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首页> 外文期刊>Magazine of Concrete Research >Surface modified used rubber tyre aggregates: effect on recycled concrete performance
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Surface modified used rubber tyre aggregates: effect on recycled concrete performance

机译:表面改性的旧橡胶轮胎骨料:对再生混凝土性能的影响

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摘要

Although research has found that using rubber in concrete will enhance its resilience and reduce its density, the significant loss of strength owing to lack of bonding has remained unresolved. This study considers how to minimise the loss of strength of concrete with used rubber tyre crumb aggregates and investigates the improvement of water permeability resistance that may consequentially develop. A surface of rubber crumb was modified by soaking in the saturated sodium hydroxide solution or silane coupling agent (SCA) before using. Up to 20% of natural fine aggregate was volumetrically replaced with treated rubber crumb. Experimental results show higher compressive and flexural strengths, Young's modulus and water permeability resistance from the samples with SCA-treated rubber than with as-received or sodium-hydroxide-treated rubber. X-ray diffraction pattern analyses indicate almost no change in crystalline phase for the rubber surface modification. Microscopic inspections show an enhanced rubber-matrix adhesion with the use of SCA. Results of mercury intrusion porosimetry reveal that concrete with SCA-treated rubber has a similar pore size distribution to the other three mixes, but achieves the lowest porosity and highest tortuosity, resulting in the best water permeability resistance. A brief cost analysis suggests that this method of surface modification is economically viable.
机译:尽管研究发现在混凝土中使用橡胶会增强其回弹力并降低其密度,但由于缺乏粘合力而导致的强度显着下降仍未解决。这项研究考虑了如何最大程度地减少使用过的橡胶轮胎碎屑骨料造成的混凝土强度损失,并研究可能因此而产生的耐水渗透性的提高。使用前,将橡胶屑表面浸入饱和氢氧化钠溶液或硅烷偶联剂(SCA)中进行改性。多达20%的天然细骨料被体积处理过的橡胶屑替代。实验结果表明,使用SCA处理过的橡胶的样品的抗压强度和抗弯强度,杨氏模量和耐水渗透性均高于原样或氢氧化钠处理的橡胶。 X射线衍射图分析表明,橡胶表面改性的结晶相几乎没有变化。显微镜检查显示,使用SCA可以增强橡胶基质的附着力。压汞法的结果表明,用SCA处理过的橡胶的混凝土具有与其他三种混合料相似的孔径分布,但孔隙率最低,曲折度最高,因此具有最佳的耐水渗透性。简短的成本分析表明,这种表面改性方法在经济上是可行的。

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  • 来源
    《Magazine of Concrete Research》 |2015年第12期|680-691|共12页
  • 作者单位

    Shanghai Jiao Tong Univ, Sch Naval Architecture Ocean & Civil Engn, Shanghai 200030, Peoples R China|Univ Birmingham, Sch Civil Engn, Birmingham B15 2TT, W Midlands, England;

    Shanghai Jiao Tong Univ, Sch Naval Architecture Ocean & Civil Engn, Shanghai 200030, Peoples R China|Univ Birmingham, Sch Civil Engn, Birmingham B15 2TT, W Midlands, England;

    Univ Birmingham, Sch Civil Engn, Birmingham B15 2TT, W Midlands, England;

    Univ Birmingham, Sch Civil Engn, Birmingham B15 2TT, W Midlands, 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
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