Observations of air-bubbles escaped from fresh cement paste

Recent experimental work is presented using a new technique to observe bubbles that have escaped from cement pastes and suspended in the bleed water. These experiments suggest that the stability of an air-entrained bubble may be related to the integrity of the hydration shell. This paper also review...

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Veröffentlicht in:	Cement and concrete research 2009-05, Vol.39 (5), p.409-416
Hauptverfasser:	Ley, M. Tyler, Folliard, Kevin J., Hover, Kenneth C.
Format:	Artikel
Sprache:	eng
Schlagworte:	Admixture (D) Air entrainment Applied sciences Buildings. Public works Cement concrete constituents Cements Concretes. Mortars. Grouts Exact sciences and technology Freezing and thawing (C) Fresh concrete (A) Materials Properties and performance of fresh concrete Properties and test methods Properties of anhydrous and hydrated cement, test methods
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Beschreibung
Zusammenfassung:	Recent experimental work is presented using a new technique to observe bubbles that have escaped from cement pastes and suspended in the bleed water. These experiments suggest that the stability of an air-entrained bubble may be related to the integrity of the hydration shell. This paper also reviews literature dealing with changes to air bubbles with time in fresh air entrained cement paste and concrete and to the existence of a shell surrounding these bubbles.
ISSN:	0008-8846 1873-3948
DOI:	10.1016/j.cemconres.2009.01.019