Wireless embedded sensor for monitoring internal relative humidity in concrete

Concrete Sensoring for Sustainable Infrastructures (CSSI), C/Albinyana 109 3ER. 08223 Terrassa, Spain

The moisture content within the concrete pore network significantly influences the mechanical, thermal, and durability. properties of concrete structures. This paper introduces a novel, fully embedded wireless temperature and relative humidity sensor connected to an automatic acquisition system for continuous concrete monitoring. Measurements from the new sensor are compared with a commercial borehole-based system at depths of 25 and 40 mm under different exposure conditions (oven drying and humid chamber). Results demonstrate consistent relative humidity measurements between the two systems, validating the embedded sensor as a practical and reliable alternative to the borehole method. Furthermore, the embedded sensor provides continuous real-time data, proving effective in detecting curing variations during temperature fluctuations. This technology enhances quality control during curing, supports shrinkage management, and ensures better surface finishing integrity in concrete structures.

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Tai Ikumi and Ignasi Cairó, CSSI, Terrassa, Spain Antonio Aguado Prof. Emer., UPC Barcelona, Spain Albert de la Fuente, Prof. Dr.- Civil Engineer. Civil and Environmental Engineering Department of UPC and CSSI, Barcelona, Spain

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