基于微观角度的老化沥青评价指标研究

Research on evaluation indexes of aged asphalt based on micro perspective

中文关键词: 道路工程  官能团  老化  温度循环老化箱  红外光谱扫描  沥青

英文关键词: road engineering  functional groups  aging  temperature cycle aging oven  infrared spectral scanning  asphalt

中文摘要:

      为了定量分析全过程老化中沥青官能团对于宏观技术指标的影响，采用温度循环老化箱对3种基质沥青及2种改性沥青开展短期与长期老化试验，并利用Varian 600-IR型傅里叶变换红外光谱仪分析其官能团化学特性．通过模拟不同老化条件，结合多维度光谱学检测技术，系统解析了沥青材料老化过程中分子结构演变规律，筛选并推荐适用于评价沥青老化程度的微观评价指标，并运用SPSS统计软件建立微观评价指标与基本技术指标及流变特性指标的相关性．研究表明:羰基峰面积较亚砜基峰面积更能有效表征沥青老化微观特性．在基质沥青体系中，羰基峰面积与基本技术指标及流变特性指标均呈显著相关(R2>0.9)，而改性沥青旋转黏度与羰基峰面积的关联性较弱．分析表明羰基峰面积可作为评估沥青老化微观结构演化的有效指标．

英文摘要:

      In order to quantitatively analyze the influence of asphalt functional groups on macro-technical indexes during the whole aging process, a temperature cycle aging oven is used to carry out short-term and long-term aging tests on three types of matrix asphalt and two types of modified asphalt, and the chemical characteristics of the asphalt functional groups are analyzed by using the Varian 600-IR Fourier transform infrared spectrometer. By simulating different aging conditions and combining with multi-dimensional spectroscopy detection technology, the molecular structure evolution of asphalt materials in the aging process is systematically analyzed, and the microscopic evaluation indexes suitable for evaluating the aging degree of asphalt are screened and recommended, and the correlation between the microscopic evaluation indexes and the basic technical indexes and rheological property index is established by using the SPSS statistical software. The study confirms that the carbonyl peak area is more effective than the sulfoxide peak area in characterizing the aging micro-characteristics of asphalt. In the matrix asphalt system, carbonyl peak area shows a significant correlation (R2>0.9) with both the basic technical indexes and rheological property index, while the correlation between the rotational viscosity of modified asphalt and carbonyl peak area is weak. The analyses show that carbonyl peak area can be used as an effective index to assess the microstructural evolution of asphalt aging.