ABSTRACT

Reclaimed asphalt pavement (RAP) is the deteriorated pavement material, containing aged binder and aggregates. A rejuvenator is normally added to the mixture to reduce its stiffness, by blending with the aged binder and changing the properties of the mixture. Therefore, it is necessary to have an insight into the microstructure of the RAP and rejuvenated RAP. In this study, waste engine oil (WEO), waste vegetable oil (WVO) and waste grease (WG) are used as rejuvenators, at different dosages. The interaction between the rejuvenator and RAP is evaluated through microscopic analysis, Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) analysis. The microscopic analysis has provided the orientation and distribution of the aggregate, depicting the significant increase in coating of aged binder on the RAP with the increase in the rejuvenator dosage. The FTIR and XRD results have shown that rejuvenator has restored the asphaltenes and maltenes ratio and fluidity of the RAP. WG has comprehensively enhanced the asphaltenes and maltenes ratio, compared to the WEO and WVO. However, microscopic analysis suggests that the WG has high agglomeration. Overall, it is concluded that 6% WVO is a perfect dosage to enhance fluidity of the RAP.

摘要

再生沥青路面（RAP）是劣化的路面材料，含有老化的粘合剂和骨料。通常将再生剂添加到混合物中以降低其硬度，方法是与老化的粘合剂混合并改变混合物的性质。因此，有必要深入了解RAP和再生RAP的微观结构。在这项研究中，废机油（WEO）、废植物油（WVO）和废油脂（WG）被用作再生剂，剂量不同。通过显微分析、傅里叶变换红外 (FTIR) 光谱和 X 射线衍射 (XRD) 分析评估再生剂和 RAP 之间的相互作用。微观分析提供了骨料的取向和分布，描绘了随着再生剂剂量的增加，RAP 上老化粘合剂涂层的显着增加。FTIR和XRD结果表明再生剂恢复了RAP的沥青质和麦芽糖比例和流动性。与 WEO 和 WVO 相比，WG 全面提高了沥青质和麦芽糖的比例。然而，微观分析表明WG具有高度聚集性。总体而言，得出的结论是 6% WVO 是增强 RAP 流动性的完美剂量。