BMH型温拌剂对废塑/SBS复合改性沥青疲劳性能的影响  

Effect of BMH type warm mixture on fatigue properties of waste plastic/SBS composite modified asphalt

作　　者：徐传浩 石振武[1] 池波 XU Chuanhao;SHI Zhenwu;CHI Bo(Faculty of Civil Engineering and Transportation,Northeast Forestry University,Harbin 150040,China;Longjian Road and Bridge Company Limited,Harbin 150009,China)

机构地区：[1]东北林业大学土木与交通学院,哈尔滨150040 [2]龙建路桥股份有限公司,哈尔滨150009

出　　处：《中国塑料》2024年第8期94-99,共6页China Plastics

基　　金：龙建路桥股份有限公司科技项目(230000100004258220004)。

摘　　要：借助动态剪切流变仪(DSR)温度扫描试验、时间扫描试验、线性振幅扫描试验以及红外试验对废塑/热塑性丁苯橡胶(SBS)复合改性沥青的抗疲劳性能进行了分析。结果显示:路陆邦(BMH)型温拌剂可以降低废塑/SBS改性沥青的疲劳因子,降低耗散能,提高抗疲劳性能,且以1.2%(质量分数,下同)的掺量表现最佳。归一化动态模量衰减至初始模量50%的指标值(N_(f50))和刚度比(S)×循环加载次数(N)均可以用来表征温拌废塑/SBS复合改性沥青的疲劳寿命,通过S×N指标来表征的疲劳寿命总体上低于N_(f50),1.2%掺量改善抗疲劳性能最优,1.4%掺量改善效果不升反降。BMH型温拌剂对于老化后沥青试样疲劳性能的改善效果更明显;无论是老化还是未老化的沥青试样,温拌剂的改善效果在高应变水平环境中更为突出;抗疲劳性能以1.2%掺量BMH型温拌剂样品最优。BMH型温拌剂能够通过降低羰基及亚砜基含量来提高沥青抗疲劳性能,对老化后的沥青提升效果更明显,这与线性振幅扫描试验结果一致。In this paper,the fatigue resistance of waste plastic/butadiene styrene block polymer(SBS)composite modified as⁃phalt was analyzed by temperature scanning test,time scan test,linear amplitude scanning test and infrared test using a dy⁃namic shear rheometer.The results indicated that BMH warm mixture could reduce the fatigue factor,reduce the dissipation energy,and improve the fatigue resistance of waste plastic/SBS modified asphalt,and the best performance was at a content of 1.2 wt%.Both normalized dynamic modulus decays to an index value of 50%of the initial modulus and stiffness ratio(S)×times of cyclic loading(N)can be used to characterize the fatigue life of warm⁃mix waste plastic/SBS composite modi⁃fied asphalt,and the fatigue life characterized by S×N index was generally lower than that of N_(f50),the fatigue resistance im⁃proved by 1.2 wt%content was the best,and the improvement effect of 1.4 wt%content did not increase but decreased.BMH warm mix had a more obvious effect on the fatigue performance of aging asphalt samples.Regardless of whether it is an aged asphalt sample or an unaged asphalt sample,the improvement effect of warm mix was more prominent in the envi⁃ronment with high strain level.The fatigue resistance of 1.2 wt%BMH mixture sample was the best.BMH warm mix could improve the fatigue resistance of asphalt by reducing the content of carbonyl and sulfoxide groups,and the effect on the aging asphalt was more obvious,which was consistent with the test results of linear amplitude scanning.

关 键 词：废塑/热塑性丁苯橡胶复合改性沥青 温拌技术 时间扫描 线性振幅扫描 疲劳性能 

分 类 号：TQ320.9[化学工程—合成树脂塑料工业]