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Consider the following statements: Low percentage of C3S and high percentage of C2S in cement will result in
1. higher ultimate strength with less heat generation
2. rapid-hardening
3. better resistance to chemical attack
Which of these statements are correct?
1. higher ultimate strength with less heat generation
2. rapid-hardening
3. better resistance to chemical attack
Which of these statements are correct?
- a)1 and 2
- b)2 and 3
- c)1 and 3
- d)1, 2 and 3
Correct answer is option 'C'. Can you explain this answer?
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Consider the following statements: Low percentage of C3S and high perc...
The correct answer is option C: 1 and 3.
1. Higher ultimate strength with less heat generation:
- The percentage of C3S (tricalcium silicate) in cement is directly related to its strength development. C3S is the main compound responsible for early strength gain in cement.
- On the other hand, C2S (dicalcium silicate) contributes to the long-term strength of cement.
- When the percentage of C3S is low and the percentage of C2S is high, the cement will have slower early strength development but higher long-term strength.
- This means that the ultimate strength of the cement will be higher, as it will continue to gain strength over a longer period of time.
- Additionally, less heat will be generated during the hydration process of the cement when the percentage of C3S is low. This can be beneficial in situations where heat generation needs to be minimized, such as in large mass concrete placements or in hot weather conditions.
3. Better resistance to chemical attack:
- The presence of C2S in cement contributes to better resistance against chemical attacks, such as from sulfates and acids.
- C2S reacts with water during the hydration process to form calcium silicate hydrate (CSH) gel, which acts as a protective layer around the cement particles.
- This CSH gel provides a barrier against chemical substances that may attack the cement, thus increasing its resistance to chemical deterioration.
- Therefore, a higher percentage of C2S in cement will result in better resistance to chemical attack.
In summary, a low percentage of C3S and a high percentage of C2S in cement will lead to higher ultimate strength with less heat generation and better resistance to chemical attack.
1. Higher ultimate strength with less heat generation:
- The percentage of C3S (tricalcium silicate) in cement is directly related to its strength development. C3S is the main compound responsible for early strength gain in cement.
- On the other hand, C2S (dicalcium silicate) contributes to the long-term strength of cement.
- When the percentage of C3S is low and the percentage of C2S is high, the cement will have slower early strength development but higher long-term strength.
- This means that the ultimate strength of the cement will be higher, as it will continue to gain strength over a longer period of time.
- Additionally, less heat will be generated during the hydration process of the cement when the percentage of C3S is low. This can be beneficial in situations where heat generation needs to be minimized, such as in large mass concrete placements or in hot weather conditions.
3. Better resistance to chemical attack:
- The presence of C2S in cement contributes to better resistance against chemical attacks, such as from sulfates and acids.
- C2S reacts with water during the hydration process to form calcium silicate hydrate (CSH) gel, which acts as a protective layer around the cement particles.
- This CSH gel provides a barrier against chemical substances that may attack the cement, thus increasing its resistance to chemical deterioration.
- Therefore, a higher percentage of C2S in cement will result in better resistance to chemical attack.
In summary, a low percentage of C3S and a high percentage of C2S in cement will lead to higher ultimate strength with less heat generation and better resistance to chemical attack.
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Consider the following statements: Low percentage of C3S and high percentage of C2S in cement will result in1. higher ultimate strength with less heat generation2. rapid-hardening3. better resistance to chemical attackWhich of these statements are correct?a)1 and 2b)2 and 3c)1 and 3d)1, 2 and 3Correct answer is option 'C'. Can you explain this answer?
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