Preparation Of Lightweight Aggregate Concrete Composite Insulation Of External Panel And Research Of Performance

In recent years, with the rapid development of city building, the proportion of building energy consumption in the total world energy consumption is growing up rapidly, not only seriously pollutes the environment, but also restricts the sustainable development of all countries in the world. In order to solve the energy crisis and meet the demand of the development of urban construction, we must develop and popularize the green wall materials. Currently, the representative of new wall products are mainly composite wall, which can maximize the complete industrial production and scientific management, to realize energy conservation in building, promote the process of housing industrialization. Currently the further development of building energy saving technology has restricted as a result of the heavy panel. This paper will modify cinder lightweight aggregate concrete by pp fiber, polymer and foam agent and apply it to composite panel technique. The weight of the panel is greatly reduced while all aspects of performance are satisfied, effectively promote the development of the technology. Specific work content is as follows:(1) According to the current national specifications and local standards, the calculation model of the cinder lightweight aggregate concrete composite insulation of external panel is established, the thickness of EPS thermal insulation material is calculated, and the energy conservation in building achieves 65%. By the simulation calculation of finite element analysis software and related mechanical calculation, which certifies the theoretic feasibility of the structure design of the cinder lightweight aggregate concrete composite insulation of external panel.(2) In this paper, it is studied the impact of fiber, polymer and foam agent on cinder lightweight aggregate concrete. The compressive strength and flexural strength are improved, the water absorption is reduced with the change in the pp fiber, polymer and foam agent content. The compressive strength and flexural strength of cinder lightweight aggregate concrete are improved by mixing plant straw fiber. The coefficient of thermal conductivity can be reduced and the thermal performance can be improved by mixing foam agent.(3) Effects of partial substitution and entire substitution of cinder with construction waste red brick are investigated. Partial substitution or entire substitution of cinder with red brick can improve the basic mechanical properties and water absorption of concrete, reduce the permeability resistance and frost resistance of concrete performance.(4) Researching the effects of pp fiber, polymer and foam agent on the basic mechanical properties and water absorption of cinder lightweight aggregate concrete through orthogonal experiment design and range analysis. The performance of cinder lightweight aggregate concrete is best with the pp fiber content is 1.5 ‰, polymer content is 10% and foam agent content is 0.1 ‰, which determine the optimal mixing proportion of cinder lightweight aggregate concrete.(5) Using the optimal mixing proportion of cinder lightweight aggregate concrete and the basic of cinder lightweight aggregate concrete to make contrast test for the permeability resistance and frost resistance performances of cinder lightweight aggregate concrete, founding that the permeability resistance and frost resistance of the modified cinder lightweight aggregate concrete has been greatly improved.(6) Using SEM study the microstructure of modified cinder lightweight aggregate concrete, the results showed that pp fiber, polymer and foam agent can significantly improve the interface transition zone structure of cinder lightweight aggregate concrete.(7) Testing the properties of the cinder lightweight aggregate concrete composite insulation of external panel with the optimal mixing proportion according to the relevant national standard. The results showed that the physical mechanical properties and thermal performance of the panel are all qualification and can be applied to practical engineering.