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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

Role of water in the development of new isocyanate-based bituminous products / Maria J. Martín-Alfonso in Industrial & engineering chemistry research, Vol. 47 N°18 (Septembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°18 (Septembre 2008) . - p. 6933–6940 Titre : Role of water in the development of new isocyanate-based bituminous products Type de document : texte imprimé Auteurs : Maria J. Martín-Alfonso, Auteur ; Pedro Partal, Auteur ; Francisco J. Navarro, Auteur Année de publication : 2008 Article en page(s) : p. 6933–6940 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Bituminous  membranes  MDI-PEG  reactive  polymer Résumé : Asphalt, roofing, and sealing markets strongly demand new materials for being used, for instance, as bituminous coating membranes. In that sense, this paper deals with the effect on these bitumen-based composites of the addition of a MDI-PEG reactive polymer, synthesized by the reaction of 4,4′-diphenylmethane diisocyanate with a low molecular weight poly(ethylene glycol). A short-term modification, taking place during mixing, and a long-term bitumen modification, which develops for a long period of curing (up to several months), have been identified. Both of them result from chemical reactions between NCO groups in the MDI-PEG and some of the bitumen compounds, mainly, the resin fraction. However, long-term bitumen modification seems to be related to the polymer−bitumen reactions but influenced by the environmental conditions (probably due to air moisture). This fact may be used to improve the manufacture of new materials with suitable properties according to their final application. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800243w [article] Role of water in the development of new isocyanate-based bituminous products [texte imprimé] / Maria J. Martín-Alfonso, Auteur ; Pedro Partal, Auteur ; Francisco J. Navarro, Auteur . - 2008 . - p. 6933–6940. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°18 (Septembre 2008) . - p. 6933–6940 Mots-clés : Bituminous  membranes  MDI-PEG  reactive  polymer Résumé : Asphalt, roofing, and sealing markets strongly demand new materials for being used, for instance, as bituminous coating membranes. In that sense, this paper deals with the effect on these bitumen-based composites of the addition of a MDI-PEG reactive polymer, synthesized by the reaction of 4,4′-diphenylmethane diisocyanate with a low molecular weight poly(ethylene glycol). A short-term modification, taking place during mixing, and a long-term bitumen modification, which develops for a long period of curing (up to several months), have been identified. Both of them result from chemical reactions between NCO groups in the MDI-PEG and some of the bitumen compounds, mainly, the resin fraction. However, long-term bitumen modification seems to be related to the polymer−bitumen reactions but influenced by the environmental conditions (probably due to air moisture). This fact may be used to improve the manufacture of new materials with suitable properties according to their final application. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800243w