Final answer:
Air-entrainment is a process of incorporating tiny air bubbles into concrete to improve its durability and freeze-thaw resistance. The acceptable range of total air content in air-entrained concrete is typically between 4% to 8%.
Step-by-step explanation:
In the context of concrete, air-entrainment refers to the process of incorporating tiny air bubbles into the concrete mixture. This is done to improve the durability and freeze-thaw resistance of the concrete.
Total air content, also known as air void content, is typically specified as a percentage range.
The acceptable range of total air content in air-entrained concrete is usually between 4% to 8%.
For example, if a specification states that concrete shall be air-entrained with a total air content range of 4% to 8%, it means that the mixture should have an air void content within that specified percentage range.