研究了分别以柠檬酸、柠檬酸与普通硅酸盐水泥复合物作缓凝剂,调节粉刷石膏的凝结时间,并对比2种缓凝体系对石膏抗折、抗压强度的影响.比较不同保水剂(聚乙烯醇、羧甲基纤维素)以及相同量的保水剂在不同工艺流程下保水效果上的区别.探索了有机保水剂和无机保水剂对粉刷石膏的保水性的影响.结果表明,柠檬酸与普通硅酸盐水泥的复合缓凝剂比单纯的柠檬酸更能有效地延缓建筑石膏的凝结,同时建筑石膏的抗折、抗压强度降低幅度减小.
The influence of retarder on the seaing time and ultimate strength of gypsum plaster was investigated in this paper.The experimental results indicate that the effect of single retarder,such as citric acid,is inferior to that of composite retarder which Was made of blending citric acid with a few Portland cement(about 0.5%,by weight).The effect of different water-retention agents,such as Polyvinyl alcohol(PVA),carboxymethyl cellulose (CMC),and Na-bentonite,etc.,Was also studied,and the results demonstrate that by means of adding organic and inorganic water-retention agent simultaneously the water-retention of plastering slurry can obviously be improved.The optimal mix proportion of gypsum plaster suitable to finish coat of walls and ceilings of buildings has been got by use of factorial experiment with orthogonal array accounting for interactions between factors each other.
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