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Air entrainment in the concrete increases
- a)workability
- b)strength
- c)the effects of temperature variations
- d)the unit weight
Correct answer is option 'A'. Can you explain this answer?
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Air entrainment in the concrete increasesa)workabilityb)strengthc)the ...
Air entrainment is the intentional creation of tiny air bubbles in concrete. The air bubbles are created during mixing of the plastic (easy flowing) concrete, and most of them survive to be part of the hardened concrete. The primary purpose of air entrainment is to increase the durability of the hardened concrete, especially in climates subject to freeze-thaw; the secondary purpose is to increase workability of the concrete while in a plastic state. Air entrained concrete increases the workability of concrete without much increase in water-cement ratio.
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Air entrainment in the concrete increasesa)workabilityb)strengthc)the ...
Workability:
When air is entrained in concrete, it creates tiny air bubbles throughout the mixture. These air bubbles act as lubricants, making the concrete more workable. This increased workability allows for easier placement, compaction, and finishing of the concrete.
Strength:
Contrary to popular belief, air entrainment actually improves the strength of concrete. The air bubbles act as pressure relief points, allowing the concrete to expand and contract without cracking under freeze-thaw cycles. This helps to enhance the durability and long-term strength of the concrete.
The effects of temperature variations:
Air entrainment in concrete helps to mitigate the effects of temperature variations on the material. The presence of air bubbles allows the concrete to expand and contract without causing cracking. This is particularly important in regions with extreme temperature fluctuations, where non-air-entrained concrete would be more prone to damage.
Unit weight:
Although air entrainment increases the volume of the concrete, it does not significantly impact the unit weight. The density of air is much lower than that of the concrete mixture, so the overall weight of the air-entrained concrete remains relatively unchanged.
When air is entrained in concrete, it creates tiny air bubbles throughout the mixture. These air bubbles act as lubricants, making the concrete more workable. This increased workability allows for easier placement, compaction, and finishing of the concrete.
Strength:
Contrary to popular belief, air entrainment actually improves the strength of concrete. The air bubbles act as pressure relief points, allowing the concrete to expand and contract without cracking under freeze-thaw cycles. This helps to enhance the durability and long-term strength of the concrete.
The effects of temperature variations:
Air entrainment in concrete helps to mitigate the effects of temperature variations on the material. The presence of air bubbles allows the concrete to expand and contract without causing cracking. This is particularly important in regions with extreme temperature fluctuations, where non-air-entrained concrete would be more prone to damage.
Unit weight:
Although air entrainment increases the volume of the concrete, it does not significantly impact the unit weight. The density of air is much lower than that of the concrete mixture, so the overall weight of the air-entrained concrete remains relatively unchanged.
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Air entrainment in the concrete increasesa)workabilityb)strengthc)the effects of temperature variationsd)the unit weightCorrect answer is option 'A'. Can you explain this answer?
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Air entrainment in the concrete increasesa)workabilityb)strengthc)the effects of temperature variationsd)the unit weightCorrect answer is option 'A'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about Air entrainment in the concrete increasesa)workabilityb)strengthc)the effects of temperature variationsd)the unit weightCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Air entrainment in the concrete increasesa)workabilityb)strengthc)the effects of temperature variationsd)the unit weightCorrect answer is option 'A'. Can you explain this answer?.
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