沥青基有机膨润土纳米复合材料的作用机理与应用
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摘要
利用熔融插层方式制备了不同种类及掺量的纳米材料改性沥青,通过沥青基本物理性能的比较筛选出有机膨润土并基于Superpave沥青胶结料评价方法分析了沥青基纳米复合材料的路用性能,通过XRD、FTIR表征了纳米复合材料的作用机理。结果表明:膨润土使伦特70#、盘锦90#沥青的性能均得到改善,且有机膨润土的基础物理性能都高于无机膨润土;有机膨润土提高了沥青的高温性能和耐老化性能,但对低温性能有负面影响。表现为复数剪切模量增加,相位角降低。粘度老化指数和复数剪切模量比降低。蠕变劲度模量增加,m值降低;有机膨润土晶体结构的层间距和分子特征峰强度随掺量的增加呈先增强后减弱的趋势;由应用性能及作用机理得到有机膨润土的最佳掺量为4%。
Different types and amounts of nanomaterial modified asphalt were prepared by melt intercalation. The organic bentonite was selected through comparison of basic physical properties and the road performance of the asphalt-based nanocomposites was analyzed based on Superpave asphalt binder evaluation method. And the mechanism of nanocomposites was characterized by X-ray diffraction and infrared spectroscopy. The results show that the performance of Lent 70# and Panjin 90# matrix asphalt is improved by Bentonite,and the basic physical properties of organic bentonite are higher than that of inorganic bentonite. Organic bentonite improves the high-temperature stability and aging resistance of asphalt,and its low-temperature properties have decreased,it appears that the complex shear modulus increases and the phase angle decreases. The viscosity aging index and the complex shear modulus ratio are reduced. Creep stiffness modulus increases,the value of m decreases. The interlamellar spacing and molecular characteristic peak intensity of the organic bentonite crystal structure increase first and then decrease with the increase of the content of the organic bentonite. The optimum blending amount of organic bentonite is 4% from the application performance and mechanism of action.
Different types and amounts of nanomaterial modified asphalt were prepared by melt intercalation. The organic bentonite was selected through comparison of basic physical properties and the road performance of the asphalt-based nanocomposites was analyzed based on Superpave asphalt binder evaluation method. And the mechanism of nanocomposites was characterized by X-ray diffraction and infrared spectroscopy. The results show that the performance of Lent 70# and Panjin 90# matrix asphalt is improved by Bentonite,and the basic physical properties of organic bentonite are higher than that of inorganic bentonite. Organic bentonite improves the high-temperature stability and aging resistance of asphalt,and its low-temperature properties have decreased,it appears that the complex shear modulus increases and the phase angle decreases. The viscosity aging index and the complex shear modulus ratio are reduced. Creep stiffness modulus increases,the value of m decreases. The interlamellar spacing and molecular characteristic peak intensity of the organic bentonite crystal structure increase first and then decrease with the increase of the content of the organic bentonite. The optimum blending amount of organic bentonite is 4% from the application performance and mechanism of action.
引文
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[2]Li R,Xiao F P,Amirkhanian S,et al.Developments of nano materials and technologies on asphalt materials[J].Construction and Building Materials,2017(143):633-648.
[3]You Z,Mills-Beale J,Foley J M,et al.Nanoclay-modified asphalt materials:preparation and characterization[J].Construction and Building Material,2011,25(2):1072-1078.
[4]Zare-Shahabadi A,Shokuhfar A,Ebrahimi-Nejad S.Preparation and rheological characterization of asphalt binders reinforced with layered silicate nanoparticles[J].Construction and Building Material,2010,24(7):1239-1244.
[5]Abdullah M E,Zamhair K A,Buhair R,et al.Short term and long term aging efficts of asphalt binder modified with montmorillonite[J].Key Engineering Materials,2014,594:996-1001.
[6]陈晓龙,孙永升,韩跃新,等.有机膨润土改性沥青的微观结构特性及DSC分析[J].东北大学学报(自然科学版),2012,33(5):743-747.
[7]杨春风,高恒楠,孙吉书.纳米膨润土改性沥青混合料路用性能试验研究[J].中外公路,2016,36(3):289-292.
[8]谭彦卿,金娇,郑健龙等.有机改性膨润土制备及其用于改性沥青的研究进展[J].硅酸盐通报,2017,36(8):2636-2641.
[9]Sun L,Xin X T,Ren J L.Inorganic nanoparticle-modified asphalt with enhanced performance at high temperature[J].Joural of Materials in Civil Engineering,2017,29(3):04016227.
[10]Yao H,You Z P.Nanoclay modified asphalt[M].United Kingdom.Woodhead Publishing,2016,183-216.(下转第542页)
[11]Jin J,Tan Y P,Liu R H,et al.Structure characteristics of organic bentonite and the effects on rheological and aging properties of asphalt[J].Powder Technology,2018(329):107-114.
[12]Yu J Y,Wang X,Hu L.Effect of Various organomodified montmorillonites on the properties of montmorillonite/bitumen nanocomposites[J].Journal of Materials in Civil Engineering,2010,22(8):788-793.
[13]李笑尘.SUPERPAVE中的沥青PG分级浅析[A].中国公路学会养护与管理分会:2017:389-396.
[14]Vargas M A,Moreno L,Montiel R,et al.Effects of montmorillonite(Mt)and two different organo-Mt additives on the performance of asphalt[J].Applied Clay Science,2017(139):20-27.
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