πWhat Is Plastering
π«Plastering is coating which may apply by thin successive layers on a vertical supports of masonry or concrete with a decorative and/or protection aim or to standardize a surface need to support another coating (paint for example).
π§And plastering worker is a worker who works the mortar covering on walls and usually builds work where the cement or the lime is one of the main constituent.
βΊBefore starting plastering the structure which is required for plastering should chiseled used for surface to holding the mortar but in the case of ribbed slab no need of chiseling because HCB can trap the mortar easily.
π·Plastering work has three coats (layers):-
π1. First coat βα α«αͺ αααβ
πΈMix proportion, 1:4 (cement sand by volume with sufficient water) of mortar
πΈSpread by trowel & allowed to cure for 24 hrs before applying second coat.
πΈHas thickness of 0.5 β 1 cm , which is plastered by mortar
π2. Second coat βααα΅β
πΈThis layer is about 1.5cm-2.5cm which is done by mortar
πΈMix ratio is 1:4 (cement: sand by volume)
πΈSet for 21days, before third coat started.
π3. Third coat (fine coat) βααβ
πΈMix ratio is 1:1 (one bag cement and one box of sand)
πΈWhich is done to make the slab, wall & column smooth
πΈThe sand for this task should be sieved to make smooth
Plastering of slab was started after leveled byβ gomawuhalikβ then make align by string with the needed thickness this is called locally βfashaβ. Thickness for fashais take from10 up to 15-cm. In case of quantifying the plastering work all works except the gutter measured in meter square (m2) and the gutter is in meter linear
π²Requirements of good plastering
πΈIt should provide smooth, non-absorb ante and washable surface.
πΈIt should not contract in volume while drying and setting.
πΈIt should adhere firmly to the surface and resist the effect of weather.
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