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Air Entrainment Meters (AIM 340, AIM 341, AIM 342) Ref Std :IS 1199/1079, BS 1881, EN 12350-7
Entrainment of a small amount of air in the cement/concrete has been found to improve considerably the durability of concrete. The recommended limits specified for the air content are between 3% and 6.5%. Smaller percentages may result in deterioration taking place more quickly and larger percentages may reduce the strength without any improvement in the durability of concrete.
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