Length of slab = l = 14 feet
Breadth of slab = b = 14 feet
Thickness of slab = 6 inch = o.5 ft
Now volume of slab = l x b x thickness = 24 x 14 x .05 = 98 cft (this is wet volume of slab)
Converted to dry volume = Vd = wet volume x 1.54 = 98 x 1.54 = 150.92 cft
Select the Concrete ratio : 1 : 2 : 4 this is M15 grade of concrete
Sum of ratio = 1+2+4 = 7
Volume of Cement = 1/7 x dry volume , Here 1 is cement and 7 is sum of ratio
Volume of Cement = 1 / 7 x 150.92 = 21.56 cft
Converted to cement bags = Volume of cement / volume of one cement bag = 21.56 / 1.25 = 17.24 say 18 No’s of bags.
Volume of Sand = 2 / 7 x dry volume , Here 2 is cement and 7 is sum of ratio
Volume of sand = 2 / 7 x 150.92 = 43.12 cft
Volume of Aggregate = 4 / 7 x dry volume , Here 4 is cement and 7 is sum of ratio
Volume of Aggregate = 4 / 7 x 150.92 = 86.24 cft
Unit price per item
- Cement bag = Rs: 550
- Sand per cft = Rs: 20
- Aggregate per cft = Rs: 28
Cost of materials
Amount of Cement = No’s of cement bag x Cement per bag price
18 x 550 = Rs /= 9900
Amount of Sand = total volume x Unite rate of sand = 43.12 x 20 = Rs /= 862
Amount of Aggregate = total volume of aggregate x unit rate of aggregate = 86.24 x 28 = Rs /= 2369
Total Cost for construction of slab = 9900 + 862 + 2369 = Rs /= 13131
The above image i have screen shot from my channel video . and I already made a video lecture That How to calculate quantity of cement , sand and aggregate in slab .
Note: When we construct the concrete slab so that time we can used two procedure to find out the quantity of materials in slab . one we can simple find out the volume of slab and easily can find the different quantity of materials like cement, sand and aggregate. but in send way some time we fill the beam from concrete (Top beams) so that time on the spot we can construct the beam and slab on each time. so for that first we have to find out the volume of total beam and than we add the volume of beam with slab and that time both volume ( column and slab ) volume will be the total concrete volume for the slab. And after that we have to find out the materials quantity in the slab.
But if we used the large amount of steel than we should be subtract the steel volume from the total volume of slab. because the steel can also cover the volume in the slab. therefore it should be deduct for the total volume of the slab. than it will be give us the actual quantity of slab.
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