Performace Research And Design Of Integrated Energy Conservation And Heat Insulating Material

With increasing requirments of building energy saving,lightweight and high strength as well as the integration of heat insulation become the tendency of building material development.There are two kinds of heat insulation systems at present:external insulaiton system and self insulation system,external insulation system has advantages of decoration,heat insulation,water-proof,frost resistance and sound insulation and so on,but external insulation system has many different standards which lack of theoretical foundation,and there are still many defects in fireproof,insulation and strength;therefore,it seems important to develop self insulation system.Currently used self insulation materials in self insulation system have obtained great development,but lightwight aggregates and porous concrete is still lacking of systematic study.Therehence,on the one hand,this paper makes relative theoretical studies of external insulation and integrated panel,on the other hand,focuses on the lightwight aggregates and porous concrete in order to provide foundation for light weight and high strength as well as the integration of heat insulation of building material.Metallic decorative and insulation integrated panel includes three parts:metal face plate,thermal insulation panel and plate seams between panels,thickness of thermal insulation panel and heat bridge in the seams have great influences on the thermal performance of integrated panel,this paper get the formula by theoretical calculating which meet the minimum heat transferring requirments in different places:b?0.023R_o,min;this paper tests the effects of different joint sealant materials and metal hem on the insulation performance of integrated panel;by creating models through Solidworks,this paper simulated the deformation situation with different steel dimensions and thickness under boundary restriction and temperature changing situation by applying ANSYS,and obtained the best dimension 1200mm31200mm30.6mm.Air-entraining effects has great relationship with cement paste rheological characteristic,this paper tests the air-entraining effects of cement pastes with different proportion of fly ash,water reducer;fly ash proportion will influent the mortar viscosity,the mortar viscosity has the minimum value of 3.65 Pa·s with the fly ash proportion of 20%and same water reducer proportion;the mortar has the minimum value of 4.25 Pa·s with water reducer proportion of 2.1%and same fly ash proportion,and the wet density gets the minimum value of 2004kg/m³.The performance of lightweight aggregate microporous concrete has a great relationship with the stirring time.When the mixing time is 3min,the wet density of concrete is the lowest.When adjusting the amount of water reducer to control the fluidity of concrete in the range of400⁵50mm,it is beneficial to obtain the stable air entraining agent's air entraining effect,so as to reduce the wet density and thermal conductivity of concrete.In this paper,the orthogonal test method is applied to study the influence of water/binder ratio,air entraining agent dosage and sand ratio on the performance of lightweight aggregate porous concrete,and the mixture ratio of lightweight aggregate concrete with a density class of 1550 kg/m³,a 28d compressive strength of 39MPa,a thermal conductivity of 0.280W/?m·K?)and a 56d drying shrinkage of 620310^-6 is obtained through optimizing the mixture ratio through experimental results.Based on the optimized mix proportion,this paper tests the effects of light weight aggregates with different density level and additional water adding order on concrete performances,which indicates that the light weight aggregates of 700 level,pre-wet and dry to saturated surface dry situation can improve the performances of concrete,mercury porosimeter method is applied to test the distribution of pores in the concrete,and the relationship between pore distribution and various performances is analyzed.