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Civil Engineering - Concrete Technology - Discussion

Discussion Forum : Concrete Technology - Section 1 (Q.No. 2)
Concrete Technology
2.
If 1500 g of water is required to have a cement paste 1875 g of normal consistency, the percentage of water is,
20%
25%
30%
35%
40%
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
95 comments Page 3 of 10.
NishantRao said:   9 years ago
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:   9 years ago
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.
HARSHA G said:   9 years ago
1500 x 1.25 = 1875.

Therefore 25% is correct.
Nur Asurah said:   9 years ago
How many percent needed to achieve the good quality cement paste?
Sachin Kadam said:   8 years ago
Generally 25-30% but excess water affect on strength (decrease strength).
Mahabub ali said:   5 years ago
According to question 400%.

%of wt =wt of water/wt of cement.
Hence. % of wt =1500/375,
=400%.
This answer only according to question.
But original. (375/1500 )100 =25%.
SUJOY HAZRA said:   8 years ago
(1875-1500) = 375,
375/1500 = 0.25,
0.25 * % = 25%.
Raja said:   8 years ago
1875-1500/1500 = 375 ÷ 1500=0.25 * 100 = 25%.
Baron said:   8 years ago
Why can't we do (1875-1500)/1875*100? Please explain.
Lam said:   8 years ago
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
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