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Observations of air-bubbles escaped from fresh cement paste / M. Tyler Ley in Cement and concrete research, Vol. 39 N° 5 (Mai 2009) 

Public ISBD [article]  in Cement and concrete research > Vol. 39 N° 5 (Mai 2009) . - pp. 409–416 Titre : Observations of air-bubbles escaped from fresh cement paste Type de document : texte imprimé Auteurs : M. Tyler Ley, Auteur ; Kevin J. Folliard, Auteur ; Kenneth C. Hover, Auteur Année de publication : 2009 Article en page(s) : pp. 409–416 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Freezing  and  thawing  ;  Admixture  ;  Fresh  concrete  ;  Air  entrainment Résumé : 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 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000428 [article] Observations of air-bubbles escaped from fresh cement paste [texte imprimé] / M. Tyler Ley, Auteur ; Kevin J. Folliard, Auteur ; Kenneth C. Hover, Auteur . - 2009 . - pp. 409–416. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 5 (Mai 2009) . - pp. 409–416 Mots-clés : Freezing  and  thawing  ;  Admixture  ;  Fresh  concrete  ;  Air  entrainment Résumé : 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 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000428

The physical and chemical characteristics of the shell of air-entrained bubbles in cement paste / M. Tyler Ley in Cement and concrete research, Vol. 39 N° 5 (Mai 2009) 

Public ISBD [article]  in Cement and concrete research > Vol. 39 N° 5 (Mai 2009) . - pp. 417–425 Titre : The physical and chemical characteristics of the shell of air-entrained bubbles in cement paste Type de document : texte imprimé Auteurs : M. Tyler Ley, Auteur ; Ryan T. Chancey, Auteur ; Maria C.G. Juenger, Auteur Année de publication : 2009 Article en page(s) : pp. 417–425 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Freezing  and  thawing  ;  Admixture  ;  Fresh  concrete  ;  Air  entrainment Résumé : Recent research has suggested that the shell of an air-entrained void is important for resisting coalescence between air-voids and diffusion of gas from the surrounding fluid. The current paper describes the physical and chemical properties of an air-void shell during the first 2 h of hydration and chemical characteristics at 60 days. Results from this research suggest that the air-void shells found in air-entrained paste have varied physical properties and the crystalline material of these shells is largely made up of fine cement particles during the first 2 h of hydration. Observations of paste at 60 days of hydration suggest that the shell is made up of calcium silicate hydrate (C–S–H) with a morphology different from that in the bulk paste. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000441 [article] The physical and chemical characteristics of the shell of air-entrained bubbles in cement paste [texte imprimé] / M. Tyler Ley, Auteur ; Ryan T. Chancey, Auteur ; Maria C.G. Juenger, Auteur . - 2009 . - pp. 417–425. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 5 (Mai 2009) . - pp. 417–425 Mots-clés : Freezing  and  thawing  ;  Admixture  ;  Fresh  concrete  ;  Air  entrainment Résumé : Recent research has suggested that the shell of an air-entrained void is important for resisting coalescence between air-voids and diffusion of gas from the surrounding fluid. The current paper describes the physical and chemical properties of an air-void shell during the first 2 h of hydration and chemical characteristics at 60 days. Results from this research suggest that the air-void shells found in air-entrained paste have varied physical properties and the crystalline material of these shells is largely made up of fine cement particles during the first 2 h of hydration. Observations of paste at 60 days of hydration suggest that the shell is made up of calcium silicate hydrate (C–S–H) with a morphology different from that in the bulk paste. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000441