垂直振动成型冷再生混合料疲劳特性研究
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摘要
为深入研究乳化沥青冷再生混合料的疲劳特性,采用更符合混合料现场压实工况的垂直振动法成型圆柱体试件.研究了RAP掺量、成型方法及浸水环境对冷再生混合料疲劳特性的影响,应用Weibull分布建立冷再生混合料疲劳方程,并借助扫描电镜揭示了冷再生的疲劳抗裂机理.结果表明:新集料掺量对冷再生混合料疲劳性能有显著影响,疲劳性能随新集料掺量的增加呈抛物线变化趋势,当新集料掺量为20%时抗疲劳性能最优;垂直振动法设计冷再生混合料在应力作用下的抗疲劳性能及对应力变化敏感性优于马歇尔法;与未浸水试件相比,不同应力水平下浸水试件的疲劳寿命均缩短,对应力变化更加敏感;水泥-乳化沥青胶浆相互渗透胶结,并将集料紧密黏结,形成较致密的网状结构,有效改善胶浆与集料的界面协调变形,延缓裂缝发展.
In order to study the fatigue characteristics of the emulsified asphalt cold recycled mixture, the cylindrical test piece was formed by the vertical vibration method which was more in line with the compaction conditions of the mixture. The effects of reclaimed asphalt pavement material(RAP) content, forming method and water immersion environment on the fatigue characteristics of cold recycled mixture were studied. The fatigue equation of cold recycled mixture was established by Weibull distribution, and the fatigue anti-cracking mechanism of cold recycle was revealed by scanning electron microscopy. The results show that the new aggregate content has a significant effect on the fatigue performance of the cold recycled mixture. The fatigue performance shows a parabolic trend with the increase of the new aggregate content. When the new aggregate content is 20%, the fatigue performance is optimal. The cold recycled mixtures designed by vertical vibration method have better fatigue resistance and stress sensitivity than the Marshall method under stress. Compared with the un-immersed test piece, the fatigue life of the immersed test piece under different stress levels decreases, and is more sensitive to stress changes; cement-emulsified asphalt cement interpenetrates and cements, and the aggregates are tightly bonded to form a denser network structure, which effectively improves the interface deformation coordination of the cement and aggregate, and delays the development of cracks.
In order to study the fatigue characteristics of the emulsified asphalt cold recycled mixture, the cylindrical test piece was formed by the vertical vibration method which was more in line with the compaction conditions of the mixture. The effects of reclaimed asphalt pavement material(RAP) content, forming method and water immersion environment on the fatigue characteristics of cold recycled mixture were studied. The fatigue equation of cold recycled mixture was established by Weibull distribution, and the fatigue anti-cracking mechanism of cold recycle was revealed by scanning electron microscopy. The results show that the new aggregate content has a significant effect on the fatigue performance of the cold recycled mixture. The fatigue performance shows a parabolic trend with the increase of the new aggregate content. When the new aggregate content is 20%, the fatigue performance is optimal. The cold recycled mixtures designed by vertical vibration method have better fatigue resistance and stress sensitivity than the Marshall method under stress. Compared with the un-immersed test piece, the fatigue life of the immersed test piece under different stress levels decreases, and is more sensitive to stress changes; cement-emulsified asphalt cement interpenetrates and cements, and the aggregates are tightly bonded to form a denser network structure, which effectively improves the interface deformation coordination of the cement and aggregate, and delays the development of cracks.
引文
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[9] 汪德才,郝培文,魏新来.乳化沥青冷再生混合料疲劳性能及影响因素 [J].北京工业大学学报,2016,42(4):541-546.WANG Decai,HAO Peiwen,WEI Xinlai.Fatigue properties and influencing factors of emulsified asphalt cold recycled mixture [J].Journal of Beijing University of Technology,2016,42(4):541-546.(in Chinese)
[10] 蒋应军,韩占闯.级配对乳化沥青冷再生混合料路用性能影响 [J].大连理工大学学报,2018,58(6):607-614.JIANG Yingjun,HAN Zhanchuang.Influence of gradation on pavement performance of emulsified asphalt cold regenerated mixture [J].Journal of Dalian University of Technology,2018,58(6):607-614.(in Chinese)
[11] 张明杰,祁文洋.铣刨工艺对RAP变异性和级配的影响 [J].石油沥青,2016,30(4):12-17.ZHANG Mingjie,QI Wenyang.Effect of milling process on RAP variability and gradation [J].Petroleum Asphalt,2016,30(4):12-17.(in Chinese)
[12] 蒋应军,曹帆,陈浙江,等.垂直振动成型水泥稳定碎石疲劳特性及应用 [J].长安大学学报(自然科学版),2014,34(4):1-6.JIANG Yingjun,CAO Fan,CHEN Zhejiang,et al.Fatigue characteristics and application of vertical vibration forming cement stabilized macadam [J].Journal of Chang′an University (Natural Science Edition),2014,34(4):1-6.(in Chinese)
[13] 刘海鹏,蒋应军,胡永林,等.级配对乳化沥青冷再生混合料强度的影响 [J].建筑材料学报,2018,21(3):503-510.LIU Haipeng,JIANG Yingjun,HU Yonglin,et al.Influence of gradation on strength of emulsified asphalt cold recycled mixture [J].Journal of Building Materials,2018,21(3):503-510.(in Chinese)
[14] 蒋应军,赵占林,李明杰.两种方法设计沥青混合料的疲劳特性 [J].江苏大学学报(自然科学版),2016,37(4):473-478.JIANG Yingjun,ZHAO Zhanlin,LI Mingjie.Fatigue characteristics of asphalt mixture designed by two methods [J].Journal of Jiangsu University (Natural Science Edition),2016,37(4):473-478.(in Chinese)
[15] 吕政桦,申爱琴,覃潇,等.乳化沥青冷再生混合料性能优化及机理研究 [J].建筑材料学报,2018,21(4):614-619.Lü Zhenghua,SHEN Aiqin,QIN Xiao,et al.Study on performance optimization and mechanism of emulsified asphalt cold recycled mixture [J].Journal of Building Materials,2018,21(4):614-619.(in Chinese)
[2] AMERI M,BEHNOOD A.Laboratory studies to investigate the properties of CIR mixes containing steel slag as a substitute for virgin aggregates [J].Construction and Building Materials,2012,26(1):475-480.
[3] THANAYA I N A,ZOOROB S E,FORTH J P.A laboratory study on cold-mix,cold-lay emulsion mixtures [J].Proceedings of the Institution of Civil Engineers:Transport,2009,162(1):47-55.
[4] VISINTINE B,KHOSLA N P,TAYEBALI A.Effects of higher percentage of recycled asphalt pavement on pavement performance [J].Road Materials and Pavement Design,2013,14(2):432-437.
[5] KAVUSSI A,MODARRES A.Laboratory fatigue models for recycled mixes with bitumen emulsion and cement [J].Construction and Building Materials,2010,24(10):1920-1927.
[6] 孙立军,程怀磊,刘黎萍,等.在役乳化沥青冷再生混合料的疲劳性能 [J].同济大学学报(自然科学版),2017,45(11):1648-1654.SUN Lijun,CHENG Huailei,LIU Liping,et al.Fatigue characteristics of in-situ emulsified asphalt cold recycled mixtures [J].Journal of Tongji University (Natural Science),2017,45(11):1648-1654.(in Chinese)
[7] 严金海,倪富健,杨美坤.乳化沥青冷再生混合料的间接拉伸疲劳性能 [J].建筑材料学报,2011,14(1):58-61,77.YAN Jinhai,NI Fujian,YANG Meikun.Indirect tensile fatigue properties of emulsified asphalt cold recycled mixture [J].Journal of Building Materials,2011,14(1):58-61,77.(in Chinese)
[8] 王之怡,郝培文,柳浩,等.乳化沥青冷再生混合料疲劳性能研究 [J].公路交通科技,2015,32(2):28-32.WANG Zhiyi,HAO Peiwen,LIU Hao,et al.Fatigue performance of emulsified asphalt cold recycled mixture [J].Journal of Highway and Transportation Research and Development,2015,32(2):28-32.(in Chinese)
[9] 汪德才,郝培文,魏新来.乳化沥青冷再生混合料疲劳性能及影响因素 [J].北京工业大学学报,2016,42(4):541-546.WANG Decai,HAO Peiwen,WEI Xinlai.Fatigue properties and influencing factors of emulsified asphalt cold recycled mixture [J].Journal of Beijing University of Technology,2016,42(4):541-546.(in Chinese)
[10] 蒋应军,韩占闯.级配对乳化沥青冷再生混合料路用性能影响 [J].大连理工大学学报,2018,58(6):607-614.JIANG Yingjun,HAN Zhanchuang.Influence of gradation on pavement performance of emulsified asphalt cold regenerated mixture [J].Journal of Dalian University of Technology,2018,58(6):607-614.(in Chinese)
[11] 张明杰,祁文洋.铣刨工艺对RAP变异性和级配的影响 [J].石油沥青,2016,30(4):12-17.ZHANG Mingjie,QI Wenyang.Effect of milling process on RAP variability and gradation [J].Petroleum Asphalt,2016,30(4):12-17.(in Chinese)
[12] 蒋应军,曹帆,陈浙江,等.垂直振动成型水泥稳定碎石疲劳特性及应用 [J].长安大学学报(自然科学版),2014,34(4):1-6.JIANG Yingjun,CAO Fan,CHEN Zhejiang,et al.Fatigue characteristics and application of vertical vibration forming cement stabilized macadam [J].Journal of Chang′an University (Natural Science Edition),2014,34(4):1-6.(in Chinese)
[13] 刘海鹏,蒋应军,胡永林,等.级配对乳化沥青冷再生混合料强度的影响 [J].建筑材料学报,2018,21(3):503-510.LIU Haipeng,JIANG Yingjun,HU Yonglin,et al.Influence of gradation on strength of emulsified asphalt cold recycled mixture [J].Journal of Building Materials,2018,21(3):503-510.(in Chinese)
[14] 蒋应军,赵占林,李明杰.两种方法设计沥青混合料的疲劳特性 [J].江苏大学学报(自然科学版),2016,37(4):473-478.JIANG Yingjun,ZHAO Zhanlin,LI Mingjie.Fatigue characteristics of asphalt mixture designed by two methods [J].Journal of Jiangsu University (Natural Science Edition),2016,37(4):473-478.(in Chinese)
[15] 吕政桦,申爱琴,覃潇,等.乳化沥青冷再生混合料性能优化及机理研究 [J].建筑材料学报,2018,21(4):614-619.Lü Zhenghua,SHEN Aiqin,QIN Xiao,et al.Study on performance optimization and mechanism of emulsified asphalt cold recycled mixture [J].Journal of Building Materials,2018,21(4):614-619.(in Chinese)