低温和纳米SiO_(2)对改性CA砂浆疲劳性能的影响  

Effect of Low Temperature and Nano-SiO_(2) on Fatigue Properties of CA Mortar

作　　者：郑建军[1] 王炯杰[1] 吴熙 郑宁 孙苗苗 刘嘉英 Zheng Jianjun;Wang Jiongjie;Wu Xi;Zheng Ning;Sun Miaomiao;Liu Jiaying(College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310032,China;Department of Civil Engineering,Hangzhou City University,Hangzhou 310015,China;Zhejiang Engineering Research Center of Intelligent Urban Infrastructure,Hangzhou 310015,China)

机构地区：[1]浙江工业大学土木工程学院,杭州310032 [2]浙大城市学院土木工程系,杭州310015 [3]城市基础设施智能化浙江省工程研究中心,杭州310015

出　　处：《科技通报》2025年第4期80-85,共6页Bulletin of Science and Technology

基　　金：浙江省自然科学基金项目(LY20E080006);浙大城市学院科研培育基金项目(X-202107)。

摘　　要：水泥乳化沥青砂浆是高速铁路无砟轨道板的垫层材料,作为一种温度敏感性材料,温度的变化将影响列车荷载作用下CA砂浆的疲劳性能,进而影响无砟轨道板的耐久性。为了研究温度、纳米SiO_(2)对CA砂浆疲劳性能产生的影响。本文开展了不同温度(-20、0、15℃)、纳米SiO_(2)掺量(0%、1%)下的等幅抗压疲劳试验。研究结果表明:温度越低,CA砂浆因疲劳荷载作用产生的塑性变形越小,抗压疲劳性能越强;疲劳荷载作用下,CA砂浆的累积残余变形随试验进行呈“三阶段”变化,低温(-20℃)下,稳定变形阶段更为持久,但最终破坏更为迅速;纳米SiO_(2)的掺入对CA砂浆疲劳性能起到正面作用,增加稳定变形阶段的同时明显提高其疲劳寿命。研究结果为进一步优化高速铁路无砟轨道的疲劳性能提供理论支撑。Cement emulsified asphalt mortar is the bedding material for ballast track slabs of high-speed railroads,and as a temperature-sensitive material,the change of temperature will affect the fatigue performance of CA mortar under the action of train load,which in turn will affect the durability of ballast track slabs.In order to study the effects of temperature and nano-SiO_(2) on the fatigue performance of CA mortar.Equal amplitude compressive fatigue tests were carried out at different temperatures(-20,0,15 ℃) and nano-SiO_(2) doping(0%,1%).The results show that:the lower the temperature,the smaller the plastic deformation of CA mortar due to fatigue loading,the stronger the compressive fatigue performance;under fatigue loading,the cumulative residual deformation of CA mortar with the test was a “three-phase” change,low temperature(-20 ℃),stable deformation phase is more persistent,but the final destruction is more rapid;The incorporation of nano-SiO_(2) plays a positive role in the fatigue performance of CA mortar,increasing the stable deformation stage and significantly improving its fatigue life.The results of the study provide theoretical support for further optimizing the fatigue performance of high-speed railroad ballast track.

关 键 词：疲劳性能 CA砂浆 纳米材料 疲劳寿命 温度 

分 类 号：U214.1[交通运输工程—道路与铁道工程]