Prosperi Emiliano, Bocci Edoardo, Marchegiani Giovanni
Dipartimento di Ingegneria Civile Edile e Architettura, Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy.
Department of Theoretical and Applied Sciences, Università degli Studi eCampus, 22060 Novedrate, Italy.
Materials (Basel). 2025 Aug 7;18(15):3713. doi: 10.3390/ma18153713.
Several variables influence the performance of hot asphalt mixtures including reclaimed asphalt pavement (RAP). Among these, the virgin bitumen's origin, the mix production temperature and the time the mix is kept at a high temperature between mixing and compaction play a fundamental role but are often neglected. This study aimed to quantify the negative effects associated with the improper choice of these variables. Therefore, their influence on the mechanical (indirect tensile stiffness modulus and strength, Cracking Tolerance Index) and chemical (Fourier Transform Infra-Red spectroscopy) characteristics of asphalt mixtures containing 50% RA were investigated. In particular, two rejuvenators, two types of virgin bitumen (visbreaker and straight-run), two production temperatures (140 °C and 170 °C) and three conditioning times in the oven (30 min, 90 min and 180 min) were analyzed. The results showed interesting findings that allow us to recommend selecting the virgin bitumen type carefully and to avoid excessively stressing the binder during the production of the mix.
包括再生沥青路面（RAP）在内的几个变量会影响热拌沥青混合料的性能。其中，原生沥青的来源、混合料生产温度以及混合料在搅拌和压实之间保持高温的时间起着至关重要的作用，但往往被忽视。本研究旨在量化与这些变量选择不当相关的负面影响。因此，研究了它们对含有50%再生料的沥青混合料的力学性能（间接拉伸劲度模量和强度、抗裂性指数）和化学性能（傅里叶变换红外光谱）的影响。具体而言，分析了两种再生剂、两种原生沥青类型（减粘裂化沥青和直馏沥青）、两种生产温度（140℃和170℃）以及在烘箱中的三种养护时间（30分钟、90分钟和180分钟）。结果显示了一些有趣的发现，使我们能够建议谨慎选择原生沥青类型，并避免在混合料生产过程中过度使粘结料受力。
