JongSu Kim  SooHyeon Choi  ChangYoung Kim  YongTae Joo  SooHwa Jeong

Vol. 30,  No. 4, pp. 314-321, Dec.  2024
10.7464/ksct.2024.30.4.314

Industrial solid waste Waste tire Pyrolysis Sulfur Asphalt binder

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Recently, there has been significant progress in pyrolysis research and development for waste tires. Pyrolyzing waste tires can yield 60% oil, 30% residue, and 10% gas. Waste tire oil contains approximately 1 wt.% sulfur due to the vulcanizing agent in the tires. Removing sulfur from the pyrolytic oil requires a hydrodesulfurization process, but this is not economically feasible because hydrogen and a catalyst must be used at a high temperature and pressure. This study verified the performance ameliorating effect of asphalt binder using waste tire pyrolysis by-products (oil and char). The effect of the asphalt binder was analyzed through general physical properties (penetration, softening point, ductility, flash point). Furthermore, the compatibility rating was measured using the process pressure aging vessel test and bending beam rheometer test. It was found that mixing char with the asphalt binder caused the penetration to be out of specification and become unusable. The baseline value was satisfied when the softening temperature was decreased while using oil and a flash point above 260 oC. The penetration tendency increased as the pyrolytic oil consumption increased. As the proportion of pyrolytic oil increases, the fatigue crack resistance and creep stiffness decrease, and the m-value increases. The modified asphalt binder blended with pyrolytic oil at 5 wt.% satisfied both the physical properties and the public utility rating criteria.