Research Of Inorganic Crack-resistence Insulation Mortar

About 30 percent energy of the total energy is consumed by buildings .Along with the increasing demands of energy saving, people becomes to pay more attention to building energy conservation. The insulation material markets are flourishing for these reasons. However , lots of high-rise fire in recent years have exposed the defections of organic insulation materials. So it is necessary to research and develop inorganic insulation materials.In the experiments, expanded and vitrified beads were selected as lightweight aggregates. Raw materials'effects (except cement) on the properties of inorganic insulation mortar and their proper content were investigated in this paper. The raw materials include expanded and vitrified beads, fly ash, calcium carbonate, celite , redispersible powder, cellulose ether and polypropylene fiber. The insulation mecha -nism of inorganic insulation mortar, crack-resistence mechanism of fiber and the effects of additive were also investigated in this paper.Experimental result as follows: the increasing content of expanded and vitrified beads can decrease dry bulk density, strength , softening coefficient, thermal conduc -tivity and linear shrinkage of inorganic insulation mortar. As the content of fly ash was increasing to 15 percent , dry bulk density, strength , softening coefficient and linear shrinkage were gradually reduced. The content of calcium carbonate's increasing can increase the dry bulk density , compress strength and flexural strength , but to reduced the tensile bonding strength and linear shrinkage. As the increasing amount of celite , the dry bulk density, compress strength, flexural strength and softening cofficient were increased, but it can decline the tensile bonding strength and linear shrinkage. As for redispersible powder, the increasing amount can raise the tensile bonding strength and softening coefficient. Cellulose ether's increasing can also improve the tensile bonding strength, but to reduce the compress strength, flexural strength and linear shrinkage, The polypropylene fiber can visibility decline the compression break ratio of inorganic insulation mortar.Through the experiments, the reasonable proportion of inorganic insulation mortar is that the amount of expanded and vitrified beads is 50 percent, cement is 29.9 percent , fly ash is 10 percent , calcium carbonate is 4.0 percent , celite is 4.0 percent , redispersible powder is 1.0 percent , cellulose ether is 0.6 percent and polypropylene fiber is 0.5 percent . The properties of this type inorganic insulation mortar is that the dry bulk density is 298.6kg/m3, thermal conductivity is 0.060W/(m·K), linear shrinkage is 0.09 percent , compress strength is 0.40MPa, tensile bonding strength is 0.12MPa and softening coefficient is 0.62. This result is totally meet the request of JG/T 283-2010.The connection between dry bulk density and thermal conductivity were also investigated, it following the formular 0λ=0 .0034+1.8374×10-4ρ, the related coefficient is 0.9266.