不同再生剂对再生沥青混合料抗老化性能影响研究

STUDY ON THE EFFECT OF DIFFERENT REJUVENATORS ON THE AGING RESISTANCE OF RECLAIMED ASPHALT PAVEMENT(RAP)MIXTURES

由于RAP材料中存在的硬质老化沥青导致其抗疲劳和抗开裂性能差。为弥补这些缺点,采取不同种类的再生剂来恢复老化沥青的性能。然而,RAP材料中的再生沥青对二次老化的抵抗力可能较低。在研究中将油基和有机再生剂用于含有50%RAP材料的沥青混合料中,对短期和长期老化的混合料进行弹性模量、动态蠕变、间接拉伸疲劳和中温断裂试验来研究混合料的老化性能。研究结果表明,再生剂类型对再生沥青混合料的耐老化性有很大影响,含有有机再生剂的混合料比含有油基再生剂的混合料更容易老化。

Due to the presence of hard,aged asphalt in RAP(Reclaimed Asphalt Pavement)materials,their resis-tance to fatigue and cracking is poor.To address these shortcomings,different types of rejuvenators are used to re-store the performance of aged asphalt.However,the rejuvenated asphalt in RAP materials may have lower resistance to secondary aging.In this study,oil-based and organic rejuvenators were applied to asphalt mixtures containing 50%RAP.The mixtures were subjected to short-term and long-term aging tests,including elastic modulus,dynamic creep,indirect tensile fatigue,and intermediate temperature fracture tests,to investigate their aging performance.The results indicate that the type of rejuvenator has a significant impact on the aging resistance of rejuvenated asphalt mixtures,with mixtures containing organic rejuvenators aging more rapidly than those with oil-based rejuvenators.