木屑液化产物合成的生物沥青性能及机理分析  

Performance and mechanism of bio-asphalt synthesized from wood liquefied products

作　　者：丁湛[1] 赵浚凯 蒋修明 栗培龙[2] DING Zhan;ZHAO Jun-kai;JIANG Xiu-ming;LI Pei-long(Experiment Center of Chemical Engineering and Biological Engineering,School of Environmental Science and Engineering,Chang'an University,Xi'an 710054,China;Key Laboratory of Road Structure&Material Ministry of Transport,Chang'an University,Xi'an 710054,China)

机构地区：[1]长安大学环境科学与工程学院化学工程与生物工程实验中心,陕西西安710054 [2]长安大学道路结构与材料交通行业重点实验室,陕西西安710054

出　　处：《广西大学学报（自然科学版）》2018年第4期1632-1639,共8页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(51108037);国家自然科学基金资助项目(51768062);陕西省自然科学基础研究计划项目(2017JM5099);交通运输部基础研究计划项目(2014319812151);中央高校创新团队培育项目(300102218405);中央高校重点科研平台水平提升项目(300102218513)

摘　　要：为促进废物利用及绿色道路材料开发,结合我国木质材料固体废弃物特性及生物沥青发展的需要,将杨木屑液化产物合成树脂,然后加入基质沥青制备生物沥青。分析了合成树脂掺量对生物沥青针入度、软化点、延度及黏度的影响,确定了合理的合成树脂掺量。并探讨了生物沥青的复数剪切模量、相位角、车辙因子在30~80℃温度范围内的变化规律;通过短期与长期老化试验,采用老化前后的针入度比、软化点增值、延度比、黏度老化指数指标分析了生物沥青的耐久性,并与基质沥青及SBS(5%)改性沥青进行对比分析。通过红外光谱分析,讨论了生物沥青的作用机理。结果表明,生物沥青中合成树脂的合理掺量为10%,该掺量的生物沥青复数剪切模量、相位角、车辙因子与SBS(5%)改性沥青较为接近,即生物沥青具有较优良的高温抗车辙性能;生物沥青抗长期老化能力与SBS改性沥青接近,远高于基质沥青。分析认为,生物沥青中的合成树脂可吸收沥青的轻组分使沥青质相互之间的距离缩小,从而改变沥青的黏度;合成树脂在生物沥青中可形成网络结构,提升其高温黏性及低温弹性;合成树脂与沥青交互作用,可增强沥青内部的黏聚力,进而提高了沥青的高温性能及抗老化性能。To promote the utilization of waste and the development of green road materials,according to the properties of wood waste and the requirement of bio-asphalt,wood chips were liquefied and made into synthetic resin.Then bio-asphalt was prepared by mixing the synthetic resin and base asphalt.The effect of synthetic resin content on the properties of the bio-asphalt such as penetration,softening point,ductility and viscosity,was analyzed.The reasonable content of synthetic resin in the bio-asphalt was recommended.The parameters of complex shear modulus,phase angle and rutting factor of the bio-asphalt,temperature of which ranged from 30 to 80℃were discussed.The thin film oven test(TFOT)and pressurized aging vessel(PAV)test were conducted,and the durability of the bio-asphalt was analyzed using the indexes of penetration ratio,softening point increment,ductility ratio and viscosity aging coefficient and compared with the base asphalt and SBS(5%)modified asphalt.And the mechanism was discussed by the infrared spectroscopic analysis.The results indicate that the reasonable content of synthetic resin is 10%in the bio-asphalt.The complex shear modulus,phase angle and rutting factor of the bio-asphalt are close to those of SBS(5%)modified asphalt,which shows good resistance to rutting of bio-asphalt in high temperature.The resistance to long-term aging of bio-asphalt is much better than that of base asphalt,but close to that of SBS(5%)modified asphalt.It indicates that synthetic resin in the bio-asphalt can absorb the light components of base asphalt to reduce the distance between the asphaltene,so the viscosity of asphalt changes.And the reticular structure forms in the bio-asphalt due to the synthetic resin,which improves the high temperature cohesion and low temperature elasticity.The cohesion of the bio-asphalt was promoted by the interaction of synthetic resin and base asphalt,which improves the high-temperature and anti-aging performances.

关 键 词：道路工程 生物沥青 合成树脂 高温性能 耐久性 作用机理 

分 类 号：U41[交通运输工程—道路与铁道工程]