Dynamic chemistry approach for self-healing of polymer-modified asphalt: A state-of-the-art review

•Self-healing mechanism based on dynamic chemistry is clarified.•Dynamic covalent bonds and non-covalent bonds are employed for self-healing.•Types of the self-healing polymers and their modified asphalt are introduced.•Methods at different scales are summarized for self-healing performance evaluation.•Improvements are discussed for better self-healing of polymer-modified asphalt.