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高温后水泥砂浆试件抗压性能与变形场演化实验研究
Experimental Study on Compression Resistance Capability and the Evolution of Deformation Field of Cement Mortar Samples after Elevated Temperature
投稿时间: 2016-11-16  最后修改时间: 2017-03-03
DOI:
中文关键词:  高温  水泥砂浆  数字散斑  变形破坏  标准差统计
英文关键词:high temperature  cement mortar samples  digital speckle  deformation & failure  standard deviation statistics
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
王来贵 辽宁工程技术大学力学与工程学院 laigui_wang@qq.com 
陈强 辽宁工程技术大学力学与工程学院 619219426@qq.com 
杨建林 辽宁工程技术大学力学与工程学院材料与工程学院  
刘向峰 辽宁工程技术大学力学与工程学院  
刘囝 辽宁工程技术大学材料与工程学院  
赵月 辽宁工程技术大学材料与工程学院  
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中文摘要:
      摘 要:为研究不同温度作用后水泥砂浆试件的抗压性能及变形破坏规律,对不同温度作用后的试件进行单轴压缩实验,同时采用数字散斑相关方法(DSCM)观测试件局部变形,利用标准差统计分析应变场的变化规律。结果表明:(1)在200℃~800℃温度作用后,高龄期的试件更易发生破坏,试件单轴抗压强度的降低主要是由于水化反应形成的骨架结构在高温作用后发生分解;(2)20℃、200℃和400℃作用后的水泥砂浆试件具有明显的脆性特征,相对而言,600℃和800℃作用后的试件塑性特征明显;(3)局部应变场演化过程分为四个阶段:应变均匀分布阶段、应变成核阶段、应变局部化阶段和破坏阶段;(4)利用标准差统计应变场表征试件变形的不均匀程度,与试件整体应力-应变曲线对比,在接近峰值应力时,应变场标准差急剧增大,表明试件即将发生破坏,为预测高温作用后水泥基材料的变形破坏提供了参考。
英文摘要:
      Abstract: In order to study the compression resistance capability and deformation failure law of cement mortar samples after different temperature action, uniaxial compression experiment of cement mortar samples after different temperature gradient, Lateral deformation field has been observed by digital speckle correlation method (DSCM), the change law of strain field was analyzed based on statistical learning theory. Experimental results show that:(1) in temperature gradient range 200℃ to 800℃,the failure of high curing age of cement mortar samples are more likely to occurs, decreased of cement mortar samples’uniaxial compressive strength are due to decomposition of structural framework formed through hydration reaction after high temperature effect; (2) cement mortar samples have obvious brittle feature when temperature is 20℃、200℃ and 400℃, plastic characteristics of cement mortar samples are obvious relatively when temperature is 600℃ and 800℃; (3) the evolution process of deformation field in sample lateral can be divided into four stages: strain well-distributed stage, strain nucleation stage, strain deformation localization stage and failure stage; (4)standard deviation was used to analyze statistical information of strain filed, which is the characterization of uneven level, the standard deviation of strain steep rise when stress approch to peak value, which shows that samples will damaged. It provides reference for the prediction of cement-based materials’ deformation and failure.
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