Assessing the permeability of concrete is crucial as it governs the transport of aggressive agents, such as chlorides and carbon dioxide, which are key factors in the degradation mechanisms. Moreover, concrete’s permeability constitutes an essential input parameter for durability models. Concrete’s permeability can be measured directly (by experimental methods) or indirectly by fitting a transport model to saturation degree profiles. In this paper, we introduce a novel indirect method for estimating the permeability by monitoring the saturation degree profiles with embedded resistivity sensors. These embedded resistivity sensors are used for the evaluation of the saturation degree profiles over time during two experiments: drying and imbibition with tap water. Firstly, measured resistivity profiles are converted to saturation degree profiles, using a calibration curve established on concrete cores of the same formulation. Concrete’s permeability is then estimated by fitting a hydric transport model to the experimental saturation degree profiles. Permeability values estimated using the embedded sensor are compared to those obtained by two reference methods: assessing the mass loss of a non-monitored specimen subjected to drying and saturation degree profiles obtained by gammadensimetry measurements. The permeability values obtained with the monitoring method are consistent for drying and imbibition experiments and fall within the range of values found in the literature. This is very promising for the continuous monitoring of concrete by embedded resistivity sensors.

中文翻译：

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使用嵌入式电阻率传感器监测混凝土的干燥和渗吸，以估计渗透率


评估混凝土的渗透性至关重要，因为它控制着氯化物和二氧化碳等腐蚀性物质的运输，而这些物质是降解机制的关键因素。此外，混凝土的渗透率构成了耐久性模型的基本输入参数。混凝土的渗透率可以直接（通过实验方法）测量，也可以通过将输运模型拟合到饱和度剖面来间接测量。在本文中，我们介绍了一种新的间接方法，通过使用嵌入式电阻率传感器监测饱和度剖面来估计磁导率。这些嵌入式电阻率传感器用于在两个实验中评估饱和度随时间的变化：自来水干燥和吸水。首先，使用在相同配方的混凝土芯上建立的校准曲线，将测得的电阻率剖面转换为饱和度剖面。然后，通过将水力输运模型拟合到实验饱和度剖面来估计混凝土的渗透率。将使用嵌入式传感器估计的渗透率值与通过两种参考方法获得的渗透率值进行比较：评估未经监测的样品在干燥和饱和度剖面下的质量损失，以及通过 gammadensimetry 测量获得的饱和度分布。使用监测方法获得的渗透率值对于干燥和渗吸实验是一致的，并且属于文献中的值范围。这对于通过嵌入式电阻率传感器对混凝土进行连续监测非常有前途。