It's always difficult to measure the thickness of the large volume concrete in the bridge test. At present, there are some methods to test the thickness of the concrete, such as digging a pit, drilling a hole and sampling, testing the echo of the shock wave, detecting the terra radar and reflecting the ultrasonic. The first and the second methods belong to the damaged test, and the others are undamaged test. These methods are mainly used to test the thickness of the road concrete, but can't be us...
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