What is the role of isocyanate additives in asphalt modification?

Label:chem

Topic
Isocyanates are compounds containing –NCO groups that readily react with compounds containing active hydrogen atoms such as amines, water, alcohols, acids, and bases. They are used to chemically modify asphalt by forming cross-linking networks with the resin and asphaltene components of asphalt.

From: "Application of isocyanate-based materials in asphalt pavement: A review", Journal of Road Engineering, Volume 5, Issue 2, June 2025, Pages 261-278
Answer
Isocyanate additives improve the performance of asphalt by forming a cross-linking network with the resin and asphaltene components, thereby enhancing the stiffness, elasticity, and thermal stability of the modified asphalt. They also reduce the modification temperature due to their liquid form.
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