基于原子力显微技术的混合料中沥青微尺度性能测试方法
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摘要
以沥青混合料试件为研究对象,探讨了原子力显微样本的制备方法.选取最大纵向起伏度和表面粗糙度两个指标对不同储存条件下的样本制备效果进行评定,提出采用低温冷冻措施保证AFM(atomic force microscope)样本平整度的制样方法;利用原子力显微技术的力学性能量化模块AFMQNM(atomic force microscope-quantitative nano mechanical),选取沥青胶浆区域3个典型的观测区域,进行原子力显微测试及微尺度力学性能量化表征.研究结果表明,"冷冻保存、低温切割"的混合料试件样本制备方法能够满足AFM技术的观测要求;AFM-QNM技术可以在混合料试件中直接测试沥青(胶浆)和矿质集料的模量和黏附性质,可有效区分不同的材料组分.
The mixture specimen was selected as the research object and the preparation method of samples using atomic force microscopy were discussed.The maximum longitudinal distance and surface roughness of the sample surface were applied to evaluate samples in different storage conditions.The freezing method at lower temperature was recommended to ensure the flattnesss of sample surface.Then three areas in asphalt-mineral filler mastic of mixtures surface were investigated using the function of quantitative Nano mechanical of atomic force microscopy(AFM-QNM).The results show that the sample with freezing preservation and low temperature cutting could ensure the flatness of mixture samples,which meets the demand of AFM observation.The technology of AFM-QNM can directly measure the microscale mechanic modulus and adhesion properties in mixture and effectively distinguish different material components.This study could provide a new idea for in-situ evaluating aging degree of RAP asphalts.
The mixture specimen was selected as the research object and the preparation method of samples using atomic force microscopy were discussed.The maximum longitudinal distance and surface roughness of the sample surface were applied to evaluate samples in different storage conditions.The freezing method at lower temperature was recommended to ensure the flattnesss of sample surface.Then three areas in asphalt-mineral filler mastic of mixtures surface were investigated using the function of quantitative Nano mechanical of atomic force microscopy(AFM-QNM).The results show that the sample with freezing preservation and low temperature cutting could ensure the flatness of mixture samples,which meets the demand of AFM observation.The technology of AFM-QNM can directly measure the microscale mechanic modulus and adhesion properties in mixture and effectively distinguish different material components.This study could provide a new idea for in-situ evaluating aging degree of RAP asphalts.
引文
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[10]NAHAR S N,SCHMETS A J M,SCHLANGEN E,et al.Turning back time:rheological and microstructural assessment of rejuvenated bitumen[C/CD]∥93rd Annual Meeting Transportation Research Board.Washington D C:Transportation Research Board,2014.
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[12]DAS P K,KRINGOS N,BIRGISSON B.Microscale investigation of thin film surface ageing of bitumen[J].Journal of Microscopy,2014,254(2):95.
[13]FISCHER H,STADLER H,ERINA N.Quantitative temperature-depending mapping of mechanical properties of bitumen at the nanoscale using the AFM operated with PeakForce TappingTM mode[J].Journal of Microscopy,2013,250(3):210.
[2]贾贤.材料表面现代分析方法[M].北京:化学工业出版社,2010.JIA Xian.Modern methods of material surface analysis[M].Beijing:Chemical Industry Press,2010.
[3]杨序纲,杨潇.原子力显微术及其应用[M].北京:化学工业出版社,2011.YANG Xugang,YANG Xiao.Atomic force microscopy and its application[M].Beijing:Chemical Industry Press,2011.
[4]TAREFDER R,FAISAL H.Nanoindentation characterization of asphalt concrete aging[J].Journal of Nanomechanics and Micromechanics,2014,4(1):A4013003.
[5]YOUNG T J,MONCLUS M A,BURNETT T L,et al.The use of the PeakForceTM quantitative nanomechanical mapping AFM-based method for high-resolution Young's modulus measurement of polymers[J].Measurement Science and Technology,2011,22(12):125703.
[6]NAHAR S N,SCHMETS A J M,SCHITTER G,et al.Quantitative nanomechanical property mapping of bitumen micro-phases by peak-force atomic force microscopy[C/CD]∥12th ISAP Conference on 30 Asphalt Pavements.[S.l.]:ISAP,2014.
[7]LOEBER L,SUTTON O,MOREL J,et al.New direct observations of asphalts and asphalt binders by scanning electron microscopy and atomic force microscopy[J].Journal of Microscopy,1996,182(1):32.
[8]LOEBER L,MULLER G,MOREL J,et al.Bitumen in colloid science:a chemical,structural and rheological approach[J].Fuel,1998,77(13):1443.
[9]NAHAR S N,SCHMETS A J M,SCARPAS A,et al.Temperature and thermal history dependence of the microstructure in bituminous materials[J].European Polymer Journal,2013,49(8):1964.
[10]NAHAR S N,SCHMETS A J M,SCHLANGEN E,et al.Turning back time:rheological and microstructural assessment of rejuvenated bitumen[C/CD]∥93rd Annual Meeting Transportation Research Board.Washington D C:Transportation Research Board,2014.
[11]龚明辉.基于原子力显微镜的沥青微观自愈机理研究和定量分析[D].南京:东南大学,2014.GONG Minghui.Research on micro-healing mechanism of asphalt with atomic force microscopy and quantative analysis[D].Nanjing:Southeast University,2014.
[12]DAS P K,KRINGOS N,BIRGISSON B.Microscale investigation of thin film surface ageing of bitumen[J].Journal of Microscopy,2014,254(2):95.
[13]FISCHER H,STADLER H,ERINA N.Quantitative temperature-depending mapping of mechanical properties of bitumen at the nanoscale using the AFM operated with PeakForce TappingTM mode[J].Journal of Microscopy,2013,250(3):210.