Wipe the surface very thick, use high-grade cement mortar, high strength, this is wrong.

面层抹得很厚，用上高标号水泥，高强度砂浆，这就错了。

youdao

To do so, he does not cause surface layer and cement mortar is inconsistent, surface water mud too much, easy to the problem of craze.

这样做，就不致造成表面与里层砂浆配合比不一致，表面水泥浆太多，易于开裂的问题。

youdao

And in the surface of the cement mortar, contains alkaline materials, therefore, embedding common glass cloth fabric, does little.

而在面层砂浆的水泥里，含有碱性材料，因此，埋入普通玻璃纤维网布，起不了什么作用。

youdao