Civil Engineering - Concrete Technology - Discussion

47. 

Addition of pozzolana to cement

[A]. decreases workability
[B]. increases strength
[C]. increases heat of hydration
[D]. decreases curing time
[E]. none of these.

Answer: Option E

Explanation:

No answer description available for this question.

Madan Gorathoki said: (Jul 6, 2013)  
What is heat of hydration?

Sumit Patil said: (Sep 28, 2015)  
Please tell me answer of this question.

Arvind Singh Rathore said: (Oct 20, 2015)  
Answer should B. Because pozzolana have property of increasing strength, by reaction with cement.

Anuj Kumar said: (Nov 25, 2015)  
Increase setting time of cement so option E is correct.

Mohamed Moawad said: (Dec 27, 2015)  
Addition of pozzolana to cement make the following statement:

1. Increasing strength.

2. Delay setting of cement.

3. Decreasing heat of hydration (the reacting between cement and water).

4. Increasing durability and serviceability.

5. Decreasing porosity of concrete.

So; the choose number B is correct.

Rombo said: (Nov 6, 2016)  
Yes, b is the correct answer.

P.Uday Teja Reddy said: (Nov 13, 2016)  
Most of the bits are wrong.

Ca(OH)2 + pozzolana = C-S-H (Denser Gel).
There by increasing the Strength.

Abid said: (Nov 28, 2016)  
B is the correct option. I agree.

Azar said: (Nov 29, 2016)  
The strength of the concrete is increased, its density is increased.

Efflorescence is decreased.

The propensity for alkali-silica reaction (reaction with glass) is decreased or even virtually eliminated.

Amit said: (Dec 8, 2016)  
Pozzolana. Responsible for quick setting so option E.

Midhun Madhav said: (Mar 26, 2017)  
The increase in strength is in comparison to the ordinary cement. In case of Pozzolana Portland Cement, the rate of increase in strength is slower. It is therefore that it has the property of emitting less heat of hydration thereby reducing shrinkage cracks. At site it is advisable to use PPC instead of OPC if you have the advantage of time.

Prashant Dwivedi said: (Jun 3, 2017)  
Pozzolana Cement is a option of OPC cement It having near about similar strength as OPC but not greater than OPC. So option E correct.

Garry said: (Dec 2, 2017)  
Pozolonic cement increases strength but it has originally less quantity of cement (10 to 30%) so strength of OPC and pozzolona approx same.

Mohammad Davood said: (Mar 31, 2018)  
B is right option because pozzolanas react with cuso4 produced during hydration and increases hydration product.

Bhaskar said: (Jun 20, 2018)  
Addition of pozzolana to cement increase shrinkage and which is not in the option So option E should be the correct answer.

Lee said: (Dec 31, 2018)  
It increase the long term strength due to forming CSH which is stronger, and through better backing of concrete.

Prashant said: (Nov 4, 2019)  
It should option B.

By adding pozzolana to cement it will increase the strength.

Him said: (Aug 2, 2021)  
Pozzolana cement concrete.

-> Less heat of hydration.

-> Used in dams, thick structures, retaining walls, abutments, foundation etc where more concrete is to be placed.

-> Low strength for first 28 days. After 28 days it gains strength equals to OPC.

-> Responsible for ultimate strength.

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