Polyolefin Elastomer Modified Asphalt: Performance Characterization and Modification Mechanism

The rapid growth of traffic load and volume has put forward higher requirements for road durability. To extend the service life roads, this work investigated feasibility using polyolefin elastomers with a two-phase molecular structure to simultaneously improve high low-temperature performance asphalt. characteristics modifier were evaluated by differential scanning calorimetry first. Following evaluation, storage stability, workability, rheological properties modified polyolefin-modified asphalt measured through softening point difference, rotary viscosity, dynamic shear rheometer, bending beam rheometer. Additionally, engineering mixtures was also Marshall wheel-tracking, three points experiments. results show that two glass transition which facilitate simultaneous improvement Meanwhile, no concerns are found about stability workability Furthermore, indicate can significantly enhance deformation resistance at high-temperature cracking binders. While fatigue is slightly reduced, residual ultimate tensile strain mixture containing 8% 1.05 times, 1.31 1.17 times those control sample, respectively. infrared spectroscopy demonstrate there chemical reaction between virgin on be explained existence both “rigid” “flexible” structures in polyolefin.