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中国腐蚀与防护学报  2015, Vol. 35 Issue (3): 257-264    DOI: 10.11902/1005.4537.2014.148
  研究报告 本期目录 | 过刊浏览 |
钢筋非均匀锈蚀导致的混凝土保护层锈胀开裂过程分析
程旭东1(),孙连方1,曹志烽1,朱兴吉2
2. 韩国高丽大学土木、环境与建筑工程系 首尔 136-701
Cracking Process Analysis of Concrete Cover Caused by Non-uniform Corrosion
Xudong CHENG1(),Lianfang SUN1,Zhifeng CAO1,Xingji ZHU2
1. College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China
2. Department of Civil, Environmental & Architectural Engineering, Korea University, Seoul 136-701, Republic of Korea
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摘要: 

基于钢筋锈蚀速率理论和锈蚀产物非均匀分布理论,提出一种混凝土非均匀锈胀位移随时间变化的理论模型,并将时间离散化,直接获得不同时刻的非均匀锈胀位移分布；此后,将锈胀位移输入ABAQUS的扩展有限元模型中,获得不同时刻的锈胀裂缝开展情况。通过对比采用均匀分布理论和非均匀分布理论得到的锈胀裂缝开展情况可见,不仅两者的裂缝形态有很大差异,后者的裂缝开展过程更加符合实际工程的观测,并且其裂缝开展速度也远远快于前者。若仍采用均匀分布理论,钢筋混凝土结构的承载能力将被严重高估,因此对于钢筋混凝土结构的腐蚀研究,建议采用非均匀分布理论。
关键词 ： 锈胀开裂,  锈蚀产物,  非均匀分布,  锈胀位移,  时间离散化,  扩展有限元    
Abstract：

A model was proposed to describe the swell-cracking of concrete induced by non-uniform rusting of re-bar versus time by consideration of regulations of the re-bar rusting process and the non-uniform distribution of the rust products on the re-bar. Then the distribution of displacement of the non-uniform rust-swelling of concrete at different moment could be deduced through the proposed model by using time discrete method. Thereafter, from the rust-swelling displacement, the ABAQUS swelling finite element model could deduce the overall cracking process. By comparison between the two overall swell-cracking processes induced by uniform and non-uniform rust induced swellings respectively, it follows that there exists large difference between the two cracking processes, while a prediction of much higher crack propagation rate by the later one is fairly well agree with the situation of engineering practice. Therefore, the model of non-uniform rust-swelling of concrete induced by non-uniform rusting of re-bar shows good prospect to be adopted in the study of corrosion behavior of steel re-bar reinforced concrete.
Key words： swell-cracking of concrete    corrosion product    non-uniform distribution    rust-swelling displacement    time discretization    extended finite element
    
基金资助:山东省自然科学基金项目 (ZR2012EEL23) 和中央高校基本科研业务费专项资金项目 (15CX05004A) 资助
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引用本文:

程旭东,孙连方,曹志烽,朱兴吉. 钢筋非均匀锈蚀导致的混凝土保护层锈胀开裂过程分析[J]. 中国腐蚀与防护学报, 2015, 35(3): 257-264.
Xudong CHENG, Lianfang SUN, Zhifeng CAO, Xingji ZHU. Cracking Process Analysis of Concrete Cover Caused by Non-uniform Corrosion. Journal of Chinese Society for Corrosion and protection, 2015, 35(3): 257-264.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.148      或      https://www.jcscp.org/CN/Y2015/V35/I3/257

图1  椭圆形锈胀位移理论模型
图2  锈胀位移关系图
图3  钢筋混凝土梁横截面几何形状
Parameter Value Parameter Value
Elastic modulus of concrete Ec / Pa 3.25×1010 Environment temperature Tc / ℃ 5
Poisson’s ratio of concrete νc 0.20 Environment relative humidity Hw 0.9(0.75)
Elastic modulus of corrosion products Er / Pa 100×106 Water content of concrete PS / % 35
Poisson’s ratio of corrosion products νr 0.49 Chloride content k C l - / % 0.2
Density of steel ρs / kgm-3 7800 Fracture energy G / Jm-2 140
Water-cement ratio W/C 0.35 Maximum principal stress σmax / Nm-2 1.71×106
表1  材料参数总结
图4  Hw=0.9时裂缝贯穿前后混凝土径向位移uc(θ)的分布
图5  Hw=0.75时裂缝贯穿前后混凝土径向位移uc(θ) 的分布
图6  锈蚀产物非均匀分布下混凝土保护层锈胀裂缝开展过程图
图7  锈蚀产物均匀分布下混凝土保护层锈胀裂缝开展过程图
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