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Effect of crack opening and recovery on chloride penetration into reinforced concrete hollow piles

机译:开裂和回复对氯离子渗入钢筋混凝土空心桩的影响

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摘要

This study explores the chloride penetration characteristics of reinforced concrete (RC) hollow piles. Special splitting tests were designed to produce different crack widths in the inner and outer surfaces of RC hollow piles. The cracked specimens were then immersed in 5 % NaCl solution for 180 days. The chloride concentration profiles in the cracked zones were obtained by potentiometric titration. This study indicates that the rate of chloride accumulation in the inner pile surface is faster than that in the outer surface for the same exposure time. This may be attributed to differences in the material compositions of the inner and outer surfaces, which are caused by centrifugal processing during specimen preparation. The critical value for V-shaped cracks on the outer surface of RC hollow piles was found to be around 70 mu m; however, a critical value was absent for cracks on the inner surface because these present parallel-wall characteristic. In addition, the characteristics of crack development and recovery in the inner and outer pile surfaces were evaluated. The analysis indicates that the depth at which chloride affects the concrete significantly increases with the crack-recovery rate for the apparent crack widths around 130 mu m on the outer surface of the concrete layer.
机译:本研究探讨了钢筋混凝土空心桩的氯离子渗透特性。设计了特殊的劈裂测试,以在RC空心桩的内外表面产生不同的裂缝宽度。然后将破裂的样品浸入5%NaCl溶液中180天。通过电位滴定获得裂纹区域中的氯化物浓度分布。这项研究表明,在相同的暴露时间下,内桩表面的氯离子积累速率要快于外桩表面的氯离子积累速率。这可能归因于内表面和外表面材料组成的差异,这是由样品制备过程中的离心处理引起的。发现RC空心桩外表面V形裂缝的临界值为70微米左右。但是,内表面裂纹是没有临界值的,因为这些裂纹具有平行壁特征。此外,还评估了桩内外表面的裂纹扩展和恢复特性。分析表明,在混凝土层外表面的表观裂缝宽度约为130μm时,氯化物影响混凝土的深度随裂缝恢复率的增加而显着增加。

著录项

  • 来源
    《Materials and structures》 |2016年第8期|3217-3226|共10页
  • 作者单位

    Tongji Univ, Minist Educ, Key Lab Geotech & Underground Engn, Shanghai 200092, Peoples R China|Tongji Univ, Dept Geotech Engn, Shanghai 200092, Peoples R China;

    Tongji Univ, Minist Educ, Key Lab Geotech & Underground Engn, Shanghai 200092, Peoples R China|Tongji Univ, Dept Geotech Engn, Shanghai 200092, Peoples R China;

    Tongji Univ, Minist Educ, Key Lab Geotech & Underground Engn, Shanghai 200092, Peoples R China|Tongji Univ, Dept Geotech Engn, Shanghai 200092, Peoples R China;

    Tongji Univ, Minist Educ, Key Lab Geotech & Underground Engn, Shanghai 200092, Peoples R China|Tongji Univ, Dept Geotech Engn, Shanghai 200092, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Chloride penetration; Crack; Crack recovery; Reinforced concrete hollow pile; Centrifugal effect; Self-healing;

    机译:氯化物渗透;开裂;开裂恢复;钢筋混凝土空心桩;离心效应;自修复;

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