The present study was meant to investigate aging behavior of different SBS content modified asphalt pre and post aging. The conventional, rheological properties, chemical structure of aged matrix and SBS modified asphalt at various degrees were tested in this study. Principle component analysis (PCA) was used to eliminate the mutual influence between the evaluation indicators. Partial Least Squares method (PLS) was used to build model for predicting aging behaviors of SBS modified asphalt. Drawing the results of experimental tests and statistical analysis, main conclusions are as follows: Carbonyl groups of matrix and different SBS modified asphalt increased obviously with fatty side chain decreased during aging process according to X-ray photoelectron spectroscopy (XPS) results and Proton nuclear magnetic resonance tests (H-NMR). According to carbonyl and sulfoxide index results of the Fourier Transform Infrared Spectroscopy (FTIR) analysis, rheological and conventional properties aging index results, SBS modified asphalt (4.5% SBS addition) (SBS 4.5 for short) showed lower high-performance and anti-aging properties than SBS modified asphalt (3.0% SBS addition) (SBS 3.0 for short) after the RTFOT and PAV aging. Based on PCA results, properties peak [email protected] cm⁻¹, carbonyl index I_CO, viscosity modulus G″ and penetration distinguished most in asphalt aging behaviors. The PLS aging simulation model had good robustness for predicting the physical and rheological properties changes during the SBS modified asphalt aging process. From measurement IR analysis data, the expected rheological property δ can be predicted through PLS model best with correlation coefficient >0.90.

本研究旨在研究不同SBS含量的改性沥青老化前后的老化行为。本研究测试了不同程度的传统，流变性能，老化基体和SBS改性沥青的化学结构。主成分分析（PCA）用于消除评估指标之间的相互影响。采用偏最小二乘法（PLS）建立了预测SBS改性沥青老化行为的模型。根据实验结果和统计分析结果，主要结论如下：根据X射线光电子能谱（XPS）和质子核磁分析，基质和不同SBS改性沥青的羰基在老化过程中明显增加，而脂肪侧链减少。共振测试（H-NMR）。根据傅立叶变换红外光谱（FTIR）分析的羰基和亚砜指数结果，流变和常规性能老化指数结果，SBS改性沥青（添加4.5％SBS）（简称SBS 4.5）显示出较低的高性能和抗老化性在RTFOT和PAV老化后，其性能比SBS改性沥青（添加3.0％SBS）（简称SBS 3.0）要好。根据PCA结果，属性达到峰值[受电子邮件保护] cm^-1，羰基指数I _{C O}，粘度模量G''和渗透率在沥青老化行为中最为突出。PLS老化模拟模型具有很好的鲁棒性，可以预测SBS改性沥青老化过程中的物理和流变性能变化。从测量的IR分析数据，可以通过PLS模型以相关系数> 0.90最好地预测预期的流变性质δ。