Plastering mortar is a kind of functional material rather than structural material. Its function is to level the wall surface and protect the wall. The quality of plastering mortar is reflected in its engineering quality. At present, the main problems of plastering mortar are cracking, hollowing and falling off. One of the main reasons is that the bonding strength of mortar is low, so the bonding strength is an important index for plastering mortar.

抹面砂漿除要求具有良好的和易性，容易抹成均勻平整的薄層，便于施工；還要求具有較高的粘結力，砂漿層要能與基底粘結牢固，長期使用不致開裂或脫落。好的抹灰砂漿對建筑物和墻體可起保護作用，它可以抵抗風、雨、雪等自然環境對建筑物的侵蝕，并提高建筑物的耐久性。經過砂漿抹面的墻面或其他構件的表面又可以達到平整、光潔和美觀的效果。

In addition to good workability, the plastering mortar is easy to be plastered into a uniform and flat thin layer, which is convenient for construction; it is also required to have a high cohesive force, and the mortar layer should be able to bond firmly with the base, and it will not crack or fall off after long-term use. Good plastering mortar can protect buildings and walls. It can resist the erosion of natural environment such as wind, rain and snow, and improve the durability of buildings. The surface of the wall or other components plastered with mortar can achieve smooth, smooth and beautiful effect.

抹面砂漿的稠度可根據基層材料決定。選用普通抹灰砂漿，應同時考慮其可操作性，包括砂漿的保水性、黏聚性和觸變性，以及初期抗裂性、粘結強度、抗壓強度和后期抗裂性等多重指標，不能只偏重某一指標而影響砂漿其他性能。

The consistency of plastering mortar can be determined according to the base material. When selecting common plastering mortar, its operability should be considered at the same time, including water retention, cohesiveness and thixotropy of mortar, and multiple indexes such as initial crack resistance, bond strength, compressive strength and later crack resistance. It is not allowed to focus on one index and affect other properties of mortar.

抹面砂漿的使用應根據建筑物的立面尺寸精度和墻體結構形式決定。例如，磚結構墻體因為塊體之間灰縫多，塊體尺寸偏差大，一般就采用普通抹灰砂漿；鋼筋混凝土結構，如果模板尺寸精度偏差大或混凝土墻板與梁斷面尺寸不一致，那么也必須作普通抹灰；如果鋼筋混凝土結構基層尺寸精度偏差小，那么就可采用薄層砂漿抹灰。

The use of plastering mortar should be determined according to the vertical dimension accuracy of the building and the structural form of the wall. For example, for brick structure wall, because there are many mortar joints between blocks and the block size deviation is large, ordinary plastering mortar is generally used; for reinforced concrete structure, if the accuracy deviation of formwork size is large or the size of concrete wall panel and beam section is inconsistent, then ordinary plastering must be carried out; if the dimensional accuracy deviation of reinforced concrete structure base is small, thin-layer mortar plastering can be used.