Figure 1 Marking test points
Figure 2 Scanning the test object
The length, width and height of the test block are 1000mm * 600mm * 600mm, the concrete pouring strength grade is C20, and it is poured in two layers. A geotextile covering 1/2 of the section was placed at the horizontal section of the concrete layered pouring site.
Figure 3 Bottom reflection signal
Figure 4 Geotextile blocking area
Through the derived effect map, we can find that the reflection in the base map is clear and obvious, and the depth coordinate of 600mm is consistent with the actual test block size.
In Figure 4, we can find that mira can effectively distinguish the acoustic impedance of the geotextile from the concrete layer. The reflection cross-section and reflection depth are clearly visible, and the width is exactly half the length of the test block.