轻质石膏砂浆作为粉刷石膏的一个新品种,主要用于墙面的找平层,同时对外墙内侧、分户墙及顶棚具有补充节能的作用。配制时宜选择表面玻化率高、密度小的玻化微珠作为轻骨料,其掺量为石膏量的20%～35%;当采用膨胀珍珠岩作为轻骨料时,其掺量为石膏量的15%～25%;纤维素醚掺量一般为石膏量的0.2%～0.4%;引气剂的掺量为粉料总量的0.6%～1.2%。按m(石膏)∶m(玻化微珠)∶m(纤维素醚)∶m(引气剂∶)m(SC缓凝剂)=770.0∶215.0∶4.1∶5.0∶2.3制备的轻质石膏砂浆导热系数为0.12 W/(m.K),通过计算,采用20 mm厚轻质石膏砂浆代替传统水泥砂浆,对200 mm厚混凝土隔墙进行双面抹灰后,保温效果提高38%。

As a new species of plaster,lightweight gypsum plaster is mainly used for wall leveling layer,meanwhile it has additional energy conservation effect when applied on the inside surface of external wall,party wall and ceiling.During preparation,glass beads with high surface vitrify rate and low density are selected as lightweight aggregate,and its dosage is 20%～35% of the gypsum amount;when expanded perlite is as lightweight aggregate,its dosage is 15%～25% of the gypsum amount;the dosage of cellulose ether is generally 0.2%～0.4% of the gypsum amount;the dosage of air-entraining agent(AEA) is 0.6%¹.2% of the total powder quantity.When m(gypsum)∶m(glass beads)∶m(cellulose ethers)∶m(AEA)∶m(SC retarder)=770.0∶215.0∶4.1∶5.0∶2.3,the prepared lightweight gypsum plaster has thermal conductivity of 0.12 W/(m·K).The calculation results show that the insulating effect will be increased by 38% if 20 mm-thick this type of plaster instead of the ordinary cement mortar is applied on both sides of the 200 mm-thick concrete wall.