3D打印混凝土界面性能的超声波表征与分析OA

In order to investigate the impact of interface bonding performance on the non-destructive testing of 3D printed concrete(3DPC),concrete specimens with different layer counts and time intervals were printed and subjected to non-destructive testing using ultrasonic equipment.Additionally,splitting tests were conducted to determine the interfacial bond strength of 3DPC.It is shown that 3DPC exhibits slower wave propagation speeds and smaller amplitudes compared to cast concrete.Moreover,with the increase in the number of printed layers and time intervals,the amplitude attenuation also increases.Amplitude attenuation can be attributed to three parts:the loss caused by ultrasonic wave transmission between the transducer and the specimen,the along-path loss of concrete height,and the loss caused by the printed interface layer.The ultrasonic wave amplitude of 3DPC is significantly lower compared to cast concrete,as the number of printed layers increases,the interface bond strength of 3DPC initially increases and then decreases,showing a linear relationship with the amplitude loss.