生物油再生沥青自愈合机理分析
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摘要
对再生沥青进行流变性能测试、微观结构表征、结构特性分析及宏观性能测试,研究生物油对老化沥青自愈合性能的影响,建立了再生沥青微观结构和宏观性能的构效关系。借助分子动力学软件及Wool-O’Connor自愈合模型计算得到最佳愈合温度时的最短愈合时间。研究结果表明:生物油再生沥青(BRA)的愈合行为包括黏性流动和弹性恢复,在高温(60℃和80℃)环境下,BRA的愈合行为取决于黏性流动,而在低温(20℃和40℃)环境下BRA的愈合行为取决于弹性恢复。在60℃的愈合试验温度、5%的疲劳应变条件下,BRA的最佳愈合时间为30 min,最短完全愈合时间为32 min;试验结果和模型计算结果相近,自愈合模型可较好地分析BRA的完全愈合时间。老化3年、5年、10年的BRA在其最佳愈合温度时的最短愈合时间分别为32,52,78 min,表明生物油可在一定程度上提高旧路面老化沥青的部分自愈合性能。
To understand the self-healing mechanism of bio-oil recycled asphalt(BRA), rheological properties, microstructure characteristics, and macroscopic properties of recycled asphalt were studied. The structure-function relationship between the microstructure and the macroscopic properties of recycled asphalt was established. Molecular dynamics software and Wool-O'Connor model were used to calculate the shortest healing temperature and minimum healing time. The self-healing mechanism of BRA includes viscous flow and elastic recovery. Viscous flow was dominant at high temperatures(60 ℃ and 80 ℃), near the softening point; elastic recovery was dominant at lower temperatures(20 ℃ and 40 ℃); and the two healing mechanisms operated simultaneously at 60 ℃ and 80 ℃. The optimum healing time and shortest complete healing time for BRA are 30 min and 32 min, respectively, when the healing temperature is 60 ℃ and the fatigue strain is 5%. The results of the experiment were similar to that of Wool-O'Connor's model. The self-healing model can be used to analyze the complete healing time of BRA. The shortest complete healing times of BRA, aged for 3, 5, and 10 years, were 32, 52, and 78 min, respectively. Moreover, bio-oil could improve the self-healing properties of asphalt, which was partially extracted from an old asphalt pavement.
To understand the self-healing mechanism of bio-oil recycled asphalt(BRA), rheological properties, microstructure characteristics, and macroscopic properties of recycled asphalt were studied. The structure-function relationship between the microstructure and the macroscopic properties of recycled asphalt was established. Molecular dynamics software and Wool-O'Connor model were used to calculate the shortest healing temperature and minimum healing time. The self-healing mechanism of BRA includes viscous flow and elastic recovery. Viscous flow was dominant at high temperatures(60 ℃ and 80 ℃), near the softening point; elastic recovery was dominant at lower temperatures(20 ℃ and 40 ℃); and the two healing mechanisms operated simultaneously at 60 ℃ and 80 ℃. The optimum healing time and shortest complete healing time for BRA are 30 min and 32 min, respectively, when the healing temperature is 60 ℃ and the fatigue strain is 5%. The results of the experiment were similar to that of Wool-O'Connor's model. The self-healing model can be used to analyze the complete healing time of BRA. The shortest complete healing times of BRA, aged for 3, 5, and 10 years, were 32, 52, and 78 min, respectively. Moreover, bio-oil could improve the self-healing properties of asphalt, which was partially extracted from an old asphalt pavement.
引文
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[18] SUN B,ZHOU X.Diffusion and Rheological Properties of Asphalt Modified by Bio-oil Regenerant Derived from Waste Wood [J].Journal of Materials in Civil Engineering,2018,30 (2):04017274-1-04017274-8.
[19] BANERJEE A,SMIT A D F,PROZZI J A.The Effect of Long-term Aging on the Rheology of Warm Mix Asphalt Binders [J].Fuel,2012,97:603-611.
[2] YANG S H,SUCIPTAN T.Rheological Behavior of Japanese Cedar-based Bio-binder as Partial Replacement for Bituminous Binder [J].Construction and Building Materials,2016,114:127-133.
[3] RANMAN N A A,HAININ M R,HASSAN N A,et al.A Review on the Application of Bio-oil as an Additive for Asphalt [J].Jurnal Teknologi,2015,72 (5):105-110.
[4] XU G J,WANG H.Molecular Dynamics Study of Oxidative Aging Effect on Asphalt Binder Properties [J].Fuel,2017,188:1-10.
[5] YANG X,YOU Z,DAI Q,et al.Mechanical Performance of Asphalt Mixtures Modified by Bio-oils Derived from Waste Wood Resources [J].Construction and Building Materials,2014,51:424-431.
[6] 贾鹏.普通干线公路再生路面结构及材料特性研究[D].北京:北京交通大学,2014.JIA Peng.Research of Recycling Pavement Structure and Material for Common Main Stem Road [D].Beijing:Beijing Jiaotong University,2014.
[7] RINALDI R,JASTRZEBSKI R,CLOUGH M T,et al.Paving the Way for Lignin Valorisation:Recent Advances in Bioengineering,Biorefining and Catalysis [J].Angewandte Chemie,2016,55 (29):8164-8215.
[8] MOHAN D,PITTMAN C U,STEELE P H.Pyrolysis of Wood/Biomass for Bio-oil:A Critical Review [J].Energy & Fuels,2006,20 (3):848-889.
[9] TANG J,LIU Q,WU S,et al.Investigation of the Optimal Self-healing Temperatures and Healing Time of Asphalt Binders [J].Construction and Building Materials,2016,113:1029-1033.
[10] BONNAURE F P,HUIBERS A,BOONDERS A.A Laboratory Investigation of the Influence of Rest Periods on the Fatigue Characteristics of Bituminous Mixes [J].Journal of the Association of Asphalt Paving Technologists,1982,51:104-128.
[11] GARCIA A,NORAMBUENA-CONTRERAS J,BUENO M,et al.Single and Multiple Healing of Porous and Dense Asphalt Concrete [J].Journal of Intelligent Material Systems and Structures,2015,26 (4):425-433.
[12] LEE H J,DANIEL J S,KIM Y R.Laboratory Performance Evaluation of Modified Asphalt Mixtures for Inchon Airport Pavements [J].International Journal of Pavement Engineering,2000,1 (2):151-169.
[13] KIM B,ROQUE R.Evaluation of Healing Property of Asphalt Mixtures [J].Transportation Research Record,2006 (1970):84-91.
[14] 何亮,赵龙,凌天清,等.密实型沥青混合料裂缝感应热自愈合性能研究[J].中国公路学报,2017,30(1):17-24.HE Liang,ZHAO Long,LING Tian-qing,et al.Research on Induction Heating Activated Self-healing of Cracks in Dense Graded Asphalt Mixture [J].China Journal of Highway and Transport,2017,30 (1):17-24.
[15] SUN Y,WU S,LIU Q,et al.Self-healing Performance of Asphalt Mixtures Through Heating Fibers or Aggregate [J].Construction and Building Materials,2017,150:673-680.
[16] FRANESQUI M A,YEPES J,GARCIACONZZALEZ C.Top-down Cracking Self-healing of Asphalt Pavements with Steel Filler from Industrial Waste Applying Microwaves [J].Construction and Building Materials,2017,149:612-620.
[17] YANG T,CHEN M,ZHOU X,et al.Evaluation of Thermal-mechanical Properties of Bio-oil Regenerated Aged Asphalt [J].Materials,2018,11 (11):1-12.
[18] SUN B,ZHOU X.Diffusion and Rheological Properties of Asphalt Modified by Bio-oil Regenerant Derived from Waste Wood [J].Journal of Materials in Civil Engineering,2018,30 (2):04017274-1-04017274-8.
[19] BANERJEE A,SMIT A D F,PROZZI J A.The Effect of Long-term Aging on the Rheology of Warm Mix Asphalt Binders [J].Fuel,2012,97:603-611.
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