Investigating the Rheological Properties of Styrene-Butadiene-Styrene-Based High-Viscosity Modified Asphalt Using Carbon Nanotubes

Styrene-butadiene-styrene (SBS) is currently the most widely used asphalt modifier. However, high-SBS-concentration high-viscosity modified asphalts (HVMA) are characterized by poor flow and storage instability. To make up for lack of performance traditional SBS-HVMA, a nano-based composite with excellent was developed. Since carbon nanotubes (CNTs) nanomaterials, they prone to agglomeration when added asphalt, dispersion effect poor, which affects modifier’s contribution rate. better disperse CNTs in nanomaterials were modified, two new CNT additives prepared combining polymers CNTs. The appropriate ratio these selected be further combined SBS obtain CNTs/SBS-HVMA. characteristics anti-aging properties three kinds bitumen different temperature ranges studied taking common SBS-HVMA Tafpack super (TPS) (TPS/SBS-HVMA) as comparison samples evaluating road stone mastic (SMA-13) mixture. stability, workable performance, rheological characteristics, aging resistance analyzed through segregation test, dynamic viscosity analysis, Brookfield measurements, bending beam rheometer (BBR) tests, shear (DSR), multiple stress creep recovery (MSCR) before after short-term aging. experimental results showed that CNT/SBS-HVMA exhibited good stability workability. DSR measurements other tests revealed TPS/SBS-HVMA had higher low-temperature flexibility than asphalts, while high-temperature resistance, deformation resistance. Through verification mixture it found rutting CNTs/SBS-HVMA 7% 28% those TPS/SBS-HVMA, respectively, but 5% lower SBS-HVMA. This CNT/SBS addition improved without significant negative impact on asphalt.