用于排水沥青路面的高黏度改性沥青的制备及性能  

Preparation and performance of high-viscosity modified asphalt for drainage asphalt pavement

作　　者：张增平[1] 陈俐企 黄婷 班孝义 刘浩 ZHANG Zeng-ping;CHEN Li-qi;HUANG Ting;BAN Xiao-yi;LIU Hao(Key Laboratory for Special Area Highway Engineering of Ministry of Education,Chang'an University,Xi'an 710064,Shaanxi,China)

机构地区：[1]长安大学教育部特殊地区公路工程重点实验室,陕西西安710064

出　　处：《长安大学学报（自然科学版）》2023年第1期1-9,共9页Journal of Chang’an University(Natural Science Edition)

基　　金：北京市重点实验室开放课题项目(QETHSP2020003)。

摘　　要：为制备出适用于排水沥青路面的高黏度改性沥青,并降低使用成本,运用熔融共混工艺,将苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)、天然增黏树脂(TR)以及少量增塑剂混炼得到新型热塑性高黏度改性剂(N-HVM),用其制备新型高黏度改性沥青(N-HVA),并对其改性效果进行研究。选用传统TPS-HVA、SINOTPS-HVA作为对照组进行对比分析。首先通过针入度、软化点、5℃延度、60℃动力黏度、135℃布氏黏度、弹性恢复试验研究不同N-HVM掺量对沥青常规物理性能的影响,确定出N-HVM的最佳掺量范围;其次通过黏度试验分析高黏度改性沥青的黏流特性,借助傅里叶变换红外光谱(FTIR)试验、差示扫描量热(DSC)试验探析高黏度改性沥青的改性机理;最后利用动态剪切流变(DSR)试验和弯曲梁流变(BBR)试验评价高黏度改性沥青的高低温流变性能。试验结果表明:N-HVM最佳掺量(质量分数,下同)范围为14%~18.5%,制备的高黏度改性沥青常规物理性能满足规范要求。N-HVM的成本仅为市售高黏改性剂TPS、SINOTPS的30.8%、67.1%,能够显著降低高黏度改性沥青的使用成本。基质沥青与N-HVM共混过程中既存在物理改性,同时伴随有化学反应的发生。N-HVA的黏流活化能Eη小于TPS-HVA、SINOTPS-HVA,具有更好的温度稳定性及施工和易性。相比于TPS和SINOTPS,N-HVM对沥青的高低温性能改善效果更为显著,改性后的沥青具有优异的高温抗车辙性能和低温柔韧性。To prepare a high-viscosity modifier for drainage asphalt pavements and reduce the preparation cost,a new high-viscosity modifier(N-HVM)was obtained by blending styrenebutadiene-styrene block copolymer(SBS),terpene resin(TR),and a small amount of plasticizer using melt blending process,the new high-viscosity asphalt(N-HVA)was prepared,and the modification effect was studied.Traditional TPS-HVA and SINOTPS-HVA were selected as the control group for comparative analysis.Firstly,the effects of different N-HVM dosing on the general physical properties of asphalt were investigated by needle penetration,softening point,5℃ductility,60℃dynamic viscosity,135℃Brookfield viscosity,and elastic recovery tests,the optimal dosing range of N-HVM was clarified.Secondly,the viscous-flow characteristics of high-viscosity modified asphalt were analyzed by viscosity test,and the modification mechanism of high-viscosity modified asphalt was analyzed by means of Fourier transform infrared spectroscopy(FTIR)test and differential scanning calorimetry(DSC)test.Finally,the dynamic shear rheology(DSR)and bending beam rheology(BBR)tests were used,to evaluate the high and low-temperature rheological properties of high-viscosity modified asphalt.The results show that the optimum N-HVM dosage(mass fraction,the same below)range from 14%to 18.5%,and the conventional physical properties of the prepared high-viscosity modified asphalt meet the specification requirements.The cost of N-HVM is only 30.8%and 67.1%of commercially available high-viscosity modifiers TPS and SINOTPS,which can significantly reduce the cost of using high-viscosity modified asphalt.Both physical modifications and chemical reactions occur during the blending process of base asphalt with N-HVM.The viscous flow activation energy Eηof N-HVA is smaller than TPS-HVA and SINOTPS-HVA,which has better temperature stability and construction ease.Compared with TPS and SINOTPS,N-HVM has a more significant effect on the high and low-temperature performance improvement of asphalt,an

关 键 词：道路工程 高黏度改性剂 改性机理 流变性能 高黏度改性沥青 

分 类 号：U414[交通运输工程—道路与铁道工程]