工业环境SO<sub>2</sub>腐蚀混凝土损伤本构模型研究

牛荻涛; 吴鸿渠; 黄杰; 吕瑶; 杨瑞希

doi:10.3724/j.gyjzG24021904

工业环境SO₂腐蚀混凝土损伤本构模型研究

doi: 10.3724/j.gyjzG24021904

1. 西安建筑科技大学土木工程学院, 西安 710055;
2. 西安建筑科技大学绿色建筑全国重点实验室, 西安 710055

基金项目:

国家自然科学基金项目(52078413)。

详细信息

作者简介:
牛荻涛,博士,教授,博士生导师,主要从事混凝土结构耐久性方面的研究。电子信箱:niuditao@163.com。

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出版历程
- 收稿日期: 2024-02-19
- 网络出版日期: 2024-09-19

Damage Constitutive Model of Concrete Under Industrial SO₂ Corrosive Environment

1. School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;
2. State Key Laboratory of Green Building, Xi'an University of Architecture and Technology, Xi'an 710055, China

摘要

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。
- 混凝土 /
- 工业环境 /
- SO₂腐蚀 /
- 损伤层厚度 /
- 损伤本构模型
Abstract: To investigate the stress-strain characteristics of concrete under industrial SO₂ corrosion, and evaluate 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 modulus 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.
- concrete /
- industrial environment /
- SO₂ corrosion /
- damage layer thickness /
- constitutive model

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