High- and low-rheological properties and modification mechanism of PUP/SBS composite-modified asphalt

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Department of Civil, Environmental, and Geospatial Engineering


To improve the low-temperature creep performance of polyurethane solid-solid phase change material modified asphalt, the composite modified asphalt of polyurethane solid-solid phase change materials (PUP) and styrene-butadiene-styrene block copolymer (SBS) was prepared. Dynamic shear rheology and bending beam rheology tests were used to study the high- and low-temperature rheological properties of the composite modified asphalt. The mechanism of the composite modification was explored by infrared spectroscopy, fluorescence microscopy, and atomic force microscopy. The results show that the high-temperature rutting resistance of asphalt increases while the low-temperature creep performance decreases with the increase of the mass fraction of PUP. The rutting factor, the creep modulus stiffness, and the creep rate of the modified asphalt with the PUP mass fraction of 10% are 31.75 kPa, 446.52 MPa, and 0.22, respectively. The high- and low-temperature rheological performance of PUP/SBS composite modified asphalt is better than that of PUP modified asphalt. The performance grade (PG) of the composite modified asphalt with the PUP mass fraction of 10% and the SBS mass fraction of 5% is 82-21 with a good grading temperature range. The composite modification of asphalt by PUP and SBS is a physical modification. SBS forms cross-linking between PUP and asphalt. The microscopic anti-cracking properties and the elasticity of asphalt are improved after the composite modification.

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Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition)