Addition in suitable doses causes air to be incorporated in the form of minute bubbles in the concrete or mortar during mixing, usually to increase workability and resistance to freezing and thawing and disruptive action of deicing salts. A.E.A. when used in proper amounts increases the resistance of hardened concrete to freezing and thawing and normally at the same time improves the workability of fresh concrete. The entrained air makes the fresh concrete more cohesive and bleeding is also reduced.
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