摘要
通过对经历不同冻融循环次数(N=0、25、50、75、100、125、150)的再生混凝土立方体试块进行单轴受压试验,研究了冻融循环次数对再生混凝土应力应变全曲线的的影响,揭示了冻融循环次数对再生混凝土峰值应力、峰值应变和弹性模量的影响规律.试验结果表明,随着冻融循环次数的增加,再生混凝土峰值应力和弹性模量呈现减小趋势,峰值应变逐渐增大,应力-应变曲线趋于扁平.在此基础上建立了考虑冻融循环次数的再生混凝土单轴受压本构模型及参数的数学表达式,特征参数呈现出明显的规律性变化,试验结果对再生混凝土的应用和研究有一定参考价值。
Through the uniaxial compression test of recycled concrete cube specimens with different numbers freeze-thaw cycles(N=0,25,50,75,100,125,150).The influence of the number of freeze-thaw cycles on the stress-strain curve of recycled concrete was studied.The effect of freezing-thawing times on peak stress,peak strain and elastic modulus of recycled concrete were established.The experimental results of recycled concrete under uniaxial compression show that with the increase of freeze-thaw cycles,the peak stress and elastic modulus of recycled concrete tend to decrease,the peak strain increases gradually,the stress-strain curve tends to be flat.Finally,the statistical damage models and the formula expressing the parameters for recycled concrete under uniaxial compression is proposed,which consider the number of freezing and thawing cycles.The characteristic parameters change with obvious regularity.And the test results have some consultative value of application and study of recycled concrete.
作者
白卫峰
王维利
苑晨阳
黄爽
BAI Weifeng;WANG Weili;YUAN Chenyang;HUANG Shuang(School of Water Conservancy,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;Henan Provincial Hydraulic Structure Safety Engineering Research Center,Zhengzhou 450046,China)
出处
《混凝土》
CAS
北大核心
2021年第6期9-12,共4页
Concrete
基金
国家重点研发计划项目(2018YFC0406803)
国家自然科学基金资助项目(51679092,51779095)。
关键词
再生混凝土
冻融循环
单轴受压
应力应变关系
本构模型
recycled concrete
freezing-thawing cycle
uniaxial compression
stress-strain relationship
constitutive model
