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Rheological behavior of mortars under different squeezing rates / Fábio A. Cardoso in Cement and concrete research, Vol. 39 N° 9 (Septembre 2009) 

Public ISBD [article]  in Cement and concrete research > Vol. 39 N° 9 (Septembre 2009) . - pp. 748–753 Titre : Rheological behavior of mortars under different squeezing rates Type de document : texte imprimé Auteurs : Fábio A. Cardoso, Auteur ; M. John Vanderley, Auteur ; Rafael G. Pileggi, Auteur Année de publication : 2009 Article en page(s) : pp. 748–753 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Rheology  Mortar  Squeeze  flow Résumé : In the present work the squeeze flow technique was used to evaluate the rheological behavior of cement-based mortars containing macroscopic aggregates up to 1.2 mm. Compositions with different water and air contents were tested at three squeezing rates (0.01, 0.1 and 1 mm/s) 15 and 60 min after mixing. The mortars prepared with low (13 wt.%) and usual water content (15 wt.%) presented opposite behaviors as a function of elapsed time and squeezing speed. The first lost its cohesion with time and required higher loads when squeezed faster, while the latter became stiffer with time and was more difficult to be squeezed slowly as a result of phase segregation. Due to the increase of air content, the effects of this compressible phase became more significant and a more complex behavior was observed. Rheological properties such as elongational viscosity and yield stress were also determined. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S000888460900129X [article] Rheological behavior of mortars under different squeezing rates [texte imprimé] / Fábio A. Cardoso, Auteur ; M. John Vanderley, Auteur ; Rafael G. Pileggi, Auteur . - 2009 . - pp. 748–753. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 9 (Septembre 2009) . - pp. 748–753 Mots-clés : Rheology  Mortar  Squeeze  flow Résumé : In the present work the squeeze flow technique was used to evaluate the rheological behavior of cement-based mortars containing macroscopic aggregates up to 1.2 mm. Compositions with different water and air contents were tested at three squeezing rates (0.01, 0.1 and 1 mm/s) 15 and 60 min after mixing. The mortars prepared with low (13 wt.%) and usual water content (15 wt.%) presented opposite behaviors as a function of elapsed time and squeezing speed. The first lost its cohesion with time and required higher loads when squeezed faster, while the latter became stiffer with time and was more difficult to be squeezed slowly as a result of phase segregation. Due to the increase of air content, the effects of this compressible phase became more significant and a more complex behavior was observed. Rheological properties such as elongational viscosity and yield stress were also determined. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S000888460900129X