Based on attenuated total reflection Fourier-transform infrared (ATR-FTIR) spectroscopy and principal component analysis (PCA), four kinds of asphalt (two kinds of matrix asphalts, TPC70# and JL70# and two kinds of modified asphalts, SBS-1 and SBS-2) were aged using the rolling thin-film oven test (RTFOT). The multiple stress repeated creep recovery test (MSCR) was carried out on an AR1500ex dynamic shear rheometer (DSR). The PCA was carried out on the attenuated total reflection infrared spectrum of a pretreated aged asphalt, the principal component factors (oxidation factor and component change factor) were determined, the comprehensive index F was calculated, and a prediction model of aging time history was established and verified. A prediction model for the aging asphalt recovery rate R was established based on the functional group index. The relationship between the recovery rate R and aging time history of each aging asphalt was analyzed and the fatigue life of each aging asphalt based on the rate of dissipated energy change (RDEC) was compared. The correlation between the comprehensive index F and fatigue life of asphalt was also analyzed. The results show that the order of resistance to the high-temperature deformation of each aging asphalt is as follows: SBS-2 > SBS-1 > TPC70# > JL70#; the prediction model of aging asphalt recovery rate R based on functional group index has good reliability. Taking the loading cycle corresponding to the sudden increase of the inflection point of the curve, i.e., the fatigue life N_RDEC, as the evaluation index, the fatigue life order of each aging asphalt is SBS-1 > SBS-2 > JL70# > TPC70#. There is a positive correlation between the fatigue life of aged asphalt and the comprehensive index F of asphalt. The correlation degree R² is 0.85; i.e., with the increase of the comprehensive index F of asphalt, its fatigue life also increases. It was found that it is feasible to analyze the aging time history and fatigue life of asphalt by infrared spectroscopy, and it can provide a rapid and non-destructive prediction method for the practical engineering application of asphalt.

中文翻译：

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红外光谱法在沥青老化时间历史和疲劳寿命预测中的应用

基于衰减全反射傅立叶变换红外（ATR-FTIR）光谱和主成分分析（PCA），四种沥青（两种基质沥青TPC70＃和JL70＃以及两种改性沥青SBS-1和使用滚动薄膜烘箱测试（RTFOT）对SBS-2）进行时效处理。在AR1500ex动态剪切流变仪（DSR）上进行了多次应力重复蠕变恢复测试（MSCR）。在预处理的老化沥青的衰减全反射红外光谱上进行PCA，确定主要成分因子（氧化因子和成分变化因子），计算综合指数F，建立老化时间历史预测模型并验证。老化沥青回收率R的预测模型根据功能组索引建立。分析了每种老化沥青的回收率R与老化时间历史之间的关系，并根据耗散能量变化率（RDEC）比较了每种老化沥青的疲劳寿命。分析了沥青的综合指标F与疲劳寿命之间的关系。结果表明，每种老化沥青对高温变形的抵抗顺序为：SBS-2> SBS-1> TPC70＃> JL70＃；基于官能团指数的老化沥青采收率R的预测模型具有良好的可靠性。取对应于曲线拐点突然增加的加载周期，即疲劳寿命N _RDEC作为评估指标，每种老化沥青的疲劳寿命顺序为SBS-1> SBS-2> JL70＃> TPC70＃。老化沥青的疲劳寿命与沥青综合指数F呈正相关。相关度R ²为0.85。即，随着沥青综合指数F的增加，其疲劳寿命也增加。研究发现，利用红外光谱分析沥青的老化历史和疲劳寿命是可行的，可以为沥青的实际工程应用提供一种快速，无损的预测方法。