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Application of Nondestructive Testing Technology in Hydraulic Engineering Principle of rebound detection technology
The main tools in the rebound detection technology are the spring and the weight. The elastic deformation of the spring provides the elastic potential to push the hammer to work. The weight drives the force bar to strike the concrete surface of the building, and then the spring is measured. The displacement in this measurement process is finally calculated by calculating the specific value, and the obtained value is compared with the relevant index, and finally the strength of the concrete is judged. The advantage of this method is that the ideal measurement result can be obtained, that is, the measurement technology can accurately respond to the quality and uniformity of the concrete, and at the same time ensure the integrity and original performance of the tested wall.

Application of rebound detection technology
1. It is necessary to ensure that the surface of the concrete to be tested is smooth and clean, so as to prevent the existence of problems such as looseness and dirt;

2. The range of each measured structure should be controlled. If the surface size of the tested structure is too small, the number of measuring areas can be reduced appropriately. The distance between two adjacent measuring areas should be controlled at 2m;

3. When detecting, the axis of the rebounder is perpendicular to the concrete detection surface, and the pressure is applied slowly and uniformly to avoid damage caused by excessive force or sudden impact;

4. Evenly arrange the test points in the survey area, and the distance of the exposed steel bars at the measuring points is kept above 30mm. It is worth noting that the measuring points cannot be placed on the air holes or exposed rocks;

5. After the rebound value measurement is completed, select the best position to measure the carbonization depth value and take the average value;

6. When calculating the rebound value, remove the 3 maximum values ​​and 3 minimum values ​​from all the rebound values ​​in the measured area, and take the average value of the remaining rebound values.