玻璃微珠增强水泥基复合材料等效导热性能研究

发布时间：2018-07-07 11:28

本文选题：空心玻璃微珠 + 水泥基　；参考：《河南工业大学》2015年硕士论文

【摘要】：随着社会的发展,能源危机正在逐步增加,近年来中国的节能减排等相关政策也进行了大力宣传,研发出抗震性能好、造价成本低、建筑能耗低、节约土地的建筑体系,是当今建筑领域重要的研究课题。在这样的背景下,对中空玻璃微珠水泥基复合材料进行热学实验和理论分析研究具有重要的意义[1]。空心玻璃微珠(Hollow Glass Microsphere,HGM)是一种空心球轻质芯材,具有无毒性、表面光滑、填充后分散非常均匀以及流动性好等优点,抗压强度相对而言也比较高,保温隔热性和耐火性能优越,用于建筑节能和建筑防火方面是非常的合适的。并且这种材料物理化学性能比较稳定,隔声性能好。已在航空、航天、土木、机械、物理、化学等领域得到了重要应用[2]。随着科研水平的提高和科研设备的更新换代,空心玻璃微珠的制备技术也不断的提高,因此空心玻璃微珠的应用领域和范围也在不断的扩展,从早期传统的简单填充材料时代,现在则慢慢发展为功能性的材料。空心玻璃微珠的内部结构比较特殊,它是一种内部空心的结构,这种结构就形成了比较大的比表面积,因此空心玻璃微珠可以为填充基体时提供比较大的接触面和反应空间。玻璃微珠质轻,用其填充水泥后,能制作成容重非常小的混凝土材料,本文重点研究了微珠(HGM)增强水泥形成微珠水泥基复合材料后,研究微珠的掺入量、微珠壁厚、水泥导热系数的变化,对玻璃微珠水泥基复合材料的导热性能的影响。本文通过创建HGM/水泥复合材料的代表体元的模型,对HGM填充水泥形成的复合材料的导热性能用ABAQUS进行了二维的有限元数值仿真分析,从复合材料微观层面上分析其热学行为;同时,利用JW—3型导热系数测定仪来测定不同微珠掺量下的复合材料导热系数,从宏观层面上分析了空心玻璃微珠掺入量对复合材料保温隔热性能的影响。本文将从仿真和实验相结合的角度建立高性能空心玻璃微珠水泥基复合材料细观结构演化模型,研究微珠增强水泥后宏观的热性能与微珠空心结构的依赖关系。本文研究的主要内容有:1、宏观热学实验:当微珠掺入量分别为0%、5%、10%、15%、20%、25%、30%时,将这些试件分别在JW—3型导热系数测定仪上进行热学实验,将宏观热学实验得出的数据与有限元仿真分析的数据进行对比。2、仿真数值模拟:将ABAQUS仿真技术与细观的热学理论相结合,水泥中掺入微珠后,形成的复合材料的微观结构特点,以空心玻璃微珠位于水泥基的中心为模型,建立具有代表性的计算体元。通过有限元分析,求解计算体元的温度场、热流矢量等。从而得到复合材料的等效导热参数[3]。
[Abstract]:With the development of society, the energy crisis is gradually increasing. In recent years, China's energy saving and emission reduction policies have been vigorously publicized, and a building system with good seismic performance, low cost, low building energy consumption and land saving has been developed. It is an important research topic in the field of architecture nowadays. In this context, thermal experiments and theoretical analysis of hollow glass bead cement matrix composites are of great significance. Hollow Glass Microsphere HGM (HGM) is a kind of hollow sphere lightweight core material, which has the advantages of non-toxicity, smooth surface, uniform dispersion after filling and good fluidity. The compressive strength is relatively high, and the thermal insulation and fire resistance are superior. It is very suitable for building energy saving and building fire protection. And the physical and chemical properties of this material are stable and sound insulation is good. It has been widely used in aeronautics, aerospace, civil engineering, mechanics, physics, chemistry and so on. With the improvement of scientific research level and the replacement of scientific research equipment, the preparation technology of hollow glass bead has been continuously improved. Therefore, the application field and scope of hollow glass microspheres have been continuously expanded from the early era of simple filling materials. Now it is slowly developing into functional materials. The inner structure of hollow glass beads is very special. It is a kind of inner hollow structure, which forms a relatively large specific surface area. Therefore, hollow glass beads can provide a relatively large contact surface and reaction space for filling the matrix. Glass beads are light in weight and can be made into concrete materials with very small bulk density by filling them with cement. This paper focuses on the study of the content of microbeads and the thickness of microbeads after HGM reinforced cement is formed into microbead cement matrix composites. The influence of the change of thermal conductivity of cement on the thermal conductivity of glass microbead cement matrix composites. In this paper, the thermal conductivity of HGM / cement composite is analyzed by using Abaqus, and the thermal behavior of HGM / cement composite is analyzed from the microcosmic level by creating the model of representative volume element of HGM / cement composite. At the same time, the thermal conductivity of composites with different content of microbeads was measured by JW-3 thermal conductivity tester. The influence of the content of hollow glass beads on the thermal insulation properties of composites was analyzed from the macro level. In this paper, the microstructural evolution model of high performance hollow glass microbead cement matrix composites is established from the point of view of simulation and experiment, and the dependence of macroscopical thermal properties of microbead reinforced cement on microbead hollow structure is studied. The main contents of this paper are: 1, macroscopical thermal experiments: when the amount of microbeads added is 0, 10, 15, 20, 25, and 30, respectively, these specimens are carried out thermal experiments on the JW-3 thermal conductivity meter. Comparing the data obtained from macroscopic thermal experiment with the data of finite element simulation analysis. 2. Simulation numerical simulation: combining Abaqus simulation technology with meso-thermal theory, the microstructure characteristics of composite formed by mixing microbeads in cement, Based on the model of hollow glass beads located at the center of cement base, a representative computational volume element is established. Through finite element analysis, the temperature field, heat flux vector and so on are solved. Thus, the equivalent thermal conductivity parameters of the composites [3] are obtained.
【学位授予单位】：河南工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528

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