Preparation and Characterization of a Novel Self-Healing Polyurethane-Modified Asphalt Based on Dynamic Disulfide Bond
JOURNAL OF MATERIALS IN CIVIL ENGINEERING(2024)
Abstract
Asphalt pavement will crack under the action of traffic load and harsh environment, and the cracks can be repaired by the self-healing properties of asphalt itself, but the healing efficiency is lower. This study developed a novel self-healing asphalt based on disulfide-crosslinked polyurethane elastomer. A low-cost crosslinking agent (CY-OA) was synthesized from cystamine dihydrochloride as raw material, and then a disulfide-crosslinked polyurethane prepolymer (PU-SS) was synthesized using a stepwise copolymerization method for modification of asphalt to obtain a self-healing polyurethane-modified asphalt. The chemical properties, microscopic morphology, and self-healing capability of disulfide-crosslinked polyurethane elastomer and polyurethane-modified asphalt were evaluated in this study. Infrared spectroscopy confirms the introduction of CY-OA into the polyurethane main chain. Thermal gravimetric analysis shows excellent thermal stability of PU-SS. Healing tests demonstrate that disulfide bonds enhance the self-healing ability between polyurethane elastomer and asphalt binder. PU-SS exhibits a healing efficiency as high as 96.33% within 12 h at 60 degrees C. With an increase in PU-SS content and repair time in the modified asphalt, the repair efficiency increases, with a maximum fatigue recovery index of 80%. The objective of this study is to introduce dynamic covalent bonds to enhance the self-healing performance of asphalt and improve the long-term crack resistance of asphalt pavement.
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Key words
Self-healing,Asphalt,Disulfide crosslinked,Polyurethane
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