Abstract—IR spectroscopy is used to assess the ease and depth of oxidation of roadmaking bitumen on the basis of the relative integral optical density of the carbonyl group’s absorption band during RTFOT and PAV tests. For different samples, the ease of short-term oxidation (the short-term oxidizability) of bitumen differs by an order of magnitude, while the difference in the long-term oxidizability is no more than 1.5-fold. The oxidation depth of different bitumen samples differs fivefold, with about 1.3-fold variation in aromatic content. The overall influence of increased oxidizability and oxidation depth of bitumen is established, in terms of increase in viscosity and softening temperature (ring and ball method) and decrease in penetration and extensibility.

摘要—基于RTFOT和PAV测试中羰基基团吸收带的相对积分光密度，IR光谱用于评估道路沥青的易氧化性和深度。对于不同的样品，沥青的短期氧化（短期氧化性）的难易程度相差一个数量级，而长期氧化性的差异不超过1.5倍。不同沥青样品的氧化深度相差五倍，芳烃含量变化约1.3倍。就增加粘度和软化温度（环和球法）以及降低渗透性和延伸性而言，确定了增加氧化性和沥青氧化深度的总体影响。