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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Stabilized Air Void System in Superplasticized Concrete
Author(s): K. Baekmark, H. Hansen, and J. Reichart
Publication: Special Publication
Appears on pages(s): 177-190
Keywords: air-entraining agents; air entrainment; durability; slump; specific surface; stability; superplasticizers; water-reducing agents; Materials Research
Abstract:The fact that a stable air-void system in concrete enhances its durability is well documented today. In Denmark, for example, all concrete to be used for exterior components is air-entrained. The main problem is to insure the stability of the air-void system in the concrete, independent of mixing time, transportation, consistency, fines content, and type of plasticizer or superplasticizer. A new type of air-entrainer has been developed that provides excellent performance in concrete containing a melamine sulfonate-type of superplasticizer. The concrete has a slump of more than 150 mm, and even after 60 min of transportation and pumping, the air-void content and air-void structure are still satisfactory. The air-entrainer is a combination of special surfactants chosen after a long series of tests. Carrying out such a range of tests within the short time available was possible only because of newly developed testing equipment, which made it possible to measure air content and air-void system parameters within 30 min while the concrete was still fresh. Results of the testing, in accordance with ASTM C 457, are presented.
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