冻融侵蚀环境下持续荷载裂缝和人工裂缝对氯离子扩散及寿命预测的影响

沈孛; 刘立渠; 刁波

doi:10.13204/j.gyjzG20041411

冻融侵蚀环境下持续荷载裂缝和人工裂缝对氯离子扩散及寿命预测的影响

doi: 10.13204/j.gyjzG20041411

沈孛^1,3,
刘立渠^1,2,
刁波³

1. 中国建筑科学研究院有限公司, 北京 100013;
2. 国家建筑工程技术研究中心, 北京 100013;
3. 北京航空航天大学交通科学与工程学院, 北京 100191

基金项目:

国家自然科学基金项目（51678021）。

详细信息

作者简介:
沈孛,男,1987年出生,博士。电子信箱:bo.shen@outlook.com

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出版历程
- 收稿日期: 2020-04-14
- 网络出版日期: 2021-10-27

EFFECTS OF SUSTAINED LOADING CRACKS AND ARTIFICIAL CRACKS ON CHLORIDION DIFFUSION AND SERVICE LIFE PREDICTION UNDER FREEZE-THAW EROSION CYCLES

SHEN Bei^1,3,
LIU Liqu^1,2,
DIAO Bo³

1. China Academy of Building Research, Beijing 100013, China;
2. National Engineering Research Center of Building Technology, Beijing 100013, China;
3. School of Transportation and Science and Engineering, Beihang University, Beijing 100191, China

摘要

摘要: 寒冷沿海环境或除冰盐环境的钢筋混凝土（RC）结构受到荷载裂缝与冻融氯腐蚀的综合作用。氯离子易通过裂缝快速侵入混凝土并腐蚀钢筋，缩短RC结构的服役寿命。对带有人工裂缝和持续荷载裂缝的RC试件进行冻融循环和氯溶液侵蚀综合作用，研究持续荷载裂缝和人工裂缝下氯离子扩散性及服役寿命差异。持续荷载裂缝宽度分别为0，0.06，0.07，0.11，0.13 mm，人工裂缝宽度分别为0，0.07，0.13，0.19 mm。研究结果表明：裂缝宽度小于0.07 mm时，持续荷载裂缝和人工裂缝对氯离子扩散性的作用差别很小；裂缝宽度大于0.07 mm时，持续荷载裂缝对氯离子扩散性作用大于人工裂缝的作用，且随着裂缝宽度增加，两者差异快速增大。分别考虑氯离子一维扩散和二维扩散状态，利用Monte-Carlo法计算得到的RC结构的服役寿命中，持续荷载裂缝的RC结构预测寿命明显低于人工裂缝。
- 钢筋混凝土 /
- 冻融循环 /
- 裂缝宽度 /
- 氯离子扩散 /
- 寿命预测
Abstract: The reinforced concrete (RC) structures in cold coastal regions or deicing salt condition were under the synthetic effects of loading cracks and corrosion led by freeze-thaw and chloride ingress. The steel was vulnerable to chloridion ingress because the crack provided convenient channel, which shortened the service life of RC structures. The chloridion profile of RC specimens with sustained loading cracks and artificial cracks after being subjected to the combined action of freeze-thaw and chloridion immersion was experimentally studied. This study focused on the difference between the effects of sustained load cracks and artificial cracks on chloridion diffusion and service life. In this study, the widths of sustained loading cracks were 0,0.06,0.07,0.11,0.13 mm and the widths of artificial cracks were 0,0.07,0.13,0.19 mm. The experimental results showed that, when the crack width was less than 0.07 mm, the differences between the effects of sustained loading cracks and artificial cracks on chloridion diffusion were slight. When the crack width was more than 0.07 mm, the effects of sustained loading cracks on chloridion diffusion was larger than that of artificial cracks. In addition, the differences became bigger as the crack width increased. The chloride diffusion in one-dimensional and two-dimensional state were respectively considered. The service life was predicted by Monte-Carlo Method. It was obvious that the service life of RC structures with sustained loading cracks was shorter than that with artificial cracks.
- reinforced concrete /
- freeze-thaw cycle /
- crack width /
- chloridion diffusion /
- service life prediction

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参考文献(16)

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