【作者】 郭瑞亮；

【导师】 李志国；

【作者基本信息】 天津大学 ， 结构工程， 2009， 硕士

【摘要】 随着城市化进程的加快,建筑垃圾也与日俱增。过去50年,我国至少生产了200×10~9m~3粘土砖制品,陆续将转化为建筑固体废弃物。巨量废弃物的处理除了费用惊人外,还会引发很严重的环境问题。另外,混凝土的巨额需求也需要大量的砂石集料,而随着天然砂石的不断开采,天然集料资源也日益枯竭。基于环境保护和可持续发展思想的再生混凝土技术将可以很好的解决这一难题。城市建筑垃圾资源化处理是20世纪90年代以来发达国家环境保护和可持续发展的战略目标之一。利用拆迁后的废粘土砖砌体加工再生集料用于生产水泥混凝土制品和其他建筑材料是资源化利用的主要途径,在建筑垃圾排放费用很高且天然集料资源较紧缺的国家(地区),利用附加值会更高。本文概述了再生混凝土和再生砂浆对环境的影响以及其在国内外的研究状况。通过对目前国内获取再生集料的方法进行分析,并借鉴国外机械破碎方式,采用鄂式破碎机来制取再生粘土砖集料。进行了砖混结构建筑物垃圾估算方法,和再生集料的生产方式和生产模式进了探讨。对再生粘土砖集料性质的测定,重点分析了再生粗集料的粒形元素。改变全级配再生粘土砖集料混凝土中的附加水量、粉煤灰取代率、调整粗集料级配,研究再生混凝土的新拌性能及其抗压强度和弹性模量。通过对粘土砖破碎筛成4.75mm以下的砖粉配制成砂浆的可行性进行了初步的研究。为进一步研究全级配粘土砖集料的应用提供了依据。粘土砖集料砂浆更多还原

【Abstract】 With the speeding up of the process of urbanization,wastes of construction have been growing day by day.In the past fifty years. Over the past 50 years, at least 200 billion cubic meters of production of clay brick product which will mostly be converted to solid waste.Besids the charge for the jillion wastes disposal is very high,it also causes a lot of environmental problems.In addition,the large demand of concrete requests the exploritation of natural resoures--sand and stone,and so the natural resource has been on the exhausted edge for unceasing exploration.Then based on the thought of environmental protection and sustainable development,the technology of recycled concrete can solve this problem efficiently. Since the 1990s, urban construction waste disposal and resource is one of the strategic objectives of environmental protection and sustainable development in developed contry. Broken the demolition clay brick masonry into oarse and fine crushed bricks as regeneration aggregate in the production of cement concrete products and other building materials is the main approach.In the country (region) where the nature aggregate resource is short, the cost of utilization waste discharge is high in construction ,use value will be higher.This paper summarizes that recycled concrete and receycled mortar brings the influence to the environment.it’s domestic and international research status.This paper mainly studies feature and the basic application of coarse and fine crushed bricks as aggregate.Through analysis of the method that is currently used on how to gain recycled concrete aggregate and then after drawing lessons on processing manner of waste concrete from abroad,jaw crusher is used to produce recycled aggregate. This paper also discussed on the mehods of quality of demolition waste and the production style and model of recycled aggregate.This paper analyzed the properties of coarse and fine crushed bricks as aggregate and emphatically analyzed grain shape elements of recyecled aggregate.Through changing the additional water、different substitutive percent of fly ash and adjustment of recycled coarse aggregate gradation in concrete,the workability of fresh concret、the compressive strength and elastic modulus have been researched. The preliminary feasibility which crushed brick powder can be used to replace all of natural sand in making mortar is researched. Through screening for breaking a 4.75 mm fine aggregate made into mortar ,this paper studies the feasibility of the preliminary.This paper offers some references for further research on use of fully-graded coarse and fine crushed bricks as recycled aggregate.更多还原