基于纳米力学和官能团的沥青老化微观机理

发布时间：2018-03-26 02:48

本文选题：道路工程　切入点：沥青老化　出处：《公路交通科技》2017年05期

【摘要】：采用原子力显微镜(Atomic Force Microscopy,AFM)技术来探索沥青老化规律,同时与传统的研究沥青老化方法傅里叶变换红外光谱(Fourier Transform infrared spectroscopy,FTIR)的研究结果进行比较。分别测试了基质沥青和SBS改性沥青在原状(未老化)、RTFO老化后和PAV老化后的微观力学特性及其官能团化学特性。结果表明,沥青的老化程度越高,"蜂状结构"发育越好,平均面积和最大面积越大。沥青试样内至少存在3个不同的微区具有不同的黏附力,其中"蜂状结构"相黏附力最低。老化影响沥青的纳米力学性能,提高沥青黏附力大小分布的均匀性,不同老化程度的SBS改性沥青的黏附力均大于基质沥青。老化引起沥青羰基和亚砜基等含氧官能团含量增加,丁二烯基含量减小。沥青老化后微观力学的变化与官能团的变化有良好关系。
[Abstract]:The atomic force microscope (AFM) technique is used to study the aging of asphalt. The results of Fourier transform infrared spectroscopy (FTIR) and SBS modified asphalt were compared with those of the traditional method for studying asphalt aging. The microstructures of the matrix asphalt and the SBS modified asphalt were measured after the aging of SBS and the aging of PAV. Observational mechanical properties and chemical properties of functional groups. The results show that, The higher the aging degree of asphalt, the better the development of "bee structure", the larger the average area and the maximum area. The adhesion force of "bee structure" phase is the lowest. Aging affects the nano-mechanical properties of asphalt and improves the uniformity of the distribution of adhesion force of asphalt. The adhesion of SBS modified asphalt with different aging degree was higher than that of base asphalt, and the content of oxygen functional groups such as carbonyl and sulfoxide increased after aging. The content of butadienyl decreases. The change of micromechanics of asphalt after aging has a good relationship with the change of functional groups.
【作者单位】：苏州科技大学道路工程研究中心;
【基金】：国家自然科学基金项目(51378328)
【分类号】：U414

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