Mechanical and Self-Healing Performances of Asphalt Mixtures Containing Recycled Asphalt Materials and Light-Activated Self-Healing Polymer

Document Type


Publication Date



The objective of this study is to evaluate the efficiency of a new generation of ultraviolet (UV) light-induced self-healing polymers in enhancing the durability of asphalt mixtures and improving their self-healing capabilities. Mixtures were prepared using two different binders, with and without recycled materials, and self-healing polymers. Results showed that the addition of recycled asphalt materials to mixtures prepared with an unmodified binder (PG 67-22) negatively affected healing recovery at room temperature. The self-healing properties of the mixtures were improved by increasing the healing temperature from 25°C to 50°C, which indicates the temperature dependency of the self-healing properties of asphalt mixtures. The addition of 5% self-healing polymers to the control mixture followed by 48 h of UV light exposure resulted in an increase in the self-healing properties of the mixtures prepared with PG 67-22 binder. Semicircular bending (SCB) test results showed that the incorporation of self-healing polymer and 48 h of UV light exposure improved the cracking resistance of the mixture. Loaded-wheel tracking (LWT) test results showed that the addition of the self-healing polymer caused an increase in the rut depth of the samples prepared with the unmodified binder. However, the final rut depth was less than 6 mm, which is an acceptable rutting performance. Thermal stress restrained specimen test results showed that self-healing polymer improved the low-temperature cracking performance of the mix by increasing the fracture load and decreasing the fracture temperature.

Publication Source (Journal or Book title)

Journal of Materials in Civil Engineering

This document is currently not available here.