This study presents a procedure for design and preparing the open-graded asphalt (OGA) mixture used in the semi-flexible pavement (SFP) according to the principle engineering characteristics and performance. In this study, different aggregate gradations, cellulose and synthetic fibers, modified and neat asphalt binders, and air void contents were used to prepare the OGA mixtures. Furthermore, several experimental tests, including the Cantabro, Semi-circular bending (SCB), binder drainage, indirect tensile strength (ITS), wheel tracking, and permeability tests were conducted to assess the engineering properties of the OGA mixtures. According to the results of the mechanical tests (i.e., Cantabro, moisture sensitivity, semi-circular bending, and rutting), the increase of air void content in OGA mixtures causes a reduction in the failure resistance. However, considering the rutting and ITS test results, the performance of SFP (OGA mixture filled with grout) increases as the initial air void content of the OGA mixtures increases, which is because of the higher infiltration of grout inside of OGA mixture and higher internal integrity. The results of the mechanical performance tests on OGA mixtures indicate that the low and high ranges of the air void content to acquire most possible mechanical performance are 25% and 30–35%, respectively.

本研究根据原理工程特性和性能，介绍了用于半柔性路面 (SFP) 的开级配沥青 (OGA) 混合物的设计和制备程序。在这项研究中，使用不同的骨料级配、纤维素和合成纤维、改性和纯沥青粘合剂以及空隙含量来制备 OGA 混合物。此外，还进行了多项实验测试，包括 Cantabro、半圆弯曲 (SCB)、粘合剂排水、间接拉伸强度 (ITS)、车轮跟踪和渗透性测试，以评估 OGA 混合物的工程性能。根据力学测试（即 Cantabro、湿敏性、半圆弯曲和车辙）的结果，OGA 混合物中气孔含量的增加导致抗破坏性降低。然而，考虑到车辙和 ITS 测试结果，SFP（填充水泥浆的 OGA 混合物）的性能随着 OGA 混合物初始空隙含量的增加而增加，这是因为 OGA 混合物内部的水泥浆渗透率更高，内部结构更高。正直。OGA 混合物的机械性能测试结果表明，获得最大可能机械性能的气孔含量的低和高范围分别为 25% 和 30-35%。