| To save energy, protect environment and improve the level of warm mixing technology, the low cost, green and environmentally friendly biomass oil is used as the warm mixing agent to warm 70# Jingbo, 70# Lunte, 90# Lunte petroleum asphalt. The biomass oil with the best warm mixing effect and optimal blending range is determined through rotational viscosity experiment, and indicators as penetration, softening point, ductility at 10 ℃, etc.. Through dynamic shear rheological experiment and bending beam rheological experiment, the high and low temperature rheological properties of the best biomass oil warm mixed petroleum asphalt are evaluated. Through infrared spectroscopy experiments, the mechanism of action of three biomass oils on petroleum asphalt is studied. Through four component analysis method, the reason for the difference in viscosity reduction effect of biomass oil A, B and C is researched. The results of the viscosity experiment show that among the three kinds of biomass oils, 4% of biomass oil A can reduce the 135 ℃ viscosity of 70# Jingbo, 70# Lunte and 90# Lunte petroleum asphalt by more than 30%, the viscosity reduction effect is the best, but the viscosity reduction range of biomass oils B and C does not reach 30% of the requirement of the warm mixing agent, the effect is poor. The experimental results of the three indicators show that the best content range of biomass oil A for the three petroleum asphalts is 2% 5%. The rheological performance test results show that biomass oil A improves the low temperature crack resistance of the three petroleum asphalts and reduces the high temperature rutting resistance. Infrared spectroscopy results show that there are no new characteristic peaks in the spectrum of 70# Jingbo, 70# Lunte and 90# Lunte petroleum asphalt mixed with biomass oils A, B and C. Therefore, the three kinds of biomass oils and petroleum asphalt mixing process is a physical change. The four component analysis results show that biomass oil A has a higher content of saturation, which weakens the gravitational field of the asphalt micelle system, increases the dispersion of the asphalt micelles, and reduces the viscosity of the asphalt. However, the contents of biomass oils B and C saturated components are low, the ability to disperse micelles is poor, and the viscosity reduction effect is poor. |
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