The use of recycled concrete aggregate (RCA) as a part of coarse aggregates in asphalt pavements confers economic and environmental benefits. Coarse RCA (CRCA) has inferior mechanical and physical properties compared to natural aggregates due to very porous and weakly adhered cement mortar. In this study, CRCA surfaces were coated with waste plastic bottles (WPB) and used at 15%, 30%, and 50% in the asphalt concrete. The Marshall, stiffness modulus, and dynamic creep tests were performed to determine the strength of hot mix asphalts against rutting. The results revealed that the use of untreated CRCA reduced the Marshall quotient and the rutting resistance of the asphalt concrete. The results of the stiffness modulus and dynamic creep tests indicated that CRCA incorporation increased permanent deformation in the tested specimens due to the reduction of asphalt concrete stiffness. However, the asphalt concrete containing treated CRCA had lower permanent deformation because WPB promotes CRCA stability by penetrating its void and reinforcing cement mortar. Furthermore, by raising the temperature, the strength of all asphalt concretes decreased against rutting, and the reduction rate was higher in the modified specimens.

中文翻译：

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废塑料瓶包覆粗再生混凝土热拌沥青的抗车辙性能

在沥青路面中使用再生混凝土骨料 (RCA) 作为粗骨料的一部分可带来经济和环境效益。与天然骨料相比，粗 RCA (CRCA) 具有较差的机械和物理性能，这是由于水泥砂浆非常多孔且附着力较弱。在这项研究中，CRCA 表面涂有废塑料瓶 (WPB)，并在沥青混凝土中分别使用 15%、30% 和 50%。进行马歇尔、刚度模量和动态蠕变试验以确定热混沥青抗车辙的强度。结果表明，使用未经处理的 CRCA 降低了马歇尔商数和沥青混凝土的抗车辙性。刚度模量和动态蠕变试验的结果表明，由于沥青混凝土刚度的降低，CRCA 掺入增加了试验试样的永久变形。然而，含有处理过的 CRCA 的沥青混凝土具有较低的永久变形，因为 WPB 通过渗透其空隙和增强水泥砂浆来促进 CRCA 的稳定性。此外，随着温度的升高，所有沥青混凝土的抗车辙强度均下降，而改性试件的降低率更高。