| 氯盐干湿环境下受弯横向裂缝对钢筋混凝土耐久性影响 |
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| 引用本文： | 陆春华,金伟良,延永东.氯盐干湿环境下受弯横向裂缝对钢筋混凝土耐久性影响[J].海洋工程,2012,30(1):131-136. |
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| 作者姓名： | 陆春华 金伟良 延永东 |
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| 作者单位： | 江苏大学土木工程与力学学院;浙江大学结构工程研究所 |
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| 基金项目： | 国家自然科学基金资助项目(50908103),国家自然科学基金重大国际合作研究资助项目(50920105806);江苏大学高级人才项目(11JDG132) |
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| 摘 要： | 为了研究持续开裂状态下横向裂缝对钢筋混凝土结构耐久性的影响特性,开展了8根受弯开裂钢筋混凝土梁构件的盐溶液干湿循环试验;借助无损检测技术和破损实测方法,分别对氯离子侵入量、钢筋半电池电位、腐蚀电流密度以及平均锈蚀率等进行了对比分析。研究结果表明,裂缝的存在将提高混凝土的渗透性,裂缝处及周围混凝土内的氯离子含量明显增大;对于一定裂缝分布状况的钢筋混凝土试验梁,内部钢筋的腐蚀电位、腐蚀电流密度以及平均锈蚀率均高于裂缝自愈及无裂缝的试验梁,并受到保护层厚度与裂缝开展状态的影响,其影响规律可用单位长度内的平均裂缝宽度与保护层厚度的比值wm/c来进行综合评价。综合试验结果,初步建议海洋干湿侵蚀环境下钢筋混凝土构件的最大裂缝宽度wmax宜小于0.003 3 c,相关结论可为海洋混凝土结构的耐久性设计提供参考。
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| 关 键 词： | 氯盐环境 干湿循环 钢筋混凝土 横向裂缝 钢筋锈蚀 |
Influence of transverse cracks on durability of RC member under chloride dry and wet cycles |
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| LU Chun-hu,JIN Wei-liang and YAN Yong-dong.Influence of transverse cracks on durability of RC member under chloride dry and wet cycles[J].Ocean Engineering,2012,30(1):131-136. |
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| Authors: | LU Chun-hu JIN Wei-liang and YAN Yong-dong |
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| Institution: | 1.Faculty of Civil Engineering and Mechanics,Jiangsu University,Zhenjiang 212013,China;2.Institute of Structural Engineering,Zhejiang University,Hangzhou 310058,China) |
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| Abstract: | In order to investigate the influence of transverse cracks on durability of reinforced concrete(RC)structures,eight cracked RC beams were tested under chloride dry and wet cycles.Based on some non-destructive technologies and breakage tests,the chloride content,half-cell potential,corrosion current density and average corrosion rate of corroded steels were examined and discussed.It can be found from the test that the permeation of the cracked concrete will be increased and the chloride content around the crack will be improved.For steels in the cracked beams,their half-cell potential,corrosion current density and average corrosion rate are all higher than those in crack healing and non-crack beams.The corrosion of steel in cracked beams is affected by the cover thickness and crack width,which can be expressed by the ratio of mean crack width wm to cover thickness c.Based on our experimental results,the maximum crack width,wmax,of RC beams in marine environment is suggested to be less than 0.003 3c,which can provide some reference for durability design of marine RC structures. |
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| Keywords: | chloride environment dry and wet cycle reinforced concrete transverse crack reinforcement corrosion |
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