摘要
通过NaCl溶液干湿循环对热轧光圆钢筋进行加速腐蚀,采用单尖头百分尺获取了不同锈蚀率钢筋的表面轮廓曲线,并对其进行统计分析与分形计算.结果表明,锈蚀钢筋的蚀坑呈不均匀分布特性,其表面轮廓直径符合正态分布,且具有统计分形的特征;但分形维数反映的是轮廓曲线的相似程度,对于轮廓曲线的微小变化并不敏感.通过特征轮廓参数r*将分形维数D与尺度系数C联系在一起,实现了表面多尺度相似测量与绝对测量的统一,该参数具有物理意义清晰且灵敏度高的特点,可用于钢筋不均锈蚀程度的表征.
Hot rolled plain steel bars were corroded by alternate immersion in NaCl solution,and the surface profiles of corroded steel bars were measured by using single cusp dialgauge.The results showed that there exist a large number of local corrosion morphologies on the surface of corroded bars.The distribution of steel bar diameter belongs in normal distribution,and the surface profile curves of steel bars have statistical fractal feature.However,fractal dimension can reflect the similarity of different curves,which is not sensitive to small changes in profile curves.By combining fractal dimension D with scale parameter C,characteristic profile parameter r＊ is derived to characterize the surface profile of corroded steel bars sensitively,which realized the unity of multi-scale similarity measurement and absolute measurement.The index r＊ has clear physical meanings which can be used to accurately characterize the nonuniform corrosion degree of steel bars.
出处
《应用基础与工程科学学报》
EI
CSCD
北大核心
2012年第2期296-303,共8页
Journal of Basic Science and Engineering
基金
国家重点基础研究发展计划(973计划)资助项目(2009CB623200)
国家自然科学基金资助项目(51008276)
宁波市自然科学基金资助项目(2011A610075)
关键词
热轧光圆钢筋
不均匀锈蚀
表面粗糙度
特征轮廓参数
分形表征
hot rolled plain steel bars
nonuniform corrosion
surface roughness
characteristic profile parameter
fractal based characterization
