工业环境SO2腐蚀混凝土损伤本构模型研究
Damage Constitutive Model of Concrete Under Industrial SO2 Corrosive Environment
牛荻涛 1吴鸿渠 2黄杰 2吕瑶 2杨瑞希2
作者信息
- 1. 西安建筑科技大学土木工程学院,西安 710055;西安建筑科技大学绿色建筑全国重点实验室,西安 710055
- 2. 西安建筑科技大学土木工程学院,西安 710055
- 折叠
摘要
为研究工业环境SO2腐蚀混凝土的应力-应变特征,揭示SO2腐蚀混凝土力学性能损伤规律,开展了工业SO2环境混凝土腐蚀试验,分析了水胶比(0.37、0.47、0.57)、粉煤灰掺量(0％、10％、20％)和不同腐蚀循环次数对混凝土损伤层厚度、应力-应变曲线、峰值应力、峰值应变及弹性模量的影响.基于损伤力学理论,建立工业环境SO2腐蚀混凝土单轴压缩损伤本构模型.结果表明:混凝土损伤层厚度随着SO2循环次数的增加而增大,变化规律符合指数函数关系;SO2腐蚀后混凝土试件的峰值应力下降,峰值应变增加,弹性模量下降,曲线下降段变陡峭,变形能力降低,表现出明显脆性破坏特征.掺加粉煤灰可以减缓SO2腐蚀损伤速率,提高混凝土抵抗SO2腐蚀的能力.
Abstract
To investigate the stress-strain characteristics of concrete under industrial SO2 corrosion,and e-valuate the mechanical characteristics of concrete,the concrete corrosion tests in industrial SO2 environment were conducted to analyze the effects of water-to-cement ratio(0.37,0.47 and 0.57),fly ash content(0％,10％and 20％),and SO2 cycling times on the danage thickness of damage layers,stress-strain curves,peak stress,peak strain,and elastic modulus.A constitutive model was formulated by using the principles of damage mechanics theory.The results indicated that the thickness of the damage layer rose as the quantity of SO2 cycles increased,with the change adhering to an exponential function correlation.The specimens experienced a decrease in peak stress,an increase in peak strain,and a decrease in elastic mod-ulus after being corroded by SO2.The downward slope of the curve became steeper,significantly reducing the deformation capacity and ultimately exhibiting characteristics of a brittle failure.Adding fly ash could mitigate the corrosion rate of SO2 and enhance the concrete resistance against SO2 corrosion.
关键词
混凝土/工业环境/SO2腐蚀/损伤层厚度/损伤本构模型Key words
concrete/industrial environment/SO2 corrosion/damage layer thickness/constitutive model引用本文复制引用
出版年
2024
NETL
NSTL
万方数据