Tomoya Yamada

Research on how to regenerate old asphalt and how to evaluate it in consideration of repetitive regeneration

Osamu Takahashi

In Japan, asphalt has been reused as part of the realization of a recycling-oriented society. On the other hand, the quality of the old asphalt adhering to the regenerated aggregate has deteriorated significantly due to repeated regeneration. In the current regeneration method, it is standard to use a regeneration additive on the old asphalt to restore the degree of needle penetration to the same level as the new asphalt. However, this degree of needle penetration is an index that relatively indicates only the hardness of asphalt, and it is not possible to evaluate mechanical properties such as cohesive force and adhesive force. Therefore, in this study, we evaluated the properties of regenerated asphalt by the Force Ductility Test, which can properly evaluate the caking performance of asphalt, and examined a more efficient regeneration method considering repeated regeneration.