为探究布敦岩沥青(BRA)、苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)及C9石油树脂复合改性沥青在不同配比下的高温、低温及抗疲劳性能。采用响应面法中的Box-Behnken设计方法,分别对不同配比的BRA/SBS/C9石油树脂复合改性沥青进行温度扫描、多应力重复蠕变、线性振幅扫描和低温蠕变劲度试验。结果表明:BRA与SBS可显著增强沥青高温性能;随BRA掺量的增加,抗疲劳性能逐渐提升,但其低温性能先升后降;SBS掺量变化对低温与疲劳性能影响轻微。BRA与SBS交互作用决定高温抗变形能力;BRA和C9石油树脂共同把控沥青低温与抗疲劳性能;SBS和C9交互作用则左右沥青高温抗永久变形能力。最优配比复合改性沥青的预测值与实际值相对误差在5%以内,模型精度较高,未来研究可基于此调整指标权重以适应不同道路条件。
To investigate the high-temperature,low-temperature,and anti-fatigue performance of Buton-rock asphalt (BRA),styrene-butadiene-styrene block copolymer (SBS),and C9 petroleum resin composite modified asphalts at different ratios,the Box-Behnken design method in response surface methodology was employed to conduct temperature sweep,multiple stress creep recovery,linear amplitude sweep,and low-temperature creep stiffness tests on BRA/SBS/C9 petroleum resin composite modified asphalts with different ratios.The results showed that BRA and SBS markedly strengthened the high-temperature performance of asphalt.As BRA content increased,fatigue resistance improved gradually,while low-temperature performance first climbed then declined.SBS dosage had little effect on either low-temperature and fatigue behavior.The BRA-SBS interaction governed high-temperature deformation resistance.BRA together with C9 resin controlled low-temperature ductility and fatigue resistance.The combined effect of SBS and C9 dominated resistance to permanent deformation at elevated temperatures.The relative error between predicted and measured values for the optimum blend was within 5%,confirming high model accuracy.Future work can refine the weighting of these indicators to suit varying road conditions.
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基金资助
陕西省交通运输厅交通科研项目(23-80X)
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