盐冻循环条件下两种沥青的微观结构及高低温性能
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摘要
利用原子力显微镜(AFM)、动态剪切流变仪(DSR)和弯曲梁流变仪(BBR)对冻融循环前后的基质沥青和苯乙烯-丁二烯-苯乙烯三嵌段共聚物(SBS)改性沥青进行了微观结构观测和高低温性能测试。试验结果表明:经冻融循环后,沥青"蜂形"结构的数量和尺寸出现不同变化,基质沥青中沥青质含量增加且分散状况变差,SBS改性剂三维网状结构遭到破坏;基质沥青的高温性能有所提升,抗疲劳性能降低,SBS改性沥青的高温性能降低,抗疲劳能力提升;融雪盐浓度增大在一定程度上降低了基质沥青的低温抗裂能力,融雪盐浓度为4wt%时,SBS改性沥青的低温抗裂能力得到提高。SBS改性沥青高低温性能总体上优于基质沥青,建议北方等寒冷地区尽量选用SBS改性沥青作为路面材料。
The microstructure and the high-and-low temperature performance of matrix asphalt and styrenebutadiene-styrene tri-block copolymer(SBS)modified asphalt before and after the salt freezing cycle were studied by the AFM,DSR and BBR,respectively.The results indicate that the asphaltene content of matrix asphalt increases and the dispersion situation of matrix asphalt gets worse,and three-dimensional network structure of SBS modifier is destroyed due to the number and size of asphalt "bee"structures changing after freeze-thaw cycles.The high temperature performance of matrix asphalt increases slightly and anti-fatigue performance decreases after the salt freezing cycle,while high temperature property of SBS modified asphalt decreases and the fatigue properties increases.To a certain degree,the increase of salt concentration make the low temperature cracking resistance of matrix asphalt reduce.However,when the concentration of salt reaches up to 4wt%,the low temperature cracking resistance of SBS modified asphalt is improved.Hence,the high-and-low temperature performance of SBS modified asphalt is better than that of matrix asphalt.It is recommended that SBS modified asphalt should be chose as the pavement material in the cold region as far as possible.
The microstructure and the high-and-low temperature performance of matrix asphalt and styrenebutadiene-styrene tri-block copolymer(SBS)modified asphalt before and after the salt freezing cycle were studied by the AFM,DSR and BBR,respectively.The results indicate that the asphaltene content of matrix asphalt increases and the dispersion situation of matrix asphalt gets worse,and three-dimensional network structure of SBS modifier is destroyed due to the number and size of asphalt "bee"structures changing after freeze-thaw cycles.The high temperature performance of matrix asphalt increases slightly and anti-fatigue performance decreases after the salt freezing cycle,while high temperature property of SBS modified asphalt decreases and the fatigue properties increases.To a certain degree,the increase of salt concentration make the low temperature cracking resistance of matrix asphalt reduce.However,when the concentration of salt reaches up to 4wt%,the low temperature cracking resistance of SBS modified asphalt is improved.Hence,the high-and-low temperature performance of SBS modified asphalt is better than that of matrix asphalt.It is recommended that SBS modified asphalt should be chose as the pavement material in the cold region as far as possible.
引文
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[19]张永辉.SBS改性沥青和橡胶粉改性沥青机理及路用性能研究[D].西安:长安大学,2015.ZHANG Y H.Research on the mechanism and pavement performance of SBS modified asphalt and rubber powder modified asphalt[D].Xi’an:Chang’an University,2015(in Chinese).
[20]陈华鑫,王秉纲.基质沥青和SBS改性剂的相互作用机理分析[J].公路,2007(2):134-137.CHEN H X,WANG B G.Analysis of interaction mechanism between base asphalt and SBS polymer[J].Highway,2007(2):134-137(in Chinese).
[21]栗威.除冰剂对机场沥青道面性能影响研究[D].长沙:长沙理工大学,2013.LI W.Research on the influence of deicer to performance of airport asphalt pavement[D].Changsha:Changsha University of Science&Technology,2013(in Chinese).
[2]傅广文.融雪剂对沥青及沥青混合料性能影响研究[D].长沙:长沙理工大学,2010.FU G W.Research on influence of snowmelt agent to performance of asphalt and asphalt mixture[D].Changsha:Changsha University of Science&Technology,2010(in Chinese).
[3]韩吉伟,崔亚楠,李嘉迪,等.盐冻循环条件下改性沥青的细观结构及低温流变性能分析[J].复合材料学报,2016,33(8):1718-1724HAN J W,CUI Y N,LI J D,et al.Analysis of microstructure and rheological properties of modified asphalt under salt freezing cycle at low temperature[J].Acta Materiae Compositae Sinica,2016,33(8):1718-1724(in Chinese).
[4]吴泽媚.氯盐和冻融对混凝土破坏特征及机理研究[D].南京:南京航空航天大学,2012.WU Z M.Failure characteristics and mechanism of chlorine deicers and freeze-thaw on concrete[D].Nanjing:Nanjing University of Aeronautics and Astronautics,2012(in Chinese).
[5]刘振正.盐冻循环条件下的沥青材料的性能研究[D].呼和浩特:内蒙古工业大学,2013.LIU Z Z.Research on the performance change of asphalt under the salt freezing circulation[D].Hohhot:Inner Mongolia University of Technology,2013(in Chinese).
[6]潘宝峰,王哲人,陈静云,等.沥青混合料抗冻融循环性能的试验研究[J].中国公路学报,2003,16(2):1-4.PAN B F,WANG Z R,CHEN J Y,et al.Test and study of the alternate freezing and thawing capability of the bituminous mixture[J].China Journal of Highway and Transport,2003,16(2):1-4(in Chinese).
[7]吴钊.冻融循环对沥青混合料性能的影响研究[D].武汉:武汉理工大学,2011.WU Z.Impact of freeze-thaw cycles on the performance of asphalt mixture[D].Wuhan:Wuhan University of Technology,2011(in Chinese).
[8]中华人民共和国行业标准.JTG E20—2011公路工程沥青及沥青混合料试验规程[S].北京:人民交通出版社,2011.Industry Standard of the People’s Republic of China.JTGE20—2011Standard test methods of bitumen and bitumen mixture for highway engineering[S].Beijing:China Communications Press,2011(in Chinese).
[9]庞凌.沥青紫外光老化特性研究[D].武汉:武汉理工大学,2008.PANG L.Research on the ultraviolet radiation ageing characteristics of asphalt[D].Wuhan:Wuhan University of Tech-nology,2008(in Chinese).
[10]李波.基于原子力显微镜技术的温拌沥青老化过程中粘附特性研究[D].兰州:兰州交通大学,2015.LI B.Research on the adhesion characteristics of warm mix asphalt based on atomic force microscope technique[D].Lanzhou:Lanzhou Jiaotong University,2015(in Chinese).
[11]李双瑞,林青,董声雄,等.SBS改性沥青机理研究进展[J].高分子通报,2008(5):14-19.LI S R,LIN Q,DONG S X,et al.Progress in mechanism of SBS-modified asphalts[J].Polymer Bulletin,2008(5):14-19(in Chinese).
[12]孙长新.高聚物化学网构改性沥青原理及性能[J].中南公路工程,2004,29(3):61-65.SUN C X.Principle and performance of polymer chemical networking modified asphalt[J].Central South Highway Engineering,2004,29(3):61-65(in Chinese).
[13]张争奇,崔文社,马良,等.SBS改性沥青软化点试验特性[J].长安大学学报:自然科学版,2007,27(6):6-10.ZHANG Z Q,CUI W S,MA L,et al.Experimental feature of softening point of SBS modified asphalt[J].Journal of Chang’an University:Natural Science Edition,2007,27(6):6-10(in Chinese).
[14]ALLEN R G,LITTLE D N,BHASIN A.Structural characterization of micromechanical properties in asphalt using atomic force microscopy[J].Journal of Materials in Civil Engineering,2012,24(10):1317-1327.
[15]王岚,胡江三,陈刚,等.聚合物改性沥青及混合料高低温性能试验研究[J].公路工程,2014,39(4):69-72.WANG L,HU J S,CHEN G,et al.Experimental study on the performance of high and low temperature of polymer modified asphalt and mixture[J].Highway Engineering,2014,39(4):69-72(in Chinese).
[16]崔亚楠.盐冻循环对沥青性能及其微观结构的影响[J].功能材料,2015,46(18):18037-18042.CUI Y N.Research on the performance and microstructure of asphalt under salt freezing cycle[J].Journal of Functional Materials,2015,46(18):18037-18042(in Chinese).
[17]MOON K H,FALCHETTO A C,MARASTEANU M O.Investigation of limiting criteria for low temperature cracking of asphalt mixture[J].KSCE Journal of Civil Engineering,2014,18(1):172-181.
[18]栾自胜.SBS改性沥青低温性能评价方法[J].武汉:武汉理工大学学报,2010(2):15-18.LUAN Z S.Evaluation methods of SBS modified-asphalt binders[J].Journal of Wuhan University of Technology,2010(2):15-18(in Chinese).
[19]张永辉.SBS改性沥青和橡胶粉改性沥青机理及路用性能研究[D].西安:长安大学,2015.ZHANG Y H.Research on the mechanism and pavement performance of SBS modified asphalt and rubber powder modified asphalt[D].Xi’an:Chang’an University,2015(in Chinese).
[20]陈华鑫,王秉纲.基质沥青和SBS改性剂的相互作用机理分析[J].公路,2007(2):134-137.CHEN H X,WANG B G.Analysis of interaction mechanism between base asphalt and SBS polymer[J].Highway,2007(2):134-137(in Chinese).
[21]栗威.除冰剂对机场沥青道面性能影响研究[D].长沙:长沙理工大学,2013.LI W.Research on the influence of deicer to performance of airport asphalt pavement[D].Changsha:Changsha University of Science&Technology,2013(in Chinese).