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Separation studies of concrete and brick from construction and demolition waste

机译：混凝土和砖瓦与建筑和拆除废物的分离研究

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摘要

The quality of recycled aggregates from construction and demolition waste (CDW) is strictly related to the content of porous and low strength phases and is specifically related to the high content of brick particles, despite representing approximately 50 wt.% of the total recycled aggregates. This paper focus on air jigging separation studies for removing brick particles from recycled construction and demolition waste aggregates. The operational parameters were achieved by studying the aggregate movement trajectories based on the small specific density differences of 2.52 g/cm(3) and 1.97 g/cm(3). Separation tests were conducted with a binary mixture of concrete and brick particles ranging from 5 to 10 mm for three operational parameters. The attained results confirmed that the brick fraction increases the water absorption and compromises the consistency and strength of the recycled aggregates. The proposed air jigging separation method was effective at reducing brick particle content and producing significant recycled concrete aggregates with a purity of 95 wt.%, paving the way for greater use of recycled aggregates in high grade applications, such as concrete and pavement layers. (C) 2019 Elsevier Ltd. All rights reserved.
机译：尽管来自建筑和拆除废物（CDW）的再生骨料的质量约占总再生骨料的50％（重量），但其质量与多孔相和低强度相的含量密切相关，尤其与砖颗粒的高含量有关。本文致力于空气夹具分离研究，以从回收的建筑和拆除废料中去除砖块。通过研究基于2.52 g / cm（3）和1.97 g / cm（3）的较小的比密度差的聚集运动轨迹来获得操作参数。对于三个操作参数，使用5到10毫米范围内的混凝土和砖颗粒的二元混合物进行分离测试。所获得的结果证实了砖的比例增加了吸水率并且损害了回收骨料的稠度和强度。所提出的空气夹具分离方法可有效减少砖粒含量并产生纯度为95 wt。％的大量再生混凝土骨料，为在混凝土和路面等高级应用中更多地使用再生骨料铺平了道路。 （C）2019 Elsevier Ltd.保留所有权利。

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  • 来源
    《Waste Management》 |2019年第2期|396-404|共9页
  • 作者

    Hu Kui; Chen Yujing; Naz Falak; Zeng Changnv; Cao Shihao;

  • 作者单位

    Henan Univ Technol, Coll Civil Engn & Architecture, Zhengzhou 450001, Henan, Peoples R China|Henan Univ Technol, Natl Engn Lab Wheat & Corn Further Proc, Zhengzhou 450001, Henan, Peoples R China;

    Henan Univ Technol, Coll Civil Engn & Architecture, Zhengzhou 450001, Henan, Peoples R China;

    Henan Univ Technol, Coll Civil Engn & Architecture, Zhengzhou 450001, Henan, Peoples R China;

    Henan Univ Technol, Coll Civil Engn & Architecture, Zhengzhou 450001, Henan, Peoples R China|Henan Univ Technol, Natl Engn Lab Wheat & Corn Further Proc, Zhengzhou 450001, Henan, Peoples R China;

    Henan Univ Technol, Coll Civil Engn & Architecture, Zhengzhou 450001, Henan, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Construction and demolition waste (CDW); Recycling technology; Concrete/brick separation; Air jigging;

    机译：建筑和拆除废物（CDW）;回收技术;混凝土/砖块分离;空气夹具;

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