摘要
CRTSⅡ型板式无砟轨道充填层CA砂浆与轨道板接触面之间常见脱粘、离缝情况。为探讨CA砂浆在温度疲劳作用下与轨道板脱粘、离缝规律,采用-20℃到60℃的温度循环对试件进行疲劳试验,并对疲劳后的试件进行微观结构分析和热分析。结果表明:由于沥青基体在温度疲劳作用下的迁移、老化、黏性降低,CRTSⅡ型CA砂浆和轨道板混凝土经过16次循环后即出现脱粘,产生裂缝。
There are common debonding phenomenon between the track slab surface and CA mortar in CRTSⅡslab-type ballastless track f illing layer. In order to explore the discipline of debonding betw een the slab and C A mortar under the effect of temperature fatigue,the fatigue test was carried out on the test pieces by using -20 ℃ to 60 ℃ temperature cycle,microstructure analysis and thermal analysis was performed for test pieces after fatigue test. The research results showed that debonding between the slab concrete and CA mortar appears after 16 times cycle as the migration,aging and viscosity decrease of asphalt matrix under the effect of temperature fatigue.
出处
《铁道建筑》
北大核心
2015年第2期134-136,共3页
Railway Engineering
基金
中央高校基本科研业务费专项资金资助项目(2682013CX043)
