Question 9. What is air entrained concrete?

Air-entrained concrete is ordinary concrete that contains controlled amounts of air in the form of microscopic bubbles. These intentionally entrained air bubbles are extremely small.  This creates many tiny air pockets in the concrete. These air pockets ease internal strain and pressure on the concrete by allowing water a place to expand when it freezes. The amount of air we use in the mix varies, but is typically between 4 percent and 8 percent. The primary benefit of entrained air in hardened concrete is the resistance it offers to scaling caused by de-icing salts or chemicals and freeze-thaw damage.