Laboratory investigation of self-healing polyurethane pre-polymer modified asphalt mixtures
This study examined the effect of a new generation of light-activated self-healing polyurethane prepolymer on self-healing and mechanical performance of asphalt mixtures. This new modifier was designed to enhance the performance of the asphalt pavement while increasing its crack healing rate. Modified asphalt binder was produced using an optimized reactive method. Asphalt mixtures were prepared using three different percentages of self-healing polymer (5%, 10%, and 15%). Prepared samples were tested using semi-circular bending test, loaded wheel tracking test, and crack healing test. Furthermore, asphalt binder was extracted and tested using a dynamic shear rheometer. Results obtained from self-healing tests demonstrated an enhanced crack sealing rate with the addition of SPP, however, using 15% SPP can lead to loss of cohesion and strength of the asphalt mixture. Furthermore, an increased rutting resistance at high temperature and improved cracking resistance at intermediate temperature was observed with the addition of 5% SPP. A further increase in the percentage of SPP may have negative effects on the cracking performance due to loss of strength and cohesion.
Publication Source (Journal or Book title)
Tran-SET 2020 - Proceedings of the Tran-SET Conference 2020
Shirzad, S., Hassan, M., & Mohammad, L. (2021). Laboratory investigation of self-healing polyurethane pre-polymer modified asphalt mixtures. Tran-SET 2020 - Proceedings of the Tran-SET Conference 2020, 141-149. https://doi.org/10.1061/9780784483305.015