水性环氧乳化沥青超薄磨耗层层间黏结性能  

Interlayer Bonding Behavior of Waterborne Epoxy Emulsified Asphalt Ultra-thin Wearing Course

作　　者：刘曙光 周铭钰 戴勇 吴超凡 张恒龙[4] LIU Shu-guang;ZHOU Ming-yu;DAI Yong;WU Chao-fan;ZHANG Heng-long(Hunan Tongtai Engineering Co.,Ltd.,Changsha,Hunan 410018,China;Hunan Provincial Key Laboratory for Green&Advanced Civil Engineering Materials and Application Technology,Hunan University,Changsha,Hunan 410082,China;Hunan Provincial Road and Rail Transit Green Construction and Digitally-enabled Operation Engineering Technology Research Center,Hunan Communication Polytechnic,Changsha,Hunan 410132,China;Research Institute of Hunan University in Chongqing,Chongqing 401121,China)

机构地区：[1]湖南省通泰工程有限公司,湖南长沙410018 [2]湖南大学绿色先进土木工程材料及应用技术湖南省重点实验室,湖南长沙410082 [3]湖南交通职业技术学院湖南省道路与轨道交通绿色建造与数智运维工程技术研究中心,湖南长沙410132 [4]湖南大学重庆研究院,重庆401121

出　　处：《公路交通科技》2024年第8期66-77,共12页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(52378449);湖南省交通科技进步与创新计划项目(202248);重庆市自然科学基金项目(CSTB2022NSCQMSX1066)。

摘　　要：为探究超薄磨耗层复合结构的层间黏结性能,采用先乳化后改性的方法制备水性环氧乳化沥青作为黏结层材料,以AC-13级配混合料模拟原始路面;选择AC-10,SMA-10,UWM-10这3种超薄磨耗层,通过直接剪切试验确定了各类型复合试件的荷载-位移拟合曲线,得到了剪切强度、峰值位移、剪切刚度和层间黏结能等性能指标,研究洒布量、试验温度、黏结剂类型、超薄磨耗层级配等因素对层间黏结性能的影响规律。结果表明:超薄磨耗层AC-10,SMA-10,UWM-10铺装的黏结剂推荐洒布量分别为0.9,1.2,0.9 kg/m^(2),加入水性环氧树脂对最佳洒布量的影响不大;环境温度对复合试件的层间力学性能有显著影响,随着温度升高,复合试件的剪切强度、剪切刚度、层间黏结能均减少,降幅达65%~90%;水性环氧乳化沥青的黏结性能显著优于空白样,改性黏结层的平均剪切强度、剪切刚度、层间黏结能分别为空白样的2.5,2.1,2.4倍,而在较高温度下,这些指标分别为空白样的3.3,2.5,3.5倍,水性环氧树脂的加入显著提升了黏结层的高温稳定性,使得热塑性乳化沥青向热固性方向发展;在3种超薄磨耗层中,SMA-10和UWM-10表现出更优异的黏结性能,而AC-10在路面温度达到35℃后的黏结性能会急剧衰退。To explore the interlayer bonding behavior of ultra-thin wearing course composite structures,the waterborne epoxy emulsified asphalt was prepared as the bonding layer material by using the preemulsification and post-modification method.AC-13 gradation mixture was used to simulate the original pavement.AC-10,SMA-10,and UWM-10 were selected as ultra-thin wearing courses.The direct shear tests were conducted to determine the load-displacement fitting curves of various composite specimens,obtaining performance indicators,e.g.,interlayer shearing strength,peak displacement,interlayer stiffness,and interlayer bonding energy.The influence of factors(e.g.,sprinkling amount,test temperature,binder type,and ultra-thin wearing course gradation)on interlayer bonding behavior was investigated.The result indicates that the optimal sprinkling amounts for AC-10,SMA-10,UWM-10 are 0.9,1.2,0.9 kg/m^(2)respectively.There is little effect of waterborne epoxy resin addition on the optimal sprinkling amount.The environmental temperature significantly affects the interlayer mechanical property of composite specimens.As the temperature increases,the shear strength,shear stiffness and interlayer bonding energy of composite specimens decrease by 65%-90%.The bonding behavior of waterborne epoxy emulsified asphalt is significantly superior to that of blank specimen.The average shear strength,shear stiffness,and interlayer bonding energy of modified bonding layer are 2.5,2.1,2.4 times of those of blank specimen.At higher temperatures,these indicators are 3.3,2.5,3.5 times of those of blank specimen.The addition of waterborne epoxy resin significantly improves the high temperature stability of bonding layer,and makes the thermoplastic emulsified asphalt develop in the thermosetting direction.Among 3 types of ultra-thin wearing courses,SMA-10 and UWM-10 exhibit superior bonding behavior,while the bonding behavior of AC-10 declines sharply when the pavement temperature reaches 35℃.

关 键 词：道路工程 改性沥青混合料 直接剪切试验 黏结性能 水性环氧树脂 

分 类 号：U414.1[交通运输工程—道路与铁道工程]