İzmir Institute of Technology, Engineering Faculty, Department of Civil Engineering, İzmir, Turkey.
Adana Alparslan Türkeş Science and Technology University, Engineering Faculty, Department of Civil Engineering, Adana, Turkey.
Waste Manag. 2020 Jun 1;110:1-9. doi: 10.1016/j.wasman.2020.05.012. Epub 2020 May 19.
Bitumen ages in the short and long-term due to environmental conditions. As the bitumen ages, it loses its original properties and flexibility. Hardened bitumen causes certain distresses in pavement that may endanger traffic safety and reduce travel comfort. Bitumen is one of recoverable material, however some techniques may not be ecological due to considerable energy, time, and cost. On the other hand, recovering of aged bitumen might be eco-friendlier, energy-efficient, and economic by using bio-based waste materials such as waste vegetable cooking oils (WVCO). In this perspective, this paper was established on the idea of sustainable recovery of aged bitumen and WVCO. Base bitumen was aged in case of short-term (ST) and long-term (LT) in laboratory condition and modified with WVCO ranging from 2 to 10% by weight of bitumen. To determine the effect of WVCO modification on aged bitumen conventional and rheological test methods were utilized. To find the optimum rate of WVCO for full recovery of aged bitumen, an index called Pure Rejuvenation Index (PRI) was specified and applied for each test results. It can be concluded from PRI analyses that WVCO can be used as rejuvenator to recover aged bitumen and approximately 3% and 6% of WVCO are required for ST and LT aged bitumen cases, respectively. However, different test methods yield different optimum rates of WVCO for ST and LT aged bitumen. Recovering of WVCO and aged bitumen by using together may provide environmental protection and conservation of resources.
由于环境条件的影响，沥青会在短期和长期内老化。随着沥青的老化，它会失去原有的特性和柔韧性。变硬的沥青会导致路面出现某些损坏，这可能危及交通安全，降低行车舒适性。沥青是一种可回收材料，但是某些技术可能由于需要大量的能源、时间和成本而不环保。另一方面，通过使用生物基废油等可回收的废油材料（如废植物油），回收老化的沥青可能更环保、节能且经济。从这个角度来看，本文基于可持续回收老化沥青和废油的想法而提出。基础沥青在实验室条件下进行短期（ST）和长期（LT）老化，并以 2%至 10%（按沥青重量计）的比例用 WVCO 进行改性。为了确定 WVCO 改性对老化沥青的影响，使用了常规和流变测试方法。为了找到完全回收老化沥青的 WVCO 最佳用量，指定并应用了一个称为纯再生指数（PRI）的指标来分析每个测试结果。从 PRI 分析可以得出结论，WVCO 可以用作恢复老化沥青的再生剂，对于 ST 和 LT 老化的沥青，分别需要大约 3%和 6%的 WVCO。然而，不同的测试方法对 ST 和 LT 老化的沥青的 WVCO 最佳用量有不同的要求。共同回收 WVCO 和老化沥青可能有助于保护环境和节约资源。
