Mortars applied to the surface of buildings or building components are collectively referred to as plasters. According to the different functions of the plastering mortar, the plastering mortar can be divided into ordinary plastering mortar, decorative sand and plastering mortar with certain special functions (such as waterproof mortar, thermal insulation mortar, sound absorbing mortar and acid resistant mortar). It is required to have a good workability for plastering mortar, and it is easy to be smeared into a uniform flat layer for construction. It should also have a high bonding force, and the mortar layer should be able to bond firmly to the bottom surface without cracking or falling off for a long time. In areas that are wet or susceptible to external forces (such as floors and wall skirts), they should also have high water resistance and strength.
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