植物油/湖沥青复合改性沥青的性能分析OA

To investigate the feasibility of composite modification using vegetable oil and Trinidad Lake asphalt,based on preliminary experiments and existing research findings,composite modified asphalt samples with VO content of 0%,5%,10%,and 15%were prepared by maintaining a fixed TLA dosage of 30%.The five asphalt samples were tested using penetration,softening point,ductility,viscosity,rotating thin film oven test(RTFOT),and thermogravimetric analysis(TGA).The experimental results indicate that the addition of vegetable oil significantly improves the low-temperature ductility and construction workability of TLA modified asphalt.Notably,at a VO content of 10%,the ductility reaches 26.5 cm,which is 40.2%higher than that of the control group without vegetable oil.However,as the VO content increases,the softening point and viscosity of the modified asphalt exhibit a significant decreasing trend.At a VO content of 15%,the softening point decreases by 52%,markedly impairing its high-temperature stability.Furthermore,the 10%VO/TLA composite modified asphalt shows the lowest mass loss rate during aging,whereas the 15%VO composite system exhibits higher sensitivity to thermo-oxidative aging.Thermogravimetric analysis reveals that the 10%VO/TLA composite modified asphalt demonstrates the optimal thermal stability in the temperature range of 200-500℃,with a total mass loss rate of 78.3%,achieving a relatively favorable balance between decomposition rate and mass loss.