基于流变指标的胶粉复合改性沥青热氧老化程度评估
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摘要
本研究采用薄膜烘箱和压力老化仪对胶粉复合改性沥青进行不同程度的热氧老化,通过分析胶粉复合改性沥青的车辙因子、疲劳因子在不同热氧老化程度下的变化,探究热氧老化下流变指标与组分比的对应关系,建立了基于温度和流变指标的变化方程来计算组分比均值,并以YH-801 SBS和LG-501 SBS胶粉复合改性沥青验证该方程,表明采用该方程计算的组分比均值符合组分比的变化规律,这说明此方法评价热氧老化程度可行,可为胶粉复合改性沥青的再生提供依据。
To evaluate the aging degree of rubber compound modified asphalt more intuitively,TFOT(Thin Film Oven Test) and PAV(Pressure Aging Vessel) were used to simulate different degrees of thermal oxidative aging.The relationship between the changes of rheological indices(G*/sinδ and G*·sinδ) before and after aging as well as composition ratio were analyzed to establish the equation based on temperature and rheological index,which could be used to calculate the average value of composition ratio.And experiments were also conducted on YH-801 SBS and LG-501 SBS modified asphalt to verify this equation.Results indicated that the average value of composition ratio obtained by this equation accords well with the changing laws of composition ratio,suggesting that it is feasible to evaluate thermal oxidative aging degrees by this equation.It provides basic support for the quantitative evaluation before the regeneration of rubber compound modified asphalt.
To evaluate the aging degree of rubber compound modified asphalt more intuitively,TFOT(Thin Film Oven Test) and PAV(Pressure Aging Vessel) were used to simulate different degrees of thermal oxidative aging.The relationship between the changes of rheological indices(G*/sinδ and G*·sinδ) before and after aging as well as composition ratio were analyzed to establish the equation based on temperature and rheological index,which could be used to calculate the average value of composition ratio.And experiments were also conducted on YH-801 SBS and LG-501 SBS modified asphalt to verify this equation.Results indicated that the average value of composition ratio obtained by this equation accords well with the changing laws of composition ratio,suggesting that it is feasible to evaluate thermal oxidative aging degrees by this equation.It provides basic support for the quantitative evaluation before the regeneration of rubber compound modified asphalt.
引文
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[5]崔亚楠,邢永明,王岚,等.复合胶粉改性沥青的微观结构与流变特性[J].高分子材料科学与工程,2012,28(2):41~44.
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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.
[2]梁星敏,黄康旭,朱林.TLA掺量对湖沥青改性沥青高、低温性能的影响[J].材料科学与工程学报,2016,34(4):614~618.
[3] Zhang Lei,Xing Chao,Gao Fei,et al.Using DSR and MSCR Tests to Characterize High Temperature Performance of Different Rubber Modified Ssphalt[J].Construction and Building Materials,2016,127:466~474.
[4] Ramez A.Al-Mansob,Amiruddin Ismail, Nur Izzi Md.Yusoff,et al.Rheological Characteristics of Unaged and Aged Epoxidised Natural Rubber Modified Asphalt[J].Construction and Building Materials,2016,102:190~199.
[5]崔亚楠,邢永明,王岚,等.复合胶粉改性沥青的微观结构与流变特性[J].高分子材料科学与工程,2012,28(2):41~44.
[6]刘斌清,胡松山,谭华,等.沥青四组分与橡胶沥青性能指标的相关性分析[J].中外公路,2015,35(6):321~326.
[7]尹麒.SBS改性沥青热老化过程中四组分变化规律研究[J].化学工程与装备,2013,7:18~20.
[8]单宝龙,孙敬军,高会娟,等.四组分分析法研究老化改性沥青[J].当代化工,2013,42(6):743~745.
[9]陈改霞.沥青四组分分离试验装置及其影响因素研究[D].西安:长安大学,2014.
[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.