基质沥青老化前后多尺度特性研究

Study on Multi-scale Characteristics of Matrix Asphalt before and after Aging

分别采用元素分析法与凝胶渗透色谱探究老化对基质沥青元素组成以及相对分子质量变化的影响,并采用动态剪切流变试验研究了老化对基质沥青宏观黏弹特性的影响,同时通过统计分析研究了基质沥青微观特性与宏观性能之间的联系.结果表明:老化会导致基质沥青内部氧元素含量大幅增加,并促使芳碳率与缩合指数提高,同时老化会促进基质沥青相对分子质量分布整体往大分子方向移动,重均相对分子质量得到显著提高;基质沥青微观特性与宏观性能之间具有良好的相关性,表明沥青的宏观性能是其微观特性在宏观层面的体现,而微观特性对其宏观路用性能具有直接影响.

Elemental analysis and gel permeation chromatography were utilized to investigate the effect of aging on asphalt element composition and molecular weight,and the dynamic shear rheological test was used to study the effect of aging on the viscoelastic properties of asphalt.Meanwhile,the statistical analysis was applied to study the relation between microscopic characteristics and macro-properties.The microscopic test results indicate that the aging can lead to significantly increase oxygen content in asphalt and promote an increase in carbon content and condensation index.And the aging can also promote the asphalt molecular weight distribution moving to the direction of macromolecules,the weight-average molecular weight is significantly increased.The correlation analysis shows that the microscopic properties has a good correlation with the macroscopic properties,it is indicated that the macroscopic properties of asphalt are the manifestations of microscopic characteristics at the macro aspect,and the microscopic characteristics have a direct impact on the macro-properties.