During the construction of the wall, plastering and cracking of the wall are very common. If you do not pay attention to the quality control of the process, the vacancy will be filled and the hole will be filled later, and the cost will rise rapidly. The following introduces the wall plastering method of the aerated block and the performance reasons of the aerated concrete block.
Aerated block wall plastering method
1. Clean the base layer, you can use 10% caustic soda to remove the oil on the concrete surface, and then dry it. Use a broom to throw a layer of 1: 1 gruel-like cement fine mortar to make it solidify on the smooth base surface. It's better to stop by hand.
2. Before plastering, lay nails of 5 × 5mm steel wire mesh, and then tighten tightly. For the concrete holding frame column, window sill beam, and wall pad, the steel wire mesh is fixed with cement.
3. Before plastering, put the pipe through the wall hole and place the casing in time, and then use 1: 3 cement mortar to embed the dense, plastering the wall behind the radiator and dense pipeline, etc., preferably before the radiator and the pipeline. The plastered surface is smooth.
4. Check the doors and windows before plastering, and determine the plastering parts at the junction with the doors and windows.
5. At the outer wall corner, door and window corner, decorative column corner, wall surface, etc., hang vertically, and after filling with the gray cake, the control line of the plastering gray layer will pop up on the wall surface.
6. In windowsills, awnings, balconies, roof tops, etc., the slope of the water flow should be done, and the drip line should be made below. The slope of the water flow and the drip line should not be less than 40mm from the outer surface. The drip line should ensure that the slope is correct. .
7. Mix a certain amount of cement mortar, followed by wiping 1: 3 cement mortar, each time with a thickness of 5 ~ 7mm, layered and smoothed with the reinforcement, and smoothed and straightened with a large bar, wood trowel rubbing.
8. After the bottom mortar is wiped, the surface layer mortar can be wiped the next day. The surface layer mortar mix ratio is 1: 2.5 cement mortar and the thickness is 5-8mm. Afterwards, the grids were pulled out, and after the ash layer was dried, the seam was hooked up with plain cement paste. For hard-to-be-divided grids, it should not be hardened to prevent damage to the edges and corners, and should be replenished after the layer is dry and the seam should be repaired.
9. Curing: water spray curing of cement mortar plastering layer.
Performance reasons of aerated concrete blocks
1. The contraction is large. For the contraction before the age of 28d, it not only has a large value, but also develops rapidly.
2. The dry aerated concrete masonry can easily absorb the water in the plaster layer, which will affect the strength of the mortar and the adhesion of the wall surface.
3. If the water content of the wall is insufficient, the water in the new mortar layer will be continuously absorbed by the aerated concrete blocks, causing the strength and adhesion of the mortar to decrease, and the plaster layer will be powdered, hollowed and peeled.
4. The moisture of the surface of the aerated concrete masonry evaporates quickly, which will cause the moisture evaporation of the masonry and the plastering surface to be out of sync, and the difference in drying shrinkage and deformation will be large, causing the plastering layer to shrink and crack, and hollow.
5. If the surface is fish-scale and loose particles appear, they are not cleaned up before plastering, and an isolation layer is formed between the masonry and the plastering layer, and hollowing occurs due to the decrease of the bonding force.
6. Under the conditions of temperature and humidity changes, the drying shrinkage stress difference between them leads to hollowing.
7. If the strength of the plastering mortar is high, the masonry will have insufficient ability to withstand the shrinkage of the mortar and cause hollowing.
8. If there are few gray seams on the wall, the wall has insufficient embedding force on the plaster layer, which can easily cause the plaster surface to be hollow.
Editor's summary: The wall plastering method of the aerated block and the performance reasons of the aerated concrete block are introduced here, and I hope to help everyone. For more related knowledge, you can follow the information on this website.
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Aerated block wall plastering method
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