https://orcid.org/0000-0002-9936-938X
Abstract
With inspiration from the healing of wound or fractures in living species, producing self-healable material has been investigated in the past decades. As the main component of the asphalt mixture used for road pavement, bitumen is prone to cracking under load cycles and environmental conditions. However, bitumen has the ability to heal its cracks over time inherently. Intensifying the inherent self-healing property of bitumen can significantly reduce road pavement disasters, increase users’ safety, and save a tremendous amount of money needed for the rehabilitation of pavement. To improve the self-healing of bitumen, neat bitumen was modified by polyurethanes with healable polymer networks. Also, to improve the compatibility of polyurethane with bitumen and enhance its self-healability, castor oil was used as a biomodifier in the synthesis of polyurethane. Different dosages of synthesized polyurethane produced from toluene diisocyanate and castor oil (TDI-CO) were introduced to bitumen; then the self-healing of modified blends was compared with neat bitumen using fracture-based tests at different temperatures and ages. Fourier transform infrared spectroscopy showed proper in situ polymerization of biobased polyurethane in bitumen. It also showed a reduction in the aging of bitumen by lowering carbonyl and sulfoxide (known products of aging in bitumen) by 72 % and 50 % after long-term aging. Inherent healing and ductility tests indicated the efficiency of polyurethane modification by taking advantage of regeneration of hydrogen bonds in biomodified polyurethane, reaching 100 % healing after 30 min. It confirmed that an increase in temperature improved self-healing nonlinearly, and aging deteriorated it. Owing to the supramolecular structure of polyurethane, TDI-CO showed considerable improvement in bitumen healing even at low temperatures.
Issue Section:
Technical Papers
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