Effect of Artificial Ageing on Two Different Bitumen of Different Origin but Same Performance Grade
Performance grade system for bitumen characterization is used to ensure that the selected bitumen has the required properties for the environmental conditions found in-situ. However, it has been shown that within a given PG grade, the properties can differ thru time. In this study the rheological characteristics evaluated with a DSR and a BBR are compared with the chemical composition of two different bitumen produced from different crude oil but with the same PG grade. The results have shown that even if both bitumens performs similarly with the usual ageing, RTFO and PAV, their characteristics get more different with intensive artificial laboratory ageing. The chemical characteristics of the bitumens were measured with infrared spectroscopy. It was shown that the change of their chemical composition with ageing is different. The links between their rheological properties and their chemical characteristics measured with FTIR that have been found is different for both bitumens.