMENTS AND NUMERICAL MODELLING
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混凝土中钢的宏观细胞腐蚀——实验和数值模拟
DOI：
10.1201/9781439823910.ch7
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
B. Elsener
中科院分区：
文献类型：
--
作者：
S. Jäggi;H. Böhni;B. Elsener
具有局部阳极和大阴极的宏电池腐蚀经常发生在混凝土中钢筋的氯化物诱导腐蚀中，并且是导致非常高的局部腐蚀攻击和例如在桥面或下部结构中发现的钢筋的横截面减小的原因。在砂浆和混凝土中的模型宏电池中，研究了电阻率、温度和几何布置（阴阳极面积比、阴极位置）对宏电池电流及其在阴极上的分布的影响。阴极氧还原反应和阳极溶解的钢在点蚀条件下进行了研究，分别作为输入数据的宏电池的数值模拟与相同的几何阳极/阴极的安排砂浆实验。一个非常好的建模和实验之间的协议被发现的总宏电池电流，其分布和温度的依赖性。这种数值方法可以非常迅速地进行参数研究，并以合理的方式设计混凝土宏单元实验。
Macrocell corrosion with a local anode and a large cathode frequently occurs in chloride induced corrosion of rebars in concrete and is responsible for very high local corrosion attacks and reduction in cross section of the rebars found e.g. in bridge decks or substructures. In model macrocells in mortar and in concrete the influence of resistivity, temperature and geometrical arrangement (area ratio between cathode and anode, location of cathode) on macrocell current and its distribution on the cathode has been studied. The cathodic oxygen reduction reaction and the anodic dissolution of the steel in pitting conditions have been studied separately and used as input data for the numerical modelling of the macrocell with the same geometrical anode / cathode arrangements as the mortar experiments. A very good agreement between modelling and experiments was found for the total macrocell current, its distribution and its temperature dependance. This numerical approach allows to perform parameter studies very rapidly and to design experiments with macrocells in concrete in a rational way.