Abstract
This report presents the results of a study of entrained air in portland cement concrete. It contains a review of previous research and experience on air entrainment, a tabulation of current specifications, identification of field problems in control of air content, results of laboratory investigations involving low-slump concrete, and guidelines for control of entrained air during mixing and placing of concrete. The report will be of special interest to materials engineers, specification writers, researchers, and others interested in the production and placement of air-entrained concrete that will likely be subjected to freeze-thaw cycles or deicing chemicals. (Author).