摘要
为揭示氧化锌/膨胀蛭石(ZnO/EVMT)复合材料改性剂组分协同增效作用及其对沥青老化行为的影响规律,以推动新型复合材料改性剂及其改性沥青材料的研究和应用,进而提高沥青路面的耐老化性能和延长路面服役寿命,采用均相沉淀法在相同工艺条件下制备了单一ZnO粒子、单一EVMT、单一ZnO粒子复配单一EVMT(ZnO+EVMT,成分比例与ZnO/EVMT复合材料一致)和ZnO/EVMT复合材料并探究了其组分间作用特征,然后从沥青的物理性能、流变性能、化学官能团指数和分子量等方面探明了ZnO/EVMT复合材料对沥青老化行为的影响规律。结果表明:采用均相沉淀法合成的ZnO/EVMT复合材料可实现ZnO粒子和EVMT在微纳米尺度上有序复合,组分间的相互作用削弱了ZnO粒子的团聚效应并提高了ZnO粒子的分散性及其与EVMT之间的均匀性;ZnO/EVMT复合材料的紫外光吸收能力优于ZnO+EVMT和EVMT;此外,ZnO/EVMT复合材料与沥青形成了剥离型相结构,且ZnO/EVMT改性沥青具有良好的储存稳定性。因此,ZnO/EVMT复合材料的微观结构及其改性沥青的基本性能分别优于单一组分和复配改性剂及其改性沥青,其组分具有协同增效作用。最终,ZnO/EVMT复合材料改性沥青在室内短期热氧老化、长期热氧老化和长期紫外老化后均表现出较低的物理和流变性能老化指数、生成了较少的含氧官能团产物以及更低的大分子含量,故ZnO/EVMT复合材料可有效延缓沥青的老化行为。
The purpose of this work was to reveal the synergistic effect of zinc oxide/expanded vermiculite(ZnO/EVMT)composite modifier,and its influence on retarding the aging behavior of asphalt;to promote research and application of new composite modifiers and corresponding asphalt pavement materials,and to improve the aging resistance and service life of asphalt pavements.First,single ZnO particles,single EVMT particles,a mixture of single ZnO and single EVMT particles(ZnO+EVMT,with the same component proportion as ZnO/EVMT composite material),and ZnO/EVMT composite were synthesized using the homogeneous precipitation method under the same preparation conditions,and their interaction characteristics were investigated.Then,the asphalt aging behavior retarded by ZnO/EVMT was revealed through evaluations of the physical properties index,rheological properties index,chemical functional group index,and molecular weight characteristics.The results show that the ZnO/EVMT composite synthesized by the homogeneous precipitation method could achieve the orderly combination of ZnO particles and EVMT at the micro-and nano-scale.Furthermore,the synergistic effect between the components of ZnO/EVMT can weaken the agglomeration of ZnO particles,and improve the dispersion of ZnO particles and their relative homogeneity with EVMT.Further,ZnO/EVMT presents higher ultraviolet light absorption capability than ZnO+EVMT and EVMT.With the introduction of ZnO/EVMT composite,the exfoliation phase structure can be formed by ZnO/EVMT and asphalt,and the ZnO/EVMT modified asphalt has good storage stability.Thus,the microstructure of the ZnO/EVMT composite and the basic properties of the modified asphalt are better than those of single component modifiers,the compound modifier,and the corresponding modified asphalt,indicating the component synergistic effect of the ZnO/EVMT composite.Therefore,the ZnO/EVMT modified asphalt exhibits lower physical and rheological properties aging indexes,less oxygen-containing functional group products,and lower large-size molecule content after laboratory short-term thermal-oxidative aging,long-term thermal-oxidative aging,and long-term ultraviolet aging.In conclusion,the ZnO/EVMT with the synergistic effects can effectively retard the aging behavior of asphalt.
作者
张恒龙
段海辉
罗尧
ZHANG Heng-long;DUAN Hai-hui;LUO Yao(College of Civil Engineering,Hunan University,Changsha 410082,Hunan,China;Key Laboratory for Green&.Advanced Civil Engineering Materials and Application Technology of Hunan Province,Hunan University,Changsha 410082,Hunan,China;Hunan Provincial Engineering Research Center for Construction Solid Wastes Recycling,Hunan Yunzhong Recycling Technology Co.Ltd.,Changsha 410205,Hunan,China)
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2024年第2期183-196,共14页
China Journal of Highway and Transport
基金
国家自然科学基金项目(52078209)。
关键词
路面工程
改性沥青
老化性能
氧化锌/膨胀蛭石复合材料
协同增效
pavement engineering
modified asphalt
asphalt aging property
zinc oxide/expanded vermiculite composite
synergetic effect
