废食用油/新沥青复合再生混合料路用性能研究

Research on Road Performance of Rejuvenated Mixture with Waste Cooking Oil and Virgin Asphalt

为研究废食用油及新沥青对废旧混合料再生性能的影响,利用浸水马歇尔、低温弯曲蠕变、高温车辙及四点弯曲疲劳寿命等实验,分析再生沥青混合料的路用性能;结合棒状薄层色谱及热裂解气象色谱分析,研究再生沥青化学组成的变化.结果表明,废食用油与新沥青的添加能提高老化沥青中轻质油分含量、降低沥青质含量,使胶体结构趋向溶胶型;复合再生剂的添加能改善老化混合料的低温性能、水稳定性能及疲劳性能,但对其高温性能改善效果有限.

In order to evaluate the regeneration effect of waste cooking oil and virgin asphalt on recycled asphalt pavement（RAP）,the road performance of rejuvenated mixture were analyzed by experiments such as immersion Marshall,low-temperature bending creep,high-temperature rutting and four-point bending fatigue life.The thin layer chromatography and Pyrolysis Gas Chromatograph-Mass Spectrometer-computer（Py-GC/MS）analysis were carried out to investigate the chemical compositions and microstructure of rejuvenated asphalt.The results indicate that the addition of WCO and virgin asphalt can improve the content of SARA（saturates,aromatics,resins and asphaltenes）fractions of aged asphalt,resulting in the colloid structure tending to sol type.Moreover,the low-temperature performance,water stability and fatigue resistance properties of aged asphalt mixture are improved due to the addition of complex regenerant,while the high-temperature stability performance remains to be further improved.