氯离子阈值分布与钢 - 混凝土界面关系的统计分析

Amit Kenny¹, Amnon Katz²
1、沙蒙工程学院土木工程系
2、以色列理工学院 Technion 土木与环境工程学院

摘要

在文献中可以发现氯化物阈值的广泛变化。上述变化的可能原因包括：阈值测定方法、水泥化学和混凝土微
观结构。无论这些变化的原因是什么，都可以使用概率方法来确保钢筋混凝土结构在特定时期的耐久性。概率方法
给出了给定所需置信度的设计阈值。先前的研究通过 BSE 自动图像分析和氯化物阈值分析了钢筋周围混凝土的微观
结构。研究发现，钢筋周长上钢筋与最近混凝土实体之间的最大距离与氯化物阈值之间存在统计上的显著相关性。
极值统计理论表明，最大值数据的分布是一般极值分布（GEVD）。对上述研究数据的重新分析发现，正如统计理论
所预期的，最大钢 - 混凝土距离根据 GEVD 分布。因此，由于氯化物阈值取决于钢 - 混凝土距离，其分布与 GEVD
有关。本文的分析表明，所接收的氯化物阈值是理论预测的 GEVD。从理论角度来看，GEVD 可能是许多其他腐蚀
过程的分布。将 GEVD 识别为描述钢筋混凝土（RC）结构中腐蚀起始的正确分布，可以实现更准确的防腐规划。

关键词

钢筋混凝土；概率设计；氯化物阈值；统计分析；腐蚀

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