#Plastering,#Requirements of good 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).

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. Before 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.

Plastering work has three coats (layers):-

1,First coat “berarigirf”

🔸Mix proportion, 1:4 (cement sand by volume with sufficient water) of mortar

🔸Spread by trowel & allowed to cure for 24 hrs before applying second coat.

🔸Has thickness of 0.5 – 1 cm , which is plastered by mortar

2,Second coat “mulet”

This layer is about 1.5cm-2.5cm which is done by mortar

Mix ratio is 1:4 (cement: sand by volume)

Set for 21days, before third coat started.

3,Third coat (fine coat) “feno”

Mix ratio is 1:1 (one bag cement and one box of sand)

Which is done to make the slab, wall & column smooth

The sand for this task should be sieved to make smooth

Plastering of slab was started after leveled by” gomawuhalik” then make align by string with the needed thickness this is called locally “fasha”. 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

🚧Requirements of good plastering

It should provide smooth, non-absorb ante and washable surface.

It should not contract in volume while drying and setting.

It should adhere firmly to the surface and resist the effect of weather.

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Different methods of road construction in civil engineering
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1/14/2022

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