Department of Civil Engineering, Faculty of Engineering (FEUP), University of Porto, 4200-465 Porto, Portugal.
CONSTRUCT-LFC, Department of Civil Engineering, Faculty of Engineering (FEUP), University of Porto, 4200-465 Porto, Portugal.
Sensors (Basel). 2022 Apr 21;22(9):3182. doi: 10.3390/s22093182.
High moisture content is a recurrent problem in masonry and can jeopardize durability. Therefore, precise and easy-to-use techniques are welcome both to evaluate the state of conservation and to help in the diagnosis of moisture-related problems. In this research, the humidification and drying process of two wall specimens were assessed by infrared thermography and the results were compared with two traditional techniques: surface moisture meter and the gravimetric method. Two climatic chambers were used to impose different ambience conditions to each specimen, to evaluate the impact of air temperature and relative humidity in the results. The qualitative analysis of the thermal images allowed the identification of the phenomena. The quantitative analysis showed that the order of magnitude of the temperature gradient that translates high humidity levels is substantially different in the two chambers, pointing to the influence of the surrounding environment. The presented analysis contributes to identifying the criteria indicative of moisture-related problems in two different scenarios and discusses the correlation between the non-destructive techniques and the moisture content in the masonry walls. The limitations and future research gaps regarding the use of IRT to assess moisture are also highlighted.
高湿度是砌体中反复出现的问题，会危及耐久性。因此，精确且易于使用的技术受到欢迎，不仅可用于评估保护状态，还有助于诊断与湿度相关的问题。在这项研究中，通过红外热成像评估了两个墙体样本的加湿和干燥过程，并将结果与两种传统技术进行了比较：表面湿度计和重量法。使用两个气候室对每个样本施加不同的环境条件，以评估空气温度和相对湿度对结果的影响。热图像的定性分析允许识别出这些现象。定量分析表明，在两个房间中，反映高湿度水平的温度梯度量级有很大差异，表明周围环境的影响。所进行的分析有助于在两个不同场景中确定与湿度相关问题的指示性标准，并讨论非破坏性技术与砌体墙壁湿度之间的相关性。还强调了使用 IRT 评估湿度的局限性和未来研究差距。
