Plastering mortar is a functional material rather than a structural material, and mainly plays the role of protecting the wall, in addition to leveling the wall. The quality of plastering mortar is ultimately reflected in its project quality. The main problems existing in plastering mortar are cracking, hollowing and shedding, for which a major reason is low bond strength of mortar. So for plastering mortar the bond strength is an important indicator. In addition to good workability, easiness of coating uniform, flat thin layers and convenience for construction, plastering mortar also requires to have higher bond force so that the mortar layer is able to be firmly bonded to the substrate, not leading to cracking or shedding for long-term use. Good plastering mortar can play a protective role in buildings and walls. It can resist the erosion of natural environment such as wind, rain and snow to buildings, and can improve the durability of buildings. The mortar-plastered wall or surface of other components can also achieve smooth, clean and beautiful effects.
The component materials of plastering mortar are basically the same as those of masonry mortar. However, in order to prevent cracking of mortar layer, sometimes there is a need to add some fibrous materials; sometimes, in order to make it have certain features, such as waterproofing or insulation and other functions, there is a need to select special aggregates or admixtures.