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Ultrasonic wave based concrete density assessment method

A concrete and ultrasonic technology, which is applied in the direction of using sound waves/ultrasonic waves/infrasonic waves to analyze solids and process detection response signals. It can solve the problems of concrete voids and non-dense areas that cannot be quantitatively detected, and achieve simple operation and broad promotion prospects. Ease of use

Active Publication Date: 2016-11-16
SHANDONG UNIV +1
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Problems solved by technology

[0008] In order to solve the above problems, the present invention proposes a method for evaluating the compactness of concrete based on ultrasonic waves. This method is based on ultrasonic waves, which can realize a method that is non-destructive to the structure and can quantitatively judge the compactness of concrete, and solves the existing problems of internal cavities and voids in concrete. Unable to quantitatively detect the non-dense area

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  • Ultrasonic wave based concrete density assessment method
  • Ultrasonic wave based concrete density assessment method
  • Ultrasonic wave based concrete density assessment method

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Embodiment Construction

[0053] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0054] Step 1, such as figure 1 , 2, 4, the present invention is based on the concrete compactness evaluation method of ultrasonic wave, at first according to the specific size of the test block 1, select the test area 8, determine the measuring point 9 at equal intervals, select the opposite two sides, and one side is used as the transmitting end 3, One side acts as the receiving end 4.

[0055] Step 2, apply coupling agent on the test area 8. Such as petroleum jelly or butter. The selection principles of the couplant mainly include the following six aspects: 1) The acoustic impedance of the couplant should be as close as possible to the acoustic impedance of the workpiece to improve the sound permeability; 2) Good wettability, easy to spread on the surface of the workpiece and combine with the surface of the workpiece , in order to eliminate the i...

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Abstract

The invention discloses an ultrasonic wave based concrete density assessment method. When first wave sound at a detection point set for ultrasonic detection is utilized, a distribution diagram of the sound velocity inside concrete is then determined, suspected voids or non-dense zones in the distribution diagram are marked, an ultrasonic CT forward simulation model is established, an ultrasonic propagation path is obtained based on a shortest-path ray tracing method, inversion is performed for quantitative assessment of the sizes of the voids or the non-dense zones inside the concrete. Compared with a traditional ultrasonic CT method, the testing accuracy of the method is higher, a two-dimensional image is introduced, the internal defects of the concrete is reflected clearly, and the ultrasonic wave based concrete density assessment method has wide popularization prospect.

Description

technical field [0001] The invention relates to a method for evaluating the compactness of concrete based on ultrasonic waves. Background technique [0002] Ultrasonic testing technology is an important means of testing the quality of concrete. Due to the needs of a large number of construction projects, it has developed very rapidly. With the continuous improvement and improvement of ultrasonic testing instruments, the instrument itself has become more compact and portable, and adopts integrated and intelligent modules to realize "one machine with multiple functions", which can collect multiple parameters such as sound velocity, amplitude and frequency, and gradually apply them to quantitative It is presumed that the concrete quality is being tested. [0003] However, at present, there are few literatures on the ultrasonic detection of undense areas and voids in concrete, especially the technology for quantitative detection of internal voids and undense areas has not yet b...

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Application Information

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IPC IPC(8): G01N29/07G01N29/44
CPCG01N29/07G01N29/44
Inventor 王宇军张峰姚晨董旭高磊张万志刘冠之韩福州
Owner SHANDONG UNIV
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