再生混凝土粗骨料在道路中的运用研究

发布时间：2019-01-03 12:17

【摘要】：近年来,随着经济的发展,我国公路事业蓬勃发展。然而公路养护的步伐却往往跟不上公路的建设步伐,从而导致各种公路病害的发生,较多高速公路出现了病害,比如唧泥、断板以及脱空等,当病害较严重的时候,通常要对道路进行大修。比较常见的方法就是把旧水泥混凝土路面敲碎去除,换用天然骨料来建新道路。然而这样不但会产生大量的废弃混凝土,而且也会占用大量的土地,对环境的污染也会日益加重,甚至会消耗大量的天然资源。因此,如何将废旧混凝土再生循环利用,对实现节约资源,保护环境意义重大。然而,由于我国经济发展起步较晚,对于再生骨料的再生运用研究与发达国家相比还是比较落后的,还处于起步的研究阶段。再生骨料分为再生粗骨料和再生细骨料,本文将以再生粗骨料为主要的研究对象。本文以当前各种材料的市场价格对再生骨料的经济及环境社会效益进行了分析,使用Ansys软件对不同砂浆强度等级配成的天然骨料混凝土或者再生骨料混凝土道路路面在汽车荷载的作用下计算其最大位移以及路面、路基、土基在汽车荷载的作用下位移的变化情况,主要内容如下： (1)通过查阅国内外再生混凝土在道路中的发展及运用情况,指出了国内外对再生骨料研究的差距,初步得出了再生混凝土路面发展中存在的问题。 (2)通过比较再生骨料和天然骨料性能差别来分析再生混凝土骨料的特征及部分基本性能,从而得出了再生骨料的三个特性。 (3)根据再生骨料的特性,从再生骨料的界面体积分数、砂浆界面与再生混凝土骨料等微观结构分析了再生骨料的界面特性。 (4)依据再生骨料的界面特征,提出了通过提高再生混凝土所使用的水泥浆强度的方法,使再生混凝土达到天然骨料混凝土的要求。然后从再生骨料的生产成本、再生混凝土的生产成本以及综合成本出发进行经济环境效益分析。 (5)运用Ansys软件来进行建模,通过汽车在温克勒地基上的板的瞬态动力下的竖向位移,得出了通过提高再生混凝土的水泥浆的强度来达到天然骨料混凝土的要求是可行的。
[Abstract]:In recent years, with the development of economy, our country highway enterprise vigorous development. However, the pace of highway maintenance often fails to keep pace with the pace of highway construction, which leads to the occurrence of various highway diseases. More highway diseases occur, such as mud jammers, broken slabs and voids, etc., when the diseases are more serious, Roads are usually overhauled. The common method is to crush old cement concrete pavement and replace it with natural aggregate to build new road. However, this will not only produce a large number of waste concrete, but also occupy a large number of land, environmental pollution will be increasingly serious, and even consume a large number of natural resources. Therefore, how to recycle waste concrete is of great significance to save resources and protect environment. However, due to the late start of economic development in China, the research on the recycling of recycled aggregate is still relatively backward compared with the developed countries, and is still in the initial stage of research. Recycled aggregate is divided into regenerated coarse aggregate and regenerated fine aggregate. In this paper, the economic and environmental benefits of recycled aggregate are analyzed based on the current market price of various materials. Using Ansys software to calculate the maximum displacement of natural aggregate concrete or recycled aggregate concrete road pavement with different mortar strength grade under the action of automobile load, as well as the road surface and subgrade, The main contents are as follows: (1) through consulting the development and application of recycled concrete in road at home and abroad, the gap of research on recycled aggregate at home and abroad is pointed out. The problems existing in the development of recycled concrete pavement are preliminarily obtained. (2) the characteristics and some basic properties of recycled concrete aggregate are analyzed by comparing the properties of recycled aggregate and natural aggregate, and three characteristics of recycled aggregate are obtained. (3) according to the characteristics of recycled aggregate, the interfacial characteristics of recycled aggregate are analyzed from the microstructure of the interface volume fraction of recycled aggregate, mortar interface and recycled concrete aggregate. (4) according to the interface characteristics of recycled aggregate, the method of improving the strength of cement slurry used in recycled concrete is put forward to make recycled concrete meet the requirement of natural aggregate concrete. Then the economic and environmental benefits are analyzed from the production cost of recycled aggregate, the production cost of recycled concrete and the comprehensive cost. (5) using Ansys software to model the model, through the vertical displacement of the automobile under the transient dynamic force of the slab on the Winkler foundation, it is concluded that it is feasible to meet the requirement of natural aggregate concrete by increasing the strength of the cement slurry of recycled concrete.
【学位授予单位】：广东工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

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