摘要
为了探究环氧树脂黏结剂作用下UHPC/SMA钢桥面铺装体系的层间黏结性能,研究了自研的环氧黏结剂(RS-EVB)的作用机理及其材料性能,通过斜剪试验研究了环氧黏结剂作用下UHPC/SMA层间黏结性能及其影响因素。研究结果表明:①环氧黏结剂的工作性能适宜,拉伸性能满足设计要求(拉伸强度≥3.0 MPa和断裂伸长率≥190%),吸水率低、耐酸碱盐等化学介质好,与进口KD-HYP材料性能相当;②环氧黏结剂自身强度优异,层间主要发生界面黏合破坏而不是环氧黏层内聚破坏;③铺装层层间剪切性能随温度的升高而显著降低,受黏结剂用量、养生时间及UHPC表面粗糙度的影响。环氧黏层材料性能和层间黏结性能优异,使用时应提出有针对性、与施工工艺相适应的材料使用说明,指导工程施工以把控施工质量。
To study the interlayer bonding properties of epoxy-based bonding layer between UHPC and SMA pavement structure,the mechanism and material properties of self-developed epoxy bonding agent(RS-EVB)were studied.The interlayer bonding properties of UHPC/SMA under the action of epoxy binder and its influencing factors were studied by shear test.The results show that:①the epoxy binder has suitable working performance,the tensile property meets the design requirements(tensile strength≥3.0 MPa and elongation at break≥190%).Meanwhile,it has low water absorption and good resistance to chemical media such as acid,alkali and salt,which is comparable to the properties of imported KD-HYP materials;②the epoxy binder has excellent strength that the interlayer adhesion failure occurs mainly,rather than the epoxy cohesive failure.③The interlayer shear performance of pavement decreases significantly with the increase of temperature,which is affected by the amount of adhesive layer,health preservation time and surface roughness of UHPC.The epoxy adhesive layer has excellent material properties and interlayer bonding properties.Therefore,it is necessary to put forward specific instructions for the use of materials that are suitable to the construction technology to guide the construction of the project so as to control the construction quality.
作者
李天
陈露一
张志豪
LI Tian;CHEN Luyi;ZHANG Zhihao(National Key Laboratory for Bridge Intelligent and Green Construction,Wuhan,Hubei 430034,China;China Railway Britech Co.,Ltd.,Wuhan,Hubei 430034,China)
出处
《公路工程》
2024年第4期29-34,41,共7页
Highway Engineering
基金
中铁大桥局集团有限公司科技开发课题项目(2021-28-重点)
湖北省科技厅创新发展项目(2021BLB155)。
关键词
道路工程
UHPC/SMA铺装
环氧黏结层
材料性能
剪切性能
road engineering
UHPC and SMA pavement structure
epoxy adhesive layer
material performance
shear performance
