工业环境SO_(2)腐蚀混凝土损伤本构模型研究  

Damage Constitutive Model of Concrete Under Industrial SO_(2)Corrosive Environment

作　　者：牛荻涛[1,2] 吴鸿渠 黄杰 吕瑶[1] 杨瑞希 NIU Ditao;WU Hongqu;HUANG Jie;LUY Yao;YANG Ruixi(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;State Key Laboratory of Green Building,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[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

出　　处：《工业建筑》2024年第8期96-103,共8页Industrial Construction

基　　金：国家自然科学基金项目(52078413)。

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。To investigate the stress-strain characteristics of concrete under industrial SO_(2) corrosion,and evaluate the mechanical characteristics of concrete,the concrete corrosion tests in industrial SO_(2) 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 SO_(2) 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 SO_(2) 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 SO_(2).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 SO_(2) and enhance the concrete resistance against SO_(2) 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 

分 类 号：TU528[建筑科学—建筑技术科学]