| In our industry areas, wall material possesses the greatest potential in both energysaving and comprehensive utilization of resources, since it is the most versatile of buildingmaterials. At present, the common wall material inland can no longer satisfy our needs forits single property. With people’s increasing demands for architectural features and energysaving, basic functions of wall material have increased to thermal insulation, soundinsulation,anti-seismic and inflaming retarding as well as partition. Therefore, it isnecessary to push the research of new thermal insulation wall material. Currently, morethan90%of the buildings use polystyrene board exterior wall thermal insulation system，however, the system has a serious problem in safety hazard of durability and fireprevention.Aims to design the functional light wall materials of different functional requirements,achieving multi-functional compound on lightweight, high strength, thermal insulation, fireprotection, noise reduction. The research is mainly focused on the basis and aggregate.Firstly the research is focused on the basic features of foamed concrete matrix. Bycombining different fly, supplementary cementitious materials, water cement ratios,porosities, bubble volumes in strength and thermal conductivity,we can find the mostapplicable mix proportion. Namely that the appropriate of water cement ratios is0.28. Andthe supplementary cementitious materials B with optimum mix amount is15%, thesupplementary cementitious materials D with optimum mix amount is3%. Besides, watercement ratios, porosities, dry density has obvious exponential function with strength andthermal conductivity. The porosities is the most cement of dry density and thermalconductivity. Finally the limitation has been found by analysis the Pore structure by threenew technique which called x-CT, mercury porosimetric method and density method.Through the research of single-doped foam, single-doped air-entraining agent and complexmixed, we find the relationship of porosities, density, strength and the sound absorptioncoefficient. To keep small and uniformity is the most important method. Based on the requirement of lightweight and high strength, a new technique ofbaking-free light aggregate has focused on. Through the influencing factors of activator,binder, cementitious materials, the shell thickness and curing way, we found the mostapplicable mix proportion with the adaptive cementitious materials. Namely thatC:FA:B:D=1:0.85:0.15:0.03and the dilution rate of A is10%~15%. The curing regime andshell thickness is based on different functional requirements.Through the influencing factors of porosities, size and gradation design, the techniqueof composite wall materials and insulation structure materials was preliminarily studied. Ifit used as structural members, the bubble volumes with optimum mix amount is15%. If itused as sound absorption materials, in order to ensure sound absorption coefficient, thebubble volumes with optimum mix amount is more than30%. If it used as wall materials,the bubble volumes require to add to45%to make sure that the strength is more than15MPa. By theoretical analysis and calculation,the heat transfer coefficient is0.866W/m2·Kwhich is less than1.3W/m2·K in National Standards. It can be used as self thermalinsulation materials. |
