| 温拌再生沥青胶结料二次老化性能 |
| |
| 引用本文： | 李强,陆杨,王家庆,孙光旭,赵曜.温拌再生沥青胶结料二次老化性能[J].交通运输工程学报,2022,22(4):102-116. |
| |
| 作者姓名： | 李强 陆杨 王家庆 孙光旭 赵曜 |
| |
| 作者单位： | 1.南京林业大学 土木工程学院，江苏 南京 2100372.华设设计集团股份有限公司，江苏 南京 210005 |
| |
| 基金项目： | 国家自然科学基金项目52108408江苏省科技项目BK20181404江苏省科技项目BK20210617江苏省产学研合作项目BY2021313 |
| |
| 摘 要： | 为研究温拌再生沥青胶结料的二次老化性能，以2种常用温拌剂为基础，考虑再生剂与不同改性剂复杂耦合作用，提出3种不同的再生方案；基于动态剪切流变试验，分析3种不同温拌再生方案下的沥青胶结料在二次老化前后、不同二次老化程度下的黏弹性能、抗车辙性能及抗疲劳性能的变化规律，通过傅里叶红外光谱试验和环境扫描电镜试验分析了不同温拌再生方案下沥青胶结料表面化学官能团及其微观结构的变化规律。研究结果表明:Sasobit温拌剂较大程度提高了再生沥青胶结料在二次老化后的弹性特征及抗车辙性能，但其疲劳寿命在5%应变水平及二次老化作用下小于10 000次；Evotherm 3G与SBR胶乳及胶粉的结合在一定程度提升了再生沥青胶结料在二次老化后的高温性能，且保留了原有的低温性能，其与SBR胶乳的结合呈现出最佳的黏弹性能，而其与胶粉的结合呈现的不可恢复蠕变柔量在二次老化后仍小于0.05，展现出极佳的抗车辙性能；微观化学物理特性分析结果揭示了不同再生方案下的二次老化机理，其化学官能团及微观结构表征的变化规律与动态流变剪切特性的变化规律呈现出较好的相关性。
|
| 关 键 词： | 路面工程 温拌再生沥青 动态剪切流变 二次老化 胶粉 微观结构 |
| 收稿时间： | 2022-03-09 |
Secondary aging performance of warm-mix recycled asphalt binder |
| |
| LI Qiang,LU Yang,WANG Jia-qing,SUN Guang-xu,ZHAO Yao.Secondary aging performance of warm-mix recycled asphalt binder[J].Journal of Traffic and Transportation Engineering,2022,22(4):102-116. |
| |
| Authors: | LI Qiang LU Yang WANG Jia-qing SUN Guang-xu ZHAO Yao |
| |
| Affiliation: | 1.College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, Jiangsu, China2.China Design Group Co., Ltd., Nanjing 210005, Jiangsu, China |
| |
| Abstract: | In order to investigate the secondary aging performance of warm-mix recycled asphalt binder, three different recycling schemes were proposed on the basis of two commonly used warm agents and considering the complex coupling effects of regenerants and different modifiers. By the dynamic shear rheological test, the change laws of viscoelasticity performance, rutting resistance performance, and fatigue resistance performance of asphalt binder were analyzed by using the three different warm-mix recycling schemes before and after secondary aging and under different secondary aging degrees. The change laws of surface chemical functional groups and microstructures of asphalt binder under different warm-mix recycling schemes were analyzed by the Fourier transform Infrared and environmental scanning electron microscopy (ESEM) test. Analysis results indicate that the elastic characteristics and rutting resistance performance of recycled asphalt binder after secondary aging are greatly improved by the warm agent Sasobit, but its fatigue life is less than 10 000 under the strain level of 5% and secondary aging. With the combination of Evotherm 3G with SBR latex and rubber powder, the high-temperature performance of recycled asphalt binder after secondary aging is promoted to some extent, and the original low-temperature performance is maintained. Under the combination of Evotherm 3G with SBR latex, the optimal viscoelastic performance is presented, while under the combination of Evotherm 3G with rubber powder, the irrecoverable creep compliance is still less than 0.05 after secondary aging, and excellent rutting resistance performance is shown. The secondary aging mechanisms under different recycling schemes are revealed by the analysis results of microchemical and microphysical properties, and the change laws of chemical functional groups and microstructure characteristics are well correlated with the change laws of dynamic shear rheological properties. |
| |
| Keywords: | |
|
| 点击此处可从《交通运输工程学报》浏览原始摘要信息 |
|
点击此处可从《交通运输工程学报》下载全文 |
|
