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混凝土构件中钢筋锈蚀速率预计模型研究 【作者】耿欧 【导师】袁迎曙

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6T+A$t8[ fU H1F0混凝土构件钢筋锈蚀速率预计模型研究

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oq!M2so0【作者】耿欧 【导师】袁迎曙水利论文h^I%v$f~ km
【作者基本信息】中国矿业大学,结构工程,2008年,博士

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【中文摘要】 钢筋锈蚀是影响钢筋混凝土结构正常使用和耐久性的主要因素之一,且造成的危害巨大。混凝土中钢筋的锈蚀机理、锈蚀速率的预计以及人工气候环境下钢筋锈蚀与自然气候环境下钢筋锈蚀的相关性已成为目前混凝土结构耐久性研究的热点。本文从混凝土内钢筋锈蚀的电化学基本原理出发,分别对钢筋锈蚀电化学基本模型、顺筋裂缝区钢筋锈蚀速率、横向裂缝区钢筋锈蚀速率、混凝土构件配筋特征对钢筋锈蚀速率的影响、自然气候环境下钢筋锈蚀速率预计模型以及可以埋置在混凝土构件中的钢筋锈蚀速率监测探头等问题进行了较全面的研究,研究成果为锈蚀钢筋混凝土结构的寿命预测和评估以及混凝土结构耐久性设计提供了必要的科学依据。氧气和水是钢筋锈蚀时的必不可少的两个基本要素。在高湿条件下,由于钢筋与混凝土界面附近混凝土的孔隙相对较大,此时在钢筋附近的混凝土孔隙内会形成一定厚度的液态水,钢筋的锈蚀速率主要由氧气扩散速率所控制。在考虑液态水的存在和混凝土构件表面透氧面积的前提下,推导出了高湿条件下钢筋锈蚀速率电化学基本模型;并在此基础上根据钢筋锈蚀阴阳极极化曲线的变化规律,建立了考虑混凝土电阻率影响的一般湿度条件下钢筋锈蚀速率模型,并通过相关的试验研究验...更多证了模型的适用性。根据顺筋锈胀裂缝产生时钢筋锈蚀产物的分布特点和金属腐蚀学中“氧浓差”宏电池的基本原理,建立了顺筋锈胀裂缝区钢筋锈蚀速率预计模型,分析了顺筋裂缝宽度和钢筋锈蚀速率的关系并进行了相关的试验验证。根据横向裂缝产生的机理,通过试验建立了横向裂缝区钢筋与混凝土表界面粘结损伤长度与裂缝宽度、混凝土保护层以及钢筋直径的统计模型;并根据横向裂缝产生时钢筋锈蚀状态和氧气扩散的特点,分别建立了横向裂缝区“钝化-活化”和“氧浓差”宏电池锈蚀下的钢筋锈蚀速率预计模型。总结了混凝土构件截面配筋的一般特点,研究了混凝土构件中变形带肋钢筋和光圆钢筋的锈蚀特征及其锈蚀不均匀性,分析了构件未活化的内部钢筋对外部钢筋锈蚀速率的影响规律;同时研究了箍筋锈蚀的机理及其对纵筋锈蚀速率的影响,并在此基础上建立了混凝土构件中钢筋锈蚀综合预计模型。针对自然环境中温湿度不断变化的特点,提出了月当量温度和月当量湿度的等效计算方法;建立了自然环境下混凝土构件中钢筋锈蚀速率预计的综合模型,为自然气候环境下混凝土结构耐久性的评估和预计奠定了基础。根据钢筋锈蚀电化学检测原理,研制了可以埋入混凝土构件的护环式监测探头,该探头可以和GECOR8钢筋锈蚀速率测试仪配合使用,进行混凝土构件内钢筋锈蚀速率的实时监测。  还原

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Pd+]2[(t)U` ?FK%W0【英文摘要】 Corrosion of steel bar in concrete is one of the main factors affecting the durability of reinforced concrete structure. Corrosion mechanism, corrosion rates prediction, and the relativity of steel bar corrosion rates in artificial climatic laboratory and natural climatic environment have been in the highlight of the concrete field all over the world. In this paper, base on the rationale of steel corrosion, the electrochemistry model of steel bar corrosion, the corrosion rate of steel bar at flexure crack and the longitudinal crack, the infection of the distributed steel bar of section in concrete member, the prediction model of steel bar corrosion rate under nature climatic environment, and the corrosion detector which can be imbed in concrete member, were studied. The research findings enable to provide a scientific basis for the evaluation of reinforcement corrosion and the design of concrete durability.When the steel bar is corroding, the water and oxygen must be existed in the int...更多erface between the steel bar and the concrete. Under high humidity environment, the liquid state water can be formed in the pore around the steel bar and the corrosion rate of steel bar is controled by the diffusion of oxygen. The electrochemistry model is deduced which take the thickness of liquid state water and the area of oxygen diffusion into account. Base the polarization characteristic of the corrosion cathode, consider the influence of the concrete resistivity, the prediction model of corrosion rate under low humidity environment is deduced. The experimentations are also done to confirm the accuracy of the models.Base on the study of distribution characteristics of corrosion rust, the main corrosion mechanism is analysed around the reinforced section. The prediction model of corrosion rate at the corrosive expanding crack is also developed, and the relativity between corrosion rate with crack width is analyzed.Based on experiments, the regress model between the damage length, which the water and oxygen can easily reach, with the crack width and spacing is developed. The prediction model of corrosion rate around transverse crack is also found and the experimentations are also done to confirm the accuracy of the models.The corrosion specificity and the corrosion rate of deformed and plain steel bar are studied, the corrosion rate is influenced by inside inactivation steel bars and the stirrup steel is also considered. The general corrosion model of steel bar in concrete member is found. In nature climate environment, it is difficult to calculate the corrosion rate because the temperature and relative humidity are changed with the time. To build the model, equivalent temperature and relative humidity is used, and the corrosion model is found.Base on the principle of the“linear polarization”technology, a corrosion detector which can be imbed in concrete member, was also studied in this paper. The experimentations show that the test results of the detector are similar to the test result of GECOR8. The can be used for monitoring the corrosion rate of the steel bars in the concrete members.  还原水利论文.bmTJ\F bx Tvi

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【中文关键词】 混凝土; 耐久性; 钢筋锈蚀; 预计模型
"Ak @!Hn1HTa0【英文关键词】 concrete; durability; steel bar corrosion; prediction model

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TAG: 钢筋 混凝土 模型 构件 速率
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