再生沥青微观结构对流变性能的影响
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摘要
为揭示再生沥青的再生机理及效果,基于灰熵关联分析法,结合傅里叶变换红外光谱(FTIR)、电镜扫描(SEM)和动态剪切流变(DSR)测试,探讨了老化与再生沥青流变特性参数和特征官能团含量的变化情况及关联程度,并对其微观形貌进行表征对比.研究结果表明:沥青老化后,FTIR谱图中C=O基团与S=O基团指数明显增大,芳香分和非对称脂肪族化物指数含量减少;添加再生剂后,再生沥青的特征官能团含量变化与老化沥青呈相反趋势;复数模量降低,相位角升高;温度是影响沥青抗车辙性能和抗疲劳性的重要因素,抗车辙因子和疲劳因子均随温度的升高呈现幂指数衰减形式.沥青老化后微观特征由光滑形貌向密集褶皱转变,加入再生剂后基本恢复至光滑形貌.基于灰熵关联分析得出:再生沥青化学组分变化对高温流变特性参数影响程度,由大到小的排序依次为羰基、亚砜基、芳香族化合物、非对称脂肪族化合物.
In order to deeply study the reclaim mechanism of asphalt,it is expected to provide effective measures for the reclaim of asphalt binder.The changes of rheological property parameters and characteristic functional group content of aging and reclaimed asphalt and their correlation degree,micromorphology were discussed based on grey entropy correlation analysis,combined with Fourier transform infrared spectroscopy(FTIR), dynamic shear rheology(DSR) and scanning electron microscopy(SEM) testing techniques. The results show that the C=O group and the S=O group index of asphalt increase significantly in the FTIR spectrum after asphalt aging.However, the aromatic content and the asymmetric aliphatic group content are reduced. After the addition of the rejuvenator,the change in the characteristic functional group content of the reclaimed asphalt is opposite to that of the aged asphalt. After adding the rejuvenator to the aged asphalt, the value of complex modulus decrease and the phase angle increase. Anti-rutting factors and fatigue factors exhibit a power exponential decay trend with the changes of temperature.Temperature is an important factor affecting the anti-rutting performance and fatigue resistance of asphalt.After the aging of the asphalt,the microstructure characteristics change from smooth to dense folds,and after the addition of the regenerant,the basic shape is restored to a smooth appearance. Based on the grey entropy correlation analysis, it can be concluded that the degree of influence of chemical composition change of reclaimed asphalt on high temperature rheological parameters is as follows,carbonyl,sulfoxide group,aromatic compounds,asymmetric aliphatic.
In order to deeply study the reclaim mechanism of asphalt,it is expected to provide effective measures for the reclaim of asphalt binder.The changes of rheological property parameters and characteristic functional group content of aging and reclaimed asphalt and their correlation degree,micromorphology were discussed based on grey entropy correlation analysis,combined with Fourier transform infrared spectroscopy(FTIR), dynamic shear rheology(DSR) and scanning electron microscopy(SEM) testing techniques. The results show that the C=O group and the S=O group index of asphalt increase significantly in the FTIR spectrum after asphalt aging.However, the aromatic content and the asymmetric aliphatic group content are reduced. After the addition of the rejuvenator,the change in the characteristic functional group content of the reclaimed asphalt is opposite to that of the aged asphalt. After adding the rejuvenator to the aged asphalt, the value of complex modulus decrease and the phase angle increase. Anti-rutting factors and fatigue factors exhibit a power exponential decay trend with the changes of temperature.Temperature is an important factor affecting the anti-rutting performance and fatigue resistance of asphalt.After the aging of the asphalt,the microstructure characteristics change from smooth to dense folds,and after the addition of the regenerant,the basic shape is restored to a smooth appearance. Based on the grey entropy correlation analysis, it can be concluded that the degree of influence of chemical composition change of reclaimed asphalt on high temperature rheological parameters is as follows,carbonyl,sulfoxide group,aromatic compounds,asymmetric aliphatic.
引文
[1]李晓民,魏定邦,姚志杰,等.再生剂对老化沥青流变性能和微观结构的影响研究[J].建筑材料学报,2018(6):992-999.
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[10]陈华鑫,陈拴发,王秉纲.基质沥青老化行为与老化机理[J].山东大学学报:工学版,2009,39(2):125-130.
[11]耿九光.沥青老化机理及再生技术研究[D].西安:长安大学图书馆,2009.
[12]NIAN T F,LI P,MAO Y,et al.Connections between chemical composition and rheology of aged base asphalt binders during repeated freeze-thaw cycles[J].Construction and Building Materials,2018,159:338-350.
[13]邓聚龙.灰色预测与决策[M].武汉:华中理工大学出版社,1989.
[14]念腾飞,李萍,林梅.冻融循环下沥青特征官能团含量与流变参数灰熵分析及微观形貌[J].吉林大学学报:工学版,2018,48(4):1045-1054.
[15]李萍,念腾飞,魏定邦,等.FTIR定量分析方法与老化沥青流变参数新探[J].华中科技大学学报:自然科学版,2018,46(2):34-39.
[16]CORTIZO M S,LARSEN D O,BIANCHETTO H,et al.Effect if the thermal degradation of SBS copolymers during the ageing of modified asphalts[J].Polymer Degradation and Stability,2004,86(2):275-282.
[17]YILDIRIM Y.Polymer modified asphalt bindes[J].Construction and Building Materials,2007,21(1):66-72.
[2]丁捷.道路沥青五次老化再生微观分析[D].湘潭:湖南科技大学图书馆,2015.
[3]MARSAC P,ERARD N,POROT L,et al.Potential and limits of FTIR methods for reclaimed asphal characterrization[J].Materials and Structures,2014,47(8):1273-1286.
[4]ELKASHEF M,WILLIAMS R C,COCHRAN E W.Physi cal and chemical characterization of rejuvenated reclaimed asphalt pavement(RAP)binders using rheology testing and pyrolysis gas chromatography-mass spectrometry[J].Materials and Structures,2018,51(1):12-19.
[5]ELKASHEF M,WILLIAMS R C.Improving fatigue and low temperature performance of 100%RAP mixtures using a soybean-derived rejuvenator[J].Construction and Building Materials,2017,151:345-352.
[6]OLDHAM D,HUNG A,PARAST M M,et al.Investigating bitumen rejuvenation mechanisms using a coupled rheometry-morphology characterization approach[J].Construction and Building Materials,2018,159:37-45.
[7]YU X,ZAUMANIS M,DOS SANTOS S,et al.Rheological,microscopic,and chemical characterization of the rejuvenating effect on asphalt binders[J].Fuel,2014,135:162-171.
[8]POULIKAKOS L D,DOS SANTOS S,BUENO M,et al.Influence of short and long term aging on chemical,microstructural and macro-mechanical properties of recycled asphalt mixtures[J].Construction and Building Materials,2014,51:414-423.
[9]CAVALLI M C,ZAUMANIS M,MAZZA E,et al.Effect of ageing on the mechanical and chemical properties of binder from RAP treated with bio-based rejuvenators[J].Composites:Engineering,2018,141:174-181.
[10]陈华鑫,陈拴发,王秉纲.基质沥青老化行为与老化机理[J].山东大学学报:工学版,2009,39(2):125-130.
[11]耿九光.沥青老化机理及再生技术研究[D].西安:长安大学图书馆,2009.
[12]NIAN T F,LI P,MAO Y,et al.Connections between chemical composition and rheology of aged base asphalt binders during repeated freeze-thaw cycles[J].Construction and Building Materials,2018,159:338-350.
[13]邓聚龙.灰色预测与决策[M].武汉:华中理工大学出版社,1989.
[14]念腾飞,李萍,林梅.冻融循环下沥青特征官能团含量与流变参数灰熵分析及微观形貌[J].吉林大学学报:工学版,2018,48(4):1045-1054.
[15]李萍,念腾飞,魏定邦,等.FTIR定量分析方法与老化沥青流变参数新探[J].华中科技大学学报:自然科学版,2018,46(2):34-39.
[16]CORTIZO M S,LARSEN D O,BIANCHETTO H,et al.Effect if the thermal degradation of SBS copolymers during the ageing of modified asphalts[J].Polymer Degradation and Stability,2004,86(2):275-282.
[17]YILDIRIM Y.Polymer modified asphalt bindes[J].Construction and Building Materials,2007,21(1):66-72.