Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 128, Issue -, Pages 349-360Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2016.10.087
Keywords
Self-compacting concrete; Self-compactability; Fly ash; Ball-bearing effect; Water retention; Fine aggregate content.; Entrained air bubbles; Air-entraining agent
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An experimental study on the effect of entrained air bubbles on the enhancement of self-compactability in fresh concrete with high volume fly ash was investigated. The stability in terms of volume of entrained air bubbles was also analysed. In this paper, lower water retention and ball-bearing effect of fly ash and entrained air bubbles were considered to affect the self-compactability of fresh concrete. The results showed that higher fine aggregate content in mortar (s/m) of SCC can be employed as replacement ratio of cement with fly ash (fa/p) increases owing to the higher ball-bearing effect of fly ash, in spite of reduction in water to powder ratio (w/p). The ball-bearing effect of entrained air bubbles, with certain type of air-entraining agent (AEA), was also found to further enhance the self-compactability of fresh concrete with fly ash. However, the stability in volume of entrained air bubbles tended to be reduced as fa/p increased, due to higher amount of large entrained air bubbles produced. Apparently, the spherical shape of fly ash tended to cause the unification and escape of entrained air bubbles in SCC. (C) 2016 Elsevier Ltd. All rights reserved.
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