Concrete Slab Quantities

How to Calculate Material

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We have a very simple method to use for material Quantities:

How to Calculate material Quantities?

Let's we disscus an example to understand

We have a slab having Size 100ft x 100 ft with 5inch thickness. Use Concrete  Ratio 1:2:4.Calculate Quantities of material used.

First of All we do find Wet Volume of Slab which is:

Wet Volume= 100x100x 5/12= 4200 Cft .

Dry Volume= 4200 x 1.54 =6468 Cft.

Note: Here's 1.54 used Concrete Dry factor.

Ratio of Concrete is=  1:2:4

Sum of Ratio= 7

✓Cement = Ratio of Cement/Sum of Ratio x Dry Vol.

                 = 1/7x 6468= 924 Cft.

One Cement. Bag Vol. Is 1.25 Cft.

So, 924/1.25= 739.2 

we can say 740 Bags of Cement used.

✓Sand= Ratio of Sand/Sum of Ratio x Dry Volume

                = 2/7x 6468= 1848 Cft 

✓ Crush= Ratio of Crush/Sum of Ratio x Dry Volume

                = 4/7x 6468= 3696 Cft.

It Means We Used Cement 740 Bags.

                                  Sand 1848 Cft.

                                  Crush 3696 Cft.

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If we talk about Water Quantity, we can Also Calculate

Select Water Cement Ratio = 0.40

Quantity of Water

= W/C X Number of Cement Bags used X 50

=0.40 x 740 x 50= 14800 Liters.

Hope you all understand this if anyone have query about topic can ask in comment box I will reply

And I request you to share this informative topic will your friends like Engineers or Technologist.

During Site work or Estimation these Basics are very important for Civil Engineers or Technologists.

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[Engineer Amir Abbasi]