Abstract
Thirty-six concrete mixes were made using different admixture combinations and dosages (3 types of air-entraining agent and 3 types of water-reducer were used). Air void characteristics of the hardened concrete were measured on specimens of each mix cast after different mixing periods in order to study the production and the stability of the air void system (air content and spacing factor). Results clearly show that certain admixture combinations and dosages produce satisfactory air void systems (L<2000 μm and stable throughout mixing) whereas others seem to be incompatible. The use of double dosages of water-reducers was found to have a deleterious effect on the production and stability of the air void system. No correlation was noted between the spacing factor variations and air content variations with time.
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