SBS改性生物沥青结合料高温流变特性  

High Temperature Rheological Properties on SBS Modified Bio-binder

作　　者：高俊锋[1] 汪海年[1] 尤占平[1,2] 雷勇 GAO Junfeng;WANG Hainian;YOU Zhanping;LEI Yong(Road Structure and Materials Key Laboratory for Transportation,Chang′an University,Xi′an,China,710064;Department of Civil and Environmental Engineering,Michigan Technological University,Houghton,USA,49931)

机构地区：[1]长安大学道路结构与材料交通行业重点实验室,陕西西安710064 [2]密歇根理工大学土木工程与环境学院,美国霍顿49931

出　　处：《沈阳建筑大学学报（自然科学版）》2018年第2期293-302,共10页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51578075);交通运输部应用基础研究项目(2014319812180)

摘　　要：目的分析以木屑为原材料获取的生物质重油与基质沥青混溶制备的改性生物沥青的高温流变特性,寻求可替代石油沥青的再生材料.方法采用布氏黏度仪(RV)和动态剪切流变仪(DSR),探究不同生物质重油掺量、不同温度下,SBS改性生物沥青的黏度、车辙因子、相位角和复数模量的变化情况,分析SBS改性生物沥青S110的拌和与压实温度的确定问题.通过重复蠕变恢复试验(RCRT),研究应力水平、作用次数对蠕变劲度的黏性成分和累积应变的影响.结果生物质重油掺量不大于10%时,随着生物质重油掺量的增加,生物沥青的高温性能有所降低;掺量大于10%时,老化作用使得其高温性能增加.生物质重油的加入使得改性生物沥青的黏度有一定程度的下降,且在生物质重油掺量不大于10%时,其黏度较基质沥青的黏度有所提高,对其黏附性有一定的改善作用.应力水平对生物沥青的黏性性能影响较小,但对其累积应变的影响显著.结论通过试验得到了改性生物沥青结合料高温流变特性的变化规律,为进一步研究与工程实践提供了数据支持.To analyze the high temperature rheological properties of modified bio-asphalt prepared by mixing matrix asphalt and bio-oil extracted from sawdust,and to seek alternative materials for petroleum asphalt.The variations of viscosity,rutting factor,phase angle and complex modulus under different contents of bio-oil and different temperatures were tested by rotational viscometer(RV)and dynamic shear rheometer(DSR).The ascertaining of mixing and compaction temperature were analyzed.The effect of stress level and action times on the viscous component of creep stiffness and the cumulative strain was studied through repeated creep recovery test(RCRT).The results showed that,when the content of bio-oil is less than 10%,the high temperature performance of bio-binder decreases with the increase of bio-oil content.When the dosage is more than 10%,the aging effect increases.The addition of bio-oil could make the viscosity of modified bio-asphalt have a certain degree of decline,and the viscosity of the bio-binder is higher than base asphalt.The effect of stress level on the viscous properties of bio-asphalt is small,but its effect on the cumulative strain is significant.The change laws of the rheological properties of modified bio-asphalt were obtained through the experiments,which provides the data support for further research and engineering practice.

关 键 词：改性沥青 生物质重油 结合料 流变特性 室内试验 

分 类 号：TU535[建筑科学—建筑技术科学] U414[交通运输工程—道路与铁道工程]