Evaluation of trans-polyoctenamer and cross-linking agents on the performance of waste polystyrene modified asphalt

Abstract

The incorporation of waste plastic materials such as polystyrene (PS) in asphalt pavement has shown promise to improve its durability and simultaneously help alleviate the environmental problems caused by waste plastic sources. But the addition of these materials introduces issues such as poor mixability and phase separation during the paving process. Studies have shown that the inclusion of various reactive polymeric additives and cross-linking agents may help improve these issues. The aim of the present work is to examine the feasibility of using trans-polyoctenamer and sulphur based modifiers to enhance the performance properties of PS-modified asphalt. To achieve this objective, various modified binder samples were prepared and characterised through numerous conventional and Superpave rheological assessments including storage stability, dynamic shear rheometer and bending beam rheometer tests. The results of the laboratory evaluation indicated the modified binder samples met storage stability requirements, showed a significant improvement in elastic recovery and provided better overall performance compared to the conventional binder.

Keywords:

• modified asphalt
• trans-polyoctenamer
• cross-linking agent
• waste recycling