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Structural change of bitumen in the recycling process by using rheology and NMR / Luigi Filippelli in Industrial & engineering chemistry research, Vol. 51 N° 50 (Décembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 50 (Décembre 2012) Titre : Structural change of bitumen in the recycling process by using rheology and NMR Type de document : texte imprimé Auteurs : Luigi Filippelli, Auteur ; Luigi Gentile, Auteur ; Cesare Oliviero Rossi, Auteur Année de publication : 2013 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Rheology Résumé : The mechanical properties of bitumen are the result of the chemical composition and arrangement of the molecular structures (phases present). The loss of elasticity of the bitumen with aging is mainly due to the oxidation of aromatic compounds and resins. This work deals with the recycling process of bitumen, by following the changes in the bitumen structure. Fresh, aged, and doped recycled bitumens were investigated. Rheology and nuclear magnetic resonance were used to monitor the differences between the bitumens and the role of the additives. As a novel approach to the understanding of the colloidal nature of the bitumen, an inverse Laplace transform of the NMR spin-echo decay (T2) was applied. The results indicate that the rejuvenating additives have little influence on the solid–liquid transition. However, they help to restructure the aged bitumen, thus facilitating workability at a lower temperature. Two-dimensional maps of the structure distributions were reconstructed. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301899v [article] Structural change of bitumen in the recycling process by using rheology and NMR [texte imprimé] / Luigi Filippelli, Auteur ; Luigi Gentile, Auteur ; Cesare Oliviero Rossi, Auteur . - 2013. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 50 (Décembre 2012) Mots-clés : Rheology Résumé : The mechanical properties of bitumen are the result of the chemical composition and arrangement of the molecular structures (phases present). The loss of elasticity of the bitumen with aging is mainly due to the oxidation of aromatic compounds and resins. This work deals with the recycling process of bitumen, by following the changes in the bitumen structure. Fresh, aged, and doped recycled bitumens were investigated. Rheology and nuclear magnetic resonance were used to monitor the differences between the bitumens and the role of the additives. As a novel approach to the understanding of the colloidal nature of the bitumen, an inverse Laplace transform of the NMR spin-echo decay (T2) was applied. The results indicate that the rejuvenating additives have little influence on the solid–liquid transition. However, they help to restructure the aged bitumen, thus facilitating workability at a lower temperature. Two-dimensional maps of the structure distributions were reconstructed. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301899v