[1]孙红芳,姜策,曹坤,等.含缺陷钢筋混凝土锈蚀特征[J].深圳大学学报理工版,2021,38(5):489-495.[doi:10.3724/SP.J.1249.2021.05489]
 SUN Hongfang,JIANG Ce,CAO Kun,et al.Corrosion characteristics of defective reinforced concrete[J].Journal of Shenzhen University Science and Engineering,2021,38(5):489-495.[doi:10.3724/SP.J.1249.2021.05489]
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含缺陷钢筋混凝土锈蚀特征()
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《深圳大学学报理工版》[ISSN:1000-2618/CN:44-1401/N]

卷:
第38卷
期数:
2021年第5期
页码:
489-495
栏目:
土木建筑工程
出版日期:
2021-09-15

文章信息/Info

Title:
Corrosion characteristics of defective reinforced concrete
文章编号:
202105007
作者:
孙红芳姜策曹坤徐平贵张小刚
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
Author(s):
SUN Hongfang JIANG Ce CAO Kun XU Pinggui and ZHANG Xiaogang
College of Civil and Transportation Engineering, Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Shenzhen 518060, Guangdong Province, P.R.China
关键词:
混凝土无损研究钢筋锈蚀初始缺陷加速锈蚀保护层开裂锈蚀率
Keywords:
concrete nondestructive studies reinforcing steel corrosion initial defect accelerated corrosion cover cracking corrosion degree
分类号:
TU502
DOI:
10.3724/SP.J.1249.2021.05489
文献标志码:
A
摘要:
为深入理解钢筋的锈蚀机理及模拟自然锈蚀现象,采用X射线计算机断层扫描技术(X-ray computed tomography, XCT),无损跟踪并分析钢筋保护层中包含初始缺陷的样品腐蚀过程,对比分别在界面、中部和表面处含有缺陷的样品在通电和干湿循环两种加速锈蚀实验下的三维锈蚀形貌和破坏情况. 结果表明,干湿循环倾向于产生空间上不均匀分布的大面积锈坑,通电会产生均匀分布的微小锈坑;干湿循环锈蚀在相近的真实锈蚀率下会普遍产生比通电加速锈蚀更大的裂缝宽度,更贴近真实锈蚀情况;不同的缺陷位置以及加速锈蚀方法对于界面锈蚀产物积累的影响并不明显,但保护层开裂与缺陷位置有关,靠近样品外侧的缺陷更易导致样品开裂.
Abstract:
In order to further understand the corrosion mechanism of reinforcement and simulate the natural corrosion phenomenon, we use X-ray computed tomography (XCT) to nondestructively trace and analyze the corrosion process of the specimens containing the initial defect in protective layer. We compare three-dimensional corrosion morphology and damage of specimens containing interface, middle and surface defects under two accelerated corrosion experiments: the applied current experiment and the wet-dry cycles (W/D) experiment.The results show that W/D tends to produce spatially randomly distributed large pits, while energization produces uniformly distributed tiny pits. W/D corrosion produces generally larger crack widths at similar actual corrosion degree than those with energized accelerated corrosion, which is closer to the natural corrosion. The effects of different defect locations and accelerated corrosion methods on the accumulation of interfacial corrosion products are not obvious, but the cover cracking is obviously related to the defect location, the closer the defect is to the outside of the specimen, the more likely it leads to the cracking of specimen.

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备注/Memo

备注/Memo:
Received:2020-10-28;Accepted:2021-03-01;Online(CNKI):2021-09-01
Foundation:National Natural Science Foundation of China(51878413);Shenzhen R & D Fund (JCYJ20190808112019066)
Corresponding author:Professor ZHANG Xiaogang.E-mail: bszxg@126.com
Citation:SUN Hongfang,JIANG Ce,CAO Kun,et al.Corrosion characteristics of defective reinforced concrete[J]. Journal of Shenzhen University Science and Engineering, 2021, 38(5): 489-495.(in Chinese)
基金项目:国家自然科学基金资助项目(51878413) ;深圳市基础研究计划资助项目(JCYJ20190808112019066)
作者简介:孙红芳(1980—),深圳大学副教授、博士.研究方向:钢筋混凝土耐久性. E-mail:sunhf03@szu.edu.cn
引文:孙红芳,姜策,曹坤,等.不同条件下含缺陷钢筋混凝土锈蚀细观形貌[J]. 深圳大学学报理工版,2021,38(5):489-495.
更新日期/Last Update: 2021-09-30