earticle

영어

Evolution of electro-mechanical impedance (EMI) of piezoelectric (PZT) sensor embedded in cement paste was investigated to predict the setting time of cement paste. EMI signatures of the PZT sensor were continuously measured from casting up to 12 hours. Vicat needle test and semi-adiabatic test were conducted to compare and correlate the evolution of EMI with setting time. Results showed that EMI responses are sensitive to the ages of the cement paste and the behavior of the EMI resonance peak has a clear correlation with the setting times obtained from Vicat needle test. Based on the results, it is concluded that the EMI sensing technique using embedded PZT sensor can be effectively applied for setting time monitoring of cement paste.