Kumar Vikas, Coleri Erdem, Obaid Ihsan, Belc Anda Ligia, Sutherland Alex James
School of Civil and Construction Engineering, Oregon State University, Corvallis, OR 97331, USA.
Road and Transport Department, College of Engineering, University of Al-Qadisiyah, Al Diwaniyah 58002, Iraq.
Materials (Basel). 2022 Jul 13;15(14):4873. doi: 10.3390/ma15144873.
In recent years, due to the advent of several additives and innovations, asphalt mix design has become more complex. The mixes meeting the volumetric mix design requirements may still fail prematurely in the field. Thus, a transition from a simplistic volumetric-based mix design to a performance-based mix design is required, which was also envisioned in the Strategic Highway Research Program (SHRP) and Superpave mix design. In addition to performance verification, asphalt mix designs should also be evaluated for the life-cycle costs and environmental impact to encourage durable as well as sustainable and cost-effective alternatives. In this study, three asphalt mixtures with different reclaimed asphalt pavement (RAP) contents and additives were evaluated for cracking and rutting performance by using different performance thresholds for asphalt mixtures that are generally used in the construction of high-volume roads in Oregon. A balanced mix design process was followed to determine the required binder content for the three mixtures. Based on the life cycle cost and environmental impact analyses, the mixture with warm mix additive (WMA) was selected as the most economically and environmentally viable asphalt mixture to be used for construction in Oregon.
近年来，由于多种添加剂的出现和创新，沥青混合料设计变得更加复杂。满足体积配合比设计要求的混合料在现场仍可能过早失效。因此，需要从简单的基于体积的配合比设计过渡到基于性能的配合比设计，这也是战略公路研究计划（SHRP）和Superpave配合比设计中所设想的。除了性能验证外，还应评估沥青混合料设计的生命周期成本和环境影响，以鼓励采用耐用、可持续且具有成本效益的替代方案。在本研究中，通过使用俄勒冈州大容量道路建设中通常采用的不同沥青混合料性能阈值，对三种不同再生沥青路面（RAP）含量和添加剂的沥青混合料的抗裂和抗车辙性能进行了评估。遵循平衡配合比设计流程来确定这三种混合料所需的结合料含量。基于生命周期成本和环境影响分析，选择了含有温拌添加剂（WMA）的混合料作为在俄勒冈州用于施工的最经济和环境可行的沥青混合料。
