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Effect of fibre morphology on flocculation of fibre–cement suspensions / G.H.D. Tonoli in Cement and concrete research, Vol. 39 N° 11 (Novembre 2009) 

Public ISBD [article]  in Cement and concrete research > Vol. 39 N° 11 (Novembre 2009) . - pp. 1017–1022 Titre : Effect of fibre morphology on flocculation of fibre–cement suspensions Type de document : texte imprimé Auteurs : G.H.D. Tonoli, Auteur ; E. Fuente, Auteur ; C. Monte, Auteur Année de publication : 2010 Article en page(s) : pp. 1017–1022 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : ispersion  ;  Physical  properties  ;Fibre  reinforcement  ;Composite  ;  FBRM Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : The objective of the present research was to evaluate the effect of fibre morphology (e.g., length, width, fibrillation, broken ends, content of fines and number of fibres per gram) on flocculation and drainage properties of fibre–cement suspensions and on physical properties of the fibre–cement composites. Mechanical refining was used to change the morphological properties of Eucalyptus and Pinus pulps. Results show that the mechanical refining increased the size of the formed flocs and decreased the concentration of free small particles (with dimensions between 1 and 20 µm) as a consequence of the increased fibrillation and content of fines, which increased the capacity of the fibres to capture the mineral particles. High levels of refining were necessary for Pinus pulp to obtain cement retention values similar to those obtained by unrefined Eucalyptus pulp. This is due to the higher number of fibres per gram in Eucalyptus pulp than in Pinus pulp. Pulp refining improved the packing of the particles and, although decreased the drainage rate, it contributed to a less porous structure, which improved the microstructure of the composite. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001707 [article] Effect of fibre morphology on flocculation of fibre–cement suspensions [texte imprimé] / G.H.D. Tonoli, Auteur ; E. Fuente, Auteur ; C. Monte, Auteur . - 2010 . - pp. 1017–1022. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 11 (Novembre 2009) . - pp. 1017–1022 Mots-clés : ispersion  ;  Physical  properties  ;Fibre  reinforcement  ;Composite  ;  FBRM Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : The objective of the present research was to evaluate the effect of fibre morphology (e.g., length, width, fibrillation, broken ends, content of fines and number of fibres per gram) on flocculation and drainage properties of fibre–cement suspensions and on physical properties of the fibre–cement composites. Mechanical refining was used to change the morphological properties of Eucalyptus and Pinus pulps. Results show that the mechanical refining increased the size of the formed flocs and decreased the concentration of free small particles (with dimensions between 1 and 20 µm) as a consequence of the increased fibrillation and content of fines, which increased the capacity of the fibres to capture the mineral particles. High levels of refining were necessary for Pinus pulp to obtain cement retention values similar to those obtained by unrefined Eucalyptus pulp. This is due to the higher number of fibres per gram in Eucalyptus pulp than in Pinus pulp. Pulp refining improved the packing of the particles and, although decreased the drainage rate, it contributed to a less porous structure, which improved the microstructure of the composite. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001707