摘要
针对高速铁路个别地段CRTSⅡ型板式无砟轨道混凝土支承层出现表面剥落损伤的问题,对损伤及邻近位置健康的支承层混凝土进行现场钻芯,通过pH值测试、X射线衍射分析、孔结构和气泡特征参数分析研究了芯样混凝土水化产物的组成及微结构特征,并调研了当地近20年雨水、冰雪等气象资料,进而分析损伤原因。结果表明:可排除化学侵蚀引起的支承层混凝土耐久性损伤;冬季负温天数增加、负温天气降水量增加等造成的冻融损伤破坏是支承层混凝土损伤的主要原因。
Aiming at the problem of surface spalling damage of CRTSⅡslab ballastless track concrete bearing layer in individual sections of high speed railway,the field core drilling was carried out for the damaged and adjacent healthy bearing layer concrete.The composition of hydration products and microstructure of bearing layer concrete were studied by pH test,X⁃ray diffraction,MIP analysis and bubble characteristic parameters test,and the local meteorological data such as rain,ice and snow in recent 20 years were investigated to analyze the causes of concrete damage.The results show that the durability damage of bearing layer concrete caused by chemical erosion can be eliminated.The freeze-thaw damage caused by the increase of negative temperature days and negative temperature precipitation in winter is the main reason for the damage of bearing layer concrete.
作者
杨怀志
刘学文
杨志强
YANG Huaizhi;LIU Xuewen;YANG Zhiqiang(Beijing-Shanghai High Speed Railway Co.Ltd.,Beijing 100038,China;Southeast University,Nanjing 210089,China)
出处
《铁道建筑》
北大核心
2021年第8期119-122,共4页
Railway Engineering
基金
中国铁路总公司科技研究开发计划(P2018G005)。
关键词
高速铁路
损伤机理
试验研究
支承层混凝土
孔结构
含气量
混凝土冻融
high speed railway
damage mechanism
experimental study
bearing layer concrete
pore structure
gas content
concrete freeze-thaw
