【摘要】 利用红外光谱和凝胶色谱等技术考察了胜利 10 0B和韩国 70两种道路沥青热老化后族组成、羰基与亚砜官能团以及相对分子质量分布的变化。结果表明 :虽然韩国 70沥青的延展性好于胜利沥青 ,但其耐老化性并不好。依据试验数据认为道路沥青的老化是沥青本身缓慢的自氧化过程。氧化生成氢过氧化物 ,最终转化成含羰基与亚砜官能团的组分 ,氧化反应符合游离基链反应历程。氧化促使沥青中含极性官能团组分之间的缔合与缩合 ,形成新的沥青质组分 ,使沥青平均相对分子质量增加 ,性能变差。更多还原

【Abstract】 Changes of group-component, functional groups of carbonyl and sulfoxide and molecular weight distribution of Shengli 100B and South Korea 70 asphalts after ageing were investigated by IR spectra and gel permeation chromatograph. The result indicated that the anti-ageing ability of the South Korea70 was not good though its ductility was better than that of Shengli 100B. In addition, the aged mechanism was considered as follows: the oxidation of asphalt with air was a slow auto-oxidation reaction, hydroperoxide intermediate was formed during ageing ,and then it was turned into the components containing carbonyl and sulfoxide group. The ageing mechanism meets the free radical chain-reaction. The content of asphaltine increased during ageing because of the association and condensation among molecular agglomerates.更多还原