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Air entrainment and concrete - USDA
www.nrcs.usda.govair entraining agents or of air en-t r aining cements. The former in-clude such products as natura l wood re s i n s , animal or ve g e t a b l e f a t s , wetting agents and water solu-ble soaps of certain acids. These are The laboratory specimen at the left with no entrained air was severely damaged in laboratory tests of salt scaling.