Which is a good multifunctional non-destructive testing instrument for concrete

Multi functional non-destructive testing instrument for concreteThis instrument can perform various tests on structures ranging from 10cm concrete specimens to 100m long bridges, dams, etc., including concrete material (elastic modulus, strength), structural dimensions, defects (internal voids, peeling, surface degradation), crack location, depth, etc. At the same time, it has graphic processing capabilities (such as elastic wave radar scanning EWR, computer tomography CT, planar imaging QPG) and automatic processing capabilities.

The main components of this instrument are imported, based on the theory of shock elastic waves, with high testing accuracy.

Multi functional non-destructive testing instrument for concreteTest principle:

Crack depth
1. Phase reversal method
By utilizing the relationship between diffraction angle and crack depth, the crack depth can be easily calculated
Due to the influence of contact between crack surfaces, steel bars, and moisture, it is suitable for testing shallow cracks (<20cm)

(1) Elastic technology

Shock wave technology and ultrasonic technology can also be used as effective non-destructive testing methods for concrete structures.

(2) Technical advantages

·Compared with non-metallic ultrasonic waves in concrete

The attenuation of elastic waves is relatively small when propagating in the test object, and the excitation ability can be adjusted and the excitation frequency can be adjusted. It has a wide range of applications and a large testing range;

CT scanning can be performed on large volume concrete structures to detect defects.

·Can test the quality of pipeline grouting compactness

Using the method of "surface wave method", the crack depth tested has high accuracy, is less affected by steel bars and moisture, and the depth range can reach 2 meters;

Less affected by steel reinforcement and modifiable.

High testing accuracy (using multiple spectrum analysis methods and intelligent mechanisms to automatically search for optimal results).

The testing range is wide (it can not only test concrete panels, but also test foundation burial depths up to several meters, retaining wall thickness, etc.).

Testing can be conducted on the compactness and quality of pipeline grouting.

Defects can be displayed as results through radar scanning.

·Enhance functionality

It can quickly and comprehensively test and evaluate the uniformity and loss of the surface of concrete structures.

Utilize the vibration, frequency response, duration, and other surface defects and materials of concrete to conduct testing.

(1) Non destructive testing items and methods for testing concrete structures

(2) Non destructive testing techniques and methods for high-performance prestressed structures

(3) Mechanical property testing of concrete structures

(4) Comparison of Testing Methods for Mechanical Properties of Concrete Structures

·Through the law

Measurement is carried out through two sensors: one sensor is used to record vibration, and the other sensor is used to receive signals. Therefore, by measuring the distance between two sensors and combining it with the propagation time between the two sensors, the propagation speed of elastic waves (mainly P-waves) in the test object can be calculated, and the internal strength of the test object can be converted based on the P-wave strength curve.

Testing the strength of concrete through testing

Testing concrete strength through oblique measurement method

Test waveform diagram

Repetitive reflex method

The repeated reflection method uses a sensor for measurement, and its testing principle is that for test objects with a relatively small structural thickness, the signal will reflect at the boundary between different media of the test object, causing the sensor to receive multiple reflected signals. By using spectral analysis algorithms (FFT, MEM) to analyze the reflection frequency of the test signal at the interface of the structure, and combining it with the wall thickness of the test object, the propagation speed of the elastic wave in the P-wave inside the test object can be calculated, and then the internal strength of the test object can be converted.

Repeated reflection method for testing concrete strength

Test waveform diagram

spectrum analysis

·Rayleigh wave method

Rayleigh waves, also known as surface waves, are tested on one side using the surface wave method. Calculate the R-wave velocity by testing the time difference between the excitation signal reaching two sensors.

Rayleigh wave (R-wave) method for testing concrete strength

Test points:

1) Due to the characteristics of Rayleigh waves, it is required that the distance between the excitation point and the triggering sensor be greater than twice the excitation wavelength, in order to fully generate Rayleigh waves,

2) The effective depth for testing the strength of concrete using Rayleigh waves is generally 0.5 times the excitation wavelength,

3) The excitation wavelength cannot be greater than the wall thickness of the test object (if the wavelength is greater than the wall thickness, it will reduce the phase wave velocity)

Test result chart

List of Test Results

(5) Defect testing of concrete structures

Table 1 Configuration List

Table 2 Main Technical Indicators