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Consider the following statements:
The effect of air entrainment in concrete is to
1. increase resistance to freezing and thawing
2. improve workability
3. decrease strength
Which of these statements are correct
- a)2 and 3
- b)1 and 3
- c)1 alone
- d)1, 2 and 3
Correct answer is option 'D'. Can you explain this answer?
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Consider the following statements:The effect of air entrainment in con...
Air Entrainment in Concrete
Air entrainment is the intentional introduction of microscopic air bubbles into concrete during mixing. These bubbles help to improve the durability of concrete by increasing its resistance to freezing and thawing cycles. Here are the statements and their explanations:
1. Increase Resistance to Freezing and Thawing
- Air entrainment helps to prevent damage caused by freeze-thaw cycles.
- As water freezes, it expands and creates pressure in the concrete. If there are no air voids in the concrete, this pressure can cause damage.
- The air voids created by air entrainment provide a space for the water to expand into, reducing the pressure and minimizing damage.
2. Improve Workability
- Air entrainment can also improve the workability of concrete.
- The air voids act as lubrication, making it easier to place and finish the concrete.
- This can be particularly helpful in situations where the concrete needs to be pumped or placed in hard-to-reach areas.
3. Decrease Strength
- It is true that air entrainment can slightly decrease the strength of concrete.
- This is because the air voids take up space that would otherwise be filled with solid concrete, reducing the overall density.
- However, the decrease in strength is typically minimal, and the benefits of improved durability outweigh this small reduction in strength.
In conclusion, all three statements are correct. Air entrainment can increase resistance to freezing and thawing, improve workability, and slightly decrease strength. Overall, the benefits of air entrainment make it a valuable addition to concrete in many situations.
Air entrainment is the intentional introduction of microscopic air bubbles into concrete during mixing. These bubbles help to improve the durability of concrete by increasing its resistance to freezing and thawing cycles. Here are the statements and their explanations:
1. Increase Resistance to Freezing and Thawing
- Air entrainment helps to prevent damage caused by freeze-thaw cycles.
- As water freezes, it expands and creates pressure in the concrete. If there are no air voids in the concrete, this pressure can cause damage.
- The air voids created by air entrainment provide a space for the water to expand into, reducing the pressure and minimizing damage.
2. Improve Workability
- Air entrainment can also improve the workability of concrete.
- The air voids act as lubrication, making it easier to place and finish the concrete.
- This can be particularly helpful in situations where the concrete needs to be pumped or placed in hard-to-reach areas.
3. Decrease Strength
- It is true that air entrainment can slightly decrease the strength of concrete.
- This is because the air voids take up space that would otherwise be filled with solid concrete, reducing the overall density.
- However, the decrease in strength is typically minimal, and the benefits of improved durability outweigh this small reduction in strength.
In conclusion, all three statements are correct. Air entrainment can increase resistance to freezing and thawing, improve workability, and slightly decrease strength. Overall, the benefits of air entrainment make it a valuable addition to concrete in many situations.
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Consider the following statements:The effect of air entrainment in concrete is to1. increase resistance to freezing and thawing2. improve workability3. decrease strengthWhich of these statements are correcta)2 and 3b)1 and 3c)1 aloned)1, 2 and 3Correct answer is option 'D'. Can you explain this answer?
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