铁尾矿砂水泥混凝土路用性能研究

发布时间：2018-02-08 08:35

本文关键词： 铁尾矿砂水泥混凝土抗折强度路用性能干缩性抗冻性耐磨性　出处：《大连理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：进入二十一世纪以来,我国进入了一个快速发展的阶段,同时迈入了一个快速建设的时期,钢材和混凝土的需求量是最大的,在开采铁矿的过程中,也产生了大量的铁尾矿砂,一种工业废弃物,与此同时,混凝土的细骨料,砂也出现了紧缺的危险信号。过去二十年间,没有把环保的概念放到生产的过程中,铁尾矿砂随意堆放,破坏环境,占用土地。十八大胜利召开之后,把生态文明建设作为国家一项很重要的任务来做,把环保拉进人民生活中来。而且为了节约资源,变废为宝,把一切可以利用的资源都充分利用起来,促进我国可持续发展顺利快速的进行,让我国经济又好又快的发展。本论文研究把铁尾矿砂作为细集料应用到道路路面中去,在现在国家实施“村村通”的政策下,铁尾矿砂混凝土路面将会得到大范围的应用,这样不仅可以解决铁尾矿污染环境的问题,而且可以解决混凝土细集料资源短缺的问题,还可以降低工程成本,具有很大的社会与经济价值。试验采用砂混凝土和用铁尾矿砂混凝土作对比。为了满足铁尾矿砂水泥混凝土的工作性,需添加外加剂——萘系高效减水剂,在抗压强度、抗折强度、抗弯拉回弹模量、干缩性、耐磨性、抗冻性等工作性能和力学性能方面作对比,并考虑经济效益。在试验中,测的抗折强度为4.0MPa的混凝土为C30,抗弯拉弹性模量为2600MPa与规范推荐值2700MPa相差不大。混凝土铁尾矿砂混凝土与普通混凝土相比,干缩率比较接近,磨损量相差不大,抗冻性略差,且具有比较好的经济效益。
[Abstract]:Since 21th century, China has entered a stage of rapid development and entered a period of rapid construction. The demand for steel and concrete is the largest, and a large number of iron tailings have been produced in the process of mining iron ore. A kind of industrial waste, at the same time, concrete fine aggregate, sand also appeared to be in short supply danger signal. In the past 20 years, the concept of environmental protection has not been put into production process, iron tailings are stacked at will to destroy the environment. Occupation of land. After the 18 victory, the construction of ecological civilization was regarded as a very important task for the country, and environmental protection was drawn into the lives of the people. Moreover, in order to save resources and turn waste into treasures, Make full use of all available resources to promote the smooth and rapid development of China's sustainable development, so that China's economy is sound and rapid development. This paper studies the application of iron tailings as fine aggregate to road surface. Under the present state policy of "connecting villages and villages", the concrete pavement of iron tailings will be widely used. This will not only solve the problem of environmental pollution caused by iron tailings, but also solve the problem of the shortage of concrete fine aggregate resources. Still can reduce project cost, have very big social and economic value. Sand concrete and iron tailings concrete are used as contrast. In order to satisfy the workability of iron tailings cement concrete, it is necessary to add the admixture-naphthalene series superplasticizer, in the compressive strength, flexural strength, flexural tensile resilience modulus. The dry shrinkage, wear resistance and freezing resistance are compared with the mechanical properties, and the economic benefits are considered. In the test, the concrete with the flexural strength of 4.0 MPA is C30, the modulus of elasticity of flexural tension is 2600MPa and the recommended value of code is 2700MPa. The frost resistance is a little bad, and has good economic benefit.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414;X753

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