Abstract
A laboratory investigation of the relationships between bitumen chemistry and low temperature behaviour of asphalt mixtures is described. Five bitumens from four sources (Venezuela, Saudi Arabia, Mexico, Russia) and three different mixture types (dense graded, stone mastic and porous asphalt) were studied. Chemical characteristics of the binders were measured using Thin Layer Chromatography (TLC) and Gel Permeation Chromatography (GPC). Low temperature properties of asphalt characterised by the fracture temperature were measured using Thermal Stress Restrained Specimen Test (TSRST). Statistically significant relations between chemical characteristics of bitumens and fracture temperature of asphalt specimens are presented, indicating that the bitumen chemistry may have a significant influence on the low temperature behaviour of asphalt pavements.
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