[article]
| Titre : |
Rheological characterization of asphalt bitumens modified with reactive polyurethanes |
| Type de document : |
texte imprimé |
| Auteurs : |
T. Barbosa, Auteur ; E. Baptista, Auteur ; J. Bordado, Auteur ; A. C. Diogo, Auteur |
| Année de publication : |
1998 |
| Article en page(s) : |
p. 527-532 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Bitume
Cisaillement (mécanique)
Dispersions et suspensions
Polyuréthanes
Relaxation des contraintes
Rhéologie
|
| Index. décimale : |
668 Technologie des autres produits organiques |
| Résumé : |
We present a comparative study of the influence of a new type of asphalt bitumen modifiers, reactive polyurethane modifiers, in the rheological properties of these materials. Reactive polyurethane modifiers are a new kind of asphalt bitumen modifiers, which are expected to enhance bitumen elasticity both through dissolution into the maltene phase, and by chemical binding to the asphaltene domains. Two modifiers were considered : a MDI-based polyurethane with a regid chain, and a star TDI-based polyurethane with three flexible arms. The chosen rheological tests were stress relaxation, dynamic shear and steady shear. Comparative testing based on the same 60/70 bitumen shows that both reactive polyurethane systems contribute to the stabilizatio of the dispersion. A positive contribution to the viscoelastic properties is also quite noticeable, namely on the elastic part of the shear modulus G'(w). |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36573 |
in LES CAHIERS DE RHEOLOGIE > Vol. XVI, N° 1 (10/1998) . - p. 527-532
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Rheological characterization of asphalt bitumens modified with reactive polyurethanes in LES CAHIERS DE RHEOLOGIE, Vol. XVI, N° 1 (10/1998)
