Civil Engineering - Concrete Technology - Discussion

Total water requirements for Complete the chemical reaction Is 38 %,

So, 38 * 500 = 19.

Because 23% of the water required for hydration process & 15 water is required for filling the gell pores.

So, total (23+15) = 38% water is required to complete the total chemical reaction.

@Gurjant Singh Sawna.

For Hydration of cement only it requires *26% of water by Mass* for 500kg of cement it will be 130 kg of water.

Those who are saying 38% or 40% it is for (*Hydration+ gel pores filling*).

It is NOT necessary that for the process of "Hydration" the gel pores should be "saturated".

We think that fully hydration means for "chemical reaction & pores filling" both but Hydration means chemical reaction btwn cement and water only.

@ Rahul Rana.


For hydration, it needs 23 per cent for hydration and 15 per cent for filling gel space.

@Rahul Rana.

For hydration, it needs 23 per cent for hydration and 15 per cent for filling gel space.

We have, w/c=0.26.
W= 0.26 *500 = 130.

500kg * 38% = 190kg water is required.

the question has said for hydration, not complete hydration
so, 15% water is used by cement to fill voids(pores) and 23% for hydration so for complete hydration we should use 23+15=38%
but as per question for hydration:: 500*.23= 115 so near value is 120 kg . 120 kg is right answer

@All,

The question has said for hydration, not complete hydration. So we will consider 23% only.

Then, (0.23* 500 = 115) Approx = 120 kg Answer.

500× (26÷100) =130 kg.
As per IS 456.

Thanks @Lalit chate.

The correct answer is indeed 130kg.