盐冻循环条件下SBS改性沥青及混合料的细观结构和低温蠕变性能
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摘要
在寒冷地区道路常用融雪盐来融雪除冰,沥青路面极易因盐冻循环而造成损坏。本文通过扫描电子显微镜(SEM)、弯曲梁流变仪(BBR)和万能试验机(UTM-100)对盐冻循环前后的苯乙烯-丁二烯-苯乙烯三嵌段共聚物(SBS)改性沥青及其混合料的细观结构和低温蠕变性能进行分析。结果表明:冻融循环后沥青及其混合料微观形貌变化明显,盐冻循环后沥青及其混合料表面出现的盐晶体会破坏沥青的膜结构和混合料结构的致密性,单纯水冻循环对沥青及其混合料低温性能影响较大;冻融循环后SBS改性沥青随温度降低其低温抗裂性能逐渐降低;选用低浓度融雪盐溶液可以在一定程度上保持SBS改性沥青及其混合料的低温抗裂性能;盐冻循环次数的增加,会降低SBS改性沥青及其混合料的低温性能。
Deicing salt are offen used to melt ice in roads of cold regions,while asphalt pavement is easy to be damaged by salt freezing cycle. The scanning electron microscope( SEM),bending beam rheometer( BBR) and universal testing machine( UTM-100) were used to analyze the microstructure and low temperature creep performance of styrene-butadiene-styrene tri-block copolymer( SBS) modified asphalt and its mixture before and after salt freezing cycle. The test results indicate that it has great change on microstructure of asphalt and asphalt mixture after freeze-thaw cycle,the salt crystal appear on the surface of the asphalt and its mixture can damage the structure of asphalt film and the compactness of mixture;the water freezing cycle have a great influence on the low temperature performance of asphalt and mixture; the low-temperature cracking resistance of SBS modified asphalt reduces gradually with the decrease of temperature after freeze-thaw cycles; the low concentration of deicing salt can maintain the low temperature anti-cracking performance of SBS modified asphalt and its mixture to a certain extent; the low temperature performance of SBS modified asphalt and its mixture will be reduced by increasing of thenumber of salt freezing cycles.
Deicing salt are offen used to melt ice in roads of cold regions,while asphalt pavement is easy to be damaged by salt freezing cycle. The scanning electron microscope( SEM),bending beam rheometer( BBR) and universal testing machine( UTM-100) were used to analyze the microstructure and low temperature creep performance of styrene-butadiene-styrene tri-block copolymer( SBS) modified asphalt and its mixture before and after salt freezing cycle. The test results indicate that it has great change on microstructure of asphalt and asphalt mixture after freeze-thaw cycle,the salt crystal appear on the surface of the asphalt and its mixture can damage the structure of asphalt film and the compactness of mixture;the water freezing cycle have a great influence on the low temperature performance of asphalt and mixture; the low-temperature cracking resistance of SBS modified asphalt reduces gradually with the decrease of temperature after freeze-thaw cycles; the low concentration of deicing salt can maintain the low temperature anti-cracking performance of SBS modified asphalt and its mixture to a certain extent; the low temperature performance of SBS modified asphalt and its mixture will be reduced by increasing of thenumber of salt freezing cycles.
引文
[1]喻文兵,李双洋,冯文杰,等.道路融雪除冰技术现状与发展趋势分析[J].冰川冻土,2011,33(4):933-940.
[2]谭忆秋,赵立冬,兰碧武,等.反复凝冰作用下沥青混合料性能研究[J].建筑材料学报,2011,14(6):761-766.
[3]王岚,弓宁宁,邢永明.盐冻融循环对沥青混合料性能的影响因素研究[J].功能材料,2016(4):88-93.
[4]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,2010:23-76.
[5]张晓可.除冰盐对沥青路面路用性能长期影响研究[D].重庆:重庆交通大学,2014.
[6]Fujimoto A,Tokunaga R A,Kiriishi M,et al.A road surface freezing model using heat,water and salt balance and its validation by field experiments[J].Cold Regions Science and Technology,2014(106-107):1-10.
[7]王文娟.冻融-盐分侵蚀作用下沥青混凝土疲劳性能试验与分析[D].淮南:安徽理工大学,2014.
[8]刘振正.盐冻循环条件下沥青材料的性能研究[D].呼和浩特:内蒙古工业大学,2013:30-59.
[9]常睿,郝培文.盐冻融循环对沥青混合料低温性能的影响[J].建筑材料学报,2017(3):481-488.
[10]肖庆一,白锡庆,胡海学,等.新型除冰盐对沥青及沥青混合料的侵蚀试验研究[J].中国港湾建设,2012(4):54-56+99.
[11]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,2011:1-15,19-52.
[12]冯蕾,王乐,崔亚楠,等.盐冻循环对胶粉改性沥青混合料性能的影响[J].公路工程,2014,39(4):117-123.
[13]熊剑平,申爱琴,潘载业.道路水泥混凝土抗盐冻性试验研究[J].公路,2010(2):152-159.
[14]中华人民共和国行业标准.《公路工程沥青及沥青混合料试验规程》(JTG E20-2011)[S].北京:人民交通出版社,2011.
[15]肖鹏,史杉杉,吴美平,等.橡胶沥青水老化试验研究[J].四川大学学报(工程科学版),2014(1):183-186.
[16]Aflaki S,Hajikarimi P,Fini E H,et al.Comparing effects of biobinder with other asphalt modifiers on low temperature characteristics of asphalt[J].Journal Of materials in Civil Engineering,2014,26(3):429-439.
[17]郝培文,刘红瑛.运用蠕变速率评价沥青混合料低温抗裂性能的研究[J].石油沥青,1994(3):6-10.
[2]谭忆秋,赵立冬,兰碧武,等.反复凝冰作用下沥青混合料性能研究[J].建筑材料学报,2011,14(6):761-766.
[3]王岚,弓宁宁,邢永明.盐冻融循环对沥青混合料性能的影响因素研究[J].功能材料,2016(4):88-93.
[4]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,2010:23-76.
[5]张晓可.除冰盐对沥青路面路用性能长期影响研究[D].重庆:重庆交通大学,2014.
[6]Fujimoto A,Tokunaga R A,Kiriishi M,et al.A road surface freezing model using heat,water and salt balance and its validation by field experiments[J].Cold Regions Science and Technology,2014(106-107):1-10.
[7]王文娟.冻融-盐分侵蚀作用下沥青混凝土疲劳性能试验与分析[D].淮南:安徽理工大学,2014.
[8]刘振正.盐冻循环条件下沥青材料的性能研究[D].呼和浩特:内蒙古工业大学,2013:30-59.
[9]常睿,郝培文.盐冻融循环对沥青混合料低温性能的影响[J].建筑材料学报,2017(3):481-488.
[10]肖庆一,白锡庆,胡海学,等.新型除冰盐对沥青及沥青混合料的侵蚀试验研究[J].中国港湾建设,2012(4):54-56+99.
[11]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,2011:1-15,19-52.
[12]冯蕾,王乐,崔亚楠,等.盐冻循环对胶粉改性沥青混合料性能的影响[J].公路工程,2014,39(4):117-123.
[13]熊剑平,申爱琴,潘载业.道路水泥混凝土抗盐冻性试验研究[J].公路,2010(2):152-159.
[14]中华人民共和国行业标准.《公路工程沥青及沥青混合料试验规程》(JTG E20-2011)[S].北京:人民交通出版社,2011.
[15]肖鹏,史杉杉,吴美平,等.橡胶沥青水老化试验研究[J].四川大学学报(工程科学版),2014(1):183-186.
[16]Aflaki S,Hajikarimi P,Fini E H,et al.Comparing effects of biobinder with other asphalt modifiers on low temperature characteristics of asphalt[J].Journal Of materials in Civil Engineering,2014,26(3):429-439.
[17]郝培文,刘红瑛.运用蠕变速率评价沥青混合料低温抗裂性能的研究[J].石油沥青,1994(3):6-10.