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Combined effects of vertical spacers and segregation on mass transport properties of reinforced concrete

机译：垂直间隔物和偏析对钢筋混凝土质量运输性能的综合作用

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摘要

All concrete structures contain reinforcement spacers, and deep sections can be affected by bleeding and segregation without displaying visible indications during casting. However, their effects on mass transport and long-term durability are not well studied. In this paper, reinforced concrete columns were prepared with plastic and cementitious spacers to achieve 50 mm cover, and compacted at different vibration frequencies and durations. 28d cured samples were extracted along the height, conditioned to equilibrium (21 degrees C, 75% RH or 50 degrees C, 7% RH), and then subjected to water absorption, electrical conduction, epoxy impregnation and fluorescence imaging. Samples from the top of the column consistently gave higher accessible porosity and mass transport compared to samples from the bottom. Presence of spacers caused additional increases in mass transport because of preferential flow through the spacer-concrete interface which is more porous and microcracked compared to bulk concrete farther away. Image analysis on cross-sections showed that the columns experienced some aggregate segregation despite care taken to avoid over-compaction. The resistance of concrete to ingress of aggressive agents decreases with increasing height due to the combined negative effects of reinforcement spacers and segregation.
机译：所有混凝土结构含有加强垫片，深部可以通过出血和分离来影响，而不会在铸造期间显示可见的指示。然而，它们对大规模运输和长期耐久性的影响并未得到很好的研究。在本文中，用塑料和水泥间隔物制备钢筋混凝土柱，以实现50毫米盖，并在不同的振动频率和持续时间内压实。将28d固化样品沿着高度提取，调节到平衡（21℃，75％RH或50℃，7％RH），然后进行吸水，导电，环氧浸渍和荧光成像。与来自底部的样品相比，来自列顶部的样品一致地给出了更高的可接近孔隙率和质量传输。间隔物的存在由于优先流过间隔混凝土界面而导致质量传输的额外增加，这与散装混凝土更远的散装混凝土更加多孔和微裂纹。横截面上的图像分析表明，尽管小心避免过压缩，但柱子经历了一些聚集体隔离。由于增强间隔物和偏析的综合负面影响，混凝土对侵蚀剂入口的抗性降低了高度。

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  • 来源
    《Materials and structures》 |2020年第6期|151.1-151.17|共17页
  • 作者

    Muslim F.; Wong H. S.; Cheng G.; Alexandrou C.; Liu B.; Buenfeld N. R.;

  • 作者单位

    Imperial Coll London Ctr Infrastruct Mat Dept Civil & Environm Engn London SW7 2AZ England|Univ Indonesia Fac Engn Civil Engn Dept Kampus UI Depok 16424 Indonesia;

    Imperial Coll London Ctr Infrastruct Mat Dept Civil & Environm Engn London SW7 2AZ England;

    Imperial Coll London Ctr Infrastruct Mat Dept Civil & Environm Engn London SW7 2AZ England;

    Imperial Coll London Ctr Infrastruct Mat Dept Civil & Environm Engn London SW7 2AZ England;

    Imperial Coll London Ctr Infrastruct Mat Dept Civil & Environm Engn London SW7 2AZ England;

    Imperial Coll London Ctr Infrastruct Mat Dept Civil & Environm Engn London SW7 2AZ England;

  • 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

    Reinforcement spacer; Segregation; Bleeding; Spacer-concrete interface; Transport properties; Durability;

    机译：加强垫片;隔离;出血;间隔混凝土界面;运输特性;耐用性;

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