發(fā)布時間：2018-07-07 11:28

  本文選題：空心玻璃微珠 + 水泥基��； 參考：《河南工業(yè)大學》2015年碩士論文

【摘要】：隨著社會的發(fā)展,能源危機正在逐步增加,近年來中國的節(jié)能減排等相關政策也進行了大力宣傳,研發(fā)出抗震性能好、造價成本低、建筑能耗低、節(jié)約土地的建筑體系,是當今建筑領域重要的研究課題。在這樣的背景下,對中空玻璃微珠水泥基復合材料進行熱學實驗和理論分析研究具有重要的意義[1]�？招牟Ａ⒅�(Hollow Glass Microsphere,HGM)是一種空心球輕質(zhì)芯材,具有無毒性、表面光滑、填充后分散非常均勻以及流動性好等優(yōu)點,抗壓強度相對而言也比較高,保溫隔熱性和耐火性能優(yōu)越,用于建筑節(jié)能和建筑防火方面是非常的合適的。并且這種材料物理化學性能比較穩(wěn)定,隔聲性能好。已在航空、航天、土木、機械、物理、化學等領域得到了重要應用[2]。隨著科研水平的提高和科研設備的更新?lián)Q代,空心玻璃微珠的制備技術也不斷的提高,因此空心玻璃微珠的應用領域和范圍也在不斷的擴展,從早期傳統(tǒng)的簡單填充材料時代,現(xiàn)在則慢慢發(fā)展為功能性的材料�？招牟Ａ⒅榈膬�(nèi)部結構比較特殊,它是一種內(nèi)部空心的結構,這種結構就形成了比較大的比表面積,因此空心玻璃微珠可以為填充基體時提供比較大的接觸面和反應空間。玻璃微珠質(zhì)輕,用其填充水泥后,能制作成容重非常小的混凝土材料,本文重點研究了微珠(HGM)增強水泥形成微珠水泥基復合材料后,研究微珠的摻入量、微珠壁厚、水泥導熱系數(shù)的變化,對玻璃微珠水泥基復合材料的導熱性能的影響。本文通過創(chuàng)建HGM/水泥復合材料的代表體元的模型,對HGM填充水泥形成的復合材料的導熱性能用ABAQUS進行了二維的有限元數(shù)值仿真分析,從復合材料微觀層面上分析其熱學行為;同時,利用JW—3型導熱系數(shù)測定儀來測定不同微珠摻量下的復合材料導熱系數(shù),從宏觀層面上分析了空心玻璃微珠摻入量對復合材料保溫隔熱性能的影響。本文將從仿真和實驗相結合的角度建立高性能空心玻璃微珠水泥基復合材料細觀結構演化模型,研究微珠增強水泥后宏觀的熱性能與微珠空心結構的依賴關系。本文研究的主要內(nèi)容有:1、宏觀熱學實驗:當微珠摻入量分別為0%、5%、10%、15%、20%、25%、30%時,將這些試件分別在JW—3型導熱系數(shù)測定儀上進行熱學實驗,將宏觀熱學實驗得出的數(shù)據(jù)與有限元仿真分析的數(shù)據(jù)進行對比。2、仿真數(shù)值模擬:將ABAQUS仿真技術與細觀的熱學理論相結合,水泥中摻入微珠后,形成的復合材料的微觀結構特點,以空心玻璃微珠位于水泥基的中心為模型,建立具有代表性的計算體元。通過有限元分析,求解計算體元的溫度場、熱流矢量等。從而得到復合材料的等效導熱參數(shù)[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.
【學位授予單位】：河南工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU528

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本文編號：2104826