Synthesis Strategy and Basic Validation of Recyclable Epoxy Asphalt

The inefficient regeneration of epoxy asphalt is an increasingly serious problem that has greatly restricted its application and development. To alleviate this severe difficulty, recyclable epoxy asphalt has been designed on the basis of the reversibility of dynamic covalent bonds, taking into consideration its nonrenewable characteristics. The synthesis strategy and basic validation of recyclable epoxy asphalt were therefore preliminarily implemented in this study. According to the screening of reversible covalent bond-forming reactions (Diels–Alder reaction), the design scheme of recyclable epoxy asphalt was first proposed. Then the preparation and regeneration processes of recyclable epoxy asphalt were designed and adjusted to give a series of optimal solutions. Finally, samples of recyclable epoxy asphalt and conventional epoxy asphalt were analyzed and tested microscopically before and after regeneration. In comparison with conventional epoxy asphalt, recyclable epoxy asphalt exhibited outstanding sustainability and damping characteristics. Moreover, the damping characteristics of recyclable epoxy asphalt after regeneration were still better than those of conventional epoxy asphalt, which indicated that recyclable epoxy asphalt displayed promising performance. According to the regeneration efficiency, it can be concluded that recyclable epoxy asphalt was successfully prepared. However, mechanical properties of recyclable epoxy asphalt still need to be optimized from the perspective of the proportions of materials.