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首页> 外文会议>International Conference on Advances in Building Technology Vol.2, Dec 4-6, 2002, Hong Kong, China >IMPROVE THE QUALITY OF CONSTRUCTION AND DEMOLITION WASTE BY SEPARATION TECHNIQUES
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IMPROVE THE QUALITY OF CONSTRUCTION AND DEMOLITION WASTE BY SEPARATION TECHNIQUES

机译：通过分离技术提高建筑和拆除废物的质量

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摘要

In the Netherlands, each year about 16 million tons of construction and demolition waste (CDW) is produced, which locally is the largest solid waste stream. Nowadays, about 90% (by weight) of construction and demolition waste is being reused. However, most of it is reused in road foundations, embankments, and so on. Therefore, construction and demolition waste is still recycled in relatively low technical applications. In order to recycle CDW at a high technical level, the two main materials from CDW―concrete rubble and brick (masonry) rubble―should be recycled/reused in the concrete industry and in the brick industry respectively, and proper quality control is an important step to ensure qualified products without environmental risks. This study focuses on effective separation techniques to improve the quality of CDW, based on differences in physical properties and chemical compositions between concrete/mortar and brick. In the laboratory study, both dry and wet separation techniques were used to obtain concentrates of concrete/mortar rubble and brick rubble. The results show that magnetic separation, jigging, spiral separation, and color separation can be successfully applied for treating construction and demolition waste, and clean products can be obtained of satisfactory.
机译：在荷兰，每年产生约1600万吨的建筑和拆除废物（CDW），这在当地是最大的固体废物流。如今，约有90％（按重量计）的建筑和拆除废物被再利用。但是，大多数都可以在路基，路堤等中重复使用。因此，建筑和拆除废物仍在相对较低的技术应用中进行回收。为了以较高的技术水平回收CDW，CDW的两种主要材料-混凝土瓦砾和砖瓦（砖石）瓦砾-应该分别在混凝土行业和砖瓦行业回收/再利用，适当的质量控制是重要的确保没有环境风险的合格产品的步骤。这项研究基于混凝土/砂浆和砖块之间物理性质和化学成分的差异，着重于有效的分离技术以提高CDW的质量。在实验室研究中，干法和湿法分离技术均用于获得混凝土/砂浆碎石和砖瓦砾的浓缩物。结果表明，磁分离，夹具，螺旋分离和分色技术可以成功地应用于建筑垃圾和拆除废物的处理，并且可以获得满意的清洁产品。

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