Ma Yuetan, Wang Shifeng, Zhang Miaomiao, Jiang Xi, Polaczyk Pawel, Huang Baoshan
Department of Civil and Environmental Engineering, The University of Tennessee, Knoxville, TN 37996, USA.
Department of Polymer Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Sci Total Environ. 2023 Mar 20;865:161089. doi: 10.1016/j.scitotenv.2022.161089. Epub 2022 Dec 29.
Weather aging may cause more severe degradation on asphalt than thermal-oxidative aging due to the synergistic effect among oxygen, heat, ultraviolet (UV) radiation, and moisture. This study aimed to investigate weather aging effects and anti-aging mechanisms on asphalt modified with rubber-polyethylene (PE) composites. The modified binder blends and asphalt mixtures were subjected to outdoor weather aging. Dynamic shear rheometer (DSR), Fourier transform infrared spectroscopy (FTIR), Gel permeation chromatography (GPC), and optical microscopy tests were adopted to characterize the rheological properties, aging resistance, polymer degradation, and anti-aging mechanisms of modified binder blends, respectively. Mixture performance tests including Asphalt Pavement Analyzer (APA) and Ideal-CT tests were used to evaluate rutting and cracking resistance of asphalt mixtures. Results showed that weather aging can cause more severe aging to asphalt binders than pressure aging vessel (PAV) due to the severe degradation of PE particles. Rubber-PE composites alloyed with an extruder proved to stabilize PE particles in asphalt and significantly improve the aging resistance of modified binder blends. The enhanced aging resistance is attributed to the dispersion of PE particles and carbon black released by soluble rubbers.
由于氧气、热量、紫外线（UV）辐射和水分之间的协同作用，气候老化可能会导致沥青的降解比热氧化老化更严重。本研究旨在探究橡胶-聚乙烯（PE）复合材料改性沥青的气候老化效应和抗老化机理。对改性粘结剂共混物和沥青混合料进行户外气候老化试验。分别采用动态剪切流变仪（DSR）、傅里叶变换红外光谱仪（FTIR）、凝胶渗透色谱仪（GPC）和光学显微镜试验来表征改性粘结剂共混物的流变性能、抗老化性能、聚合物降解情况和抗老化机理。采用包括沥青路面分析仪（APA）和理想-CT试验在内的混合料性能试验来评估沥青混合料的抗车辙和抗裂性能。结果表明，由于PE颗粒的严重降解，气候老化对沥青粘结剂造成的老化比压力老化容器（PAV）更严重。经挤出机合金化的橡胶-PE复合材料可使PE颗粒在沥青中稳定，并显著提高改性粘结剂共混物的抗老化性能。抗老化性能的提高归因于PE颗粒的分散以及可溶性橡胶释放的炭黑。
