air entrainment

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.
   掺气过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.
   掺气对于在寒冷气候中使用的混凝土至关重要，以防止冻害。
3. The contractor is focusing on entraining air properly to achieve the desired mix quality.
   承包商正在专注于适当地掺入空气，以达到理想的混合质量。
4. Proper air entrainment ensures the material will have better resistance to freeze-thaw cycles.
   适当的掺气确保材料能够更好地抵抗冻融循环。