What factors influence the air content of concrete in the plastic state?

Factors influencing air content of concrete in plastic state:

•  Batching sequence simultaneously will lower the air content of the concrete. It can be avoided by adding air entraining admixtures.
• Overloading during the mixture of concrete will increase the air content of the concrete.
•  Mixing time of concrete should not be greater or lower than 60 seconds.
• Belt conveyors used to move mixture from one place to another place will reduce the air content up to an average of 1%.
•  Air content will decrease in the surface due to excessive finishing.
• Air content will decreases when the temperature gets increased.
•  Vibration with high frequencies will decrease the air content.
• Pumping action also reduces air content with ranges from  to.
• Reduction in air during the transportation is also occurred.