Abstract: The piezoelectric ceramics (PZT) smart aggregates were embedded in the geopolymer mortar specimens in pairs, the active induction method was used to monitor the piezoelectric stress wave signals of the geopolymer mortar at different ages, and the time-domain signal diagram analysis was combined with the wavelet packet energy analysis. The corresponding relationship between the energy change of the piezoelectric signal and the strength change of the geopolymer mortar was discussed. The time-domain signal diagram analysis shows that with the increase of the curing age of the geopolymer mortar, the piezoelectric ceramic intelligent voltage amplitude gradually increases, reflecting the change process of the compressive strength of the geopolymer mortar. The wavelet packet energy analysis shows that with the increase of age, the compressive strength of the geopolymer mortar is consistent with the total energy calculated by piezoelectric signal amplitude. Based on the experimental results of the compressive strength of the geopolymer mortar and the energy calculated by stress wave of piezoelectric ceramics, the correlation function between the strength of the geopolymer mortar and the total energy calculated by piezoelectric stress wave signal is fitted.
Key words: piezoelectric ceramics smart aggregate, geopolymer mortar, active induction method, wavelet packet energy analysis, time-domain signal diagram, function
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