# Civil Engineering - Concrete Technology - Discussion

### Discussion :: Concrete Technology - Section 3 (Q.No.49)

49.

To hydrate 500kg of cement full water needed, is

 [A]. 100 kg [B]. 110 kg [C]. 120 kg [D]. 130 kg [E]. 140 kg

Explanation:

No answer description available for this question.

 Aravind Gottumukkala said: (Aug 29, 2014) % wt of water required for full hydration is 38% by wt of cement. i.e., 38*150/100 = 57 kg.

 Amar Deep Tiwari said: (Sep 20, 2014) % wt of water required for full hydration is 26% by wt of cement. i.e., 26*500/100 = 130 kg.

 Soumya Choudhury said: (Mar 19, 2015) Actually it is 25% of corresponding water of cement. So 500*0.25 = 125 kg. But according to option given answer will be 130 kg.

 Sudhansu Bhagat said: (May 14, 2016) 24%for Hydration of cement + 15% Jel of water. So 24 * 500 :- 120liter.

 Nazira said: (Oct 20, 2016) For complete reaction, 38% of water by weight of cement is required. 0.38 * 500 = 190 kg. But the answer given in this option is 130kg. How?Can anybody explain?

 Swapnil Pokulwar said: (Nov 19, 2016) For 50kg cement, 35 kg water is needed. So, for 500kg its 135 = 130kg.

 Apcivilian said: (Nov 24, 2016) For chemical reaction 23% water needed. For complete reaction it is 38%.

 Suresh said: (Dec 21, 2016) 23% for hydration and 15% to fill gel pores.

 Saifalikhan said: (Jun 18, 2017) 25% for hyderation and 20% to fill gel pores.

 Vijay said: (Aug 13, 2017) 23+15=bound water +gel water = full hydration=0.38. So w/c=0.38=w/500 so w=500 * 0.38=190.

 Minesh said: (Jan 6, 2018) 25% water need to full hydrate of cement.

 Jayrajsinh said: (Feb 8, 2018) Cement 500= 0.35 m3 ( 50 kg cement =0.035 m3 cement ) Water Req for cement 38 %. = 0.35 * 38/woo. = 0.133 m3 Water. From Water Density. 1000 kg/m3 = (kg/0.133 m3). Water = 133 kg.

 Shahbaz said: (Apr 19, 2018) Thanks for the answer @Jayrasinhi.

 Uday Singh said: (Aug 28, 2018) Cement 500= 0.33 m3 ( 50 kg cement =0.033 m3 cement). Water Req for cement 38 %. = 0.33 * 38/woo. = 0.127 m3 Water. From Water Density. 1000 kg/m3 = (kg/0.127 m3). Water = 127 kg.

 Uma Mahesh said: (Sep 6, 2018) Normally the standard weight of cement bag = 50kg it requires 35 litres of water. So 500 kg of cement bag required = 500*35/50 = 135 litres of water.

 Ihsanullah said: (Nov 5, 2018) Water required from 26 to 35 percent.

 Vineet said: (Sep 21, 2019) 0.35*0.38 = 0.133. 0.133 * 1000 = 133kg.

 Ali Zafar said: (Dec 5, 2019) It has been further estimated that about 15% by weight of cement is required to fill up the gel pores and 23% is used for hydation of cement process. So total 38% is required.

 Soumya said: (Apr 19, 2020) For hydration of cement 23% of water is required. So, for 500 kg cement, the answer should be 115kg.

 Gurjant Singh Sawna said: (Jul 6, 2020) For complete hydration, 38% water is needed. So 500*38/100 = 190 then how the answer is 130?

 Vishal said: (Aug 28, 2020) 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.

 Rahul Rana said: (Sep 12, 2020) @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.

 Lund Chut said: (Oct 5, 2020) @ Rahul Rana. For hydration, it needs 23 per cent for hydration and 15 per cent for filling gel space.

 Lund Chut said: (Oct 5, 2020) @Rahul Rana. For hydration, it needs 23 per cent for hydration and 15 per cent for filling gel space.

 Ajay Kumar Yadav said: (Oct 17, 2020) We have, w/c=0.26. W= 0.26 *500 = 130.