Civil Engineering - Concrete Technology - Discussion

28. 

Pick up the incorrect statement from the following:

[A]. Admixtures accelerate hydration
[B]. Admixtures make concrete water proof
[C]. Admixtures make concrete acid proof
[D]. Admixtures give high strength
[E]. None of these.

Answer: Option A

Explanation:

No answer description available for this question.

Dr Yousif Ahmed said: (Jan 29, 2015)  
The answer should be E as there are some admixtures that accelerate hydration.

Tarun said: (Aug 22, 2015)  
Really answer will be E because admixtures perform various kind of functions not the single one like accelerating.

R.M. said: (Aug 17, 2016)  
Yes, the right answer must be E.

Shivkumar said: (Nov 7, 2016)  
Only E is the right answer.

Baloch said: (Nov 12, 2016)  
The answer is option E, @All are correct.

Xiyo said: (Jan 10, 2017)  
A is the incorrect statement.

I agree with the answer.

Mahi said: (Apr 4, 2017)  
If accelerator is admixture then Answer is E.

Ehsankhosa said: (May 9, 2017)  
Yes, Option E is correct.

Kushvaha said: (May 14, 2017)  
The correct option is D no admixtures is give strength so how to give high strength.

Gujjar said: (May 31, 2017)  
The correct answer is option E.

Shailendra said: (Jul 27, 2017)  
The Option A is Correct.

These admixtures are used for following purposes:

1) To achieve a higher strength by decreasing the water cement ratio at the same workability as an admixture free mix.

2) To achieve the same workability by decreasing the cement content so as to reduce the heat of hydration in mass concrete.

3) To increase the workability so as to ease placing in accessible locations, Water reduction more than 5% but less than 12%.

4) The commonly used admixtures are Ligno-sulphonates and hydrocarboxylic acid salts.

Vikash said: (Oct 25, 2017)  
Admixture never gives strength.

Gaurav said: (Dec 21, 2017)  
Admixture can accelerate the rate of hydration.

So, Option E correct.

Chandra Pratap Singh said: (May 5, 2018)  
The Answer should be D.

Admixture never gives strength it only accelerate the rate of gain of strength.

Rinkesh said: (May 18, 2018)  
D is the correct answer.

Sandeep said: (Jul 21, 2018)  
I think D is the correct answer.

Sarada said: (Dec 17, 2018)  
Admixture never gives strength.

Faraz Ahmed said: (Apr 14, 2019)  
Answer is A. Because hydration process depends only on water content and temperature but not on admixtures.

There will be no hydration if we add admixture in mix in absence of water or at the low temperature because the hydration is the chemical reaction which is directly initiated by temperature and water.

Pankaj said: (Jun 22, 2019)  
I agree @Faraz.

Bal Krishna Gautam said: (Nov 7, 2019)  
Many chemical admixtures are known to retard cement hydration.

Hebadh said: (Feb 3, 2020)  
D is the correct answer. No any admixture gives strength. Its only used for initial purposes.

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