Extended initial test for air-entrained concrete with superplasticizer under consideration of
practical construction conditions
E. Eickschen, C. Müller, VDZ gGmbH, Duesseldorf, Germany
There is as yet no recommendation for an extended initial test with the combined use of air-entraining agent and superplasticizer. Practical testing in advance based on realistic construction conditions could provide an early indication of adverse developments. A research project therefore examined whether the connections between mixing time, active agent and the amount of air-entraining agent added and the potential for later activation found for air-entrained concretes without superplasticizer (stiff consistency) apply to air-entrained concretes with superplasticizer as well. Amongst other things, this involved investigating the influence of the sequence in which the air-entraining agent and superplasticizer are added. The studies yielded fundamental findings relating to the operating mechanisms of air entrainment with the combined use of air-entraining agents and superplasticizers for production in the laboratory and in practice, as well as during transport. The tests revealed that commonly employed procedures for air-entrained concrete without superplasticizer can also be used for air-entrained concretes with superplasticizer and that they can be applied to practical conditions.
Summary CEMENT INTERNATIONAL 03/2019 pp 66-78
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