Question

What is the definition of air-entrained concrete?

1) Concrete that will have resistance to freeze - thaw conditions when exposed to water and de-icing conditions
2) Concrete that has little resistance to freezing conditions
3) Concrete that is used on interior of the buildings only
4) Concrete that does not needs to troweled

Answer 1

Air-entrained concrete is a type of concrete that contains microscopic air bubbles throughout its structure. It improves resistance to freeze-thaw cycles and de-icing conditions, making it suitable for use in cold climates. The air bubbles provide space for water to expand when it freezes, reducing the risk of cracking.

Step-by-step explanation:

Air-entrained concrete is a type of concrete that contains microscopic air bubbles throughout its structure. These air bubbles are created by adding an air-entraining admixture to the concrete mixture during the mixing process. The purpose of air-entrained concrete is to improve its resistance to freeze-thaw cycles and de-icing conditions.

This type of concrete is commonly used in cold climates where the concrete is exposed to freezing temperatures and moisture. The microscopic air bubbles provide space for water to expand when it freezes, reducing the risk of cracking and damage to the concrete.

In contrast, ordinary concrete without air entrainment has little resistance to freezing conditions and can be prone to cracking when exposed to freeze-thaw cycles.