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首页> 外文会议>The 22nd International Conference on Solid Waste Technology and Management(ICSW 2007) >EFFECT OF REPLACEMENT OF AGGREGATES BY DEMOLITION WASTE ON CONCRETE PROPERTIES
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EFFECT OF REPLACEMENT OF AGGREGATES BY DEMOLITION WASTE ON CONCRETE PROPERTIES

机译：分解废料代替骨料对混凝土性能的影响

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Over the years there has been a change in the use of building materials. Cheap & locally available materials such as moulded earth bricks, stone, thatch, timber, steel, aluminium, plastics and fibers of various types and forms have replaced the traditional costly materials. However, all these materials have been developed to meet specific requirements of climate, availability of skilled labor and specific raw materials to affect the desired economy. Demolition of old structures to make way for new and modern ones is a common feature in metropolitan areas due to rapid urbanization. In many areas, good quality aggregates are not available locally, whereas in some others with rapid urban expansion, aggregate plants have been forced to close down because of enforcement of environmental laws. In such instances it becomes necessary to transport aggregates with the resultant disadvantages. Concrete debris was broken into pieces of about 40 to 75mm by using demolishing hammer. After wards the concrete was fed into the jaw crusher and crushed. The fraction, greater than 4.75mm was considered as coarse aggregate and less than 4.75mm was considered as fine aggregate. Thus, the waste obtained from demolition of structures could be converted into resources for new construction.rnThe present paper makes an effort to prove that the waste from the demolition of structures is supplementary to the housing industry. Recent research indicates that the concrete obtained from the demolition waste can be used to produce aggregates, which in turn can be used for making new concrete of acceptable quality. The Coarse and fine aggregates obtained from recycling the demolition waste can be effectively used for mass concrete in foundation as well as in flooring with great economy. This will not only reduce the transportation costs of aggregates but would also provide a viable solution to the nuisance of the waste obtain from demolition of structures. Design of M_(15) and M_(20) concrete mixes using these aggregates were carried out. Four mixes of recycled concrete waste i.e. fine aggregate and coarse aggregate, were designed and tested for their compressive strength. The experimental results show that the recycled concrete waste aggregates can be effectively used to replace the natural aggregates in concrete.
机译：多年来，建筑材料的使用发生了变化。廉价和本地可用的材料，例如模制的土砖，石材，茅草，木材，钢，铝，塑料和各种类型和形式的纤维，已取代了传统的昂贵材料。但是，已经开发了所有这些材料以满足气候的特定要求，熟练劳动力的可获得性以及影响所需经济的特定原材料。由于快速的城市化，大都市地区的常见特征是拆除旧结构，以便为新的和现代的结构腾出空间。在许多地区，当地没有高质量的骨料，而在其他一些城市发展迅速的地区，由于执行环境法律，骨料工厂被迫关闭。在这种情况下，有必要运输集料，从而产生不利的后果。使用拆除锤将混凝土碎片破碎成约40至75mm的碎片。病房结束后，将混凝土送入颚式破碎机并进行破碎。大于4.75mm的部分被认为是粗骨料，小于4.75mm的部分被认为是细骨料。因此，拆除建筑物所产生的废物可以转化为用于新建筑的资源。本文试图证明拆除建筑物所产生的废物是对房屋工业的补充。最近的研究表明，从拆迁废料中获得的混凝土可用于生产集料，而集料又可用于制造质量合格的新混凝土。回收废料回收得到的粗细骨料可有效地用于基础混凝土以及经济型地板中的大体积混凝土。这不仅将减少骨料的运输成本，而且将为从拆迁中获得的废物造成的麻烦提供可行的解决方案。使用这些骨料进行了M_（15）和M_（20）混凝土配合料的设计。设计并测试了四种再生混凝土废料的混合物，即细骨料和粗骨料。实验结果表明，再生混凝土废骨料可以有效地代替混凝土中的天然骨料。

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