氯离子在轴向受压混凝土内的输运试验

延永东; 陆春华; 刘荣桂

doi:10.13204/j.gyjz201301017

氯离子在轴向受压混凝土内的输运试验

doi: 10.13204/j.gyjz201301017

1.
江苏大学,江苏镇江212013

基金项目:

国家自然科学基金项目(50908103,51178417);江苏大学高级人才基金项目(1281480002);中国博士后科学基金项目(2012M511215);高性能土木工程材料国家重点实验室开放基金项目(2011-CEM010)

详细信息

作者简介:
延永东,男,1982年出生,博士,讲师. 电子信箱:yand@ujs.edu.cn

中图分类号: TU528
计量
- 文章访问数: 93
- HTML全文浏览量: 4
- PDF下载量: 142
- 被引次数: 0
出版历程
- 收稿日期: 2012-05-13
- 刊出日期: 2013-01-20

EXPERIMENTS OF CHLORIDE INGRESSION IN COMPRESIVE STRESSED CONCRETE

1.
Jiangsu University,Zhenjiang 212013,China

摘要

摘要: 设计水灰比为0.55的素混凝土棱柱体试件,研究加载中和加载后不同压应力水平下的氯离子在混凝土内的侵蚀。对试件在8%浓度的氯化钠溶液中浸泡180 d后的取样进行测试,测试结果表明,当施加的压应力小于抗压强度的70%时,持续荷载与瞬时荷载下混凝土内同一深度的自由氯离子质量分数变化很小,且没有一定的规律性。而当压应力施加到95%的抗压强度后卸载时,混凝土内的氯离子质量分数明显增大。施加不大于70%抗压强度的压应力后,混凝土表观氯离子扩散系数有所减小,持续荷载下回归得到的表观氯离子扩散系数比相同应力水平下瞬时荷载时的要小,顺着荷载施加方向的氯离子质量分数和表观扩散系数要小于垂直荷载施加方向的值。根据试验数据及所需满足的边界条件建立了相应的计算公式。
- 混凝土 /
- 压力 /
- 氯离子 /
- 扩散系数
Abstract: Prism concrete specimens,with a W/C of 0.55,were immersed in chloride solutions under and after axial compressive stress.Chloride ions contents were obtained from the stressed specimens after 180 d exposure.Results showed that chloride ions content kept nearly the same in specimens with different compressive stresses below 70% of strength for loading and loaded specimens.This value increased significantly when concrete was loaded to 95% stress and then unloaded.Chloride ions diffusion coefficient decreased firstly when the stress was below 70% of strength,and then gradually increased.Chloride ions diffusion coefficient in loaded concrete was slightly large than that in loading concrete with the same compressive stress below 70% of strength.The chloride content and diffusion coefficient were also larger for perpendicular direction than that along the loading direction.Polynomial equations were established according to the experiment results for durability design of actual structures.
- concrete /
- compressive stress /
- chloride /
- diffusion coefficient

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参考文献(14)

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