Category Archives: grade

Free Video for you on Concrete. [Grade from Ratio and vice versa]

Hello Friends ,

Enjoying the day ?

Every construction person needs to know these :

  1. How to find out the grade of concrete if the ratio is known
  2. How to find the ratio if the grade is given.

Right ?

Just spend 12 minutes of your busy time in watching the following video and you shall know the trick. Learn through the simple to follow steps and master the technique.

Concrete : Grade to Ratio 

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What is this 20 in M20 ?

What does the 20 of the M20 concrete stands for? by Santosh Kulkarni https://www.quora.com/What-does-the-20-of-the-M20-concrete-stands-for/answer/Santosh-Kulkarni-37?share=9b8802a3&srid=zM5g

What is the maximum cement quantity for m25 grade concrete using admixture, considering all the other features?

Answer by Mihir Salanke:

Mix proportion for M25 grade of concrete is 1:1:2(cement:fine aggregates:coarse aggregates). So if you need 4cu.m of M25 concrete, we need to have 1cu.m of cement. So, theoretically, for 1cu.m of M25 concrete, we need to have 0.25cu.m of cement.

But in practice, whenever we estimate quantity of cement for concrete or mortar, we consider 50-55% extra quantity. This extra quantity is for voids, wastage, etc.

So, for preparing 1cu.m of M25 concrete, quantity (dry volume) of cement required = 1.55 X 0.25 = 0.3875 cu.m
Now a bag of cement(50 kg) corresponds to 0.035cu.m of cement.
Hence 11 bags of cement are required for preparing 1cu.m of M25 concrete.

Admixtures(like plasticisers, super plasticisers) are usually added to increase workability of the mix at lower water cement ratio. So, I don’t think addition of admixture would change the quantity of cement.

What is the maximum cement quantity for m25 grade concrete using admixture, considering all the other features?