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Estimation of materials required in Cement Plaster

Author: S M Hasnat Jamil / Catagory: Suggestion / 16 October, 2020 / 668 views

Suppose we have an Area of the 200-meter square (Length, Width) over that area we need to perform plaster and the ratio of cement and sand we are using 1: 4 and the thickness of plaster will be 13 mm.

1. So calculate the required quantity of water, Cement and Sand use in this plaster?

GIVEN DATA:

Plaster Thickness = 13 mm = 0.013 m <Remarks 1 m = 1000 mm>

Area = 200 meter square

Ratio = 1: 4

Quantity =?

SOLUTION:

First, we calculate the volume of the plaster (Wet volume) and the volume we calculated is a wet volume (water+wastage+bulking of sand) then we convert this volume into the dry volume. After calculating the volume we just find the quantity of cement, Sand and water required in this plaster work according to these given data.

The volume of cement mortar required = (Area of Plaster x Thickness)

Volume of cement mortar required = 200 x 0.013

Volume of cement mortar required = 2.6 (wet volume)

So 2.6-meter cube is a wet volume of cement mortar (with water). But we need dry volume to get dry volume to consider 20% bulking of the sand and 15% Wastage of the sand at the site.

=2.6 meter cube x (1 + 0.2 + 0.15) <Remarks 20/100 % = 0.20 or just multiply by 1.35 >

=3.51 (dry Volume).

CEMENT REQUIRED:

Cement: = (Dry volume x Ratio x Density of cement)/Sum of ratio

Cement : = (3.51 x 1 x 1440)/5 < Density of cement is 1440 kg/meter cube >

Cement : = 1010.88 kg /50 < 1 bag of cement is 50 kg >

Cement : = 20.21 bags

SAND REQUIRED:

Sand : = (Dry volume x Ratio x 35.3147)/Sum of ratio

Sand : = (3.51 x 4 x 35.3147)/5 < 1 meter cube = 35.3147 cubic feet >

Sand : = 99.16 Cubic feet.

WATER REQUIRED:

Water : = (Weight of cement x water cement ratio)

Water : = 1010.88 x 0.5 < 0.5 kg water every 1 kg of Cement >

Water : = 505.4 kg or 505.4 Litters.

CONCLUSION:

Cement := 1010.88 kg

Sand: = 99.16 cubic feet

Water: = 505.4 Litters

So these quantities are going to use in a 13 mm thick plaster.

Note: The water-cement ratio 0.5 is not fixed it depends on the which type of plaster is going to do or the compressive strength we get after fixing the water-cement ratio in 1: 4 mix.

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