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Rheology and microstructure of MDI-PEG reactive prepolymer-modified bitumen
This paper deals with the use of a new bitumen modifier, a reactive prepolymer, based on the reaction of 4,4'-diphenylmethane diisocyanate (MDI) and a low molecular weight polyethylene glycol (PEG). The rheological and thermal behaviours of modified bitumen containing a low MDI-PEG concentration, as well as its morphology, have been studied. A relatively low amount of MDI-PEG (0.5 to 1.5% wt.) yields a significant improvement in the modified bitumen rheological properties, mainly in the high in-service temperature region. In this range of temperature, the rheological properties are clearly affected by curing time at room temperature. These results indicate that chemical changes, due to the reaction of MDI isocyanate groups with the most polar groups (-OH; -NH) of asphaltenes and resins, are produced. Thus, new chemical structures, non-visible by optical microscopy, slowly develop in MDI-PEG modified bitumen when samples are cured at room temperature.
Rheology and microstructure of MDI-PEG reactive prepolymer-modified bitumen
This paper deals with the use of a new bitumen modifier, a reactive prepolymer, based on the reaction of 4,4'-diphenylmethane diisocyanate (MDI) and a low molecular weight polyethylene glycol (PEG). The rheological and thermal behaviours of modified bitumen containing a low MDI-PEG concentration, as well as its morphology, have been studied. A relatively low amount of MDI-PEG (0.5 to 1.5% wt.) yields a significant improvement in the modified bitumen rheological properties, mainly in the high in-service temperature region. In this range of temperature, the rheological properties are clearly affected by curing time at room temperature. These results indicate that chemical changes, due to the reaction of MDI isocyanate groups with the most polar groups (-OH; -NH) of asphaltenes and resins, are produced. Thus, new chemical structures, non-visible by optical microscopy, slowly develop in MDI-PEG modified bitumen when samples are cured at room temperature.
Rheology and microstructure of MDI-PEG reactive prepolymer-modified bitumen
Navarro, F.J. (author) / Partal, P. (author) / Martinez-Boza, F. (author) / Gallegos, C. (author) / Bordado, J.C.M. (author) / Diogo, A.C. (author)
Mechanics of Time-Dependent Materials ; 10 ; 347-359
2006
13 Seiten
Article (Journal)
English
Rheology of waste plastic fibre-modified bitumen
| Online Contents | 2011
Rheology of waste plastic fibre-modified bitumen
| Taylor & Francis Verlag | 2011