摘要
为研究适用于公路路面的水泥混凝土材料粘弹性特征,通过室内制备道路水泥混凝土试件,采用控制位移法进行一次加载、循环加载试验,分别测试了C30水泥混凝土试件分别在0.1、0.3、0.5 mm·min^(-13)种加载速率下的σ-ε曲线。通过对3种加载速率下的σ-ε曲线变化规律并采用割线模量E_s表征水泥混凝土的粘弹性。研究结果表明:水泥混凝土试件σ≤0.8σ_(max)时,σ-ε曲线近似线性增长,该范围可认为是水泥混凝土的弹性工作阶段;当σ≥0.8σ_(max)时,试件出现出较大的粘性变形特征,当应力超出屈服应力后发生脆性破坏。加载速率的不同会影响σ-ε曲线的弹性模量E_c和最大破坏应力σ_(max);E_c随着加载速率的增大而减小,σ_(max)随着加载速率v的增大而增大。
To study the viscoelastic characteristics of cement concrete pavement,the C30 concrete samples were prepared tested of σ-ε curves in the loading rates of 0.1,0.3 and 0.5 mm·min-1,respectively.The samples were tested with single loading mode and repeat loading mode,separately,under the condition of load displacement control.The change rules of σ-ε curves were simulated and the viscoelastic characteristics of cement concrete were investigated by using the secant modulus Es.The result shows that the σ-ε curves increase linearly in general under the condition of σ≤0.8σ_（max） while the samples can be considered as elastomer material.The σ-ε curves increase non-linearly under the condition of σ≥0.8σ_（max） while the samples can be considered as a brittle material.The loading rate can affect the secant modulus Esand the ultimate failure stress limit σ_（max）.As the loading rate increases,the ultimate failure stress σ_（max） increases while the secant modulus Esdecreases.
出处
《河南农业大学学报》
CSCD
北大核心
2017年第4期536-540,共5页
Journal of Henan Agricultural University
基金
交通运输部建设科技项目(2013318J08220)
河北省交通运输厅科技计划项目(Y-201302007)
关键词
道路工程
水泥混凝土
割线模量
粘弹性
road engineering
concrete
secant modulus
viscoelasticity
