Air entrainment is the intentional creation of tiny air bubbles in concrete. The bubbles are introduced into the concrete by the addition to the mix of an air entraining agent, a surfactant (surface-active substance, a type of chemical that includes detergents).

1. The air entrainment process improves the workability of the concrete mix.
   摻氣過程改善了混凝土拌合物的可操作性。
2. Air entrainment is essential for concrete used in cold climates to prevent frost damage.
   摻氣對(duì)于在寒冷氣候中使用的混凝土至關(guān)重要，以防止凍害。
3. The contractor is focusing on entraining air properly to achieve the desired mix quality.
   承包商正在專注于適當(dāng)?shù)負(fù)饺肟諝?，以達(dá)到理想的混合質(zhì)量。
4. Proper air entrainment ensures the material will have better resistance to freeze-thaw cycles.
   適當(dāng)?shù)膿綒獯_保材料能夠更好地抵抗凍融循環(huán)。