how to calculate quantity of cement mortar in plastering and what is plastering work and its type and How to calculate quantity cement mortar in plaster and also cement mortar calculation for plastering.
What is plastering ?
Plastering is a thin layer of mortar applied over the rough surface of brick wall and it acts as “damp proof coat” over the brick work .plastering also provide fine and finish surface over the brick wall that is firm and smooth and it enhances the appearance of of brick wall building.
What is thickness of plastering ?
There is a two types of plastering work first one is internal plastering of brick wall and second one is external plastering of brick wall.
In internal plastering of brick wall plaster thickness is about 12 mm and in the case of external plastering work of brick wall plaster thickness is about 18 mm to 20 mm
and also plastering work is done on the RCC slab ,in the case of RCC plastering thickness is about 6 mm.
What are types of plastering?
●(1) lime plaster:- in the case of lime plaster lime is used as binding material for the plastering work of brick wall
●( 2) cement plaster:- in the case of cement plaster cement is used as binding material for the plastering work of brick wall
● (3) mud plaster :– in the case of mud plaster mud is used as binding material for the plastering work of brick wall
calculate the quantity of cement and sand for plastering
Brick wall size = 1 m× 1m
Mortar thickness in the case of internal plaster work t = 12 mm
Wet volume of mortar = A× t
Vw = wet volume
Vw = 1m× 1m × 12mm
Vw = 1m2 × 0.012m
Wet volume = 0.012 m3
You know that wet volumes contains water and its bubble it can be remove by pressing the Plaster that’s require more quantity of mortar material mixture of sand and cement ,that is dry volume
hence dry volume is increased by 33% of wet volume . so we have to convert wet volume in dry volume by conversion factor multiplying 1.33
● dry volume = 1.33×wet volume
Dry volume = 1.33×0.012 m3
Dry volume = 0.01596 m3
Mix Ratio of cement mortar for plastering
mix ratio of sand and cement which are used in plastering work of brick wall is 1:6, in this ratio 1 part is cement and 6 part is sand.
● mix ratio = 1:6
Total R = 1+6 =7
Dry volume =0.01596 m3
Quantity of cement required for plastering
Weight of cement = volume ×density
Density of cement= 1440 kg/m3
Weight = 1/7×0.01596 m3×1440 kg/m3
Weight of cement =3.28 kg
Some amount of Cement Solution are also used as binding material for plastering work it will be about 25%
Weight of Cement Solution=3.28×25/100
Now Total weight of cement required for plastering work= 3.28 kg+ 0.82 kg=4.1kg
4.1 kg of cement is required for for 1 square metre (m2) plastering of brick wall
Quantity of sand required for 1m2 plastering
● quantity of sand in CFT:- in the mix ratio of mortar 6 part is sand used in plastering work of brick wall
Volume of sand = 6/7×0.01596m3
1 m3 = 35.3147 ft3
Putting this value we get
Volume of sand =6/7×0.01596 × 35.3147 cft
Quantity of sand =0.483 CFT
0.483 cuft sand is required for plastering of 1 square metre brick wall
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