Which is a good quality testing instrument for pore grouting compactness

1、 Product Function Overview:

Quality inspection instrument for pore grouting compactnessMainly used for testing the compactness of grout in prestressed ducts. Can quickly and qualitatively detect the compactness of pore channels; It is also possible to locate, detect and distinguish the type of grouting defects, regardless of the material of the corrugated pipe.

1. Test items

Test object: prestressed duct;

Test content: compactness of pore grouting.

2. Product Features

It has the function of testing the compactness of duct grouting in prestressed concrete beams. It has the function of rapid qualitative detection and locating grouting defects, and can also detect other internal defects such as honeycomb clusters.

3. Scope of testing

Testing range for grouting compactness: Qualitative testing up to 160M, positioning testing not limited by pore length, applicable to any pore length.

IIQuality inspection instrument for pore grouting compactnessInstrument parameters:

1. Platform: Integrated Embedded Platform

2. Operating System: Windows

3. Transmission method: wireless/wired transmission

4. Noise processing: smoothing, filtering and other functions

5. Spectrum analysis: FFT (EFS)/MEM

6. Testing content of pipeline grouting compactness: The instrument meets the requirements of rapid qualitative testing of grouting quality for post tensioned prestressed pipelines, accurate positioning testing, and identification of grouting defect types

7. Testing methods for grouting compactness: rapid qualitative analysis, full-length method (FLM), frequency characteristic method (FCM); Accurate positioning: Impact echo method (IE); Horizontal (vertical) prestressed ducts, signal characteristic method (SCM), longitudinal reflection method (LIEM)

8. * Number of Acceptable Channels: 2 channels, with interchangeable functions that can serve as both trigger and receive channels

9. Working temperature: -30~50 ℃

10. Sampling accuracy: Physical 24 bit

11. * High acquisition frequency: 4MHz per independent channel, and adjustable

12. * Small sampling interval: 0.25us, adjustable

13. Test letter: Vibration letter

14. Statistical processing: Average and bias processing

15. Information processing: Integral processing, spectrum analysis, correlation analysis

16. Scope of pipeline grouting compactness test: Qualitative test up to 160 meters, positioning test not limited by the length of the duct, applicable to any duct length

17. Input mode: Dual channel supports both ICP and DC, and can be used simultaneously in both channels.

3、 Instrument features

Good repeatability and less susceptibility to human factors;

Easy to operate: high level of intelligence, simple operation, and high efficiency;

ü Can quickly conduct qualitative testing, accurately locate and determine the type of grouting defects;

The main components are imported from countries such as Europe and America, with high reliability, precision, and durability.

4 Test Principle

In order to accurately test the grouting defects of longitudinal prestressed beam pipelines (with exposed anchor heads at both ends) while considering testing efficiency, we adopted various methods based on shock elastic waves for testing. Please refer to the table below for details.

List of testing items for grouting compactness

1. Qualitative testing

The use of steel strands exposed at both ends of the anchor cable for testing results in high testing efficiency. Due to the fact that defects such as voids usually occur above the ducts, it is usually only necessary to test the steel strands above. During a single testing process, the above-mentioned methods can be tested simultaneously, and the testing time for completing one channel can be within 1 minute.

2. Positioning test

Continuously test (exciting and receiving) along the pipeline position in scanning form, and test the condition of the grout inside the pipeline through the characteristics of the reflected signal.

3. Principles and Methods of Qualitative Testing

1) Overall grouting performance

Use frequency method and wave velocity method for testing.

（1）Frequency method

If the anchorage end of the prestressed duct is not compacted, high-frequency oscillation will occur. Therefore, the grouting situation at the end can be determined by changing the signal frequency.

(2) Wave velocity method

By testing the propagation time of elastic waves passing through the anchor cable and calculating the wave velocity of elastic waves passing through the anchor cable based on the distance of the anchor cable. Judging the compactness of prestressed pipeline grouting by changes in wave velocity. In general, there is a correlation between wave velocity and grouting density. As the grouting density increases, the wave velocity gradually decreases. When the grouting density reaches * *, the P-wave velocity of the tested anchor cable approaches that of the P-wave velocity in concrete.

4. Principles and Methods of Positioning Testing

1) Basic principles of positioning testing

Determine the presence and type of grouting defects based on the characteristic changes of vibration signals during propagation.

5、 Product configuration