Evaluating the ageing degrees of bitumen by rheological and chemical indices

The ageing of bitumen is an inevitable phenomenon which still challenging to be characterised. This paper aims at evaluating the degrees comprehensively. There were six types being aged five levels for comparing purposes and multiple rheological tests by a DSR as well chemical test SARA (saturates, aromatics, resins asphaltenes) properties carried out. critical temperatures, G-R parameter nonrecoverable-compliance-based indices proposed evaluate in terms low-, intermediate- high-temperature performance bitumen, respectively. Also, novel evaluation index based on integration modulus master curves was employed modified, can accurately whole range temperature. Finally, analysed confirmed have strong linear relationship with bitumen.