Air-entrained concrete Air-entrained concrete contains millions of tiny, intentionally formed air bubbles that improve its resistance to freeze-thaw cycles. These microscopic air pockets help reduce damage caused by expanding ice.
In climates that experience freezing temperatures, air-entrained concrete provides better durability by allowing water inside the concrete to expand without creating excessive internal pressure. This reduces cracking, scaling, and surface deterioration over time. Air entrainment is achieved through specialized admixtures added during batching rather than by introducing ordinary trapped air.
Frequently Asked Questions About Air-entrained concrete
What is air-entrained concrete?
Concrete containing millions of intentionally formed microscopic air bubbles that improve resistance to freeze-thaw damage.
How do the air bubbles help?
They give water inside the concrete room to expand as it freezes, relieving internal pressure that would otherwise cause cracking and surface scaling.
Is it necessary in New York?
Yes, for exterior concrete. The region's repeated freeze-thaw cycles make air entrainment important for sidewalk durability.
How is air entrainment achieved?
Through specialized admixtures added during batching, not by ordinary trapped air from mixing.