基于压电陶瓷的分段粘结混凝土试验

Experiments for piecewise bonded concrete based on piezoelectric ceramics

为了研究基于压电陶瓷的智能骨料预埋在混凝土试件中的作用,对智能骨料施加激励电信号,使其在混凝土中产生应力波,利用压电陶瓷所产生应力波的传输特征,分析混凝土结构内部的损伤机理。通过对早期混凝土强度和裂缝损伤进行监测,验证了该监测方法在实际工程中的可行性。研究结果表明:压电陶瓷智能骨料能及时监测分段混凝土界面在受力过程中的力学性能,能较好地反映混凝土试件早期强度的变化过程。压电陶瓷智能传感器也能用于服役期混凝土的裂缝损伤监测。

In order to study the function of the intelligent aggregate based on piezoelectric ceramics embedded in concrete specimens, the intelligent aggregate is excited by electric signals to generate stress waves in concrete. The stress wave transmission characteristics of piezoelectric ceramics can be used to analyze the internal damage mechanism of concrete structure. Through monitoring the strength and crack damage of early concrete, the feasibility of this monitoring method in practical engineering is verified. The results show that the piezoelectric ceramic intelligent aggregate can timely monitor the mechanical properties of the segmented concrete interface under stress, which reflects the early strength change process of the concrete specimen. The piezoelectric ceramic intelligent sensor can also be used to monitor the crack damage of the concrete.