使用壓電水泥與機電阻抗技術監測砂漿和混凝土強度

MONITORING OF THE STRENGTH OF MORTAR AND CONCRETE USING PIEZOELECTRIC CEMENT SENSORS VIA ELECTROMECHANICAL IMPEDANCE TECHNIQUE

10.6652/JoCICHE.201905_31(3).0004

潘煌鍟(Huang-Hsing Pan)；王永德(Yung-Te Wang)；蘇育民(Yu-Min Su)

混凝土 ； 壓電水泥感測器 ； 機電阻抗 ； 結構健康監測 ； concrete ； cement sensor ； EMI ； structural health monitoring

中國土木水利工程學刊

31卷3期（2019 / 05 / 01）

253 - 262

繁體中文

為改善傳統壓電感測器在混凝土結構監測的界面傳導性和變形協調性問題，有別於PZT感測器和智能骨材，本研究以自製的壓電水泥（具壓電性之0－3型水泥壓電複合材料）配合機電阻抗技術來監測水泥砂漿和混凝土的強度成長，感測器是埋設於水泥砂漿和混凝土內部，試驗的比較組為PZT感測器。試驗結果顯示，壓電水泥能夠做為感測器來監測水泥砂漿和混凝土的強度，有效的觀測頻率約400～650 kHz，有效頻寬較PZT感測器大，且其電導的均方根差更能夠反映砂漿和混凝土的強度齡期行為；針對混凝土結構監測，使用50% PZT含量的壓電水泥有提高混凝土強度監測準確性的效果。

For improving the incompatibility of acoustic impedance and deformation between conventional piezoelectric sensors and concrete structures, piezoelectric cement (0-3 type cement-based piezoelectric composites) has been fabricated as a new piezoelectric sensor that applies to concrete structures, instead of PZT sensors and smart aggregates. Piezoelectric cement (PP sensors) embedded in mortar and concrete was conducted to monitor the strength development by measuring the change of electromechanical impedance (EMI). PZT sensors is the counterpart of the experiments. Results indicate that the piezoelectric cement is feasible to monitor the strength-age relation of concrete materials. The range of 400 ~ 650 kHz is effective to monitor the strength of concrete if the piezoelectric cement sensors were used. The span of frequency for PP sensors is greater than that for PZT sensors can benefit concrete structural health monitoring. The root-mean square deviation (RMSD) of conductivity by using PP sensors can reflect the strength development of concrete suitably. Piezoelectric cement containing 50 vol.% PZT is able to promote the accuracy for monitoring the strength of concrete materials, comparing with PZR sensors.

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