Civil Engineering (CE) Exam > Civil Engineering (CE) Questions > Consider the following statements:Entrainment...
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Consider the following statements:
Entrainment of air in concrete is done so as to
1. Increase the workability
2. Increase the strength
3. Increase the resistance to freezing and thawing
Which of these statements is/are correct?
- a)1, 2 and 3
- b)1 only
- c)1 and 3 only
- d)3 only
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
Consider the following statements:Entrainment of air in concrete is do...
Air entrained concrete has effects on the compressive strength of concrete and its workability. Air entrained concrete increases the workability of concrete without much increase in the water-cement ratio.
To maintain the desired compressive strength and workability of concrete together, generally, in the case of higher strength concrete, admixtures are used. Air entraining agent is one such concrete admixture to increase the workability without affecting much reduction in compressive strength.
Most Upvoted Answer
Consider the following statements:Entrainment of air in concrete is do...
Entrainment of air in concrete is done so as to increase the workability and resistance to freezing and thawing. It does not directly increase the strength of concrete.
1. Increase the workability:
- When air is entrained in concrete, it creates small air bubbles throughout the mixture. These air bubbles act as lubricants, making the concrete more fluid and easier to work with.
- The increased workability allows for better placement, compaction, and finishing of the concrete, reducing the need for excessive water content and excessive vibration.
- This in turn improves the overall quality and durability of the concrete structure.
2. Increase the strength:
- Contrary to the statement, entrained air does not directly increase the strength of concrete.
- In fact, excessive air entrainment can lead to a decrease in compressive strength.
- However, it is important to note that air entrainment can indirectly contribute to the overall strength of concrete by improving its durability and resistance to cracking and deterioration.
3. Increase the resistance to freezing and thawing:
- This is one of the main reasons why air entrainment is done in concrete.
- When water in concrete freezes, it expands, exerting pressure on the surrounding matrix.
- If there is no room for expansion, the pressure can cause the concrete to crack and deteriorate.
- By entraining air, the expansion of freezing water is accommodated by the air voids, reducing the potential for damage.
- The air voids act as relief points and prevent the internal pressure from causing extensive cracking.
- This increases the resistance of concrete to freeze-thaw cycles and enhances its overall durability.
In conclusion, the correct statements are:
1. Entrainment of air in concrete is done to increase the workability.
3. Entrainment of air in concrete is done to increase the resistance to freezing and thawing.
Therefore, option C is the correct answer.
1. Increase the workability:
- When air is entrained in concrete, it creates small air bubbles throughout the mixture. These air bubbles act as lubricants, making the concrete more fluid and easier to work with.
- The increased workability allows for better placement, compaction, and finishing of the concrete, reducing the need for excessive water content and excessive vibration.
- This in turn improves the overall quality and durability of the concrete structure.
2. Increase the strength:
- Contrary to the statement, entrained air does not directly increase the strength of concrete.
- In fact, excessive air entrainment can lead to a decrease in compressive strength.
- However, it is important to note that air entrainment can indirectly contribute to the overall strength of concrete by improving its durability and resistance to cracking and deterioration.
3. Increase the resistance to freezing and thawing:
- This is one of the main reasons why air entrainment is done in concrete.
- When water in concrete freezes, it expands, exerting pressure on the surrounding matrix.
- If there is no room for expansion, the pressure can cause the concrete to crack and deteriorate.
- By entraining air, the expansion of freezing water is accommodated by the air voids, reducing the potential for damage.
- The air voids act as relief points and prevent the internal pressure from causing extensive cracking.
- This increases the resistance of concrete to freeze-thaw cycles and enhances its overall durability.
In conclusion, the correct statements are:
1. Entrainment of air in concrete is done to increase the workability.
3. Entrainment of air in concrete is done to increase the resistance to freezing and thawing.
Therefore, option C is the correct answer.
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Consider the following statements:Entrainment of air in concrete is done so as to1. Increase the workability2. Increase the strength3. Increase the resistance to freezing and thawingWhich of these statements is/are correct?a)1, 2 and 3b)1 onlyc)1 and 3 onlyd)3 onlyCorrect answer is option 'C'. Can you explain this answer?
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