| Autor: |
Such C, Eiadlani A, Buisine J. M |
| Rok vydání: |
1992 |
| Předmět: |
|
| Zdroj: |
Fuel Science and Technology International. 10:835-853 |
| ISSN: |
0884-3759 |
| DOI: |
10.1080/08843759208916024 |
| Popis: |
Thermodynamic behaviour of bitumens - three fresh, one oxydative aged - relative to two different penetration classes, has been studied by isobaric calorimetry and isochoric thermobarometry to lay down caracterisation criteria of bitumens from transformation temperatures. The thermiobarograms are analysed in terms of phases transitions; and compared to thermograms. A Pressure - Temperature phase diagram is determined for each bitumen. Five transformations are observed on the usual temperature range. The transition that occurs at lower temperature seems to be glass type ; generaly, the other transformations are attended with weak enthalpy changes. For the Van der Waals state equation applied to bitumens, the free volumes are determined from the slopes of thermobarograms. Transformations temperatures under atmospheric pressure are always higher for soft bitumens than for harder ones. It occurs that aging increases transformations temperatures. Thermobarometrk analysis of a fresh bitumen show that a... |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
