Study On Preparation And Properties Of Wall Composite Insulation Materials

This paper mainly studied the mechanical properties, thermal properties and waterresistance of vitrified beads-polystyrene particles insulation mortar, prepared with vitrifiedbeads and polystyrene particles as light aggregate, cement and fly ash as cementitious material,polypropylene monofilament tensile fiber and redispersible latex powder as the crack resistanceand reinforcement material and mixed with other additives.The effects of polystyrene particles and additives on the performances of compositeinsulation mortar: With the increase of the content of polystyrene particles, dry density andcompressive strength of the composite thermal insulation mortar showed the same decreasingintention. The water absorption of the composite thermal insulation mortar increased and thesoftening coefficient decreased with the increasing of the content of the polystyrene particles.With the increase of the content of air-entraining agent, both the dry density and thecompressive strength of the composite thermal insulation mortar decreased, the waterabsorption and the softening coefficient both increased. And with the increase of the content ofhydrophobic agent, the dry density and the compressive strength both increased, the waterabsorption decreased and the softening coefficient increased. With the increase of the contentof the polypropylene monofilament fiber, the dry density and the compressive strengthincreased, the water absorption decreased and the softening coefficient increased. The range ofthe ratio of raw materials were abtained as: polystyrene particles2wt%-3wt%, hydrophobicagent0wt%-0.2wt%, air-entraining agent0.4wt%-0.8wt%and polypropylene monofilamentfiber0wt%-0.6wt%. The optimal solution was polystyrene particles3wt%, hydrophobic agent0.2wt%, air-entraining agent0.4wt%， polypropylene monofilament fiber0.6wt%. Theperformance of the thermal insulation mortar were of the dry density228Kg/m3,28daycompressive strength0.54MPa, thermal conductivity0.0596W/(m K).The effects of fly ash and aggregate on the performances of composite insulation mortar:With the increasing of the content of fly ash, dry density and the compressive strength of thecomposite thermal insulation mortar show the same decrease intention first, and then increased.When the content of fly ash increased from10wt%to15wt%, the water absorption increasedand then decreased, the softening coefficient decreased and then increased. When the weight ratio of water and material increased from0.9to1.3, the correspondence dry density increasedand then decreased, but the compressive strength decreased. The water absorption of thecomposite thermal insulation mortar increased with the increasing of the weight ratio of waterand material, whereas the softening coefficient decreased and then increased with theincreasing of the weight ratio of water and material. In the analysis of dry density, c was the bestway of incorporation of hydrophobic agent; in the analysis of compressive strength, b was thebest way of incorporation of hydrophobic agent. For1(24) h water absorption, b was a betterway of incorporation of hydrophobic agent; and for softening coefficient c was a better way ofincorporation of hydrophobic agent. With the increasing of the content of aggregate, the drydensity and the compressive strength of the composite thermal insulation mortar both decreased,the water absorption and softening coefficient of the thermal insulation mortar both increased.The range of the ratio of raw materials were abtained as: fly ash15wt%-20wt%, weight ratio ofwater1.1-1.3, way of incorporation of hydrophobic agent b(hydrophobic agent was added inthe ratio) and c(hydrophobic agent was sprayed on the surface of the thermal insulationmaterial) and aggregate35wt%-45wt%. The optimal solution was fly ash15wt%, aggregate40wt%, weight ratio of water and material1.1, hydrophobic agent0.2wt%(hydrophobic agentwas added in the mixture). The performances of the thermal insulation mortar were recorded asdry density220Kg/m3,28day compressive strength0.50MPa, thermal conductivity0.0593W/(m K).The effects of redispersible powder and cellulose ether on the performances of compositeinsulation mortar: With the increase of the content of redispersible powder, dry density of thecomposite thermal insulation mortar showed the increase intention first, and thendecreased，and compressive strength showed the decreasing intention. The water absorptionof the composite thermal insulation mortar increased, and the softening coefficient decreasedwith the increasing of the content of the redispersible powder. With the increase of the contentof cellulose ether, the dry density of the composite thermal insulation mortar showed thedecrease intention first and then increase, and the compressive strength showed the decreasingintention， the water absorption increased and then decreased, the softening coefficientdecreased and then increased. And with the increase of the content of lignocellulose, the drydensity and the compressive strength of the composite thermal insulation mortar both decreased, the water absorption increased and the softening coefficient decreased. The range of the ratio ofraw materials were abtained as: redispersible powder2wt%-4wt%, cellulose ether0.2wt%-0.4wt%, lignocellulose0.2wt%-0.3wt%. The optimal solution was redispersiblepowder4wt%, cellulose ether0.3wt%, lignocellulose0.3wt%. The performances of the thermalinsulation mortar were recorded as dry density224Kg/m3,28day compressive strength0.45MPa, thermal conductivity0.0594W/(m K).