In this research, we developed a complex capacitance sensor with a crystal oscillator circuit for measuring the water retention and permeability of concrete. Differences in water-tightness due to aggregate size, curing method, and admixture were successfully measured. This technology is expected to be applied to on-site watertightness evaluation of concrete, contributing to the diagnosis of durability and deterioration of concrete and extending its service life through appropriately timed maintenance.
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