Using SBS/terpene-styrene resin blends as a novel high-viscosity asphalt modifier

摘要

To improve the inferior stability in high-viscosity asphalt prepared using styrene-butadiene-styrene block copolymer (SBS) and to simplify the preparation process, a novel high-viscosity modifier (STP) was prepared with SBS, terpene-styrene resin (TSR) and plasticizer. Its inherent properties, optimal dosage, and modification effect were investigated. The results show that STP has lower component melting temperature and stronger polarity, combined with good thermal stability, ensuring that STP possesses a better modification effect on asphalt. 14.5-17.6 wt% was determined as the appropriate content of STP. The incorporation of STP improved the rutting resistance and elasticity percentage of the asphalt. The zero shear viscosity (ZSV) of asphalt fitted by the Carreau model showed that STP increased the cohesion of the asphalt system and improved the high-temperature deformation resistance. The small non-recoverable creep compliance value proves that the STP high-viscosity asphalt (STP-HVA) exhibits excellent resistance to permanent deformation at high-temperatures while displaying low-stress sensitivity and achieving an extremely heavy traffic rating. STP confers greater flexibility to asphalt to eliminate low-temperature cracking phenomenon. Smaller CMAI and PAAI values demonstrate that STP-HVA exhibits outstanding aging resistance. TSR effectively improves the compatibility of SBS and base asphalt, and STP particles are finely dispersed and uniform. The preparation process is mainly physical modification, accompanied by chemical reactions.