首页|无砟轨道水泥基材料表层强化方法与作用机理

无砟轨道水泥基材料表层强化方法与作用机理

Surface Strengthening Methods and Mechanism of Cementitious Materials for Ballastless Track

扫码查看
原文链接
  • 维普
  • 万方数据
由于受到外界环境的影响,高速铁路无砟轨道水泥基材料服役性能逐渐降低.采用渗透结晶材料和环氧树脂对水泥基材料表面进行涂刷处理,通过试验对比表面处理对水泥基材料力学性能、耐磨性能、抗冻性能、抗氯离子渗透性能和微观结构的影响.结果表明:表面涂刷渗透结晶材料和涂刷环氧树脂均可以提高砂浆表面回弹强度和混凝土所能经受的冻融循环次数并降低氯离子扩散系数.与处理前相比,表面涂刷渗透结晶材料和环氧树脂后,表面回弹强度分别提高了5.0%、10.1%,冻融循环次数分别增加140次和183次以上(相对动弹性模量60%),氯离子渗透系数分别降低64.0%、92.5%,环氧树脂的提升效果更显著,但会受材料老化影响而效果变差;与处理前相比,涂刷渗透结晶材料可提高砂浆的力学性能(抗压强度提高11.5%),涂刷环氧树脂可增强砂浆的耐磨性能(磨损质量减少19.5%).因此,可根据应用环境选择合适的表面涂刷材料,频繁暴露在高温、臭氧、紫外线等易老化环境中或需要提高强度时宜选择渗透结晶材料,主要受冻融破坏、有害离子侵入、磨蚀破坏等环境因素影响时宜选择环氧树脂.
Due to the influence of external environment,the service performance of cementitious materials for ballastless track of high speed railway gradually declines.The surface of cementitious materials is coated with two types of materials,permeable crystallization materials and epoxy resins.The effects of surface treatment on the mechanical properties,wear resistance,frost resistance,anti-chloride ion permeability and microstructure of cementitious materials were compared through experiments.The results show that surface coating with permeable crystallization materials and epoxy resins can improve the surface rebound strength of cementitious materials and increase the number of freeze-thaw cycles,and reduce the chloride ion diffusion coefficient.Compared with the pre-treatment,the surface rebound strength was improved by 5.0%and 10.1%,the number of freeze-thaw cycles was increased by 140 and more than 183 respectively(relative dynamic modulus of elasticity 60%),and the chloride ion diffusion coefficient were reduced by 64.0%and 92.5%after the surface was coated with the permeable crystallization material and epoxy resin.Epoxy resins provide more significant performance enhancement,but are subject to failure due to aging of the material.Compared with the pre-treatment,the application of the permeable crystallization material also improved the mechanical properties of the cementitious material with an increase in compressive strength of 11.5%and the application of the epoxy resin enhanced the wear resistance of the cementitious material with a reduction of 19.5%in abrasion mass.Thus,selecting appropriate surface treatment materials depends on the application environment,with permeable crystallization materials suitable for environments prone to aging and epoxy resin ideal for addressing freeze-thaw,ion intrusion,and abrasion damage.

engineering materialsurface strengtheningcementitious materialspermeable crystallization materialsepoxy resinmechanical performancedurability

张旭、冯浩、周骏、吴世翔、庞浩、王永冕、刘竞

展开 >

中国铁道科学研究院集团有限公司 铁道建筑研究所,北京 100081

中国铁道科学研究院集团有限公司高速铁路轨道系统全国重点实验室,北京 100081

中国铁路兰州局集团有限公司 兰州高铁基础设施段,兰州 730050

中国铁路乌鲁木齐局集团有限公司 乌鲁木齐高铁基础设施段,乌鲁木齐 830011

展开 >

工程材料 表层强化 水泥基材料 渗透结晶材料 环氧树脂 力学性能 耐久性能

中国铁路兰州局集团有限公司科技研发计划中国铁路乌鲁木齐局集团有限公司科技研发计划

2022041-2WLMQ-JGBM-GWB-GTK-2022-0004

2024

10.3969/j.issn.1003-1995.2024.03.24

铁道建筑
中国铁道科学研究院

铁道建筑

北大核心
影响因子：0.623
ISSN：1003-1995
年,卷(期)：2024.64(3)
  • 14