抹面砂浆底层主要起以下作用：
　　The plastering mortar base mainly serves the following functions:
　　一、粘结作用
　　1、 Adhesive effect
　　底层砂浆的主要功能是确保砂浆与基层之间能够牢固地粘结。这种粘结作用是抹面砂浆系统的关键，因为它能够防止砂浆层与基层之间的分离，从而确保整个砂浆系统的稳定性和耐久性。底层砂浆通常具有良好的保水性，这有助于它与基层之间形成紧密的粘结。
　　The main function of the bottom mortar is to ensure a strong bond between the mortar and the base layer. This bonding effect is crucial for the plastering mortar system, as it prevents separation between the mortar layer and the base layer, ensuring the stability and durability of the entire mortar system. The bottom mortar usually has good water retention, which helps it form a tight bond with the base layer.
　　二、防水防潮（特定情况）
　　2、 Waterproof and moisture-proof (specific situation)
　　在需要防水或防潮的场合，底层砂浆可能会选择使用水泥砂浆，因为水泥砂浆相较于其他类型的砂浆具有更好的防水性能。这有助于防止水分渗透到墙体内部，从而保护墙体的结构和性能。
　　In situations where waterproofing or moisture resistance is required, cement mortar may be chosen as the base mortar because it has better waterproof performance compared to other types of mortar. This helps prevent moisture from seeping into the interior of the wall, thereby protecting the structure and performance of the wall.
　　三、适应基层特性
　　3、 Adapt to grassroots characteristics
　　底层砂浆的选择还会根据基层材料的特性和工程部位的不同而有所差异。例如，对于砖墙底层抹灰，可能会选择使用石灰砂浆；而对于板条墙或板条顶棚的底层抹灰，则可能会选择使用混合砂浆或石灰砂浆。这种选择是为了确保底层砂浆能够与基层材料形成良好的粘结，并适应不同的施工环境和要求。
　　The selection of bottom mortar will also vary depending on the characteristics of the base material and the different parts of the project. For example, for plastering the bottom layer of brick walls, lime mortar may be chosen; For the bottom plastering of Flat noodles walls or Flat noodles ceilings, mixed mortar or lime mortar may be used. This choice is to ensure that the bottom mortar can form a good bond with the base material and adapt to different construction environments and requirements.
　　综上所述，抹面砂浆底层在抹面砂浆系统中扮演着至关重要的角色，它不仅起到了粘结基层的作用，还根据具体需求提供了防水防潮等额外功能，并适应了不同基层材料和施工环境的要求。
　　In summary, the bottom layer of the plastering mortar plays a crucial role in the plastering mortar system. It not only serves as a bonding agent for the base layer, but also provides additional functions such as waterproofing and moisture resistance according to specific needs, and adapts to the requirements of different base materials and construction environments.
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