The microstructure evolution of ballastless track high-strength concrete exposed to compressive and flexural fatigue loads

被引：15

作者：

Yang, Zhiqiang ^{[1
,2
]}

Li, Huajian ^{[1
,2
,3
]}

Wen, Jiaxin ^{[1
,4
]}

Huang, Fali ^{[1
,2
]}

Wang, Zhen ^{[1
,2
]}

Yi, Zhonglai ^{[1
,2
]}

Xie, Yongjiang ^{[1
,2
]}

Dong, Haoliang ^{[1
,4
]}

机构：

[1] China Acad Railway Sci Corp Ltd, Railway Engn Res Inst, Beijing 100081, Peoples R China

[2] State Key Lab High Speed Railway Track Technol, Beijing 100081, Peoples R China

[3] Beijing Jiaotong Univ, Sch Civil Engn, Beijing 100044, Peoples R China

[4] China Acad Railway Sci, Grad Sch, Beijing 100081, Peoples R China

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2023年 / 166卷

基金：

中国国家自然科学基金;

关键词：

Ballastless track; High -strength concrete; Fatigue; Microstructure; X; -CT; DAMAGE; INTERFACE; MECHANISM; BEHAVIOR; PAVEMENT; CRACKING; MODEL;

D O I：

10.1016/j.ijfatigue.2022.107247

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

X-ray micro-CT method was applied to reveal the microstructure evolution of ballastless track high-strength concrete under fatigue loads. The CT image, porosity, pore volume distribution and aspect ratio of pores were analyzed. Results show that a visible crack is formed at stage II when concrete is under compressive fatigue loads. However, the pores around the interface transfer zone of compressive zone concrete are connected at stage III for concrete under flexural fatigue loads. As the microstructure of concrete is damaged and the single pores tend to be connected, the aspect ratio of pores is generally decreased during fatigue damage.

引用

页数：9

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