钢筋-保护层界面局部典型锈峰的三维形态  

Three-dimensional morphology of local typical rust peaks at the rebar-protective layer interface

作　　者：张小刚[1] 徐平贵 罗琦 姜策 ZHANG Xiaogang;XU Pinggui;LUO Qi;JIANG Ce(Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China)

机构地区：[1]深圳大学土木与交通工程学院、广东省滨海土木工程耐久性重点实验室,广东深圳518060

出　　处：《混凝土》2024年第8期38-43,47,共7页Concrete

基　　金：国家自然科学基金(51878413,52178230,51878412);深圳市基础研究计划项目(JCYJ20190808112019066)。

摘　　要：钢筋-保护层界面处锈蚀产物的累积与扩张将造成保护层的锈胀开裂。通过X射线无损检测技术对氯离子侵蚀下钢筋混凝土界面处形成的锈峰形貌进行了研究。对锈峰表面进行三角网格化处理;引入伸长指数,平坦指数,球形度和凸度等形态学指标进行研究;基于K-means聚类算法划分锈峰形状。结果表明锈峰形态主要呈现为扁长形,扁半椭球形,半椭球形及半球形,且锈峰形态具有不稳定性。锈峰凸度指标符合Burr分布规律,并且不同锈蚀率下锈峰的球形度、凸度指标与保护层裂缝宽度的发展趋势一致。The accumulation and expansion of corrosion products at the interface between the protective layer and the steel bar will cause the cracking of the protective layer.The morphology of rust peak formed at the interface of reinforced concrete under chloride erosion was studied by X-ray nondestructive testing.The surface of rust peak was triangulated.Some morphological indexes such as elongation index,flatness index,sphericity and convexity were introduced.The shape of rust peak was divided based on K-means clustering algorithm.The results show that the morphology of rust peak is mainly oblate,oblate semi-ellipsoid,semi-ellipsoid and hemispherical,and the morphology of rust peak is unstable.The convexity index of rust peak conforms to Burr distribution law,and the sphericity and convexity index of rust peak under different corrosion rates are consistent with the development trend of crack width of protective layer.

关 键 词：无损检测 锈蚀产物 三维重构 形态参数 K-MEANS 

分 类 号：TU528.064[建筑科学—建筑技术科学]