SBS改性沥青老化特性及模拟老化试验方法研究
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摘要
为了给SBS改性沥青老化性能评价提供试验依据,指导再生沥青路面工程实践,采取薄膜烘箱(TFOT)在163℃高温下,对SBS改性沥青进行不同时间的高温加热模拟老化,对不同老化程度的SBS改性沥青进行研究,试验研究其常规性能指标和高温动态剪切流变性能指标随模拟老化时间的变化规律,并回归拟合这些指标与模拟老化时间的关系,通过复核性试验对比分析模拟老化沥青与现场回收旧沥青的性能指标。结果表明,随着老化时间的延长,SBS改性沥青的针入度下降,延度减小,粘度增大,抗车辙因子显著增大,沥青流动性能降低,高温性能增强。而由于老化中SBS改性剂的降解作用,沥青的软化点变化规律性不强。除了软化点之外,其它指标与老化时间具有良好的相关性,由此确定基于TFOT的模拟老化试验方法。通过模拟老化沥青与现场回收旧沥青的性能指标的对比,验证了模拟老化试验方法的合理性。
In order to provide experimental basis for evaluating the aging properties of SBS modified asphalt,guiding the engineering practice of recycled asphalt pavement,a thin film oven test( TFOT) was used at high temperature at 163 ℃ to simulate aging of SBS modified asphalt at different heating time. For the SBS modified asphalt with different aging degree,the change rule of conventional performance index and high temperature dynamic shear rheological property with simulated aging time are studied,at the same time, the relationship between these indexes and simulated aging time is regressively fitted. Lastly,the performance indexes of simulated aging asphalt and recycled old asphalt on the site are compared and analyzed by reviewing tests. The results show that the penetration of SBS modified asphalt decreased,the ductility decreased,the viscosity increased,the anti rutting factor increased significantly,the asphalt flow performance decreased,and the high temperature performance was enhanced with the prolongation of aging time. However,due to the degradation of SBS modifier in aging,the softening point of asphalt is not changing regularly. In addition to softening point,other indicators have a good correlation with aging time,and the simulated aging test method based on TFOT is determined. The rationality of simulated aging test method is verified by comparing the performance indexes between simulated aging asphalt and recycled old asphalt on the site.
In order to provide experimental basis for evaluating the aging properties of SBS modified asphalt,guiding the engineering practice of recycled asphalt pavement,a thin film oven test( TFOT) was used at high temperature at 163 ℃ to simulate aging of SBS modified asphalt at different heating time. For the SBS modified asphalt with different aging degree,the change rule of conventional performance index and high temperature dynamic shear rheological property with simulated aging time are studied,at the same time, the relationship between these indexes and simulated aging time is regressively fitted. Lastly,the performance indexes of simulated aging asphalt and recycled old asphalt on the site are compared and analyzed by reviewing tests. The results show that the penetration of SBS modified asphalt decreased,the ductility decreased,the viscosity increased,the anti rutting factor increased significantly,the asphalt flow performance decreased,and the high temperature performance was enhanced with the prolongation of aging time. However,due to the degradation of SBS modifier in aging,the softening point of asphalt is not changing regularly. In addition to softening point,other indicators have a good correlation with aging time,and the simulated aging test method based on TFOT is determined. The rationality of simulated aging test method is verified by comparing the performance indexes between simulated aging asphalt and recycled old asphalt on the site.
引文
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[10] JTG E20—2011.公路工程沥青及沥青混合料试验规程[S].
[11]孙宁.厂拌热再生SBS改性沥青路面旧沥青再生效果研究[D].长沙:长沙理工大学,2017.
[2]董瑞混,孙立军.考虑老化的沥青结合料低温感温性指标[J].中国公路学报,2006,19(4):34-39.
[3]李宁利,赵新坡,李铁虎,等.复合改性沥青的抗老化性能研究[J].河北工业大学学报,2010,39(6):108-112.
[4]田小革,郑健龙,张起森.老化对沥青结合料粘弹性的影响[J].交通运输工程学报,2004,4(1):3-6.
[5] Huang S. C.,Glaser Ron,Turner Fred. Impact of Water on Asphalt Aging[J]. TransportationResearch Record,2012,2,293:63-72.
[6]张争奇,梁晓莉,李平.沥青老化性能评价方法[J].交通运输工程学报,2005,5(1):1-5.
[7]纪小平,侯月琴,郑南翔.沥青热氧老化的非线性预测[J].长安大学学报,2009,29(4):13-15,38.
[8] Apeagyei A. K.. Laboratory Evaluationof Antioxidants for Asphalt Binders[J]. Construction and Building Materials,2011,25(1):47-53.
[9]栗培龙.道路沥青老化行为与机理研究[D].西安:长安大学,2007.
[10] JTG E20—2011.公路工程沥青及沥青混合料试验规程[S].
[11]孙宁.厂拌热再生SBS改性沥青路面旧沥青再生效果研究[D].长沙:长沙理工大学,2017.