摘要
针对再生骨料混凝土受冻融损伤的问题,选取再生粗、细骨料双掺成型再生混凝土,采用快速冻融方法研究其质量损失与相对动弹性模量变化的规律,基于Weibull概率方法以质量损失和相对动弹性模量为指标建立损伤模型进行冻融可靠度分析。结果表明,在冻融循环下质量损失逐渐增大,相对动弹性模量逐渐变小;Weibull概率分布可有效地描述再生混凝土试件抗冻性能退化规律,可靠度指标中,质量损失较动弹性模量更敏感,基于试验数据,运用该方法建立的可靠度函数能够直观反映试件可靠性与冻融循环之间的关系,并反映试件的剩余寿命。
Aiming at the problem of freeze-thaw damage of recycled aggregate concrete,recycled concrete with double coarse aggregate and fine aggregate were selected,the law of mass loss and relative dynamic elastic modulus were studied by means of rapid freezing and thawing.Based on Weibull probability method,the damage model was established with mass loss and relative dynamic elastic modulus as indexes to analyze the freeze-thaw reliability.The results show that the mass loss increases and the relative dynamic elastic modulus decreases under freeze-thaw cycles,Weibull probability distribution can describe the degradation law of recycled concrete specimens effectively.In the reliability index,the mass loss is more sensitive than the dynamic elastic modulus.Based on the test data,the reliability function established by this method can reflect the relationship between the reliability and freeze-thaw cycle directly,and reflect the residual life of the specimens.
作者
焦隽隽
朱俊锋
JIAO Junjun;ZHU Junfeng(College of Applied Engineering, Henan University of Science and Technology, Sanmenxia 472000, China;Sanmenxia Polytechnic, Sanmenxia 472000, China;School of Civil Engineering, Henan University of Science and Technology, Luoyang 471000, China)
出处
《硅酸盐通报》
CAS
北大核心
2020年第4期1145-1152,共8页
Bulletin of the Chinese Ceramic Society
基金
青海省科技厅基础研究计划项目(2017-ZJ-787)。
