煤矸石混凝土的研制及其性能测试

发布时间：2018-06-23 08:30

本文选题：煤矸石混凝土 + 正交试验　；参考：《安徽理工大学》2014年硕士论文

【摘要】：煤矸石是煤炭行业产生的工业废物之一,对生态环境和社会环境都构成了严重的威胁。目前我国现有煤矸石储量巨大,煤矸石的储量的年增长率逐年上升。如不采取高效的、节能环保的措施对煤矸石进行快速的吸纳,将对社会效益、经济效益和环境效益带来不可弥补的损失。利用煤矸石作为混凝土集料来生产普通混凝土,一方面可以大量吸纳煤矸石,另一方面可以显著地减少建筑工程中对天然集料的使用量,具有较好的经济效益和社会效益。目前我国正处于快速发展的关键阶段,大兴土木,各类基础设施亟需完善,在高速建设的同时,能源危机、环境污染、生态破坏等问题相继涌现。借此契机,作者对用煤矸石代替天然石子作为普通混凝土的粗骨料的可行性进行了研究,作者查阅了大量文献发现,对煤矸石集料混凝土的研究不多,基于种种原因,对煤矸石集料混凝土的研究显得非常紧迫。文章主要采用以下几个思路对煤矸石集料混凝土进行了研究： (1)查阅了大量关于淮南矿区煤矸石特性的资料文献,对煤矸石的周期特性有了大体地认识。 (2)对淮南矿区的煤矸石的部分性质进行了试验研究,并运用规范及煤矸石混凝土的强度理论对煤矸石进行了评价。 (3)运用正交试验的方法确定了C30混凝土的最佳配合比。 (4)通过抗冻性试验对煤矸石混凝土的耐久性进行了简单的研究。文章的研究作为煤矸石的再生利用可能途径之一,作者通过以上思路的研究初步得出以下结论： (1)通过对煤矸石集料混凝土的强度理论分析发现其破坏机理是“弱”包“强”转变为“强”包“弱”,通过试验发现煤矸石集料混凝土的适配强度是C30以下。 (2)根据集料-基体协调性理论,基体浆体的强度为中强基体,最大粒径为20mm颗粒级配的煤矸石混凝土的试验结果要比最大粒径为31.5mm、l0mm的颗粒级配煤矸石混凝土的试验结果好。 (3)利用正交试验得出最优配合比因素水平为：水胶比w/c=0.5,煤矸石掺量为60%,煤矸石最大粒径为20mm。 (4)利用最优配合比为基准组进行耐久性试验,试验对比分析结果为煤矸石掺量60%最优配合比下的煤矸石集料混凝土的抗冻性能最好。
[Abstract]:Coal gangue is one of the industrial wastes produced by the coal industry, which poses a serious threat to the ecological environment and social environment. At present, the existing coal gangue reserves in China are huge, the annual growth rate of coal gangue reserves is increasing year by year. If the coal gangue is not absorbed quickly by the measures of high efficiency, energy saving and environmental protection, it will bring irreparable losses to the social, economic and environmental benefits. The use of coal gangue as concrete aggregate to produce ordinary concrete can absorb large amount of coal gangue on the one hand, on the other hand, it can significantly reduce the use of natural aggregate in construction engineering, which has good economic and social benefits. At present, our country is in the critical stage of rapid development, great construction, all kinds of infrastructure need to be improved, energy crisis, environmental pollution, ecological damage and other problems have emerged. Taking this opportunity, the author studies the feasibility of using coal gangue instead of natural stone as coarse aggregate of ordinary concrete. After consulting a large number of documents, the author finds that there are few researches on coal gangue aggregate concrete for various reasons. The study of coal gangue aggregate concrete is very urgent. This paper mainly uses the following ideas to study the coal gangue aggregate concrete: (1) consulting a large number of documents about the characteristics of coal gangue in Huainan mining area, The periodic characteristics of coal gangue are generally understood. (2) some properties of coal gangue in Huainan mining area are studied experimentally. The standard and the strength theory of coal gangue concrete are used to evaluate the coal gangue. (3) the optimum mix ratio of C30 concrete is determined by orthogonal test. (4) the coal gangue is evaluated by freezing resistance test. The durability of stone concrete is studied simply. The research of this paper is one of the possible ways to regenerate coal gangue. The author draws the following conclusions: (1) through the theoretical analysis of the strength of coal gangue aggregate concrete, it is found that the failure mechanism of the concrete is "weak" and "strong" to "strong" and "weak". It is found that the suitable strength of coal gangue aggregate concrete is less than C30. (2) according to the theory of aggregate and matrix coordination, the strength of matrix slurry is medium strong matrix. The test results of coal gangue concrete with maximum particle size of 20mm particle gradation are better than those of coal gangue concrete with maximum particle size of 31.5 mm / 10 mm. (3) the optimum proportion factor level is obtained by orthogonal test. The results are as follows: water / binder ratio w / c0. 5, coal gangue content 60 and maximum coal gangue diameter 20mm. (4) durability test is carried out by using the optimal mix ratio as the benchmark group, the content of coal gangue is 60 and the maximum particle size of coal gangue is 20mm. The test results show that the coal gangue aggregate concrete with 60% coal gangue content has the best frost resistance.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU528

【参考文献】