考虑自愈补偿的再生沥青疲劳性能分析
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摘要
为研究自愈补偿对再生沥青疲劳性能的影响,通过动态剪切流变试验,对比分析了9种再生沥青在考虑自愈补偿前后的疲劳性能.采用动态剪切模量降低至初始值50%时的加载次数Nf50来评价再生沥青疲劳性能,采用疲劳寿命变化率HI来评价再生沥青的自愈合性能.结果表明:考虑自愈补偿前,各再生沥青疲劳寿命均与原沥青老化程度、应变大小呈反比,与再生剂掺量呈正比;考虑自愈补偿后,再生沥青疲劳寿命明显增长,间歇时间对疲劳寿命的增长有促进作用,应变大小对疲劳寿命衰减程度影响基本不变,再生剂掺量对疲劳寿命增长的影响显著.考虑自愈补偿前后,再生沥青的疲劳曲线存在明显差别,建议在研究沥青疲劳性能时应考虑自愈补偿的影响.
In order to study the influence of self-healing compensation on fatigue performance of regenerated asphalt,the fatigue performance of 9 kinds of regenerated asphalts was analyzed through dynamic shear rheology test.The fatigue behavior was evaluated by loading cycles when the dynamic shear modulus reduced to 50%of the initial value,and the self-healing behavior was evaluated by the changing rate of fatigue life.The results show that before considering self-healing compensation,fatigue life of regenerated asphalts is inversely proportional to the original asphalt aging degree and strain control value,while it is proportional to regenerator dosage.After considering self-healing compensation,the fatigue life of regenerated asphalts is obviously increased.Intermittent time plays a promoting role in increasing fatigue life.The influence of strain control value on fatigue life attenuation is basically unchanged.The effect of regenerator dosage on fatigue life growth is more significant.Fatigue curves of regenerated asphalts before and after considering the self-healing compensation are significantly different.It is suggested that regenerated asphalt fatigue performance should take the impact of self-healing compensation into consideration.
In order to study the influence of self-healing compensation on fatigue performance of regenerated asphalt,the fatigue performance of 9 kinds of regenerated asphalts was analyzed through dynamic shear rheology test.The fatigue behavior was evaluated by loading cycles when the dynamic shear modulus reduced to 50%of the initial value,and the self-healing behavior was evaluated by the changing rate of fatigue life.The results show that before considering self-healing compensation,fatigue life of regenerated asphalts is inversely proportional to the original asphalt aging degree and strain control value,while it is proportional to regenerator dosage.After considering self-healing compensation,the fatigue life of regenerated asphalts is obviously increased.Intermittent time plays a promoting role in increasing fatigue life.The influence of strain control value on fatigue life attenuation is basically unchanged.The effect of regenerator dosage on fatigue life growth is more significant.Fatigue curves of regenerated asphalts before and after considering the self-healing compensation are significantly different.It is suggested that regenerated asphalt fatigue performance should take the impact of self-healing compensation into consideration.
引文
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[2]孙大权,刘富良,林添坂,等.沥青胶浆疲劳寿命分析方法与预估方程[J].建筑材料学报,2016,19(1):100-104.SUN Daquan,LIU Fuliang,LIN Tianban,et al.Fatigue life evaluation method and prediction equation for asphalt mortars[J].Journal of Building Materials,2016,19(1):100-104.(in Chinese)
[3]董瑞琨,郑茂,黄卫东,等.考虑自愈合补偿的多种沥青混合料疲劳性能比较[J].中国公路学报,2015,28(5):87-92.DONG Ruikun,ZHENG Mao,HUANG Weidong,et al.Fatigue performance comparison of various kinds of asphalt mixtures with self-healing compensation considered[J].China Journal of Highway and Transport,2015,28(5):87-92.(in Chinese)
[4]黄卫东,林鹏,郑茂,等.SBS沥青混合料疲劳自愈合影响因素分析[J].建筑材料学报,2016,19(5):950-956.HUANG Weidong,LIN Peng,ZHENG Mao,et al.Analysis of the factors influencing fatigue self-healing performance of SBS modified asphalt mixture[J].Journal of Building Materials,2016,19(5):950-956.(in Chinese)
[5] ABU AL-RUB R K,DARABI M K,LITTLE D N,et al.A micro-damage healing model that improves prediction of fatigue life in asphalt mixes[J].International Journal of Engineering Science,2010,48(11):966-990.
[6] GARCIA A.Self-healing of open cracks in asphaltmastic[J].Fuel,2012,93(1):264-272.
[7] SHEN S H,CHIU H M,HUANG H.Characterization of fatigue and healing in asphalt binders[J].Journal of Materials in Civil Engineering,2010,22(9):846-852.
[8] SHEN Shihui,LU Xin.Fracture healing properties of asphaltic material under controlled damage[J].Journal of Materials in Civil Engineering,2014,26(2):275-282.
[9]孙艳娜,李立寒,汪于凯.沥青疲劳性能评价指标[J].西南交通大学学报,2014,49(6):1102-1107.SUN Yanna,LI Lihan,WANG Yukai.Evaluation parameter research of asphalt fatigue binder fatigue[J].Journal of Southwest Jiaotong University,2014,49(6):1102-1107.(in Chinese)
[10] LU Xin.Investigation of the fracture healing and mechanism of asphalt binders[D].Whashington,D.C.:Whashington State University,2013.