基于压电陶瓷的地聚合物砂浆强度发展监测研究

将压电陶瓷(PZT)智能骨料成对嵌入地聚合物砂浆试件内部,利用主动感应法监测不同龄期地聚合物砂浆压电应力波信号,将时域信号图分析和小波包能量分析相结合,探讨了压电信号能量变化与地聚合物砂浆强度变化的对应关系。时域信号图分析表明,随着地聚合物砂浆养护龄期的增加,压电陶瓷智能电压幅值逐步增加,反映了地聚合物砂浆抗压强度的变化过程。小波包能量分析表明,随龄期的增加,地聚合物砂浆抗压强度变化过程与压电信号幅值计算总能量具有一致性。基于地聚合物砂浆抗压强度试验结果与压电陶瓷应力波所计算的能量值,拟合出地聚合物砂浆强度与压电应力波信号计算总能量的相关函数关系。

Strength Development Monitoring of Geopolymer Mortar Based on Piezoelectric Ceramics

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.