Quantity Of Cement, Sand, & Aggregates For 1000 sq. ft Slab

Cement, Sand, & Aggregates For 1000 sq ft Slab

To calculate the quantity of cement, sand, and aggregates required for a flat slab, first we need to calculate the volume.

Area of flat slab = 1000 sq.ft =93 sq. m.

The minimum thickness provided for the slab is 150 mm. ( According to IS 456)

150 mm = 0.15 metres

Hence Wet volume = Area of slab x Thickness of slab

Wet volume = 93 x 0.15 = 13.95 cu. m.

To calculate the quantities of materials, we need dry volume

Dry volume = Wet volume x 1.54

Read – Why is 1.54 multiplied with wet volume to get dry volume

∴ Dry volume = 13.95 x 1.54 = 21.48 cu.m (approximately).

Generally, M20 grade concrete is predominantly used for construction purposes.

M20 = 1: 1.5: 3 (Cement : Sand : Aggregates) = (a:b:c)

Quantity Of Cement

Quantity of cement = Dry volume x (a/{a+b+c}

Quantity of cement = Dry volume x (1/{1+1.5+3}) for M20 grade concrete.

= 21.48 x (1/5.5}) = 3.90 cu.m = 3.90 cu.m

We need the quantity of cement in terms of bags.

So by multiplying the quantity of cement by the density of cement, we will get the quantity of cement in terms of kilograms.

Unit weight or Density of cement = 1440 kg/cu.m.

Quantity of cement in kg(s) = 1440 x 3.90 = 5616 kg

We know that 1 cement bag = 50 kgs

∴ No. of cement bags required = 5616/50 kg = 112.32 bags =112 bags.

Quantity Of Sand

Quantity of sand = Dry volume x (b/{a+b+c}

∴ Quantity of sand = Dry volume x (1.5/{1+1.5+3}) for M20 grade concrete.

= 21.48 x (1.5/5.5})  = 5.85 cu.m

Quantity Of Aggregates

Quantity of aggregates = Dry volume x (c/{a+b+c}

∴ Quantity of aggregates = Dry volume x (3/{1+1.5+3}) for M20 grade concrete.

= 21.48 x (3/5.5}) = 11.71 cu.m

Summary

Cement = 112 bags.

Sand = 5.85 cu.m

Aggregates = 11.71 cu.m

Note: ConsiderYield of concrete  as 67% &

Wastages of materials = 2%

You can use the same formula for different mix proportions such as 1:2:4 etc. Here, we have calculated in cubic meter units but you can calculate in cubic feet units.

Also Read

How To Calculate Bricks For Construction

25 Types Of Concrete Used In Construction

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