Abstract
The castor oil-polyurethane pre polymer (C-PU) terminated with NCO group was synthesized by renewable castor oil and liquefied MDI as asphalt modifier and C-PU modified asphalt with 10–40wt% C-PU were prepared. Classical and rheological properties were investigated. The results showed that, softening point and ductility of C-PU modified asphalt were both increased, while penetration was decreased to some extent. With the increase of C-PU, the modulus increases and the phase angle decreases which showed an improved resistance to deformation. Among them, 30wt% is the best dosage. Moreover, Brookfield viscosity of the modified asphalt varies little at 130°C with the time prolonged and a fairly homogeneous dispersion system was observed by microscope, which indicated that the thermal stability of modified asphalt at 130°C was good. FTIR analysis showed that C-PU with NCO terminated could react with water and active hydrogen in asphalt and air. The transition from the simple physical blending with asphalt to slowly chemical modification process could explain the improvement of the asphalt performance.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
