Development of Technology for Measuring Water Retention and Permeability of Concrete Using Quartz Complex Capacitance Sensor

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 watertightness 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.