Plastering Plaster is a gas hard leveling material prepared by using building gypsum and quartz sand as base materials, plus fillers and a variety of additives to improve plastering performance. It can be widely used in the leveling of indoor walls and ceilings of various buildings. Compared with traditional cement-based plaster, plaster plaster has the advantages of simple operation, early strength, fast hardness, strong bonding and good ease. The wall after construction is smooth and delicate, not hollow, and not easy to crack.
Although plastering plaster does not shrink and produce cracks like cement-based plastering, in actual application, plastering plaster occasionally has quality problems such as cracking, hollowing, low strength, powder loss, etc. Cracking of plaster plaster is mainly caused by shrinkage [1]. Shrinkage includes chemical shrinkage, dry shrinkage, cooling shrinkage, plastic shrinkage, etc. The most common cracking is caused by plastic shrinkage. Plastic shrinkage is mainly caused by the evaporation of moisture before condensation of plaster gypsum. Reducing the evaporation of moisture before condensation of plaster gypsum can reduce the plastic shrinkage of plaster gypsum, thereby reducing the risk of cracking of plaster gypsum [2]. Improving the crack resistance of plaster plaster is one of the effective means to improve the quality of plaster plaster and promote the healthy development of the plaster plaster industry.
Selecting appropriate raw materials and additives can not only improve the constructionability and mechanical properties of plaster plaster, but also solve the problems of powder loss, shedding, cracking and low strength of plaster plaster in special environment construction. There are many ways to reduce the risk of cracking by optimizing the ratio of plaster plaster. This paper mainly studies the phase composition of building gypsum, the ratio of gypsum to sand, and the amount of retarder .
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