本科生毕业论文
题 目：不同水固比砂浆的填隙系数对混凝土性能的影响 英文题目：Effect of Different water-solid ratio mortar of
interstitial coefficient on the concrete performance
学 院： 材料科学与工程学院 专 业： 材料化学 班 级： 姓 名： 学 号： 指导教师：
2011年6月14日
摘 要
摘 要
混凝土的高速发展，使得不可再生的天然砂数量锐减，人工砂代替天然砂将成为必然趋势。铁尾矿的堆存不仅危害环境，还存在安全隐患。为解决天然砂的短缺和铁尾矿的危害这一对矛盾，利用铁尾矿砂为基本原材料，通过研究不同水固比下铁尾矿砂浆的流动性，用其填隙碎石，配制混凝土，通过研究铁尾矿混凝土的流动性和强度，探索铁尾矿混凝土成为泵送混凝土的可行性。试验研究发现，唐山迁安地区的铁尾矿砂属于中砂，级配较好，可以用来代替天然砂制作流动性较好的砂浆。并且用不同水固比的铁尾矿砂浆填隙碎石，配制来的铁尾矿砂混凝土，流动性好，可满足不同强度要求。结果表明，强度 C20，C25，C30，C35，C40的铁尾矿混凝土流动性好，强度达标，坍落度在165mm-220mm之间，所以，用铁尾矿砂完全可以配制出符合标准要求的建筑混凝土，最大限度地利用了铁尾矿，为铁尾矿的开发利用开拓了新的渠道。
关键词：铁尾矿砂，水固比，混凝土性能
Abstract
Abstract
The rapid development of concrete, making the number of non-renewable natural sand dropped, manual sand instead of natural sand will become an inevitable trend. Iron tailings dumps is not only harmful to the environment, but also a security risk. In order to address the shortage of natural sand and iron ore tailings on the dangers of this conflict, the use of iron tailings as the basic raw materials, through the solid ratio of different water mortar under liquid iron ore tailings, with the interstitial gravel, preparation of concrete. By studying the flow of iron ore tailings and strength of concrete to explore the possibility of iron ore tailings pumping concrete into the feasibility of concrete. Though study, Tangshan Iron Qian'an area is in the sand tailings, grading is better, can be used to replace natural sand making good fluidity mortar. And with different water-solid ratio of iron ore tailings interstitial mortar rubble, preparing to iron tailings concrete, fluidity, and can meet different strength requirements. The results showed that the strength of C20, C25, C30, C35, C40 of the iron ore tailings concrete fluidity, strength standards, and the range of slump is in 165mm-220mm. Therefore, complete with iron mine tailings can be prepared to meet standards of construction of concrete, also acquire the maximum use of the iron tailings, making the development and utilization of iron tailings develop a new channel.
Key Words：iron tailings ,water-solid ratio, concrete performance
目 录
目 录
摘 要.............................................................................................................................. I Abstract ......................................................................................................................... II 引 言.............................................................................................................................. 1 第一章 综述.................................................................................................................. 2
1.1 细集料资源的利用现状.................................................................................. 2
1.1.1 天然砂资源短缺及造成的影响............................................................ 2 1.1.2 人工砂代替天然砂的必然趋势............................................................ 2 1.1.3 人工砂配制混凝土的研究进展............................................................ 2 1.2 铁尾矿资源的利用现状.................................................................................. 3
1.2.1铁尾矿的产出及堆置的危害................................................................. 3 1.2.2 铁尾矿的综合利用................................................................................ 4 1.3建筑砂浆概述及发展趋势............................................................................... 5 1.4传统混凝土施工现状....................................................................................... 7 1.4.1施工中的问题................................................................................................ 7 1.4.2研究水固比与填系的意义：........................................................................ 7 1.5存在的问题....................................................................................................... 8 第二章 试验研究方案.................................................................................................. 9
2.1研究思路........................................................................................................... 9 2.2技术路线........................................................................................................... 9 2.3试验原材料及仪器设备................................................................................. 10
2.3.1水泥....................................................................................................... 10 2.3.2铁尾矿砂与碎石................................................................................... 10 2.3.3试验用水及药品................................................................................... 11 2.3.4实验仪器设备....................................................................................... 11 2.4试验方法......................................................................................................... 12
2.4.1粗细集料基本性质测定....................................................................... 12
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目 录
2.4.2铁尾矿砂和碎石基本性质的测定....................................................... 12 2.4.3水泥基本性质的测定........................................................................... 14 2.4.4水泥净浆试验方法............................................................................... 14 2.4.5铁尾矿砂浆试验方法........................................................................... 14 2.4.6铁尾矿砂浆混凝土试验方法............................................................... 15
第三章 试验结果与分析讨论.................................................................................. 17
3.1粗细集料基本性质......................................................................................... 17 3.2混凝土配合比设计方法................................................................................. 17 3.3水泥的性质..................................................................................................... 18 3.4铁尾矿砂浆试验结果与分析......................................................................... 18 3.5铁尾矿砂浆混凝土试验结果与分析............................................................. 18
3.5.1铁尾矿砂浆混凝土坍落度的测定....................................................... 18 3.5.2铁尾矿砂浆混凝土坍落度的测定....................................................... 20
结 论............................................................................................................................ 23 参考文献...................................................................................................................... 24 谢 辞............................................................................................ 错误！未定义书签。
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