基于红外光谱的新-旧沥青界面相溶性研究  

Miscibility of New-Old Asphalt Interface Based on Infrared Spectroscopy

作　　者：张敏 ZHANG Min(Shanxi Transportation Construction Engineering Quality Detection Center(Co.,Ltd.),Taiyuan,Shanxi 030032,China)

机构地区：[1]山西省交通建设工程质量检测中心(有限公司),山西太原030032

出　　处：《山西交通科技》2024年第1期19-22,共4页Shanxi Science & Technology of Transportation

摘　　要：新-旧沥青界面相溶性直接影响再生沥青混合料的路用性能。通过红外光谱技术,对新沥青和旧沥青的化学光能团进行对比分析,提出可用于表征沥青老化程度的特征官能团;采用“分层脱洗法”对再生混合料中RAP颗粒表面的沥青膜进行精细分离,测定沥青膜不同厚度范围内特征官能团相对含量,定量分析了新-旧沥青界面的相溶性。结果表明:新沥青与旧沥青的红外光谱图存在明显差异性;羰基C=O(1700 cm^(-1))、亚砜基S=O(1035 cm^(-1))可作为评价沥青老化程度的特征官能团;羰基指数CI与亚砜基指数SI可作为新-旧沥青界面相溶性的评价指标,新-旧沥青界面相溶性符合“部分混溶”假设。研究成果对再生沥青混合料材料设计、性能调控具有一定的参考意义。The miscibility of new-old asphalt interface directly affects the road performance of recycled asphalt mixtures.In this paper,the chemical functional groups of new and old asphalt were compared and analyzed by infrared spectroscopy to identify the characteristic functional groups that can be used to assess the level of asphalt aging.The asphalt film on the surface of RAP particles in the recycled mixture was finely separated by the"layered detergent method",and the relative content of characteristic functional groups in different thicknesses of the film was determined.The interfacial miscibility of new-old asphalt was quantitatively analyzed.The results showed that the infrared spectra of the new asphalt and the old asphalt were significantly different.Carbonyl C=O(1700 cm^(-1))and sulfoxide S=O(1035 cm^(-1))could be used as characteristic functional groups to assess the level of asphalt aging.The carbonyl index CI and sulfoxide index SI could be used as the evaluation index of new-old asphalt interfacial miscibility following the"partial miscibility"assumption.The research results provide a certain reference for the material design and performance control of recycled asphalt mixtures.

关 键 词：新-旧沥青 界面相溶性 红外光谱 沥青老化 

分 类 号：U414.75[交通运输工程—道路与铁道工程]