[1235] BALL-BEARING EFFECT OF FLY ASH FOR HIGHER FINE AGGREGATE CONTENT IN SELF-COMPACTING CONCRETE
キーワード：ball-bearing effect, compressive strength., fine aggregate content, fly ash, self-compactability, self-compacting concrete, water retention
The effect of fly ash on self-compactability of fresh concrete for increasing fine aggregate content (s/m) in self-compacting concrete (SCC) was investigated. Both reduction in water retention and ball-bearing effect of fly ash were considered as the influence of the replacement of cement with fly ash. Higher s/m in SCC can be employed as fly ash replacement ratio (fa/p) increases owing to the higher ball-bearing effect of fly ash, in spite of reduction in water to powder ratio (w/p). Besides, with certain fa/p and reduction in w/p, decrease in 28 days compressive strength tended to be mitigated.