found: Work cat.: Whiting, D. Control of air content in concrete, 1983.
found: TEST.
found: ASTI:p. 329, under Concrete--Air entrainment.
found: LC data base, 10/26/83.
found: Portland Cement Assoc. web site, viewed Apr. 4, 2019Air-entrained Concrete (Air-entrained concrete contains billions of microscopic air cells per cubic foot. These air pockets relieve internal pressure on the concrete by providing tiny chambers for water to expand into when it freezes) Finishing Air-entrained Concrete (The primary use of air-entraining concrete is for freeze-thaw resistance. The air voids provide pressure relief sites during a freeze event, allowing the water inside the concrete to freeze without inducing large internal stresses. Another related use is for deicer-scaling resistance. The air voids again provide relief sites for the buildup of salt concentrations and the pressures that result due to concentration gradients. Other uses of air-entrained concrete include sulfate resistance, resistance to alkali-silica reactivity, and improved workability)
