Microwave heating mechanism and Self-healing performance of scrap tire pyrolysis carbon black modified bitumen
Fu Wang (Wuhan Institute of Technology)
Hongbin Zhu (Wuhan Institute of Technology)
Yuanyuan Li (Wuhan Institute of Technology)
Dengjun Gu (Wuhan Institute of Technology)
Yangming Gao (TU Delft - Pavement Engineering)
Jianlin Feng (Wuhan Institute of Technology)
Benan Shu (Foshan Transportation Science and Technology Co.)
Chao Li (Foshan Transportation Science and Technology Co.)
Shaopeng Wu (Wuhan University of Technology)
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Abstract
Conventional asphalt mixture has poor microwave absorbing performance and microwave heating efficiency. Based on the characteristics of dielectric loss of scrap tire pyrolysis carbon black (PCB), it is proposed to improve the microwave absorbing performance and self-healing rate of bitumen. The phase composition and electromagnetic parameters of PCB were tested to reveal its microwave heating mechanism. The preparation parameters, heating characteristics and self-healing properties of PCB modified bitumen were studied through the dispersion uniformity test, microwave heating test and SCB test. The main phases of PCB are microwave absorbing carbon and silicon, indicating that PCB is a good electric loss microwave absorbing material. 40 min is the recommended mixing time of 15% PCB modified bitumen. PCB's dosage, microwave frequency and microwave heating time have significant effects on the microwave heating characteristics of PCB modified bitumen. PCB can improve high-temperature stability, thermal conductance, heat storage capacity and self-healing rate of bitumen.