Fresh concrete Ⅱ / High-flowable concrete

[1234] EFFECT OF ENTRAINED AIR ON MITIGATION OF REDUCTION IN INTERACTION BETWEEN COARSE AGGREGATE AND MORTAR DURING DEFORMATION OF SELF-COMPACTING CONCRETE AT FRESH STAGE

Anuwat ATTACHAIYAWUTH¹, Masahiro OUCHI² (1.Kochi University of Technology 2.高知工科大学)

Keywords:air entraining agent., ball bearing effect, entrained air, fine aggregate content in mortar, interaction between coarse aggregate and mortar, self-compacting concrete

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Effect of entrained air on mitigation of interaction between coarse aggregate and mortar during deformation of self-compacting concrete at fresh stage was investigated. The mitigation in interaction between coarse aggregate and mortar by entrained air was classified into 2 types, which were effect of volumetric increase in paste and ball bearing effect. The index for interaction between coarse aggregate and mortar was the reduction rate in the funnel speed of mortar due to model coarse aggregate. Ball bearing effect was observed in mortar using only two types of air entraining agent and ball bearing effect depended on type of air entraining agent and fine aggregate content.