Heat transfer mechanism and microstructure analysis of rubber-recycled aggregate insulated concrete
Rubber insulated concrete(IRC)was prepared by using rubber particles(RP)and recycled aggregate(RA)as insulating lightweight aggregate and adding nano-silica(NS)as auxiliary cementitious material.The thermal conductivity and heat transfer mechanism of IRC were investigated through environmental simulation tests under natural and simulated light,and combined with the indexes of material density,water absorption,thermal conductivity,and microscopic pore structure.The results showed that the addition of RP introduced a large number of pores,and the density,water absorption and pore volume gradually increased,forming a por-ous structure and improving the thermal insulation performance of IRC.When the RP content is 20％,the ther-mal conductivity of concrete is 1.01 W/(m·K).The addition of NS optimized the microporous structure of IRC,refined the pore size,and disrupted the connected heat flow channels,which further improved the thermal insulation performance of IRC.The thermal conductivity is further reduced by 7.8％-9.4％with 3％NS.
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