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首页> 外文会议>First European Workshop on Structural Health Monitoring 2002, Jul 10-12, 2002, Cachan (Paris), France >Fibreoptical In-Situ Evaluation of Corrosion Processes in Reinforced Concrete
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Fibreoptical In-Situ Evaluation of Corrosion Processes in Reinforced Concrete

机译：钢筋混凝土腐蚀过程的光纤现场评估

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In the near future the investments for maintenance of buildings will exceed the investments for new buildings. The maintenance costs, of which about 95% are financed by private investors, are estimated to 150 to 225 milliard (EUD) per year in Germany, which makes it clear, that there is a need for lowering maintenance costs. Monitoring of mechanical and chemical parameters in buildings could reduce the costs, because damages could be predicted before they actually emerge. For supervision of chemical attacks we developed fibreoptical sensors, which allow an in-situ non-destructive long-term monitoring. They are optimised for the use in reinforced concrete, because it is one of the most important building materials in modern civil engineering. The combination of concrete with prestressing gives reinforced concrete a high resistance against tensile strength. Corrosion processes, the probably most common and dangerous chemical attacks on reinforced concrete, are directed against the reinforcement. For the evaluation of corrosion processes the most significant material parameters to be determined are pH-value and chloride concentration. The pH-value is important, because the embedded steel structures exhibit a protection against oxidising only at pH-values of 9.5 or higher. The aggressive chloride ions attack the steel structures by pitting corrosion. For the pH-value a fibreoptical sensor is described, which can be integrated in an also introduced measurement system allowing remote controlling by the internet. Furthermore we present for the first time a new indicator dye for detecting chloride ions, which shows long-term stability in aggressive media of pH 10 to 13.
机译：在不久的将来，建筑物维护的投资将超过新建筑物的投资。维护成本（其中约95％由私人投资者提供）估计在德国每年为150到225毫安（EUD），这清楚地表明，有必要降低维护成本。监视建筑物中的机械和化学参数可以降低成本，因为可以在实际出现损坏之前对其进行预测。为了监督化学攻击，我们开发了光纤传感器，该传感器可以进行原位无损长期监控。它们被优化用于钢筋混凝土，因为它是现代土木工程中最重要的建筑材料之一。混凝土与预应力的结合使钢筋混凝土具有较高的抗拉强度。腐蚀过程（可能是钢筋混凝土上最常见，最危险的化学侵蚀）直接针对钢筋。为了评估腐蚀过程，要确定的最重要的材料参数是pH值和氯化物浓度。 pH值很重要，因为仅在9.5或更高的pH值下，嵌入的钢结构才显示出抗氧化的保护作用。腐蚀性氯离子通过点蚀腐蚀钢结构。对于pH值，描述了一种光纤传感器，可以将其集成到也引入的测量系统中，该测量系统允许通过Internet进行远程控制。此外，我们首次展示了一种用于检测氯离子的新型指示剂染料，该染料在pH 10至13的侵蚀性介质中显示出长期稳定性。

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