コンクリート工学年次大会2019(札幌)

講演情報

第41回コンクリート工学講演会

A.材料・施工 » フレッシュコンクリート

フレッシュコンクリートⅡ

2019年7月12日(金) 13:00 〜 15:15 第4会場 (108会議室)

座長:浦野真次(土木), 崎原康平(建築)

[1184] Monitoring for Setting Time of Mortar Using Electro-Mechanical Impedance of Piezoelectricity Sensor

Jinsung KIM, Hyeonggil CHOI, Juncheol LEE, Whajung KIM (Kyungpook National University)

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.