混凝土开裂状态对其内部钢筋锈蚀的影响研究

项目名称： 混凝土开裂状态对其内部钢筋锈蚀的影响研究

项目编号： No.51278495

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 建筑科学

项目作者： 董荣珍

作者单位： 中南大学

项目金额： 80万元

中文摘要： 从物理、化学、物理-化学及电化学理论入手，研究环境因素作用对混凝土开裂状态的影响及裂缝区域介质的传输规律，分析环境因素、裂缝状态、混凝土微环境状态及钢筋表面化学、电化状态的相互影响及作用机制，揭示混凝土开裂状态下其内部钢筋锈蚀萌生机理及发展规律。利用先进的检测设备，实现对钢筋周围混凝土材料微环境状态及钢筋表面化学、电化学状态的动态过程检测，依据检测信息，提炼混凝土开裂状态下其内部钢筋锈蚀的多尺度特征表征参数，基于效应等效原则构建特征参数的时变方程，建立钢筋混凝土的裂缝状态控制方程及钢筋锈蚀发展的数学计算模型。研究钢筋局部锈蚀状态对混凝土结构性能的影响规律，凝炼混凝土性能劣化的表征参数，构建损伤变量，建立钢筋局部锈蚀状态下混凝土性能劣化表征模型。分析裂缝封闭状态对混凝土中钢筋锈蚀的影响规律，提出钢筋锈蚀的裂缝控制理论。

中文关键词： 开裂混凝土；钢筋锈蚀；干湿循环；微环境；计算模型

英文摘要： Based on physics, chemistry, physical chemistry and electrochemistry, the influences of environmental factors on concrete cracking and medium transmission rule through the crack are researched. The reinforcement corrosion producing mechanism and development in cracked concrete are revealed by analyzing the interaction mechanism among environmental factors, cracking state, concrete microenvironment condition and steel surface electrochemical state. Using advanced detection equipments, the dynamic process of concrete microenvironment around reinforcement and steel surface chemistry, electrochemical state are tested. According the test information, multi-scale preferences of reinforcement in cracking concrete is refined. The characteristic parameters time varying function is constructed. Concrete cracking control equation and the mathematical calculation model of corrosion development are built based on the principle of equivalent effect. The influences of local corrosion state of reinforcement on concrete structure performance are studied. The characteristic parameters are concentrated to characterize the concrete structure performance deterioration. Calculation model of concrete deterioration process is established according to constructed damage variables. The crack controlling theory for reinforcement corrosion

英文关键词： cracked concrete；corrosion；drying-wetting cycle；micro-environment；calculation model