Preparation And Application Performance Of The Bitumen Modified With Recycled Multilayer Co-extrusion Ploymer Scraps

Polymer has been successfully and extensively employed to modify asphalt. It has been considered that polymer not only improves the track resistance at high temperature, but also gives an excellent performance of the modified asphalt pavement. Moreover, it is a promising approach to modify the asphalt with recycled polymer. For it results in both saving oil resources and pretecting the environment. In this paper, wasted multi-layer co-extrusion ploymer scraps (r-MCEPS) or wasted polyethylene (r-PE) were employed as the main modification agent, and the organic nanometer montmorillonite(OMMT) and styrene-butadiene-styrene (SBS) as the auxiliary modification agent to modify 70# heavy road petroleum asphalt on a high-speed shear emulsifying machine.The microscopic phase morphology, rheological properties and conventional means were used to investigated the structure and the performance of the modified asphalt. The results of microscopic phase morphology of wasted polymer-modified asphalt show that "sea-island" structure forms when the asphalt is modified with the wasted polymers. The wasted polymer with particles and filamentous disperse in asphalt, forming a stable network structure. It has been also found that the storage stability of the wasted polymer-modified asphalt increases with the presence of wasted polymer. The r-MCEPS modified asphalt is better than the r-PE in the performance at high temperature. The best concent of the r-MCEPS was 6phr.It is found that OMMT improves the storage stability of r-MCEPS modified asphalt. As the result of the r-MCEPS/OMMT composite modified asphalt storage stability are better than r-MCEPS modified asphal. When the OMMT added, the system of the r-MCEPS/OMMT modified asphalt was beneficial to form network structure and improve the high temperature stability of the modified asphalt. When the OMMT content reaches 2.5phr, the r-MCEPS/OMMT composite modified asphalt gives the best storage stability, but the storage modulus and rutting resistance factor are lower than that of r-MCEPS modified asphalt.Finally, the comprehensive performance of r-MCEPS/OMMT composite enhanced by SBS was also investigated. The experimental results show that the presence SBS leads to the increment of energy storage modulus and TSHRP. When the SBS content reaches 3phr, the structure system of the r-MCEPS/OMMT/SBSis not only the most stable, but also the comprehensive performance were the best.