How do isocyanate additives affect the aging behavior of asphalt?

Label:chem

Topic
Isocyanate-modified asphalt has been observed to exhibit changes in performance due to aging, which can affect its long-term durability.

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
The aging of isocyanate-modified asphalt primarily affects its high-temperature performance, followed by low-temperature performance and fatigue resistance. However, isocyanate additives can also be used to rejuvenate aged asphalt by connecting broken SBS chains and restoring the cross-linked structure.
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