| Summary: | Microalgae oil (MO) and styrene-butadiene-styrene block copolymer (SBS) were used as composite regenerants to blend into aged asphalt to prepare MO/SBS composite regenerated asphalt. The basic physical properties, high and low temperature rheological characteristics and fatigue characteristics of composite recycled asphalt were compared. The effects of the ratio and amount of MO and SBS on the regeneration effect of aged asphalt were investigated. The results showed that the viscoelastic deformation ability of pure MO recycled asphalt could recover to a certain extent to the level before aging, but there was still a certain gap. On this basis, MO/SBS composite regeneration could significantly improve the high-temperature deformation resistance and elastic recovery performance, and its critical temperature was 1.1~9.7 ℃ higher than that before aging. At the same time, it also reduced the sensitivity of recycled asphalt to fatigue strain to improve fatigue resistance. However, the low-temperature creep deformation ability of MO/SBS composite recycled asphalt was lower than that of base asphalt. When the mass fraction of MO and SBS were 8% and 4%, the composite recycled asphalt had better rheological and fatigue characteristics at high and low temperature.
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