Assertion A: Pozzolana is added to cement to increase early strength.Reason R: It reduces the heat of hydration.Which of the following is correct?a)A is true but R is false.b)Both A and R are true, and R is the correct explanation of Ac)A is false but R is trued)Both A and R are true, but R is not a correct explanation of ACorrect answer is option 'C'. Can you explain this answer?

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Assertion A: Pozzolana is added to cement to increase early strength.
Reason R: It reduces the heat of hydration.
Which of the following is correct?

a)
A is true but R is false.
b)
Both A and R are true, and R is the correct explanation of A
c)
A is false but R is true
d)
Both A and R are true, but R is not a correct explanation of A

Correct answer is option 'C'. Can you explain this answer?

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Assertion A: Pozzolana is added to cement to increase early strength.R...

Pozzolana cement:

Pozzolanic cement is mixtures of Portland cement and a pozzolanic material that may be either natural or artificial. The natural pozzolanas are the main materials of volcanic origin but include some diatomaceous earth. Artificial materials include fly ash, burned clays, and shales.
It generates less heat of hydration than ordinary Portland cement.
It is economical as in PPC a part of the costly clinker of OPC is replaced by cheaper pozzolanic material.
Used in hydraulic structures, marine structures, construction near the seashore, dam construction etc.

To increase the early strength of cement, Tri-calcium silicate (C3S) is increased. Hence Pozzolona is not added to increase early strength.

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Assertion A: Pozzolana is added to cement to increase early strength.R...

Explanation:

Assertion A:
Pozzolana is added to cement to increase early strength. Pozzolana is a siliceous and aluminous material that can react with calcium hydroxide in the presence of water to form compounds possessing cementitious properties. When added to cement, pozzolana can accelerate the hydration process, leading to increased early strength development.

Reason R:
It reduces the heat of hydration. Pozzolanic materials like fly ash or silica fume can reduce the heat generated during the hydration of cement. This is particularly beneficial in large concrete placements where excessive heat can lead to thermal cracking. By reducing the heat of hydration, pozzolana helps in controlling temperature rise and mitigating the risk of thermal-related issues.

Therefore, statement A is false because the primary purpose of adding pozzolana to cement is to improve early strength development rather than reducing the heat of hydration. Statement R is true as pozzolana does indeed help in reducing the heat of hydration in cementitious systems.

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Assertion A: Pozzolana is added to cement to increase early strength.Reason R: It reduces the heat of hydration.Which of the following is correct?a)A is true but R is false.b)Both A and R are true, and R is the correct explanation of Ac)A is false but R is trued)Both A and R are true, but R is not a correct explanation of ACorrect answer is option 'C'. Can you explain this answer?

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