Civil Engineering - Concrete Technology - Discussion

2. 

If 1500 g of water is required to have a cement paste 1875 g of normal consistency, the percentage of water is,

[A]. 20%
[B]. 25%
[C]. 30%
[D]. 35%
[E]. 40%

Answer: Option B

Explanation:

No answer description available for this question.

B.Arun Kumar said: (May 31, 2013)  
Percentage of water = wt of cement/weight of water = (1875-1500)/[1500]*100 = 25%.

Prof. P. Rajayogan said: (Jul 23, 2013)  
Percentage of water = (wt.of water/wt.of cement)100.

Question should be revised as follows

If 375 ml or g of water is required to have a cement paste 1875 g of normal consistency, the percentage of water is,

Wt.of water = 375 g.

Wt.of cement = 1875-375 = 1500 g.

Normal Consistency = (375/1500)*100.

= 25%.

Malavika said: (Aug 18, 2013)  
Which one of the answer is correct. According to the question the weight of the water is 1500g why should we take 375g.

Uma said: (Aug 20, 2013)  
Weight of water = 1500g.

Weight of cement paste = 1875g.

Weight of cement = 1875-1500.

= 375g.

% of water = wt.of cement/wt.of water.

= (375/1500)*100.

= 25%.

Usha Rani said: (Aug 20, 2013)  
@Malavika.

As normal consistency test is conducted by mixing water and cement. The value 1875 is for both cement and water. When we subtract water value i.e. 1500g from whole 1875 (cement water paste) we get the weight of the cement.

Jay said: (Aug 23, 2013)  
@B.Arun Kumar, @Malavika.

As per the question,

The percentage of water = (weight of water/ weight of whole mixture)*100.

= (1500/1875)*100.

Nitin said: (Sep 26, 2013)  
If we will add 1500 gm of water in 375 gm of cement then will it be a cement paste or cement solution ? I am satisfied with Prof. P. Rajayogan's comment.

Shamim Alam said: (Oct 20, 2013)  
weight of cement - weight of water/weight of tare wt*100

a - b/b*100.

So, 1875-1500 = 375/1500*100 = 25%.

Vr Chowdary said: (Nov 4, 2013)  
Percentage of water = wt of cement/weight of water = (1875-1500)/[1500]*100 = 25%.

Rakesh said: (Nov 5, 2013)  
Simply p of water = (375/1500)*100 = 25%.

Sanjay Rakholiya said: (Nov 22, 2013)  
Percentage of water = 1875-1500/1500 = 25%.

Subhro Moitra said: (Dec 24, 2013)  
If we take 1500 gm of water then.

Weight of water=400% of weight of cement. Would it be of standard consistency?

Prof. @Rajayogan and Mr @Nitin are right.

Saboor said: (Jan 19, 2014)  
@Malavika.

The water cement ratio should not increase or should not exceed 50% weight of cement. The question shall be recapitulated as sir has said.

Nile said: (Jan 22, 2014)  
What would be the standard consistency to know good quality of cement?

Jairaj said: (Apr 17, 2014)  
The standard normal consistency of cement is 22% to 30% of weight of dry cement. If satisfied my answer then give a comment on this.

Bangada Mangisto Livino said: (Apr 30, 2014)  
Given: Mass of water 1500g, Mass of paste 1875g and Mass of cement is given by,

1875g - 1500g = 375g.

%Mass of water = (Mass of cement/Mass of water).100%.

= (375/1500).100%.
= (0.25).100%.
= 25% Ans. required.

Vishal Dave said: (May 7, 2014)  
The percentage = 1875-1500/1500 = 0.25*100 = 25%.

Afroz said: (May 18, 2014)  
Total cement past weight 1875-1500 = 375g.

Weight of cement = 1500g.

Normal consistancy is the the amount of water which mixed in neat cement so that gauge of vicat appartes should be insert in cement past 35mm to 37mm. It takes as a percentage.

So,
Normal consistency of cement or percentage og water is.

375/1500*100 = 25%.

S.Raghuraman said: (May 24, 2014)  
Some times this type of questions brings confusion in budding Engineers.

Arun Krishna said: (Jul 24, 2014)  
Can anyone make the right conclusion with proper evidence please?

Zia said: (Aug 26, 2014)  
Well prof is right.

While wt.of cement/wt of water will give ratio not %.

Gali Nagendra said: (Sep 24, 2014)  
0.85*consistency*wt.of cement = wt.of water.

Kiran Birajdar said: (Dec 3, 2014)  
Given data:

Weight of cement = 1875gm.
Weight of water = 1500gm.

Solution:

Weight of cement = 1875-1500 = 375gm.

% of water = (Weight of cement/Weight of water)*100 = (1875-1500/1500)*100 = 25%.

Ramesh said: (Dec 3, 2014)  
I am agree with Prof.P. Rajayogan.

Khemraj Regmi said: (Dec 5, 2014)  
My question for the participants of this discussion forum is that where is the formula for the percentage water as weight of cement divided by weight of water?

I agree with Prof. P. Rajayogan. Thank you Prof. I have the long time confusion for this question. I am also thinking so but I am not getting single one to report this question like that.

Mohd Sarfraz said: (Mar 18, 2015)  
It is very simple water percentage is 25 If any guy doubt it than any other contact me than I will prove it.

Himanshu Jain said: (Apr 10, 2015)  
According to this question.

Weight of water = 1500 g.

Weight of cement paste = 1875 g.

Percentage age of water = (Weight of water/Weight of paste)x100%.

i.e 5 = (1500/1875)x100.

=> 80%.

Gaurav Giri said: (May 29, 2015)  
Weight of cement = 1875-1500 = 375.

So % of water = 375/wt of water.

= 375/1500*100.
= 25%.

Abukhaled said: (Jun 18, 2015)  
Wt. of water = 1500 gm.

Wt. of cement = 1875-1500 = 375 gm.

w/c = 1500/375 = 40%.

This means each 1 gm of cement needs 4 gms of water.

Tony said: (Aug 9, 2015)  
But, weight of water is 1500g.

So % = Weight of water/Weight of paste*100.

= 1500/1875*100 = 80%.

Sagar said: (Aug 13, 2015)  
What in earth, the percentage of water = wt. of cement/wt. of water.

% of water would be (wt. of water/wt. of paste)*100.

Medo said: (Sep 4, 2015)  
1500/1875 = 80% is the right answer.

Hassanain Turi said: (Sep 15, 2015)  
As stated in question 1500 g of water and paste is 1875 then simply we get (weight of water/water+cement)*100 = (1500/1875)*100 = 80%.

Koteswararao said: (Sep 27, 2015)  
Weight of cement = 1875-1500 = 375.

Weight of water = 1500.

w/c = 375/1500*100 = 25%.

Mann said: (Oct 13, 2015)  
As we know the formula for water content = wt. of water/wt. solid.

Similarly here, % of water = (wt. of water/wt. of cement) x 100.

So, the data given I question is wrong, wt. of water should be 375 g, and wt of cement paste is 1875 g.

Sabya said: (Oct 15, 2015)  
Sir I can't understand why the weight of water is taken (1875-1500) = 375 gm?

Here as per question the wt of water = 1500 gm.

Wt of cement = 375 gm.

And we know that % of water = (WT OF WATER/WT OF CEMENT)*100.

Najrul said: (Oct 15, 2015)  
Wt of cement = 1875-1500 = 375.

Wt of water = 1500.

% of water required = 375/1500*100 = 25% answer.

Darshan H A said: (Jan 18, 2016)  
Normal consistency is the ratio of w/c, hence in the question weight of cement is 1500 and weight of water is 1875-1500 = 375.

The question it self is wrong. By understanding the concept we can calculate consistency = 375/1500 x 100 = 25%.

Ken said: (Feb 20, 2016)  
Is this o/o of water constant or what I want to know?

Mohamad said: (Feb 28, 2016)  
I agree with my colleagues that the question is wrong.

The water weight should be 375 gram.

Medhat Abdulaziz said: (Apr 28, 2016)  
Calculate the percentage of water (P) by weight of dry cement required to prepare cement paste of standard consistency by the following a formula, and express it in the first place of decimal.

Cement consistency 1.

P = (W/C)*100

Where,

W = Quantity of water added.

C = Quantity of cement used.

Antony Praveen said: (Aug 17, 2016)  
@ Malavika & @Rajayogan.

Why we calculate the percentage of water. What's benefits? Please discuss with us.

Md Samsuzzaman said: (Aug 31, 2016)  
Actually, if we consider the above question then the answer will be 400%.

Y. Vamsi Krishna said: (Sep 3, 2016)  
Normal consistency of water (%) = (wt.of water/wt .of cement) * 100,
Then given

wt .of water : 1500.
wt.of cement : 1875.
= (1500/1875) * 100 = 80%.

Protin said: (Sep 12, 2016)  
I agree with Rajayogan. If the weight of cement is only 375 gms and the water is 1500 gms/ml, try mixing it to make a paste, practically it won't form a paste but it will become a solution of cement and water. But 1500gms of cement and 375 gms of water is possible to make a paste.

So the question shall be recapitulated as stated by Prof. Sir.

Bharat Muduli said: (Oct 25, 2016)  
Percentage of water = wt of cement/weight of water = (1875 - 1500)/[1500] * 100 = 25%.

Aftab Alam said: (Nov 9, 2016)  
Percentage of water = wt of water/wt of cement.

Agree @ P. Rajayogan.

Baloch said: (Nov 13, 2016)  
P = w/c * 100.

Where, w = weight of water, c = weight of cement.

Denzil said: (Dec 2, 2016)  
Wt. of cement = 1875 - 1500 = 375.
Water/cement ratio (or ratio of water per dry cement) = 1500/375 = 4.0.
%water = 400% -------> this is the answer.

Whoever using this kind of mix, and will say the resulting paste is of normal consistency.

Jack said: (Dec 16, 2016)  
% of water is not equal to (wt of water/wt of cement) x 100.

% of water = (wt of water/wt of cement paste) x 100.
= 1500/1875 x 100,
= 80%.

And hence the cement content must be 20%.
% of cement = (1875-1500)/1875 x 100 = 20%.

Janardan Mondal said: (Dec 29, 2016)  
Percentage of water = (wt.of water/wt.of cement)100.

Question should be revised as follows:

If 375 ml or g of water is required to have a cement paste 1875 g of normal consistency, the percentage of water is,

Wt.of water = 1500 g.

Wt.of cement = 1875-1500 = 375 g.

Normal Consistency = (1500/375) * 100.

= 400%.

S R Meena said: (Jan 23, 2017)  
1875 - 1500/1500 * 100 = 25%.

Nishantrao said: (Feb 8, 2017)  
You need 1500 gm of water to make cement paste of 1875 gm i.e. you have 375 gm of cement. Hence, theoretically, NC of your Cement is 400%. Which is too much for any cement available in the market.

Harsha G said: (Feb 23, 2017)  
1500 x 1.25 = 1875.

Therefore 25% is correct.

Harsha G said: (Feb 23, 2017)  
P = (W/C) * 100,
P = CONSINSTENCY,
W = QUANTITY OF WATER ADDED,
C = QUANTITY OF CEMENT USED,
P = (375/1500) * 100.
ANS = 25%.

SIMPLY MULTIPLY THE OPTIONS TO GET 1875 BY % LIKE 1.25 * 1500 = 1875.
So, 25% IS RIGHT.

Nur Asurah said: (Mar 30, 2017)  
How many percent needed to achieve the good quality cement paste?

Sachin Kadam said: (Apr 12, 2017)  
Generally 25-30% but excess water affect on strength (decrease strength).

Adam said: (May 19, 2017)  
Just imagine 1875 nos of fruit in a box 1500 apple and 375 oranges.

Obiously, percentage of apple is high => 1500/1875x100 = 80% and for oranges 375/1875x100 = 20%.

Similarly, water should be 80% and cement is 20%.

Sujoy Hazra said: (Jul 21, 2017)  
(1875-1500) = 375,
375/1500 = 0.25,
0.25 * % = 25%.

Raja said: (Aug 6, 2017)  
1875-1500/1500 = 375 ÷ 1500=0.25 * 100 = 25%.

Baron said: (Sep 2, 2017)  
Why can't we do (1875-1500)/1875*100? Please explain.

Lam said: (Sep 30, 2017)  
1500 g of water mix with 375 g of cement it's not possible for use in any construction.

I agree with Prof.P.Rajayogan

Rms said: (Oct 31, 2017)  
Without any comment, I agree with Prof. P. Rajayogan.

Rashmi said: (Dec 26, 2017)  
But the consistency already looks for water weight. How to tally it?

Chethan said: (Jan 1, 2018)  
As per code, w/c ratio has not exceeded 1 so wt of water should be less than wt of cement.

Muhammad Noman said: (Jan 16, 2018)  
W of cement= W of cement paste-W of water=1875-1500=375.
W of water=1500.
%age of water or P=(W of water/W of cement)*100=1500/375*100= %.

Dipyaman Ghosh said: (Jun 24, 2018)  
As I understand, actually the cement would have been 1500 gm, and water 375 gm.

Also think it subjectively, for 375 gm cement, if 1500 gm water is used, the chances of bleeding would be higher, and the slumping test results might come jeopardized hence rendering the cement to be not fit for structural use.

Sameer Sopori said: (Aug 4, 2018)  
@Prof. P. Rajayogan.

It's clearly mentioned the water is 1500 g.
and when we mix it with the cement its weight becomes 1875 g, so it means cement weight is 375 gm.

The water percentage = )375/1500) * 100 = 25%.

Yogesh Daharwal said: (Aug 23, 2018)  
I agree @Rajayogan.

If the weight of cement is only 375 gms and the water is 1500 gms/ml, try mixing it to make a paste, practically it won't form a paste but it will become a solution of cement and water. But 1500gms of cement and 375 gms of water is possible to make a paste.

James said: (Aug 27, 2018)  
As per my knowledge,
Water/ Cement ratio means Water (1500g)/Cement. (375g)=400%.

Alam said: (Oct 27, 2018)  
The weight of water = 1500 gm.
The weight of cement paste = 1875 gm.
Weight of cement =(1875-1500)= 375 gm.
% of water = (wt.of cement/wt.of water) * 100.
= (375/1500) * 100.
= 25%.

Er. Amol Bagul said: (Dec 20, 2018)  
1875-1500/1500 = 375 ÷ 1500 = 0.25 * 100 = 25%.

Sami Ullah said: (Jan 1, 2019)  
@All.

If 1500g of cement is requured to have a cement paste 1875g of normal consistancy, the %age of water is;

Then it will be like,
Cement = 1500g,
Paste = 1875g,
Then water = 1875-1500= 375g.

And w/c ratio = (wtr/ cement) * 100 = (375/ 1500) * 100 = 25%.

Upender said: (Jan 21, 2019)  
Percentage of water = weight of cement/weight of water * 100 =1875-1500/1500 * 100= 25%.

Faysal said: (Apr 5, 2019)  
1875/1500 = 1.25.
1.25-1 * 100 =25%.

Farid Khan said: (Apr 12, 2019)  
If 1500 g of water is required to have a cement paste 1875 g of normal consistency, the percentage of water is,

According to the question.
Cement paste=1875.
Water=1500.
Cement =1875-1500=375.

Now if we want to know the percentage of cement then=(wt of cement/wt of water) *100
=375/1500*100=25%.

And if want to know the percentage of water then =wt of water/wt of cement *100
=1500/375*100 = 400%.

Sudesh said: (Apr 29, 2019)  
@Farid.

You're right It's 400%.
Hence For Possible For Cement Paste.
Question Should be 1500gm Cement for 25%.

Rajendra Saindane said: (May 11, 2019)  
I also agree with your concept @P. Rajayogan.

Ewunetu Molla said: (Jul 29, 2019)  
Cement paste= water +cement = 1875g,
Amount of water =1500g,
%Water = (1875-1500)/1500 = 25%.

Jitendra Kumar said: (Oct 31, 2019)  
Actually in the question, in place of 'water', it should have been 'cement'. In that case:
Percentage of water will be = (wt of water/wt of cement)*100.
= (1875-1500)*100.
= 25%

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