[1184] Monitoring for Setting Time of Mortar Using Electro-Mechanical Impedance of Piezoelectricity Sensor
キーワード：electro-mechanical impedance、mortar、piezoelectricity sensor、setting
In this study, the setting characteristics of cementitious materials were evaluated using the change in the electro-mechanical impedance (EMI) signal of piezoelectricity (PZT). The change in the EMI signal based on the age of the PZT sensor embedded in the mortar was compared with the penetration resistance test. Experimental results show that the setting time of the PZT sensor matches with the setting time obtained from the penetration resistance test. As the mortar was hydrated, the EMI resonance peak and the resonance frequency of the PZT sensor changed. It was found that the point at which the resonance frequency moved to a high-frequency band corresponded to a period in which the decrease in the resonance peak was gradual. This change point can be seen as the initial setting time. In addition, the point at which the resonance peak point disappears can be regarded as the final setting point.