界面水对沥青复合小梁疲劳性能的影响
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摘要
为探讨界面水对沥青铺面使用性能产生的影响,拟采用含有层间界面的复合沥青小梁为试验对象,并以四点弯曲小梁试验为主,直接剪切试验为辅的试验方法,分别以层间洒水量和试件浸水天数为影响因素,模拟施工和使用中铺面渗水情况,测定其在不同试验条件下,复合小梁的抗剪强度及疲劳性能。通过复合小梁纵剖面激光扫描,分析了不同界面水来源状态下的复合小梁水损害机理。试验结果表明:(1)浸水天数对复合小梁的层间抗剪强度影响要大于层间洒水量对其的影响;(2)在相同试验条件下,随着层间洒水量或浸水天数的增加,复合小梁的疲劳寿命对数衰减率呈现增加趋势,但增加趋势有所不同。其中,浸泡达到一定天数后其增加趋势明显变缓;(3)复合小梁试件弯曲劲度模量的损失随层间洒水量的增加呈非线性增加,但损失量不超过10%;而随试件浸水天数的增加,其损失量也逐渐增大,最大达到31%,在浸水5 d后,其损失量趋于稳定;(4)复合小梁纵剖面激光扫描显示,层间洒水使复合小梁在层间界面出现细小的空隙,而试件浸水后在界面上层混合料内部出现大面积的集料剥离,故浸水导致复合小梁性能下降更严重。
In order to investigate the influence of interface water on the performance of asphalt pavement, the composite asphalt beam which has interlayer is used to carry out the four-point bending beam test and the direct shear test.The water seepage in pavement during road construction and service is simulated considering the influence of interlayer water sprinkle and the number of days of water immersion on the specimen, and the shear strength and fatigue performance of the composite asphalt beam under different conditions are measured. By laser scanning on the longitudinal profile of the composite beam, the water damage mechanism of composite beam under different interface water sources is analyzed. The test result shows that(1) the influence of immersion days on the interlayer shear strength of composite beam is greater than that of interlayer water sprinkle;(2) under the same test condition, the logarithmic decay rate of fatigue life increased with the rise of the interlayer water sprinkle or the number of days of water immersion, however, the increase trend is different, where the increase trend after immersion for a certain number of days obviously slowed down;(3) with the increase of the interlayer water sprinkle, the bending stiffness modulus loss of the composite beam increased nonlinearly, and the loss is less than 10%;(4) with the increase of water immersion days, the bending stiffness modulus loss increased gradually, reaching 31%, but it became stable after 5 days;(4) the laser scanning shows that the interlayer sprinkling makes the composite beam appeared small gap in the interface, and the specimen appeared a large area of peeled aggregate inside the upper interface of the mixture after specimen soaked, therefore, the damage of the composite beam caused by immersion is more serious.
In order to investigate the influence of interface water on the performance of asphalt pavement, the composite asphalt beam which has interlayer is used to carry out the four-point bending beam test and the direct shear test.The water seepage in pavement during road construction and service is simulated considering the influence of interlayer water sprinkle and the number of days of water immersion on the specimen, and the shear strength and fatigue performance of the composite asphalt beam under different conditions are measured. By laser scanning on the longitudinal profile of the composite beam, the water damage mechanism of composite beam under different interface water sources is analyzed. The test result shows that(1) the influence of immersion days on the interlayer shear strength of composite beam is greater than that of interlayer water sprinkle;(2) under the same test condition, the logarithmic decay rate of fatigue life increased with the rise of the interlayer water sprinkle or the number of days of water immersion, however, the increase trend is different, where the increase trend after immersion for a certain number of days obviously slowed down;(3) with the increase of the interlayer water sprinkle, the bending stiffness modulus loss of the composite beam increased nonlinearly, and the loss is less than 10%;(4) with the increase of water immersion days, the bending stiffness modulus loss increased gradually, reaching 31%, but it became stable after 5 days;(4) the laser scanning shows that the interlayer sprinkling makes the composite beam appeared small gap in the interface, and the specimen appeared a large area of peeled aggregate inside the upper interface of the mixture after specimen soaked, therefore, the damage of the composite beam caused by immersion is more serious.
引文
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[15]韩海峰,吕伟民,何桂平.水作用下沥青混合料永久变形特性的表现形式[J].中国公路学报,2003,16(4):4-8.HAN Hai-feng,LWei-min,HE Gui-ping.Effects of Water on Permanent Deformation Potential of Hot-mix Asphalt[J].China Journal of Highway and Transport,2003,16(4):4-8.
[16]沙庆林.高速公路沥青路面的水破坏及其防治措施[J].中外公路,2000,20(3):1-4.SHA Qing-lin.Water Damage and Prevention Measures of Asphalt Pavement on Expressway[J].Journal of China&Foreign Highway,2000,20(3):1-4.
[17]沈金安,李福普,陈景.高速公路沥青路面早期损坏分析与防治对策[M].北京:人民交通出版社,2004.SHEN Jin-an,LI Fu-pu,CHEN Jing.Analysis and Preventive Techniques of Premature Damage of Asphalt Pavement in Expressway[M].Beijing:China Communications Press,2004.
[18]王旭东,沙爱民,徐志鸿.沥青路面材料动力特性与动态参数[M].北京:人民交通出版社,2002.WANG Xu-dong,SHA Ai-min,XU Zhi-hong.Dynamic Characteristics and Dynamic Parameters of Asphalt Pavement Material[M].Beijing:China Communications Press,2002.
[2]朱洪洲,高爽,唐伯明.沥青混合料常应变小梁弯曲疲劳试验[J].华中科技大学学报:城市科学版,2009,26(2):5-8.ZHU Hong-zhou,GAO Shuang,TANG Bo-ming.Fatigue Properties of Asphalt Mixtures by Controlled-strain Testing[J].Journal of Huazhong University of Science and Technology:Urban Science Edition,2009,26(2):5-8.
[3]杨慧光,孙杨勇.多雨地区沥青混凝土路面水损害防治技术分析[J].公路,2004(11):165-167.YANG Hui-guang,SUN Yang-yong.Analysis of Anti-water Damage Method of Asphalt Pavements in Rainy Regions[J].Journal of Highway,2004(11):165-167.
[4]张志强,余概宁,钱国平.广东省重载沥青路面的水损害及防治对策[J].中外公路,2004,24(4):43-45.ZHANG Zhi-qiang,YU Gai-ning,QIAN Guo-ping.Water Damage to Overloading Asphalt Pavement of Guangdong Province and Countermeasures[J].Journal of China&Foreign Highway,2004,24(4):43-45.
[5]高阳,邹晓翎,张童童.考虑动水压力影响的沥青路面损伤机理研究综述[J].中外公路,2018,38(4):59-64.GAO Yang,ZOU Xiao-ling,ZHANG Tong-tong.Review of Researches on Damage Mechanism of Asphalt Pavement Considering Effect of Hydrodynamic Pressure[J].Journal of China and Foreign Highway,2018,38(4):59-64.
[6]沙庆林.高速公路沥青路面早期破坏现象及预防[M].北京:人民交通出版社,2008:206-216.SHA Qing-lin.Premature Damage and Its Preservative Measures of Bituminous Pavement of Expressway[M].Beijing:China Communications Press,2008:206-216.
[7]孙立军.沥青路面结构行为学[M].上海:同济大学出版社,2013:277-281.SUN Li-jun.Asphalt Pavement Structure Behavior[M].Shanghai:Tongji University Press,2013:277-281.
[8]TERREL R L,SHUTE J W.Summary Report on Water Sensitivity Report,SHRP-A/ZR89-003[R].Washington,D.C.:Transportation Research Board,1989.
[9]AL-JOAIB A A.Evaluation of Water Damage on Asphalt Concrete Mixtures Using the Environment Conditioning System[D].Ann Arbor:Oregon State University,1993.
[10]董泽蛟,曹丽萍,谭忆秋,等.表面排水条件对饱水沥青路面动力响应的影响分析[J].公路交通科技,2008,25(1):10-15.DONG Ze-jiao,CAO Li-ping,TAN Yi-qiu,et al.Influence of Surface Drainage Conditions on Dynamic Response of Saturated Asphalt Pavement[J].Journal of Highway and Transportation Research and Development,2008,25(1):10-15.
[11]秦旻,梁乃兴,陆兆峰.水-温作用下沥青混合料疲劳性能分析[J].中南大学学报:自然科学版,2011,42(4):1126-1132.QIN Min,LIANG Nai-xing,LU Zhao-feng.Fatigue Property Analysis of Asphalt Mixture in Water-temperature Action[J].Journal of Central South University:Science and Technology Edition,2011,42(4):1126-1132.
[12]胡斌,张肖宁.动水作用下沥青混合料疲劳性能变化[J].哈尔滨工业大学学报,2016,48(3):120-124.HU Bin,ZHANG Xiao-ning.Reduction of Asphalt Concrete Anti-fatigue Performance under Hydrodynamic Effect[J].Journal of Harbin Institute of Technology,2016,48(3):120-124.
[13]姜旺恒,张肖宁,李智.沥青混凝土的动水压力模拟试验[J].公路交通科技,2011,28(10):35-39.JIANG Wang-heng,ZHANG Xiao-ning,LI Zhi.Simulation Test of Dynamic Water Pressure for Asphalt Pavement[J].Journal of Highway and Transportation Research and Development,2011,28(10):35-39.
[14]STEPHEN A C,MICHAEL D V.Effects of Sample Preconditioning on Asphalt Pavement Analyzer(APA)Wet Rut Depths[C]//Transportation Research Board80th Annual Meeting.Washington,D.C.:Transportation Research Board,2001:20-23.
[15]韩海峰,吕伟民,何桂平.水作用下沥青混合料永久变形特性的表现形式[J].中国公路学报,2003,16(4):4-8.HAN Hai-feng,LWei-min,HE Gui-ping.Effects of Water on Permanent Deformation Potential of Hot-mix Asphalt[J].China Journal of Highway and Transport,2003,16(4):4-8.
[16]沙庆林.高速公路沥青路面的水破坏及其防治措施[J].中外公路,2000,20(3):1-4.SHA Qing-lin.Water Damage and Prevention Measures of Asphalt Pavement on Expressway[J].Journal of China&Foreign Highway,2000,20(3):1-4.
[17]沈金安,李福普,陈景.高速公路沥青路面早期损坏分析与防治对策[M].北京:人民交通出版社,2004.SHEN Jin-an,LI Fu-pu,CHEN Jing.Analysis and Preventive Techniques of Premature Damage of Asphalt Pavement in Expressway[M].Beijing:China Communications Press,2004.
[18]王旭东,沙爱民,徐志鸿.沥青路面材料动力特性与动态参数[M].北京:人民交通出版社,2002.WANG Xu-dong,SHA Ai-min,XU Zhi-hong.Dynamic Characteristics and Dynamic Parameters of Asphalt Pavement Material[M].Beijing:China Communications Press,2002.