亚热带湿热环境桥梁混凝土锚碇碳化细观研究  

Mesoscopic study on carbonation of bridge concrete anchorage in subtropical humid environment

作　　者：李越 阮欣[1,2] 张少锦 LI Yue;RUAN Xin;ZHANG Shaojin(College of Civil Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Performance Evolution and Control for Engineering Structures(Ministry of Education),Tongji University,Shanghai 200092,China;College of Architecture Science and Engineering,Yangzhou University,Jiangsu Yangzhou 225127,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]工程结构性能演化与控制教育部重点实验室(同济大学),上海200092 [3]扬州大学建筑科学与工程学院,江苏扬州225127

出　　处：《西安建筑科技大学学报（自然科学版）》2023年第4期504-514,共11页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51678435,52078367)。

摘　　要：混凝土碳化问题是目前基础设施长期服役中最为普遍的病害问题,也是相应结构耐久性设计的重点所在.碳化作用发展与环境温湿度关系紧密,在亚热带湿热环境中碳化问题尤为显著.现有研究难以考虑真实环境参数的复杂时变影响,在描述碳化作用空间随机分布和病害涌现时机方面存在不足.因此,本研究聚焦多尺度计算效率精度瓶颈以及亚热带湿热环境时变输入的仿真难点,建立材料碳化机理与结构服役退化的高效传递模型,提出适用于复杂服役环境下大体积混凝土结构碳化分析的扩散路径映射方法.研究依托我国东南沿海地区某桥梁锚碇结构开展细观碳化分析,对长期服役过程碳化深度和钢筋锈蚀概率特征进行预测,求解效率和精度均实现大幅提升.结合具体工程养护策略,预测了防护措施对耐久性能的提升效果,也展现了该方法在大体积混凝土结构耐久性能分析方面的优势.Concrete carbonization is the most common problem in the long-term service of infrastructure,and it is also the key point in the durability design of the corresponding structure.The concrete carbonization is closely related to environmental temperature and humidity,especially in subtropical humid and hot environment.Currently,it is difficult to consider the complex time-varying effects of actual environmental states,and there are deficiencies in describing the spatial random distribution of carbonation and the timing of disease emergence.Therefore,this study focuses on the multi-scale calculation efficiency accuracy and the time-varying input of subtropical humid and hot environment,establishes an efficient transfer model of material carbonation mechanism and structural service degradation,and proposes a diffusion path mapping method suitable for carbonation analysis of large volume concrete structures in complex service environment.Based on the detailed carbonization analysis of a bridge anchorage system in the southeast coastal area of China,the carbonization depth of long-term service process and the probability characteristics of reinforcement corrosion were predicted,and the solving efficiency and accuracy were greatly improved.Combined with specific engineering maintenance strategies,the durability improvement effect of protective measures is predicted,and the advantages of this method in the durability analysis of mass concrete structures are also presented.

关 键 词：混凝土碳化 大体积混凝土 细观模拟 亚热带湿热气候 

分 类 号：TU528[建筑科学—建筑技术科学]