The presence of entrained air in concrete results in
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Explanation:
entrainment is the process where many small air bubbles are distibuted into concrete and become part of the matrix that binds the aggregate together in the hardened concrete.
These air bubbles are dispersed throughout the hardened cement paste but are not, by definition, part of the paste (Dolch 1984). Air entrainment has now been an accepted fact in concrete technology for more than 45 years.
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The presence of entrained air in concrete results in dictating its compressive strength.
Explanation:
- When cement paste is made for concrete, through a gradual process of mixing or introducing air entraining agents, it is ensured that air bubbles are entrained in it.
- These bubbles serve as reservoirs or expansion chambers for water when it freezes. This releases the internal pressure on the concrete.
- The entrained air is maintained at 4-7% but can vary depending on the purpose of use and area of use of the concrete.
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