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Thermal behavior of asphalt cements

Thermochimica Acta
Publication Date
DOI: 10.1016/s0040-6031(98)00537-1
  • Analysis
  • Asphalt Cements
  • Glass Transition
  • Liquid–Liquid Demixtion
  • Relaxation


Abstract Asphalt cements are highly complex mixtures of hydrocarbon molecules whose thermal behavior is of prime importance for petroleum and road industry. From DSC, the determination of several thermal properties of asphalts is given, e.g. glass-transition temperature and crystallized fraction content. The dissolution of a pure n-paraffin C n H 2 n+2 in an asphalt, as seen by DSC, should be a single peak. For 20< n<32 two peaks were observed. This means that their dissolution occurs in two liquids, and explains the usual shape of the DSC traces of AC, which shows a minimum at 35° to 40°C. At room temperature, an asphalt cement is a mixture of two liquids containing some crystallized fractions. Above 80°C, it appears as a single liquid phase. At low temperature, the study of the glasses formed was done, using either constant or variable heating rate DSC. This technique, shows two glass transitions, for an asphalt containing a high quantity of crystallized fractions. The T g of these glasses change with time and temperature. The formation of the crystallized phases is superposed to the enthalpic relaxation of the glasses, making a kinetic study very difficult.

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