煤矸石玻化微珠保温混凝土的基本力学性能试验研究

发布时间：2018-06-26 05:57

本文选题：煤矸石 + 玻化微珠　；参考：《太原理工大学》2017年硕士论文

【摘要】：煤矸石作为煤炭开采过程中的附加产物,是一种强度性能介于煤炭和天然石子之间的物质,若不能加以有效利用,不仅会占用大量的土地资源,而且也会对周围的水资源和大气环境带来一定程度的影响。将煤矸石作为混凝土的骨料配制混凝土是有效利用煤矸石的一种途径;本文所研究的课题正是基于目前我国乃至全球对节能、绿色、环保理念的大力倡导,将煤矸石掺入玻化微珠保温混凝土(下文简称TIC)中作粗骨料,成功的配制出了强度等级为C30~C45、导热系数为0.4978~0.7840W/(m·K)的煤矸石玻化微珠保温混凝土(下文简称CGTIC)这种新型绿色建筑材料。CGTIC作为一种全新的建筑材料,其诸多特性和性能尚不得而知,因此本文主要依据《普通混凝土力学性能试验方法标准》(GB/T50081-2002)对其包括立方体抗压强度、轴心抗压强度、静力受压弹性模量、抗折强度、劈裂抗拉强度等在内的各项基本力学性能进行了试验探索研究,具体开展的研究工作如下:(1)参考了普通混凝土和TIC的配合比对CGTIC的配合比进行了设计,并经过一系列试配过程最终配制出了符合预期标准的混凝土,确定了5种不同煤矸石掺量的保温混凝土的配合比。(2)对5种不同煤矸石掺量的保温混凝土的各项基本力学性能进行了试验研究,发现其破坏形态与破坏机理与普通混凝土和TIC存在着较大的差异,CGTIC在外界荷载作用下的破坏不仅仅发生在传统的薄弱区域——粗骨料与水泥浆胶体的接触面上,同时煤矸石这种粗骨料本身也发生了破坏。(3)在基本力学性能试验的基础上分析研究了CGTIC的各项性能受煤矸石掺量的影响规律和其立方体抗压强度随龄期发展的变化规律。结果表明CGTIC的各项基本力学性能均随着煤矸石掺量的增加有着不同程度的降低,这主要是由煤矸石本身强度较低、节理发育、针片状含量较多等原因造成的,其中煤矸石的掺量对劈裂抗拉强度的影响最为显著;其立方体抗压强度随着龄期增加呈现先快后慢的发展规律,与煤矸石掺量关系不大,并且属于早强混凝土。(4)运用有限元软件ANSYS对CGTIC的框架结构进行了静力作用下的模拟分析,发现其不仅能减轻结构自重、提升结构安全性能,而且可以降低结构中产生的应力、减小配筋率。(5)对CGTIC的直接经济效益、综合社会效益以及环境效益进行了分析,结果表明将其用于实际建筑工程中不仅可行,而且在诸多方面都有着显著的效益。
[Abstract]:As an additional product in the process of coal mining, coal gangue is a kind of material whose strength performance is between coal and natural stone. If it can not be used effectively, it will not only occupy a lot of land resources. And will also have a certain degree of impact on the surrounding water resources and atmospheric environment. Using coal gangue as aggregate of concrete to prepare concrete is a way to make effective use of coal gangue. The research topic in this paper is based on the idea of energy saving, green and environmental protection in our country and the whole world. Mixing coal gangue into glass microbead insulation concrete (TIC) as coarse aggregate, The coal gangue vitrified microbead insulation concrete (CGTIC), a new green building material, has been successfully prepared with strength grade C30C45 and thermal conductivity 0.4978 ~ 0.7840W / (m K) as a new kind of building material. Many of its properties and properties are still unknown. Therefore, according to the standard of test methods for mechanical properties of ordinary concrete (GBP / T50081-2002), this paper mainly deals with the cube compressive strength, axial compressive strength, static compressive elastic modulus, flexural strength. The basic mechanical properties, such as splitting tensile strength and so on, are tested and studied. The specific research work is as follows: (1) the CGTIC mixture ratio is designed with reference to the mix ratio of ordinary concrete and TIC. And after a series of trial mixing process, the concrete that meets the expected standard was finally prepared. The mixing ratio of five kinds of insulating concrete with different content of coal gangue is determined. (2) the basic mechanical properties of five kinds of thermal insulation concrete with different content of coal gangue are studied experimentally. It is found that there is a great difference between the failure form and failure mechanism of CGTIC and that of ordinary concrete and TIC. The failure of CGTIC under external load is not only on the contact surface between coarse aggregate and cement slurry colloid, but also on the traditional weak area. At the same time, the coarse aggregate of coal gangue itself has also been destroyed. (3) on the basis of the basic mechanical property test, the influence of coal gangue content on the properties of CGTIC and the variation law of its cube compressive strength with the development of age are analyzed and studied. The results show that the basic mechanical properties of CGTIC decrease in varying degrees with the increase of coal gangue content, which is mainly caused by the low strength of gangue itself, the development of joints and the increase of needle content. The effect of coal gangue content on the splitting tensile strength is the most significant, and the cube compressive strength shows the development law of fast first and then slow with the increase of age, which has little relation to the content of coal gangue. And it belongs to early strength concrete. (4) the static simulation analysis of CGTIC frame structure is carried out by using finite element software ANSYS. It is found that it can not only reduce the weight of the structure and enhance the safety performance of the structure, but also reduce the stress generated in the structure. (5) the direct economic benefit, comprehensive social benefit and environmental benefit of CGTIC are analyzed. The results show that the application of CGTIC in practical construction is not only feasible, but also has remarkable benefits in many aspects.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528

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