摘要
通过硫酸盐腐蚀与疲劳荷载叠加试验,测试了腐蚀疲劳破坏过程中道路混凝土的抗弯拉强度、相对动弹性模量以及饱和面干吸水率,分析了不同腐蚀阶段水化产物的微观结构,同时引入叠加效应系数K对硫酸盐腐蚀与疲劳荷载损伤叠加效应进行表征.结果表明:由于受到疲劳荷载的作用,硫酸盐溶液中的道路混凝土无强度增长,且腐蚀疲劳因子随着时间的增加而迅速降低;硫酸盐腐蚀膨胀产物引起的微裂纹与疲劳荷载产生的裂缝是道路混凝土腐蚀疲劳损伤的主要原因;通过K值的计算,表明了腐蚀损伤和疲劳损伤之间存在相互促进效应.
Based on erosion and fatigue experiment, the flexural strength, the relative dynamic elasticity modulus and the water absorption of the dry saturation surface were measured and the microstructures of concrete at different erosion days were investigated. Also, the coefficient K of combined effect was applied to characterize the superimposed effect of sulfate erosion and fatigue load. The results show that owing to the effect of fatigue load, there is no strength growth phase of the concrete in sulfate solution and the erosion fatigue factor is reduced with the increment of the time. The main reasons of erosion fatigue damage are the expansion products generated by sulfate erosion and the cracks produced by fatigue load. The mutually reinforcing effect of sulfate corrosion and fatigue load can be indicated by the K value calculation.
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2013年第2期249-254,共6页
Journal of Building Materials
基金
国家自然科学基金资助项目(50978031)
"十二五"国家科技支撑计划项目(2011BAE27B04)
中央高校基本科研业务基金资助项目(CHD2011JC018)
关键词
道路混凝土
硫酸盐腐蚀
疲劳荷载
叠加效应
pavement concrete
sulfate corrosion
fatigue load
superimposed effect
