Thermal Performance Calculations And Experimental Studies Of Hollow Glass Beads Reinforced Cement Matrix Composites Equivalent

With the development of society, the energy crisis is gradually increasing in recent years, China’s energy conservation and other relevant policies have also been vigorously promote, develop good seismic performance, low construction cost, low energy consumption, saving land building system is Today the building sector an important research topic. In this context, hollow glass beads of cement-based composites mechanics experiments and theoretical analysis has important significance.Hollow glass beads(Hollow Glass Microsphere, HGM) is a hollow sphere lightweight core material, not toxic, smooth surface, a very uniform dispersion and its advantages are the excellent flowability after filling, can resist the compressive strength comparison high value, thermal insulation and fire resistance, superior performance, energy efficiency for buildings and building fire safety aspect is very appropriate. And the physical and chemical properties of this material is relatively stable, good insulation properties. Has been in the aviation, aerospace, civil, mechanical, physical, chemical and other fields has important applications. With the upgrading of raising the level of scientific research and scientific equipment, hollow glass microspheres preparation technology has also been improved, so the application and scope of hollow glass microspheres are constantly expanded, from the early traditional simple filler era, now slowly developing into functional materials. The internal structure of hollow glass microspheres is rather special, it is a hollow internal structure, which formed a relatively large surface area, so the hollow glass microspheres can provide a relatively large contact surface and the reaction space is filled with the substrate.Glass beads light, with its cement after filling can be made into a very small density concrete material, this paper focuses on the beads(HGM) enhanced the formation of beads cement cement-based composite materials, beads of incorporation, microbeads wall thickness, thermal conductivity of cement changes, to study the thermal properties of the composite. In this paper, the thermal performance by creating HGM model represents voxels / cement composites for HGM filling cement composites formed using ABAQUS finite element numerical simulation of two-dimensional and three-dimensional analysis, thermal analysis from its composite micro level behavior; at the same time, the use of JW-3-type thermal conductivity detector to measure the thermal conductivity of the composite material content under different beads, from the macro-level analysis of the impact of hollow glass microspheres incorporation of the composite thermal insulation properties.This article from a combination of simulation and experimental point of view to establish a high-performance hollow glass microspheres cement-based composite microstructure evolution model to study the dependence of cement reinforced bead after bead macroscopic thermal performance and hollow structure. The main contents of this paper are:1、Macro thermal experiment: when beads were incorporated in an amount of 0%, 5%, 10%, 15%, 20%, 25%, 30%, these specimens JW-3 type thermal conductivity were measured Experiments on thermal analyzer, the macroscopic thermal experimentally derived data and finite element simulation analysis data were compared.2 、 Numerical simulation: the thermal theory ABAQUS simulation technology combined with microscopic, according to cement beads after incorporation, the characteristics of the formation of the microstructure of the composite material, with hollow glass beads in the center of the cement-based model establishment of a representative volume element is calculated. By finite element analysis, solving compute voxel temperature field, heat flux vector and so on. Equivalent thermal parameters resulting composites.