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首页> 外文期刊>Magazine of Concrete Research >Development of a microwave frequency sensor for the long-term localised moisture monitoring of concrete
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Development of a microwave frequency sensor for the long-term localised moisture monitoring of concrete

机译：微波频率传感器的开发，用于混凝土的长期局部湿度监测

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Monitoring the moisture levels in concrete over long periods of time is important, as moisture plays a pivotal role in the corrosion process of embedded reinforcement steel in concrete. It is also key in a number of other deterioration processes, and can be used as an indication of changes in the conditions, thus providing a useful early warning system for potential chemical attack. Maintenance needs are thus flagged up before damage is caused. Following an overview of these deterioration processes in concrete, this paper outlines the development of a microwave frequency sensor operating at around 1 GHz and utilising a transmission line either embedded into the concrete at the time of production or encapsulated in a porous medium and inserted into the concrete. It has been amply demonstrated that the method is capable of measuring the moisture content over a wide dynamic range, up to saturation. Trials showed that the encapsulating medium has necessarily to have a microstructure similar to the concrete to be monitored to ensure effective tracking of the concrete moisture content. The sensor appears to fulfil the various stringent conditions necessary for long-term condition monitoring of concrete structures.
机译：长期监测混凝土中的水分含量很重要，因为水分在混凝土中嵌入的钢筋腐蚀过程中起着关键作用。它在许多其他恶化过程中也很关键，可以用作条件变化的指示，从而为潜在的化学侵蚀提供了有用的预警系统。因此，在造成损坏之前就提出了维护需求。在概述了混凝土中的这些劣化过程之后，本文概述了工作在1 GHz附近的微波频率传感器的开发情况，该微波传感器利用了生产时嵌入混凝土中或封装在多孔介质中并插入其中的传输线。具体。已经充分证明了该方法能够在很宽的动态范围内测量水分含量，直至饱和。试验表明，封装介质必须具有与要监测的混凝土相似的微观结构，以确保有效跟踪混凝土的水分含量。该传感器似乎满足了对混凝土结构进行长期状态监测所必需的各种严格条件。

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