"If the unevenness is relatively minor, you can directly use cement mortar to smooth the uneven locations. But if there are many uneven locations and the situation is serious, you need to use mortar or fine stone concrete to level the original concrete surface. The layer can be effectively leveled, but because it is a secondary pouring, it cannot be too thin, otherwise the shelling and delamination may occur. "
1. Machine grinding and gypsum leveling
Specific method: Use the floor grinder to replace the iron grinding disc to grind the ground flat, and then use gypsum to level it.
Advantage:
1. It does not raise the ground level; it can be used for local leveling, and the leveling thickness is about 5-20mm.
2. It dries quickly; you can walk on it 2 hours after construction, and you can lay wooden floors in 3 days.
3. Relatively cheap and easy to construct.
2. Cement mortar leveling
Specific method: Re-pouring the concrete and leveling it. When leveling, pay attention to the fact that incorrect proportion of cement mortar will cause the surface layer to become powdery, sandy and cracked.
Advantages: Suitable for all kinds of floors; suitable for any ground and floor leveling before floor laying.
shortcoming:
1. The leveling thickness is too thick, between 25 and 35 mm, and the ground should be raised by at least 2 cm.
2. The construction is difficult; hollowing will occur if the leveling is not careful.
3. The drying speed is slow; it takes 3 days after construction to step on it, and it takes at least 15 days before the wooden floor can be laid.