深圳大学学报理工版

刘昱清,董鹏,滕晓娟,等.基于X-ray μCT技术的钢筋锈胀特征分析[J].深圳大学学报理工版,2017,34(No.6(551-660)):618-624.[doi:10.3724/SP.J.1249.2017.06618]
Liu Yuqing,Dong Peng,Teng Xiaojuan,et al.Characterization of corrosion expansion feature of steel bar by means of X-ray μCT[J].Journal of Shenzhen University Science and Engineering,2017,34(No.6(551-660)):618-624.[doi:10.3724/SP.J.1249.2017.06618]

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基于X-ray μCT技术的钢筋锈胀特征分析

刘昱清^1,2,董鹏²,滕晓娟²,贺林龙²,洪舒贤²,董必钦²,邢锋^1,2

1)中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江哈尔滨 150080; 2)深圳大学土木工程学院,广东省滨海土木工程耐久性重点实验室,广东深圳 518060

关键词：建筑材料; 混凝土; 钢筋腐蚀; 膨胀系数; 时变; X射线微观层析成像

Characterization of corrosion expansion feature of steel bar by means of X-ray μCT

Liu Yuqing^1,2, Dong Peng², Teng Xiaojuan², He Linlong², Hong Shuxian², Dong Biqin², and Xing Feng^1,2

Liu Yuqing^1,2, Dong Peng², Teng Xiaojuan², He Linlong², Hong Shuxian², Dong Biqin², and Xing Feng^1,21)Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, Heilongjiang Province, P.R.China2)School of Civil Engineering, Guangdong Province Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Shenzhen 518060, Guangdong Province, P.R China

Keywords： building materials; concrete; reinforcement corrosion; expansion coefficient; time variation; X-ray computer microtomography

DOI: 10.3724/SP.J.1249.2017.06618

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针对传统锈胀解析模型无法实现对膨胀系数进行时变假设,利用X射线微观层析成像(X-ray μCT),对同一试块中钢筋腐蚀全过程进行追踪监测. 在现有研究基础上对钢筋腐蚀全过程的腐蚀膨胀系数时变规律进行研究,实现了对腐蚀形貌的实时表征和对腐蚀产物体积、钢筋腐蚀体积的定量计算. 结果表明,钢筋体积随着腐蚀过程呈下降趋势; 腐蚀过程的膨胀系数逐渐增大(1.98～5.87),曲线斜率与腐蚀物的体积变化率一致. 随着腐蚀的不断深入,腐蚀产物的组分也具有相应的时变性. 时变腐蚀膨胀系数呈上升趋势,与腐蚀过程膨胀系数研究取值范围(2～6)吻合.

In the traditional model of corrosion calculations, the time-dependent assumption of expansion coefficient cannot be realized. In this paper, we use X-ray computer microtomography(X-ray μCT)to trace the whole corrosion process of the specimen. The time-dependent feature of corrosion expansion coefficient is studied on basis of the existing research. The corresponding corrosion morphology is given, and the volume of the corrosion product and the corrosion volume of the steel bar are calculated. The results show that the volume of the steel decreases with the corrosion process. The expansion coefficient in the corrosion process increases from 1.98 to 5.87, with the same rate of curve as the volume changing rate. As the corrosion process continues, the components of the corrosion product also have the corresponding time variability. The time dependent corrosion expansion coefficient shows an increasing trend, which is consistent with the value, which is between 2 and 6, of the expansion coefficient in corrosion process.