The Influence of Mineral Aggregates on Bitumen Ageing

10.6135/ijprt.org.tw/2014.7(2).115

Jian-Tao Wu；Wei-Peng Han；Gordon Airey；Nur Izzi Md. Yusoff

Ageing ； Bitumen ； DSR ； IFSM ； Mineral aggregate ； Oxidation ； Stiffness

International Journal of Pavement Research and Technology

7卷2期（2014 / 03 / 01）

115 - 123

英文

A typical basic aggregate (limestone) and a typical acidic aggregate (granite) were mixed with a 100/150 penetration grade bitumen and its 'short-term' aged equivalent to produce four different 28mm dense bitumen macadam (DBM) asphalt mixtures. Subsets of the four asphalt mixtures were also subjected to the SHRP short- and long-term ageing protocols to further age the different mixtures. The ageing properties of these asphalt mixtures, together with their recovered binders, were tested at the different ageing stages using stiffness modulus (ITSM) and complex modulus (DSR) tests respectively. The results from the ITSM and DSR tests were used to indirectly and directly assess the influence of mineral aggregates on bitumen ageing (short-term initial and long-term extended). The testing results show that both the binder and aggregate types can significantly affect the ageing properties of bituminous materials. In addition, it is found that the mineral aggregate can also influence the proportion of ageing amount at different ageing stages.