基于热分析质谱联用技术的沥青老化机理研究

发布时间：2018-03-30 19:46

  本文选题：道路工程　切入点：沥青　出处：《长安大学学报(自然科学版)》2014年06期

【摘要】：利用热分析质谱联用技术研究不同老化状态的沥青微观组成、结构与宏观路用性能之间的联系。首先制备沥青结合料短期老化和长期老化试样,然后采用热重-差热分析-质谱联用技术,分析不同老化状态沥青的热性质及逸出物质结构。研究结果表明:基质沥青、短期老化和长期老化的沥青试样分解过程的温度范围及峰值对应温度基本一致;低于300℃的温度范围内,试样老化程度对热重损失速率影响较小;沥青高温分解阶段,长期老化质量损失速率最低,基质沥青最高,短期老化试样居中;3种老化状态的沥青试样热分解产物主要有CO、H2O、CH4、CO2,该产物主要来源于沥青中大分子烷烃的高温分解和碳元素氧化;热重曲线残留质量比与沥青复数模量有较好的联系,随着沥青老化程度增大,TG曲线上残留质量比逐渐增加,在宏观上表现为复数模量增大。
[Abstract]:The relationship between microstructure, structure and macroscopical performance of asphalt in different aging states was studied by thermal analysis mass spectrometry. First, the short-term aging and long-term aging samples of asphalt binder were prepared. Then thermogravimetric differential thermal analysis-mass spectrometry was used to analyze the thermal properties and escape structure of asphalt in different aging states. The temperature range and peak corresponding temperature of the decomposition process of the asphalt samples aged in the short and long term are basically the same; in the temperature range below 300 鈩，

本文编号：1687376