Material requirements: Cement type and label: cement with high early strength and good stability should be used. The sand and surface stones used in the scrub bottom or cushion should be clean and free of impurities, and the mud content of the sand should not exceed 3%. Sieve before use. The stone used for the surface layer should be the same color, and the stone particle size should be selected according to the requirements of the plaster part and style, etc., and washed before the screening classification and use, stacked and covered. Washing water: should be clean, do not contain soil, grease and other plasticizing, generally using tap water. Stone ash paste: lump quicklime is used after more than 15d curing period to form stone ash paste.
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(2) basic treatment
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The base should carefully clean up the surface debris, the scaffold holes are filled and the large area on the surface of the concrete wall should be picked out and brushed, the honeycomb low concave, the missing edge off the corner, should first brush a 107 glue: water = 1:1 cement slurry, and then use 1:3 cement mortar layer repair.
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(3) Leveling the bottom layer and cushion mortar
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After the wall base is treated and cleaned, the wall should be watered fully the day before the plastering begins according to different bases and different seasons, and the wall should be watered thoroughly and evenly to wash away the residual floating soil on the surface. With 1:0.5:4 cement lime mortar, make a gray cake of about 7cm at the top of the wall and the root of the wall at the position of the standard reinforcement, and then add several gray cakes in the middle, and then level all the gray cakes according to the straight line of the wall and the four corners of the wire mesh, connect the same straight gray cake into a standard reinforcement, and use a wooden trow to compact the leveling and sprinkling water for maintenance, so as to ensure the formation of the bottom layer and the cushion.
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When the bottom mortar is 6 ~ 7 dry, referring to the method of finding rules for brick walls, from top to bottom pull vertical lines, horizontal lines, paste gray cake to make standard reinforcement, set square and so on to find rules, then wipe 1:3 cement mortar leveling, according to the rules and standard reinforcement with a ruler scraping compaction, with a wooden trowel, the total thickness is controlled within 12mm, the time interval of each layer of plastering should be appropriate to prevent falling and cracking.
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(4) Brush surface construction
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① Paste divider strips
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After the bottom layer or cushion layer is coated, when the mortar is 6-7 to dry, according to the design requirements, the line is determined to determine the location of the grid strip, but it must be noted that the horizontal strip is uniform in size and the vertical strip is symmetrical. The section height of the wood strip is the thickness and width of the cover layer to make the trapezoidal inside narrow and outside wide, and the grid strip should be soaked in water before pasting to prevent the expansion of the grid strip after plastering; When pasting, it is firmly bonded with plain cement slurry on and under the grid strip; After pasting, it should be horizontal and vertical, close and smooth.
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② Cover the stone paste
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After the bottom layer or cushion reaches a certain strength and the grid strip is pasted, water and wet according to the dry and wet degree of the bottom layer, and scrape the first thin and uniform cement slurry, which is the key to prevent empty drums. The thickness of the scraping is about 1mm, followed by 1:2 ~ 1:2.8 cement stone slurry with a steel trowel (depending on the size of the stone particles, if the small eight particles should be 1:2.5, if the millstone should be 1:2.8). Before operation, sample test should be done, and appropriate amount of stone plaster paste can be added for convenient operation.