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Bitumen chemical foaming for asphalt paving applications / Virginia Carrera in Industrial & engineering chemistry research, Vol. 49 N° 18 (Septembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8538–8543 Titre : Bitumen chemical foaming for asphalt paving applications Type de document : texte imprimé Auteurs : Virginia Carrera, Auteur ; Moises Garcia-Morales, Auteur ; Francisco J. Navarro, Auteur Année de publication : 2010 Article en page(s) : pp. 8538–8543 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Bitumen  chemical Résumé : As an alternative to traditional hot-mix asphalt paving, bitumen foaming technologies have been extensively used in road recycling over the last decades. However, much more work on the use of foam-enhancing chemical agents is needed. This research deals with the influence that temperature and processing protocol exert on the bitumen foaming process promoted by a poly(propylene glycol) functionalized with a polymeric 4,4′-diphenylmethane diisocyanate. Likewise, rheological and microstructural characterizations have been carried out on the modified bituminous residues obtained after foaming. From the experimental results obtained, it may be concluded that reactive isocyanate-based polymers can be used to obtain foamed binders with different foamability and stability characteristics. On the other hand, both foaming and bitumen modification are seen to occur simultaneously, as a result of bitumen/polymer reactions involving water. Finally, dynamic shear tests and atomic force microscopy observations reveal very different degrees of modification, which depend on the colloidal features of the as-received bitumen. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101136f [article] Bitumen chemical foaming for asphalt paving applications [texte imprimé] / Virginia Carrera, Auteur ; Moises Garcia-Morales, Auteur ; Francisco J. Navarro, Auteur . - 2010 . - pp. 8538–8543. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8538–8543 Mots-clés : Bitumen  chemical Résumé : As an alternative to traditional hot-mix asphalt paving, bitumen foaming technologies have been extensively used in road recycling over the last decades. However, much more work on the use of foam-enhancing chemical agents is needed. This research deals with the influence that temperature and processing protocol exert on the bitumen foaming process promoted by a poly(propylene glycol) functionalized with a polymeric 4,4′-diphenylmethane diisocyanate. Likewise, rheological and microstructural characterizations have been carried out on the modified bituminous residues obtained after foaming. From the experimental results obtained, it may be concluded that reactive isocyanate-based polymers can be used to obtain foamed binders with different foamability and stability characteristics. On the other hand, both foaming and bitumen modification are seen to occur simultaneously, as a result of bitumen/polymer reactions involving water. Finally, dynamic shear tests and atomic force microscopy observations reveal very different degrees of modification, which depend on the colloidal features of the as-received bitumen. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101136f

Influence of bitumen colloidal nature on the design of isocyanate-based bituminous products with enhanced rheological properties / Virginia Carrera in Industrial & engineering chemistry research, Vol. 48 N° 18 (Septembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8464–8470 Titre : Influence of bitumen colloidal nature on the design of isocyanate-based bituminous products with enhanced rheological properties Type de document : texte imprimé Auteurs : Virginia Carrera, Auteur ; Pedro Partal, Auteur ; Moises Garcia-Morales, Auteur Année de publication : 2010 Article en page(s) : pp. 8464–8470 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Bitumen  colloidal  nature  Rheological  propertiesIsocyanate-based  reactive  polymers Résumé : This work deals with the influence that bitumen colloidal nature exerts on the rheological properties of bitumen samples modified by isocyanate-based reactive polymers. Shear rheology tests, modulated differential scanning calorimetry (MDSC), chemical characterization by TLC-FID, and AFM microstructural analysis were carried out on four different 150/200 penetration neat bitumen samples and the corresponding MDI-PPG (a low molecular weight polypropylene glycol functionalized with a polymeric 4,4′-diphenylmethane diisocyanate) modified binders. The results obtained demonstrate that the bitumen modification degree depends on bitumen reactivity and microstructure. Thus, the highest modification capability is obtained with neat bitumen samples that exhibit both a well-developed three-dimensional network and a high chemical reactivity with the isocyanate groups. The results obtained may be used to improve the performance of these materials, according to their final application. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9004404 [article] Influence of bitumen colloidal nature on the design of isocyanate-based bituminous products with enhanced rheological properties [texte imprimé] / Virginia Carrera, Auteur ; Pedro Partal, Auteur ; Moises Garcia-Morales, Auteur . - 2010 . - pp. 8464–8470. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8464–8470 Mots-clés : Bitumen  colloidal  nature  Rheological  propertiesIsocyanate-based  reactive  polymers Résumé : This work deals with the influence that bitumen colloidal nature exerts on the rheological properties of bitumen samples modified by isocyanate-based reactive polymers. Shear rheology tests, modulated differential scanning calorimetry (MDSC), chemical characterization by TLC-FID, and AFM microstructural analysis were carried out on four different 150/200 penetration neat bitumen samples and the corresponding MDI-PPG (a low molecular weight polypropylene glycol functionalized with a polymeric 4,4′-diphenylmethane diisocyanate) modified binders. The results obtained demonstrate that the bitumen modification degree depends on bitumen reactivity and microstructure. Thus, the highest modification capability is obtained with neat bitumen samples that exhibit both a well-developed three-dimensional network and a high chemical reactivity with the isocyanate groups. The results obtained may be used to improve the performance of these materials, according to their final application. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9004404