Application of isocyanate-based materials in asphalt pavement: A review

Isocyanate and its products are playing an increasingly important role in the high-performance development of asphalt pavement, but researchers have always focused on polyurethane (PU), one of the isocyanate products, and neglected the other roles of isocyanate-based materials in asphalt pavement. The application of isocyanate-based materials in asphalt pavement is still in the exploratory stage, and the research direction is not clear. It is necessary to summarize and propose research directions for the application of isocyanate-based materials in asphalt pavement. Therefore, this paper reviews the application of isocyanate-based materials in asphalt pavement, classifies the products synthesized from isocyanate for asphalt binder, introduces the application effects of different isocyanate-based materials in asphalt binder, and analyzes the limitations of each material. Meanwhile, the other roles of isocyanate-based materials in asphalt pavement, such as coating materials and adhesive materials, are summarized. Finally, the development direction of isocyanate-based materials in asphalt pavement is prospected. Isocyanate-based materials are expected to significantly increase the service life of asphalt pavement because of their excellent properties. With the advancement of technology, the application of isocyanate-based materials will become more and more common, promoting the sustainable development of road construction. This paper can provide a reference for the development and application of isocyanate-based materials in asphalt pavement.