Plastering mortar common quality problems and treatment methods
1) Empty drum: the main reasons are:
① Unclean grass-roots treatment. Such as dust and loose material attached to the surface of the grass-roots level, mold release agent and oil stains. These sundries are not thoroughly removed will affect the bond between the plaster layer and the grass-roots level.
② There is a concave or a plaster too thick, etc., in the mortar before drying mortar layer has been detached from the grass-roots level due to gravity.
③ Improper interface treatment or no interface treatment, the base surface is too smooth. The drying contraction of mortar cannot be suppressed, resulting in the detachment of the mortar layer from the grassroots. Before plastering, the grass-roots level should be swept clean and water should be poured onto the wall surface starting 2-3 days in advance. The construction can be carried out only after the depth of water penetration reaches 10 millimeters. Where there is deep concavity, the mortar should be made up in advance. In addition, the interface mortar should be sprayed in advance.
Mainly due to the underlying gray layer is too dry. Prevention and control methods in addition to construction according to the specification requirements. If you find the bottom layer has been dry, should be water wet, to be wet through the bottom layer and then wipe the surface layer.
3) Burst gray:
the main reason is that the material quality is not good, there are impurities or soil. Construction should be carefully checked before the quality of materials, sand should be sifted through a fine sieve before use.
The main reason is that the plaster layer is too thick without taking anti-cracking measures or cracking due to hollow drums. If the plaster surface is very thick, the construction should first fill the bottom layer, or spray anti-cracking agent to deal with it after the bottom layer is plastered.
Cement plaster mortar appeared above. It should be reworked and repaired, and when it is repaired, the delamination, hollow drum, bursting ash and cracks are partially removed, and then localized plastering is carried out according to the specification requirements.