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首页> 外文会议>Eurocorr 2004 >Corrosion modelling in cracked reinforced concrete structures:a probabilistic approach
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Corrosion modelling in cracked reinforced concrete structures:a probabilistic approach

机译：钢筋混凝土开裂结构的腐蚀建模：一种概率方法

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The impact of steel corrosion on the durability of reinforced concrete structures hassince a long time been the concern in civil engineering. Deleterious mechanism is attributedto the progressive formation of an expansive corrosion product at the steel-concrete interface.A general two-stage corrosion modelling has been accepted widely: (I) firstly an incubationperiod for the aggressive agents, e.g. the chloride ions and the carbonation front, to penetrateform the structure surface to the steel interface; (ii) then an uprising degradation stagecharacterized by the concrete cover spalling caused by the accumulating internal pressure atsteel-concrete interface from the product expansion.With a physical modelling of the penetration, the two-stage scheme can be adopted to assessquantitatively the lifetime of corrosion affected structures for a chloride case. So far, theresearch attention is mainly given to the corrosion and induced deterioration in an intactconcrete, implying that corrosion is taken as the only degradation source. However, in thepractical consulting work, one is often confronted to another large category of problemsconcerning the reinforcement corrosion in an already cracked concrete. This cracking can beinduced by other factors other than corrosion, e.g. the creep and the shrinkage, or just thereinforced concrete working cracks. So, how to quantify the corrosion process and itsdegradation consequence with the presence of cracking is thus of a great interest for the longterm structural durability. This aspect concerns the newly-designed concrete structure as wellas the existing ones. For the new structures, it permits to evaluate the possible alteration of theservice life considering the possible cracking presence in the structure while for the existingones it helps to give a quantitative assessment to the structures' residual service life.To this end, this paper proposes a modelling for the corrosion process in a cracked concretewhere both concrete carbonation and chloride penetration are taken into consideration. A newelementary representative volume is established for the corrosion in cracked concrete andrecent experimental investigations are used to calibrate the modelling.The model has also been coupled to probabilistic tools that allow to perform not onlydeterministic simulation but probabilistic ones. Then, results are not obtained in terms ofmean values but described the probability of exceeding a limit state function previouslydefined. An application of this approach on a real structure is presented.
机译：长期以来，钢腐蚀对钢筋混凝土结构耐久性的影响一直是土木工程中关注的问题。有害的机理归因于在钢-混凝土界面上逐渐形成膨胀的腐蚀产物。一般的两阶段腐蚀模型已被广泛接受：（I）首先是腐蚀剂的保温期，例如：氯离子和碳酸化前沿，从结构表面渗透到钢界面。 （ii）由产品膨胀引起的钢筋混凝土界面处的内部压力累积引起的混凝土覆盖层剥落引起的起义降解阶段。通过渗透的物理模型，可以采用两阶段方案来定量评估腐蚀的寿命氯化物情况下受影响的结构。到目前为止，研究的重点主要放在完好混凝土上的腐蚀和诱发的劣化上，这意味着腐蚀被视为唯一的降解源。然而，在实际的咨询工作中，经常会遇到另一类与已开裂的混凝土中的钢筋腐蚀有关的问题。这种开裂可能是由腐蚀以外的其他因素引起的，例如。蠕变和收缩，或者只是钢筋混凝土工作裂缝。因此，如何量化腐蚀过程及其在开裂下的降解结果对长期的结构耐久性具有重大意义。这方面涉及新设计的混凝土结构以及现有的混凝土结构。对于新结构，它允许考虑结构中可能存在的裂纹来评估使用寿命的可能变化，而对于现有结构，则有助于对结构的剩余使用寿命进行定量评估。为此，本文提出了一种方法。在考虑混凝土碳化和氯化物渗透的情况下对开裂混凝土的腐蚀过程进行建模。建立了用于开裂混凝土腐蚀的新的基本代表体积，并使用了最近的实验研究来对模型进行校准。该模型还与概率工具耦合，该工具不仅可以执行确定性模拟，而且可以执行概率模拟。然后，没有获得关于平均值的结果，而是描述了超过先前定义的极限状态函数的概率。提出了这种方法在实际结构上的应用。

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