Study on the Rheological Properties of Sasobit/SBR Composite Modified Asphalt
To develop a composite modified asphalt that balances high and low-temperature performance while being environmentally friendly,this study selected Sasobit and SBR as modifiers to prepare a composite modified asphalt with good high and low-temperature properties.The rheological properties of the composite modified asphalt before and after aging with different mixing ratios(Sasobit content of 0%,1%,2%,3%,4%;SBR content of 0%,3%,4%,5%,6%)were studied to determine the optimal mixing ratio of Sasobit/SBR composite modified asphalt.The modification mechanism of composite modified asphalt was investigated using infrared spectroscopy,and the dispersion of modifiers in asphalt was observed using fluorescence microscopy.The results show that the addition of Sasobit improves the high-temperature rheological performance of asphalt and reduces its low-temperature rheological performance;the addition of SBR improves the low-temperature rheological performance of asphalt but has no significant effect on high-temperature rheological performance.Considering cost-effectiveness,the optimal mixing ratio for the composite modified asphalt is 3%Sasobit+5%SBR.The study of the modification mechanism using infrared spectroscopy indicates that the modification mechanism of composite modified asphalt is physical modification,with both modifiers evenly distributed in the asphalt and cross-linking structures formed.
SasobitSBRrheological propertiesshort-term agingmicroscopic study
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