Civil Engineering - Concrete Technology - Discussion

Discussion Forum : Concrete Technology - Section 3 (Q.No. 49)
49.
To hydrate 500kg of cement full water needed, is
100 kg
110 kg
120 kg
130 kg
140 kg
Explanation:
No answer description is available. Let's discuss.
Discussion:
29 comments Page 1 of 3.

Lalit chate said:   1 year ago
500× (26÷100) =130 kg.
As per IS 456.
(7)

B.Singh said:   2 years ago
@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.
(4)

Niranjan ghmre said:   2 years ago
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
(1)

Chandan Kumar said:   3 years ago
500kg * 38% = 190kg water is required.
(2)

Ajay Kumar Yadav said:   4 years ago
We have, w/c=0.26.
W= 0.26 *500 = 130.
(2)

Lund chut said:   4 years ago
@Rahul Rana.

For hydration, it needs 23 per cent for hydration and 15 per cent for filling gel space.
(2)

Lund chut said:   4 years ago
@ Rahul Rana.

For hydration, it needs 23 per cent for hydration and 15 per cent for filling gel space.
(2)

Rahul Rana said:   4 years ago
@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.
(2)

Vishal said:   4 years ago
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 said:   4 years ago
For complete hydration, 38% water is needed.

So 500*38/100 = 190 then how the answer is 130?