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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。
Atomic Force Microscopy (AFM) was used to explore the law of asphalt aging, and compared with the traditional research results of Fourier Transform Infrared Spectroscopy (FTIR). The microstructural properties and chemical functional groups of the asphalts and SBS modified asphalts after being aged (unaged), aged by RTFO and aged by PAV were tested respectively. The results show that the higher the degree of asphalt aging, “Bee structure ” the better the development, the greater the average area and the largest area. There are at least three different micro-domains in asphalt samples with different adhesion, among which “Bee Structure” has the lowest adhesion. Aging affects the nanomechanical properties of asphalt and improves the uniformity of the size distribution of asphalt adhesion. The adhesion of SBS modified asphalt with different aging degrees is greater than that of matrix asphalt. Aging causes the content of oxygen-containing functional groups such as bitumen carbonyl and sulfoxide groups to increase but the content of butadienyl groups to decrease. The microscopic mechanical changes after asphalt aging have a good relationship with the changes of functional groups.