Concrete strength detection method based on ultrasonic surface wave frequency dispersion curve

A technology of concrete strength and detection method, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, material analysis using sonic/ultrasonic/infrasonic waves, and measuring devices, etc. Concrete strength, etc.

Pending Publication Date: 2020-12-01
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The rebound method is the most commonly used method, which is relatively simple, but when using the rebound method to measure the surface strength of concrete, it will be affected by the increase in the composition of concrete admixtures, the use of admixtures, the gradual decrease in the particle size of coarse aggregate, and the continuous increase in the proportion of mortar, etc. Factor constraints
If only the rebound method is used for testing, it is impossible to accurately measure the strength of solid concrete.
Ultrasonic rebound comprehensive method to test the compressive strength of concrete is a method of comprehensively testing the compressive strength of concrete by

Method used

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  • Concrete strength detection method based on ultrasonic surface wave frequency dispersion curve
  • Concrete strength detection method based on ultrasonic surface wave frequency dispersion curve
  • Concrete strength detection method based on ultrasonic surface wave frequency dispersion curve

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Experimental program
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Embodiment 1

[0046] First introduce the principle of the present invention below.

[0047] Surface wave exploration is a geophysical exploration method that has emerged in recent years. Especially in engineering geophysical prospecting, the shear wave velocity of the shallow surface and subsurface medium can be accurately obtained by inverting the dispersion curve of the surface wave, so as to obtain its mechanical parameters. The surface wave has no dispersion characteristics in the uniform half space, but it will appear dispersion phenomenon in the non-uniform half space medium, even if its frequency changes, the speed of motion will also change, and it will cause the pulse wave to change due to the change of distance. changes happened. Generally speaking, fluctuations are rarely single-frequency waves, and may be the superposition of many single-frequency waves. The phase velocity is the velocity of one of the frequency waves, and the propagation velocity after the sum of the maximum a...

Embodiment 2

[0093] in such as figure 1 On the exemplary concrete member body shown, the RSM-SY6 foundation pile acoustic wave detector is used to detect the ultrasonic wave inside the reinforced concrete. The dispersion curve is extracted according to the ultrasonic seismic records obtained by the detection, and then the overall strength of the cement concrete is estimated through the phase velocity of the surface wave.

[0094] First, connect the two probes first, then turn on the power to set the parameters, the number of sampling points is 1024, and the sampling time interval is 1 microsecond. Measured 5 times on the side of the concrete respectively, the offset distance is 5 cm, the track spacing is 5 cm, and there are 26 tracks on the side. First, the two probes are covered with Vaseline, so that the probe and the concrete wall can be well connected. Ground coupling, then fix the first probe at the position of the first point, as the transmitting signal probe, and then the second pr...

Embodiment 3

[0101] In summary, the present invention aims to provide a concrete strength detection method based on the ultrasonic surface wave dispersion curve. Such as Figure 6 As shown, in the third embodiment, the above method mainly includes the following steps:

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Abstract

The invention provides a concrete strength detection method based on an ultrasonic surface wave frequency dispersion curve, which comprises the following steps of carrying out ultrasonic detection ona concrete member to obtain an ultrasonic surface wave seismic record of the concrete member, performing data transformation processing on the ultrasonic surface wave seismic record to obtain a phasevelocity frequency dispersion curve of the ultrasonic surface wave seismic record, layering the concrete member according to the fluctuation condition of the phase velocity frequency dispersion curve,calculating the average surface wave phase velocity of each layer of the concrete member, and calculating the concrete strength of each layer of the concrete member according to the average surface wave phase velocity, and evaluating the overall strength of the concrete member according to the concrete strength of each layer of the concrete member.

Description

technical field [0001] The invention relates to concrete strength detection technology, in particular to a concrete strength detection method based on ultrasonic surface wave dispersion curve. Background technique [0002] In recent years, my country has vigorously carried out infrastructure construction, among which concrete components are important materials for construction. In order to ensure the quality of the project, non-destructive testing is very important in the strength testing of concrete members. At present, there are many non-destructive testing methods for concrete strength, such as rebound method, ultrasonic rebound comprehensive method, Rayleigh wave method and so on. The rebound method is the most commonly used method, which is relatively simple, but when using the rebound method to measure the surface strength of concrete, it will be affected by the increase in the composition of concrete admixtures, the use of admixtures, the gradual decrease in the part...

Claims

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Application Information

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IPC IPC(8): G01N29/07G01N29/44
CPCG01N29/043G01N29/07G01N29/44
Inventor 周创居兴国邹少峰刘小民高艳霞刘晗
Owner CHINA PETROLEUM & CHEM CORP
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