Ordinary plaster is a kind of ancient building decoration material, which is mainly used for indoor wall protection, coating and decoration. It is one of the main materials used for indoor construction.
In ancient China, ordinary plaster was used for wall construction and decoration. In the Han Dynasty, ordinary plaster was generally mixed with black mud, mud, clay and other materials to make the ideal coating material of indoor walls. Through the Song Dynasty, ordinary plaster has been widely used in indoor decoration.
Ordinary plaster can also be mixed with various additives such as straw, straw ash, wheat flour and so on. In areas with superior natural conditions, lime soil can be used as the main raw material.
In the Han Dynasty, ancient people mainly used wood and wood ashes to make the necessary binding agent in ordinary plaster. In the Sui and Tang Dynasties, in order to improve the hardness of ordinary plaster, animal fat and egg white were added to ordinary plaster, and the components of ordinary plaster were continuously improved.
In the Ming and Qing Dynasties, in order to further reduce the cost and improve the strength of ordinary plaster, linseed oil, resin and animal glue were added. Nowadays, the main raw materials of ordinary plaster include lime soil, sand, gypsum and alkaline material.
Lime soil, which is the main raw material of ordinary plaster, is usually made from burning marl or other marl-like materials in a kiln and grinding them into powder. Sand, as the name suggests, is a kind of loose soil formed by grinding and smashing rocks in nature. Gypsum is a kind of intrinsically hydrated calcium sulfate mineral. Alkaline materials are mainly quicklime, and quicklime has a high moisture absorption rate and reacts with water easily.
When ordinary plaster is made, it is first necessary to mix all the components in proper proportions and then add a small amount of water. The amount of water added depends on the humidity and nature of different raw materials, and the better the moisture absorption capacity of raw materials, the less water added. After mixing, ordinary plaster is usually poured, then troweled or grouted. After the plaster is dried, it can be polished and painted.
Ordinary plaster has good flexibility and is not easy to crack. It is difficult to correct construction errors. Generally, the construction of ordinary plaster is of low cost and can be used for many times.
