What are the limitations of Polyurethane Prepolymer (PUP)-modified asphalt?

Label:chem

Topic
Despite the potential benefits of PUP in modifying asphalt, there are certain limitations that affect its widespread application.

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 limitations of PUP-modified asphalt include high cost, environmental sensitivity (sensitivity to humidity and temperature), and a complex construction process requiring precise control over the ratio and mixing conditions of PUP and asphalt.
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