A, aerated block wall plastering practice
1, cleaning the base, you can use 10% caustic soda water to remove oil stains on the concrete surface, then dry it, and throw a layer of1:1gruel cement fine mortar with a broom to make it solidify on a smooth base surface, and it is better to break it off by hand.
2. Before plastering, nail 55mm steel wire mesh, and then tie it tightly. For concrete frame columns, steel wire mesh is fixed on wall mats, windowsill beams and cement.
3. Before plastering, put the casing through the hole in the wall in time, and then fill it with 1: 3 cement mortar. Plastering the wall behind radiators and dense pipes, preferably before radiators and pipes, the plastering surface will be relatively flat.
4, check the doors and windows before rendering, and determine the plastering parts of the handover parts of doors and windows.
5, in the door and window squabble, outer corner, decorative column corner, vertical hanging on the wall, and according to the ash cake reinforcement, pop-up plastering layer control line on the wall.
6, in the awning, balcony, windowsill, coping and other parts, to do a good job of water slope, the following to do drip line, water slope and drip line from the outer surface should not be less than 40mm, drip line should ensure that the slope direction is correct. .
7, mixed with a certain amount of cement slurry, followed by 1: 3 cement mortar, each time the thickness is 5 ~ 7 mm, layered reinforcement, leveling with a big bar, straightening, leveling with a wooden trowel.
8. After the bottom mortar is plastered, the surface mortar can be plastered the next day. The mixing ratio of surface mortar is1:2,5 cement mortar, and the thickness is 5 ~ 8 mm, then the grid strips are pulled out, and after the ash layer is dry, the joints are marked with plain cement slurry. For the pole that is difficult to lift, it should not be too hard to prevent the edges and corners from being damaged. Should be repaired after each layer is dry, and the joint should be repaired.
9. Maintenance: cement mortar plastering layer is sprayed with water.
Second, the performance reasons of aerated concrete block
1, the shrinkage is large, and the shrinkage before 28 days is not only large, but also better.
2, dry aerated concrete masonry is easy to absorb the moisture in the plastering layer, thus affecting the mortar strength and wall adhesion.
3. If the moisture content of the wall is insufficient, the moisture in the newly plastered mortar layer will be continuously absorbed by the aerated concrete block, resulting in the decrease of mortar strength and cohesive force, and the plastered layer will be hollowed out, pulverized and peeled.
4. The rapid evaporation of water on the surface of aerated concrete masonry will cause unsynchronized evaporation of water on the masonry and plastering surface, resulting in large shrinkage deformation, which will lead to shrinkage, cracking and hollowing of plastering layer.
5. If the surface is fish-scale and loose particles appear, it should be cleaned before plastering, and an isolation layer will be formed between masonry and plastering, resulting in empty drum due to the decrease of cohesive force.
6. Under the condition of temperature and humidity change, the shrinkage stress difference between them leads to empty drum.
7. If the strength of plastering mortar is high, the shrinkage capacity of masonry mortar will be insufficient and lead to empty drum.
8. If there are few mortar joints on the wall surface, the embedding force of the wall to the plastering layer is insufficient, which is easy to cause the plastering surface to be empty.
The plastering method of aerated block wall is as above. It is suggested that plastering should be done by a professional cement master, so as to show the best effect. The performance of aerated concrete block is due to the above reasons. Whatever the reason, its performance is good. If it is necessary to use them in interior decoration, they can be used to improve them.