Civil Engineering - Concrete Technology - Discussion

11. 

Hardening of cement occurs at

[A]. rapid rate during the first few days and afterwards it continues to increase at a decreased rate
[B]. slow rate during the first few days and afterwards it continues to increase at a rapid rate
[C]. uniform rate throughout its age
[D]. none of these.

Answer: Option D

Explanation:

No answer description available for this question.

Hassan said: (Apr 29, 2014)  
Why not option A?

When concrete 1st placed it quickly sets termed as initial setting after which it dries and increase hardening at a decreased rate.

Ashish Bijalwan said: (May 15, 2014)  
The concrete gains strength in first 28 days after that it gains strength very slowly.

Rima said: (May 5, 2015)  
Answer must be A.

Concrete gets harder after initial setting time and its continuous also after 28 days.

Civilguy said: (Nov 1, 2015)  
The concrete is assumed to never gain its complete strength. Hence answer D I guess.

Nit said: (Nov 4, 2015)  
Strength of cement increases initially but after cement strength goes on decreasing. Approximately 50 % after 24 months period.

Khalid said: (Feb 10, 2016)  
I think answer should be A because I read in many literature heat of hydration in 3 days is occurred about 50%.

Vishal said: (May 5, 2016)  
Option A is the correct answer. Please rectify the given answer.

Roshika said: (May 18, 2016)  
Yes, the correct answer should be A.

Darshan H A said: (Jun 30, 2016)  
The correct answer is A because in first 7 days it gains 66% of strength after 28 days it is assumed to gain full strength but after 28 days also there will be an increase in strength gain at the lower rate.

Jaggu said: (Jul 2, 2016)  
I think option A is right answer.

Roshan Adhikar said: (Aug 8, 2016)  
I agree with Jaggu.

Option [A] is a right answer.

Umair said: (Aug 17, 2016)  
The correct answer is Option A.

Prithvi said: (Aug 20, 2016)  
Option A should be the correct answer.

Rahul said: (Aug 21, 2016)  
The answer should be A.

Rahul said: (Aug 21, 2016)  
The answer should be A.

Sk Imtiaj Alam said: (Sep 21, 2016)  
Option A shoud be correct.

Kartik said: (Sep 27, 2016)  
I also agree with @Jaggu.

Sushan said: (Oct 24, 2016)  
Guys it is saying about cement not concrete. So option D is the correct answer.

Bharath E said: (Nov 2, 2016)  
Yes, answer D is correct, it is clearly mentioned in question as Cement and not mentioned concrete anywhere.

Paul said: (Nov 3, 2016)  
@Sushan & @Bharath.

When we did compressive strength testing of cement the process is almost same (using standard sand as aggregate+cement +water) as concrete and the strength gain pattern of cement is also same as concrete.

So, A should be the answer.

Anirudh said: (Nov 6, 2016)  
I think the answer should be A.

Swapnil Pokulwar said: (Nov 19, 2016)  
The question is about cement not on concrete so it's correct no need to rectify it.

Manu said: (Jan 23, 2017)  
Yes, I too agree the right answer is A.

Manish said: (Feb 20, 2017)  
No doubt, the correct answer is A.

Mopi said: (Feb 25, 2017)  
Mainly Due to Hydration of cement only concrete matrix is formed and also strength achievement. Then C2S is responsible for ultimate strength means, why the rate of hydration occurs for longer period.

Venkat said: (Mar 23, 2017)  
Answer a correct. I also agree with it.

Harshdeep said: (Mar 30, 2017)  
It is cement not concrete. So it setting hardening depends upon many factor and one is type of cement.

Sujeet said: (Jun 9, 2017)  
Yes, I also agree that option A is correct.

Zahir said: (Jul 28, 2017)  
The correct answer is A because in first 7 days it gains 66% of strength after 28 days it is assumed to gain full strength but after 28 days also there will be an increase in strength gain at the lower rate.

Dipankar Halder said: (Aug 3, 2017)  
Yes, option A is correct.

Mamatha said: (Aug 3, 2017)  
Option A is right.

Vipul said: (Aug 6, 2017)  
Option A is correct.

Rajesh said: (Sep 25, 2017)  
I think option A is correct.

Nakum said: (Oct 25, 2017)  
Option A is correct.

Payh said: (Nov 27, 2017)  
The Answer should be A.

Ajeet said: (Dec 2, 2017)  
I think D is the correct answer. I agree with the given answer.

Nayan Ahir said: (Dec 13, 2017)  
Agree with option D.

Because it is not specified which type of cement is this.

Narendra said: (Jan 13, 2018)  
I think Option A is correct.

Kunal said: (Jan 18, 2018)  
I think its about hardning not strenght therfore it may be D.

Pavan said: (Feb 14, 2018)  
Option A is the right answer.

Farhan Beigh said: (Mar 18, 2018)  
Option A is right answer.

Ankush Dogra said: (Mar 22, 2018)  
Option A should be the right option.

Viru Kapoor said: (Mar 27, 2018)  
The Question is not about strength.
It is about hardness.

Option D is absolutely correct.

Pr@Veen said: (Apr 8, 2018)  
Option A is the correct answer.

Manzoor said: (Jun 13, 2018)  
Given answer is correct because it talks of cement not concrete and hardening is something different than strength.

Safdar said: (Jun 21, 2018)  
They have asked about cement, not concrete, therefore option D is the correct answer.

Supreeth said: (Jun 28, 2018)  
Concrete gains strength rapidly during initial time later also it gains strength at slow rate.

Sohail Soomro said: (Aug 1, 2018)  
It is the cement that causes the strength gain/ hardening of concrete due to the heat of hydration process that is fast during first 28 days but if it is not rapid in early days it might be uniform though it is also available in options then why the answer is none of these?

Therefore the answer must be a rapid rate during the first few days and afterwards, it continues to increase at a decreased rate.

Khalid Ahmed said: (Oct 5, 2018)  
@All.

Please read the question, it is cement not concrete.

Ram said: (Oct 28, 2018)  
Concrete gets 100 % hard in first 10 hours and it's totally different from strength of concrete so option D is correct.

A Ghaffar said: (Dec 28, 2018)  
Option A is correct. I also agree.

Kashif Khan said: (Jan 11, 2019)  
D is correct.

Here it is mentioned as cement not concrete.

Hemendra Maurya said: (Jan 29, 2019)  
Answer A is correct because cement hydrates rapidly but it gains ultimate strength at decreased rate.

Dipak said: (Feb 1, 2019)  
I also think A is correct.

Abhik said: (Mar 6, 2019)  
Hardening of concrete takes place.

Naveen said: (Apr 27, 2019)  
A is the correct.

Kifayat Ullah said: (Jul 8, 2019)  
It is Concrete not cement. If concrete then option A is the correct option.

Anomies said: (Sep 14, 2019)  
A is the right answer because cement is responsible for hardening in concrete.

Rahul Khan said: (Jan 14, 2020)  
Agree, option A is correct.

Khattak said: (Apr 17, 2020)  
@All.

Cement does not hards itself at ordinary conditions unless water is mixed with it TOF form mortar or concrete by adding other ingredients, so option D must be the correct answer.

Atta Rehman said: (Aug 27, 2020)  
Option A is for concrete, but the question is asking for cement. So, option D is correct.

Farhat Ullah said: (Dec 21, 2020)  
The answer should be A.

Mujib said: (Feb 3, 2021)  
I think the answer should be A.

Bonjamo said: (Mar 14, 2021)  
A is the correct answer for CONCRETE since the strength of concrete after one year compared to 28 days strength is 20 to 25% more.

D is the correct answer for CEMENT since cement final setting time is about 10 hours.

Muneer said: (Apr 18, 2021)  
Hardening occurs rapidly during first few days and continues at the slow rate indefinitely.

Hima said: (Aug 2, 2021)  
Hardness of cement occurs with in 30 minutes to 600 minutes (10 hours).

As Hardness of Cement or Concrete is due to from their Initial and final setting times.

Behroz Ali said: (Aug 23, 2021)  
The Answer Must b A.

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