蔗渣纤维乳化沥青吸附机制  

Emulsified Asphalt Adsorption Mechanism Research of Bagasse Fiber

作　　者：禤炜安 彭佳慧 张茂霖 杨宗昊 阳恩慧[1,4] 邱延峻 XUAN Weian;PENG Jiahui;ZHANG Maolin;YANG Zonghao;YANG Enhui;QIU Yanjun(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Guangxi Transportation Science and Technology Group Co.,Ltd.,Nanning 530007,China;Guangxi Key Lab of Road Structure and Materials,Nanning 530007,China;Highway Engineering Key Laboratory of Sichuan Province,Chengdu 610031,China)

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]广西交科集团有限公司,南宁530007 [3]广西道路结构与材料重点实验室,南宁530007 [4]道路工程四川省重点实验室,成都610031

出　　处：《北京工业大学学报》2024年第10期1219-1227,共9页Journal of Beijing University of Technology

基　　金：南宁市优秀青年科技创新创业人才培育资助项目(RC20200203);中央引导地方科技发展资金资助项目(桂科ZY21195043)。

摘　　要：为了探索蔗渣纤维与沥青吸附机制的问题,通过BET(Brunauer-Emmet-Teller, BET)比表面积检测法、挂篮吸附实验以及棒状薄层色谱-氢火焰离子探测实验(thin-layer chromatography with flame ionization detection, TLC-FID),研究改性前后蔗渣纤维的孔隙结构特性、改性蔗渣纤维对沥青组分的吸附性能的影响,以及不同改性蔗渣纤维掺量对吸附过程的影响,并结合吸附动力学模型进行理论验证分析吸附机理。实验结果表明:蔗渣纤维具有大孔与狭缝孔结构,改性后蔗渣纤维的表面积略有增加,总孔体积、微孔面积与体积增加幅度较大,分别达到241%、170%和276%;达到吸附平衡后,饱和分质量分数降低5.77%、芳香分质量分数增加20.75%、胶质质量分数降低29.37%,以及沥青质质量分数降低5.66%,说明改性蔗渣纤维最易吸附的沥青组分为胶质;随着改性蔗渣纤维掺量的增加,吸附率从15.25%增加至34.16%,而单位平衡吸附量从4.827减小至2.162;实验采用准一级、准二级吸附动力学模型,其中准二级动力学模型拟合效果更好,模型预测单位平衡吸附量q_e(3.247)更接近实验测得的q_e(3.098);胶质的吸附过程是由外向内的,驱动力不足以及吸附点位的数量影响使得吸附达到平衡。To explore the adsorption mechanism of bagasse fiber and asphalt,Bruner-Emmet-Teller(BET)specific surface area detection method,basket adsorption test and rod-like thin-layer chromatography with flame ionization were used for detection(TLC-FID),the pore structure characteristics of bagasse fiber before and after modification,the easier adsorption of certain components in asphalt by modified bagasse fiber,and the influence of different modified bagasse fiber content on the adsorption process are studied,and the adsorption mechanism is analyzed by theoretical verification combined with adsorption kinetics model.Results show that the surface area of bagasse fiber increases slightly after modification,and the total pore volume,micropore area and volume increase significantly,reaching 241%,170%and 276%,respectively.After reaching the adsorption equilibrium,the saturated mass fraction decreases by 5.77%,the aromatic mass fraction increases by 20.75%,the gum mass fraction decrease by 29.37%,and the asphaltene mass fraction decreases by 5.66%.With the increase of the content of modified bagasse fiber,the adsorption rate increases from 15.25%to 34.16%and the unit equilibrium adsorption decreases from 4.827 to 2.162.The quasi-first-order and quasi-second-order adsorption kinetic models were used in the experiment.The quasi-second-order kinetic model has better fitting effect,and the unit equilibrium adsorption quantity qe(3.247)predicted by the model is closer to the unit equilibrium adsorption quantity qe(3.098)measured by the experiment.The adsorption process of colloid is from the outside to the inside,the insufficient driving force and the number of adsorption sites allows the adsorption to reach a balance.

关 键 词：蔗渣纤维 纤维改性 BET比表面积检测法 棒状薄层色谱 沥青四组分 吸附动力学模型 

分 类 号：U461[机械工程—车辆工程] TP308[交通运输工程—载运工具运用工程]