摘要
为了研究复掺纳米混凝土在冻融循环和复合盐卤侵蚀双因素服役环境下疲劳损伤的本构关系,以非线性累积损伤理论为基础并引入动弹性模量表征损伤度,建立了简单、统一的复掺纳米混凝土复合盐冻疲劳损伤的本构模型,探讨了冻融循环和复合盐卤侵蚀耦合作用对纳米混凝土疲劳损伤的影响机理,同时采用室内快速冻融试验对纳米混凝土的强度疲劳性能进行了测试和模型验证。结果表明,基于非线性累积损伤理论的盐冻疲劳损伤本构模型的预测结果与试验结果相比较准确率达86.36%,该模型能够较好地表征纳米混凝土在复合盐冻作用下的性能演变,比较符合实际工程环境,为有抗复合盐冻要求的服役混凝土耐久性设计研究提供了新思路。
The constitutive relationship of fatigue damage of compound mixed nanoconcrete was studied under the service environment of the composite brine erosion and freeze⁃thaw cycle.The study was based on the nonlinear cumulative damage theory and the dynamic elastic modulus was introduced to represent the damage degree.A simple and unified constitutive model of fatigue damage of nanoconcrete was established,and the mechanism of the fatigue damage was discussed in the coupling of composite brine erosion and freeze⁃thaw cycle.At the same time,the strength fatigue performance of nanoconcrete was tested and constitutive model was verified with indoor rapid freeze⁃thaw test.It was showed that the constitutive model can characterize the performance evolution of nanoconcrete under the composite brine erosion and freeze⁃thaw cycle,the accuracy of the prediction results of the model compared with the test results was 86.36%.The model was more in line with the actual engineering environment,a new idea was provided for study on the durability design of concrete under the composite brine erosion and freeze⁃thaw cycle.
作者
陈正伟
许桂霞
CHEN Zhengwei;XU Guixia(School of Road and Bridge Engineering,Guangxi Transport Vocational and Technical College,Nanning 530023,China;Guangxi Zhuang Autonomous Region Institute of Science and Technology Information,Nanning 530001,China)
出处
《材料导报》
CSCD
北大核心
2023年第S02期254-259,共6页
Materials Reports
基金
广西科技发展战略研究专项(桂科ZL23014003)。
关键词
本构模型
纳米混凝土
非线性累积损伤理论
复合盐侵和冻融耦合
constitutive model
nano⁃concrete
nonlinear cumulative damage theory
composite brine erosion and freeze⁃thaw coupling
