摘要
为减轻桥面铺装结构自重,选取厚度为7~10 mm树脂沥青罩面(EBCL)和薄层聚合物罩面(TPO)开展研究。通过复合试件层间剪切试验和拉拔试验,探究常温、高温条件下,EBCL-UHPC、TPO-UHPC界面黏结性能,提出增加剪切模量E_d评价复合结构层间黏结状态;通过模拟高温、紫外线光照、水损害3种不利环境条件,探究EBCL-UHPC、TPO-UHPC界面的耐老化性及劣化规律。结果表明:两种复合试件拉拔和剪切破坏都发生在UHPC与磨耗层的交界面,说明层间是薄弱部位;EBCL-UHPC层间拉拔强度、剪切强度及剪切模量分别为4.39 MPa,10.68 MPa,2886 N/cm^3,TPO-UHPC层间拉拔强度、剪切强度及剪切模量分别为4.21 MPa,10.33 MPa,2604 N/cm^3,常温下二者黏结性能相当;相比于常温,高温(60℃)条件下EBCL-UHPC层间拉拔强度、剪切强度及剪切模量分别下降了73.1%,80.15%,58.42%,TPO-UHPC分别下降了51.1%,68.1%,46.97%,温度对两类材料层间黏结性能有显著影响,TPO表现出更好的高温稳定性;在高温、紫外线光照和水损害不利环境下,两类复合试件层间黏结性能均有一定程度下降,但仍保持良好的状况,具有较好的耐老化性能;不同环境下老化程度存在差异,环境影响程度排序为:水损害>紫外线光照>高温;3种环境老化循环次数下,剪切模量与剪切强度的劣化规律基本一致,但剪切模量的劣化程度要低于剪切强度。对某长江公路大桥进行实桥仿真分析和有限元计算的结果表明:EBCL-UHPC和TPO-UHPC均能满足常温、高温条件下层间受力要求,且有足够安全储备。
To reduce the self-weight of bridge deck pavement structure,the resin asphalt overlay(EBCL)with thickness of 7-10 mm and thin polymer overlay(TPO)are selected for research.Through interlayer shear test and pullout test on composite specimens,the interfacial bonding performance of EBCL-UHPC and TPO-UHPC at normal temperature and high temperature are explored,and shear modulus E_d is proposed to evaluate the bonding state of the composite structure.By simulating 3 unfavorable environmental conditions(high temperature,ultraviolet light,and water damage),the aging resistance and the degradation of EBCL-UHPC and TPO-UHPC interfaces are explored.The result shows that(1)the pull-out and shear failures of the 2 composite specimens all occurred at the interface between UHPC and the wear layer,indicating that the interlayer is the weak part;(2)the tensile strength,shear strength and shear modulus of EBCL-UHPC interlayer are 4.39 MPa,10.68 MPa,2886 N/cm^3 respectively,while those of TPO-UHPC interlayer are 4.21 MPa,10.33 MPa,2604 N/cm^3 respectively,confirming that bonding performances of both kinds under normal temperature are excellent equivalently;(3)compared with normal temperature,the tensile strength,shear strength and shear modulus of EBCL-UHPC interlayer at higher temperature(60℃)decreased by 73.1%,80.15%and 58.42%respectively,and those of TPO-UHPC interlayer decreased by 51.1%,68.1%and 46.97%respectively,indicating the significant influence of temperature on the interfacial bonding performance of the 2 materials,and TPO shows better high temperature stability;(4)under the adverse environment conditions including high temperature,ultraviolet light and water damage,the interfacial bonding performance of the 2 types of composite specimens have decreased to a certain extent,but they are still in good condition and have good aging resistance;(5)there are differences in the aging degree in different environments,and the order of environmental influence is:water damage>ultraviolet light>high temperature;(6)under the 3 e
作者
李嘉
袁鹏
黄聪
LI Jia;YUAN Peng;HUANG Cong(School of Civil Engineering,Hunan University,Changsha Hunan 410000,China;Key Laboratory for Wind and Bridge Engineering of Hunan Province,Hunan University,Changsha Hunan 410000,China)
出处
《公路交通科技》
CAS
CSCD
北大核心
2020年第11期39-48,共10页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金项目(51678229)。
关键词
桥梁工程
超薄磨耗层
黏结性能
组合桥面
超高性能混凝土
bridge engineering
ultra-thin wear layer
bonding performance
composite deck
ultra-high performance concrete
