Study On Preparation Of Basic Material For Exterior Wall Panels Of Low-Energy-Consumption Enclosure System And Simulation Study Of Thermal Performance

At present,energy consumption in the building sector accounts for 30%to 40%of the total energy consumption of the whole society around the world.Building energy conservation is increasingly important,and the building exterior wall in the building envelope is very important.With social development and national policy requirements,building energy efficiency standards have gradually increased.In order to meet the"Near Zero Energy Building Technical Standards"in severe cold areas,this paper develops a low-energy peripheral wall panel with excellent thermal insulation,durability,fire resistance and other advantages.Adopt the method of composite heat preservation of lightweight aggregate concrete.The following are the main research results and conclusions:(1)Carry out dry density,compressive strength,flexural strength,thermal conductivity,slump,freeze-thaw cycles,and anti-chloride ion penetration tests for different mix ratios of lightweight aggregate concrete(LAC)and foamed reactive powder concrete(ARPC).Comprehensive analysis to get the optimal mix ratio plan.The test results of LAC and ARPC are dry density 949.4kg/m~3and 1326.9kg/m~3,28d compressive strength 6.65MPa and 13.22MPa,28d flexural strength 3.45MPa and4.78MPa,thermal conductivity of 0.0610W/(m·K)and 0.070W/(m·K),the slump is140mm and 295mm.(2)After theoretical calculations and the fuzzy comprehensive evaluation method based on analytic hierarchy process,the best plan for the selection and thickness of the insulation layer of low-energy-consumption peripheral wall panels is determined,that is,the insulation materials choose 75mm-thick vacuum insulation panels,which are light The thickness on both sides of the aggregate concrete is 30mm.The calculated thermal resistance of the wallboard of this scheme is 10.509(m~2·K)/W,the heat transfer coefficient is 0.095W/(m~2·K),and the wallboard mass per unit area is86.964 kg.(3)The ABAQUS finite element simulation analysis was carried out on the wall panels of the three systems.The simulation value of the heat transfer coefficient of the concrete system wall panels(control group)was 0.172W/(m~2·K),and the simulation value of the heat transfer coefficient of the external wall panels of the reinforced system was 0.199W/(m~2·K),the simulated value of heat transfer coefficient of light steel frame system external wall panel is 0.193W/(m~2·K),which meets the thermal performance specification standard of near zero energy consumption wall panel.Light steel system is selected for trial production External wall panels.(4)The preparation methods and processes of concrete system wall panels(control group)and light steel system external wall panels were studied,and trial production was carried out.Foamed reactive powder concrete was used to partially replace lightweight aggregate concrete for the pouring of special parts of the wall panels.The error of the simulation value is less than 2%,and the feasibility of the low energy consumption peripheral wall panel is judged.