Abstract
Abstract To quickly and accurately evaluate the creep deformation and elastic recovery performance of polymer-modified bitumen, a new bitumen quality control test (QCT) was carried out to analyze the creep deformation and recovery properties of styrene-butadiene-styrene (SBS)-modified bitumen and rubber powder–modified bitumen with different modifier dosage at 15°C, 20°C, 25°C, and 30°C. At the same time, the creep deformation speed of different polymer-modified bitumens was also investigated based on the QCT results. Then, the penetration and dynamic shear rheological tests were implemented on these binders to establish the relationship between QCT indexes (maximum creep deformation and deformation recovery rate) and physical–rheological indexes (penetration and complex viscosity). Results show that the creep deformation resistance and elastic recovery ability of bitumen enhance gradually with the increase of both SBS and rubber powder. Between SBS and rubber powder, SBS exhibits a more significant influence on the creep deformation resistance and elastic recovery properties of bitumen than rubber powder under the same temperature and modifier dosage. A polymer-modified bitumen with smaller penetration and bigger complex viscosity is prone to better creep deformation resistance and elastic recovery performance.
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