典型工业腐蚀环境混凝土中性化与钢筋锈蚀行为研究

工业建筑是支撑工业生产的重要基础设施，其安全运行对国民经济发展有非常重要的作用。许多工业建筑长期处于腐蚀、高温、高湿等不利环境，混凝土耐久性问题非常突出，而已有的混凝土结构耐久性研究成果不能解决工业腐蚀环境混凝土耐久性问题。本课题针对典型工业腐蚀环境混凝土耐久性特点，采用工程调查、模拟试验、理论分析与数值模拟相结合的方法，围绕多因素耦合作用混凝土中性化与钢筋锈蚀行为开展系统研究。开展典型工业腐蚀环境调查分析，建立环境参数时空分布模型；开展混凝土硫化试验与SO2和CO2共同作用混凝土中性化试验，研究混凝土性能退化规律，揭示SO2与CO2耦合作用混凝土中性化机理和高温、高湿及热湿耦合对混凝土传输性能的影响机理，建立混凝土中性化模型；研究典型工业腐蚀环境混凝土中钢筋锈蚀机理与规律，建立钢筋开始锈蚀和锈胀开裂条件计算模型。为科学评估既有工业建筑混凝土结构耐久性与使用寿命提供理论依据和技术支撑。

Industrial buildings are the important infrastructures to support industrial manufacture, and its safety plays an important role in the development of the national economy. Many industrial buildings are often subjected to the combined actions of high concentrations of corrosive medium, high temperature, and high humidity. Therefore, the durability of the industrial concrete structure is a serious problem. However, the existing research results of concrete structure durability cannot be applied to industrial buildings. Based on the durability characteristics of concrete in typical industrial corrosive environment, this project will conduct a systematic study on the concrete neutralization and the steel bars corrosion behavior considering the coupled effects of multifactor. The engineering investigation, simulation experiment, theoretical analysis and numerical simulation will be adopted. Firstly, investigation and analysis of environmental parameters of typical industrial corrosive environment will be carried out and their spatiotemporal distribution model will be established. Furthermore, the concrete sulfuration test and the neutralization test under the combined action of SO2 and CO2 will be carried out, to study the performance degradation and neutralization mechanisms of concrete under the coupling actions of SO2 and CO2, and the influence of high temperature, high humidity, and coupling of heat and moisture on the concrete transmission performance. On this basis, the neutral model of concrete will be established. Finally, according to study the mechanisms and whole process of steel bars corrosion in the typical industrial environment, the models for steel bars initial corrosion and concrete cover cracking due to corrosion expansion will be established. The research results will provide theoretical basis and technical support for the scientific evaluation durability and service life of existing concrete structures in the typical industrial environment.