不同轻质骨料类型对复合保温材料性能的影响

Effect of Different Kinds of Lightweight Aggregates on Performance of Composite Insulation Materials

采用无机胶凝材料,分别以普通膨胀聚苯乙烯(EPS)颗粒、表面处理过的EPS颗粒、阻燃型EPS颗粒、表面处理过的EPS颗粒与空心微珠复配作为轻质骨料制备了复合保温材料,研究了不同轻质骨料类型对复合保温材料性能的影响.结果表明:与掺普通EPS颗粒的复合保温材料(基准组)相比,采用表面处理过的EPS颗粒制备的复合保温材料抗拉强度和抗压强度分别提高了57%和31%,导热系数有微小降低,热释放速率峰值(pHRR)减小了41.9%;复配轻质骨料中空心微珠体积分数为30%时,复合保温材料的性能可以满足标准要求,与基准组相比,其pHRR最高降低85.9%,总热释放(THR)为0.7MJ/m^2,已达到A1级不燃材料标准.

Composite insulation materials were prepared with inorganic cementitious materials and different kinds of lightweight aggregates, i.e. normal expanded polystyrene（EPS） particles, surface treated EPS particles, flame retarded EPS particles, surface treated EPS particles and cenospheres mixture. Effect of different lightweight aggregates on performance of composite insulation materials was investigated. Re- sults show that tensile strength and compressive strength of composite insulation materials are enhanced by 57% and 31% respectively after EPS particles are surface treated, and thermal conductivity of composite insulation materials is reduced slightly. Peak heat release rate（pHRR） is decreased by 41.9% compared with the composite insulation materials with normal EPS particles as lightweight aggregates（control sam- ple）. Performance of composite insulation materials can meet the standard requirements with cenospheres volume fraction of 30% in lightweight aggregates. For composite insulation materials with this mixed lightweight aggregates, flame retardancy is increased significantly, pHRR is decreased by 85.9 % compared with the control sample and total heat release（THR） is 0.7 MJ/m2 , which has reached class A1 non-com- bustible material standard.