How to Calculate Quantity for Cement, Sand & Aggregate in Concrete

The content will show you how to calculate quantity for cement, sand and aggregate in concrete. For this, you need to draw a sketch for concrete slab having length 14 feet and breadth of 14 feet and draw the cross-section of this slab having length of 14 feet and the depth of slab is 6 inch which is equal to 0.5 feet.

For the slab, you want to quantity of cement, sand and aggregate. So, for this you need the volume for the slab.

Total volume of slab = v = L * B * D

V = 14 * 14 * 0.5 = 98 CFT (CFT is cubic feet)

Wet volume of concrete = V = 98 CFT

Why to convert wet volume to dry volume?

It is because dry material is used in concrete slab. When water is added with dry volume, the volume of dry material to wet material is decreased. If you want to convert wet volume to dry volume, then

Dry volume = wet volume * 1.54 (constant value)

Dry volume = Vd = 98 * 1.54 = 150.92 CFT

Way to calculate volume of cement

Sum of Ratio of concrete = 1: 2: 4 = 7 (where 1 is for cement, 2 is sand, and 4 is aggregate)

Volume of cement = 1/7 * 150.92 = 21.56 CFT

How many bricks are required for this volume of cement?

Convert to cement bags = volume of cement/volume of bag = 21.56/1.25 = 17.24 bags = 18 bags approx

Volume of sand = 2/7 * 150.92 = 43.12 CFT

Volume of aggregate = 4/7 * 150.92 = 86.24 CFT

To gather more information, go through the following exclusive video tutorial.

Video Courtesy: Civil Engineers