KR101748798B1 - Non-destructive strength measurement method of concrete to utilize sound signal energy - Google Patents

Non-destructive strength measurement method of concrete to utilize sound signal energy Download PDF

Info

Publication number
KR101748798B1
KR101748798B1 KR1020150164533A KR20150164533A KR101748798B1 KR 101748798 B1 KR101748798 B1 KR 101748798B1 KR 1020150164533 A KR1020150164533 A KR 1020150164533A KR 20150164533 A KR20150164533 A KR 20150164533A KR 101748798 B1 KR101748798 B1 KR 101748798B1
Authority
KR
South Korea
Prior art keywords
sound signal
concrete
strength
striking
measuring
Prior art date
Application number
KR1020150164533A
Other languages
Korean (ko)
Other versions
KR20170060634A (en
Inventor
손무락
김무준
Original Assignee
대구대학교 산학협력단
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 대구대학교 산학협력단 filed Critical 대구대학교 산학협력단
Priority to KR1020150164533A priority Critical patent/KR101748798B1/en
Publication of KR20170060634A publication Critical patent/KR20170060634A/en
Application granted granted Critical
Publication of KR101748798B1 publication Critical patent/KR101748798B1/en

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/22—Details, e.g. general constructional or apparatus details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/4409—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison
    • G01N29/4427—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison with stored values, e.g. threshold values
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/023—Solids
    • G01N2291/0232—Glass, ceramics, concrete or stone

Landscapes

  • Physics & Mathematics (AREA)
  • Biochemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Pathology (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The present invention relates to a non-destructive strength measuring method of concrete using sound signal energy. In order to measure the strength of concrete, a sound signal generated when a concrete is hit is measured and a nondestructive strength of concrete is measured , It is possible to reduce various problems such as hindrance and inconvenience such as preparation of specimen and destructive test process of direct strength measurement method, time delay, and damage of structure due to sampling on site, It is possible to reduce the problem of difficulty in estimating the strength of concrete and difficulty in accurate estimation of strength, and to increase the reliability of concrete strength and field application at the same time, thereby improving the economics of design, construction and maintenance of civil infrastructure structures And that can increase safety It is a useful invention with particular advantages.

Description

[0001] The present invention relates to a non-destructive strength measurement method for concrete,

The present invention relates to a method of measuring the strength of concrete using sound signal energy, and more particularly, to a method of measuring the strength of concrete by using sound signal energy generated by sounding a concrete This method is intended to measure the strength, and it is easier to measure and shortens the measuring time compared with the existing method of strength measurement by direct destruction, and the accuracy of the strength measurement is increased by comparing with the existing nondestructive strength measurement method (Schmidt hammer, etc.) The present invention relates to a method for measuring the nondestructive strength of concrete using sound signal energy.

Recently Domestic and Foreign Due to the frequent occurrence of various accidents, social interest in safety has been increasing, and various efforts such as government and local governments have been put in place to prevent safety accidents. Especially, the safety problems of civil infrastructure and social infrastructure of buildings are directly related to citizens' life and property, and they are classified as the top priority for safety.

Therefore, for the safe design, construction and maintenance of the structures and facilities, the related parties should measure and evaluate the strength of the new and existing concrete to induce the safe construction and construction of the new structure. And to provide a basis for judging the timing, extent, and scope of the reinforcement.

There are two methods of measuring the strength of concrete, which are used in domestic and international structures and facilities. These methods include direct strength measurement and indirect strength measurement. The direct strength measurement method is to measure the strength by directly destroying the object to be measured through a compressive strength tester or the like. It is troublesome and inconvenient such as preparing and testing the specimen, and various problems such as damage of the structure due to sampling .

Non-Destructive Testing (NDT), a measure of temporal strength, is used to measure the strength of a material in a shorter period of time There are many advantages such as being able to do.

The most widely used non-destructive testing methods currently used in practice are surface hitting and ultrasonic methods, and products from Proceq, Switzerland and NDT James Instruments of the United States are almost exclusively used. The surface striking method is a rebound hardness method which is also called a Schmidt hammer method and is widely used as a method of estimating the strength without damaging a measurement object such as a structure.

The principle of the rebound hardness method is based on the correlation between the magnitude of the repulsive force reflected by the impact energy of the hammer and the strength of the object to be measured, and it is possible to measure the strength in a short time. However, There are many limitations in applying the proposed method and there is a disadvantage that the accuracy of the estimation of strength is low.

Ultrasonic method is a method of estimating the strength by using the correlation between the speed and intensity of sound wave propagation inside the object to be measured. The internal propagation speed of the ultrasonic wave is affected by the constitutional characteristics of the concrete, There is a problem that it is difficult to accurately estimate the strength.

On the other hand, as a conventional technique, "Non-destructive impact inspection system and inspection method" of Japanese Patent No. 0444269 is disclosed in Patent Document 1 (Patent Document 1).

However, the above-mentioned " non-destructive impact inspection system and inspection method "of Japanese Patent No. 0444269 aims at examining the integrity of an object by striking the surface of the object with a striking object (see Fig. 1) Since the force of the human being is used only for a single impact force, the magnitude of the hitting force can be varied each time. Therefore, the apparatus disclosed in the present application : 10-2015-0046338) It is different from the repetition blow by free fall and repulsion, and the subject and method are different from each other. The sound of the hit is normalized by wavelet packet transformation in relation to the impact force, And the soundness of the object is inspected through a complicated signal processing process. In comparison with the present invention, And a signal processing procedure, the earlier application by the present inventors (Patent Application No. 10-2015-0046338), a completely different technology, etc. to be blow method used in the present invention.

Patent Document 1: Patent No. 0444269

The present invention has been made to solve the various drawbacks and problems caused by the direct strength measurement method and the indirect strength measurement method of the concrete strength described above, and it is an object of the present invention to provide a concrete strength measuring method, , The sound signal energy generated when hitting the concrete is used. It is troublesome and inconvenient such as preparation of the specimen of the direct strength measurement method and destructive testing process, time delay, damage of the structure due to sampling of the specimen etc. And the strength of concrete is measured more easily, accurately, and quickly while reducing problems such as preparation of specimen and destruction test process, sampling of specimen, etc. Measurement of non-destructive strength of concrete using sound signal energy .

Another object of the present invention is to reduce the problem of difficulty in estimating the strength of concrete by the conventional indirect strength measurement method and the difficulty in estimating the exact strength of the concrete, and the accuracy of the concrete strength estimation is improved by using the sound signal energy And a method of measuring the nondestructive strength.

Another object of the present invention is to improve the reliability and the field applicability of the concrete strength to simultaneously improve the sound signal energy that can increase the economical and safety for the design, construction, and maintenance of the civil infrastructure and the civil infrastructure of the building structure And a method for measuring the nondestructive strength of concrete using the method.

In order to accomplish the above object, there is provided a method for measuring nondestructive strength of concrete using sound signal energy according to the present invention, using a concrete striking device (see FIG. 2), which was filed by the inventor of the present invention (Application No. 10-2015-0046338) And size of the concrete specimens, measuring the sound signal generated during the hitting, accumulating the total size of the measured sound signal to calculate the sound signal energy, and then performing the direct compression strength test for each impact specimen The concrete strength of the concrete is directly measured, and then the relation between the concrete sound signal energy and the direct compressive strength is set for a plurality of concrete specimens, and the strength of the concrete is measured by the non-destructive method using the set relational expression.

The present invention utilizes the sound signal energy generated when hitting the concrete to measure the strength of concrete, and it is difficult to find the inconvenience and inconvenience such as preparation of specimen and destructive test process of direct strength measurement method, time delay, It is possible to reduce various problems such as structural damage due to picking and the like. It is possible to reduce the difficulty of estimating the strength of the indirect strength measurement method and difficulty in estimating the exact strength, and it is possible to reduce the reliability of the concrete strength, And the economics and safety of the design, construction and maintenance of infrastructure for building structures.

1 is a perspective view of a non-destructive impact inspection system for a conventional soundness inspection,
2 is a photograph showing a configuration of a device for measuring a nondestructive strength of concrete using sound signal energy,
3 is a photograph showing an enlarged view of a hitting of a concrete specimen used in the present invention and measuring a blow sound signal,
4 is a flow chart showing the execution of the method of measuring the nondestructive strength of concrete using the sound signal energy of the present invention,
5 (a) and 5 (b) are photographs showing concrete specimens of various strengths and sizes used in the present invention,
6 is a graph showing a comparison of the relationship between the sound signal energy measured by the nondestructive strength measuring device of the concrete used in the present invention and the direct compression strength measured by breaking the concrete specimen,
7 is a graph showing a comparison between the concrete strength predicted using the relation between the sound signal energy and the direct compression strength obtained in FIG. 6 and the direct compression strength measured by directly destroying the specimen, by the size of the concrete specimen to be.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of a method of measuring nondestructive strength of concrete using sound signal energy according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a photograph showing the construction of a device for measuring the nondestructive strength of concrete using sound signal energy, which is used in the present invention. FIG. 3 is a view illustrating a method of hitting a concrete specimen used in the present invention, 5 (a) and 5 (b) are photographs showing concrete specimens of various strengths and sizes used in the present invention. Fig. 4 is a flow chart showing a method of measuring the nondestructive strength of concrete using the sound signal energy of the present invention. 6 is a graph showing a comparison of the relationship between the sound signal energy measured by the apparatus for measuring the nondestructive strength of concrete used in the present invention and the direct compression strength measured by breaking the concrete specimen according to the size of the concrete specimen, Is calculated by using the relational expression between the sound signal energy obtained in FIG. 6 and the direct compression strength The present invention relates to a method for measuring a nondestructive strength of a concrete used in a method of measuring the nondestructive strength of concrete using the sound signal energy of the present invention, Is composed of a striking part 100 for striking concrete and a sound signal measuring part 200 for measuring a sound generated during striking as a signal.

The striking unit 100 includes a striking height adjuster 101 installed up and down; A moving port 102 which is vertically movably inserted into the impact height adjuster 101; A hitting rod 104 having one end connected to the hinge connection portion 103 of the moving tool 102; And a striker 105 connected to the other end of the striking rod 104.

The striking rod 104 has a predetermined length (500 mm or less, in the present invention, 200 mm), one of the striking rods 104 is connected to the hinge connecting portion of the moving rod 102, Is formed of a striking port 105 (50 mm or less, 15 mm in the present invention) so that repeated blowing by repulsion after striking can be continuously performed by free fall of the material.

The sound signal measuring unit 200 is a device that can continuously measure the magnitude of sound generated after the concrete hitting as a signal over time. The microphone 201, the sound card 202, the sound signal analyzing means 203 The sound generated after the hitting is input to the sound signal analyzing means 203 through the microphone 201 and the sound card 202 to measure the size of the sound signal with the sound signal analyzing program.

As shown in FIG. 2, the striking part 100, which is used in the present invention, has a structure in which a free-falling striking rod 104 is configured to freely drop the striking rod 104 at a predetermined height on the surface of concrete, May be any one or more of which is configured so that repeated hitting by rebounding can occur consecutively until the striking energy disappears after hitting the concrete.

The sound signal measuring unit 200 according to the present invention can measure not only the signal measuring means as an example of the present invention but also any one or more . At this time, the measured sound signal may be any one or more of indices that can indicate the magnitude of sound such as sound pressure or decibel (dB).

The sound signal measuring unit 200 used in the present invention is configured to continuously measure the sound generated from the concrete blow as a signal over time. At this time, the measured sound signal may be any one or more of indices that can indicate the magnitude of sound such as sound pressure or decibel (dB).

The sound signal measured by the repetitive hitting by the initial hitting and repulsion shows a characteristic that its size is reduced with time as shown in FIG. 3, and the sound signal used in the present invention is an angle A value obtained by squaring a sound signal corresponding to a time and integrating the result with respect to the total time of signal generation (name of sound signal energy) is used as the total size of the sound signal. Of course, the sound signal corresponding to each time may be integrated as an absolute value with respect to the whole signal generation time without squaring it, and used as the entire size of the sound signal. At this time, the sound signal measured under the horizontal axis is taken as an absolute value and converted into a positive value before use. That is, all the areas surrounded by the sound signal curves on both the upper and lower sides of the horizontal axis, which is the axis of time, are obtained and used as the total size of the sound signal.

6 shows a comparison of the relationship between the sound signal energy measured by the nondestructive strength measuring device of the concrete used in the present invention and the direct compression strength measured by breaking the concrete specimen by the size of the concrete specimen. As shown in FIG. 6, the sound signal energies are different from each other according to the strength of the concrete, and the larger the intensity of the concrete is, the larger the total size of the measured sound signal energy is. It can also be seen that the relationship between the estimated sound signal energy and the measured intensity can be influenced by the size of the concrete specimen. From this, it can be known that the strength of concrete is directly related to the sound signal energy generated by the concrete impact, and it is also related to the size of the concrete specimen. It can be seen that the strength of the concrete can be measured using these results .

The present invention measures the strength of concrete by using the sound signal energy generated when the concrete is hit, and it is considered that the applicability and the expected effect in the industry are significant.

The method of measuring the nondestructive strength of concrete using the sound signal energy of the present invention includes preparing a test specimen (step S1) for preparing concrete specimens having different strengths and sizes; The impact test part is constructed with the hitting part 100 and the sound signal measuring part 200 to hit the concrete test specimen with the hitting part 100. After repeated hitting by repulsion after the hitting, A signal measuring step (S2) of measuring a sound signal to be sounded by the sound signal measuring unit 200 until the sound signal is measured; A sound signal energy calculation step (S3) of analyzing the measured impact sound signal by the sound signal analysis means 203 and calculating the sound signal energy; A direct compression strength measuring step (S4) of directly measuring the compressive strength of the concrete test specimen from which the sound signal energy is obtained; A relational expression derivation step S5 for repeating the steps S2 through S4 for the different concrete test specimens and determining the relationship between the calculated sound signal energy data and the measured direct compression strength data for each specimen generated therefrom and deriving a relational expression step); And a non-destructive compressive strength measuring step (S6) for measuring the non-destructive compressive strength of the concrete using the derived relational expression. The relationship between the sound signal energy data and the measured direct compression strength data is related to the size of the concrete specimen and may be related by the striking device and the signal measuring device used.

Example

The sound signal energy of each test specimen is calculated by the method of measuring the nondestructive strength of concrete using the sound signal energy of the present invention, and the compressive strength test is carried out directly to determine the compressive strength and then a relational expression between the sound signal energy and the direct compressive strength is derived The non - destructive compressive strength of concrete was measured by using the relational equation and the results were analyzed.

First, test specimens of different strength and size were prepared and prepared in the test specimen preparation stage (S1 step). That is, as shown in FIG. 5, a test specimen composed of concrete specimens having various strengths and sizes was prepared. The specimen specimen had three sizes (diameter 50 mm, height 100 mm; diameter 75 mm, height 150 mm; diameter 100 mm, height 200 mm) .

Next, in a signal measuring step (S2), a nondestructive strength measuring device composed of a hitting unit 100 and a sound signal measuring unit 200 is prepared as shown in FIGS. 2 and 3, The impact rod 104 of the impact part 100 used in the present invention is made of an aluminum material having a diameter of 2 mm and a length of 200 mm and the ball impact hole 105 provided at one end of the impact rod 104 is made of chrome steel . The striking rod 104 is connected to the hinge connection portion 103 of the moving port 102 and the striking height of the striking rod 104 is adjusted so that the striking height of the striking rod 105 The sound signal generated when hitting the concrete was measured. 3) and connected to the external sound card 202 as a jack, and the external sound card 202 is connected to the sound signal analysis means 203, As well as through a jack. At this time, the sound analysis program used by the sound signal analyzing means 203 is calibrated using a sound calibrator and used. The sound signal measurement was performed by setting the hitting rod at 89 degrees and loosening it so that the hitting rod was rotated by 89 degrees by free fall and the hitting energy was lost after the repeated hitting by the repulsion after the hitting, Until then, the sound signal was measured. The above impact test and signal measurement were performed on each specimen. Next, the batting sound signal measured in the sound signal energy calculating step (S3 step) is analyzed by the sound signal analyzing means 203 and the sound signal energy is calculated. Then, the direct compression strength was measured for all the concrete test specimens in which the sound signal energy was obtained in the direct compressive strength measuring step (S4 step), and then the sound signal energy calculated for each specimen in the relation deriving step (S5 step) The relationship between the data and the measured direct compressive strength data was grasped and a relational formula was derived for each specimen (see FIG. 6). Next, the non-destructive compressive strength of the concrete was predicted using the relational expression derived from the non-destructive compressive strength measurement step (S6), and the compressive strength test was directly performed to compare the measured results (see FIG. 7). As shown in FIG. 7, the compressive strength of the concrete predicted by using the sound signal energy and the compressive strength of the concrete obtained by performing the direct compressive strength test are very close to each other. From this, it can be seen that the strength of the concrete is directly related to the sound signal energy, which is the overall size of the sound signal generated by the impact, and thus the strength of the concrete can be measured.

While the present invention has been described with reference to the preferred embodiments, it is to be understood that the invention is not limited thereto and that various changes and modifications may be made therein without departing from the scope of the invention.

100: striking part 101: striking height adjuster
102: moving part 103: hinge connection part
104: striking rod 105: striking mouth
200: sound signal measuring unit 201: microphone
202: sound card 203: sound signal analyzing means

Claims (12)

A test specimen preparing step (S1 step) of preparing concrete specimens having different strengths and sizes; The impact test part is constructed with the hitting part 100 and the sound signal measuring part 200 and the concrete test specimen is hit by the hitting part 100. After repeated hitting by repulsion after the hitting, A signal measuring step (S2) of measuring a sound signal to be sounded by the sound signal measuring unit 200 until the sound signal is measured; A sound signal energy calculation step (S3) of analyzing the measured impact sound signal by the sound signal analysis means 203 and calculating the sound signal energy; A direct compression strength measuring step (S4) of directly measuring the compressive strength of the concrete test specimen from which the sound signal energy is obtained; A relational expression derivation step S5 for repeating the steps S2 through S4 for the different concrete test specimens and determining the relationship between the calculated sound signal energy data and the measured direct compression strength data for each specimen generated therefrom and deriving a relational expression step); And measuring the non-destructive compressive strength of the concrete using the derived relational expression (S6). 2. The method of claim 1, wherein the striking part (100) is configured such that the striking rod (104) falls freely at a predetermined height on the surface of the concrete, and the free striking rod (104) has no striking energy after the initial striking of the concrete Wherein the repetitive blowing is repeatedly performed by the repulsive force until the sound signal energy reaches a predetermined value. The hitting unit (100) according to claim 2, wherein the hitting unit (100) comprises: a hitting height adjuster (101); A moving part 102; A striking rod 104; And a striking hole (105). The method for measuring the nondestructive strength of concrete using sound signal energy. [5] The method of claim 3, wherein the impact rod (104) is connected to the moving part (102) as a hinge and the other part is formed as a ball-shaped impact hole (105) Wherein the non-destructive strength of the concrete is measured by using the sound signal energy. 5. The method of claim 4, wherein the striking rod (104) has a predetermined length (500 mm or less) and the diameter of the striking hole (105) is 50 mm or less. 4. The method according to claim 3, wherein the height of the impact rod (101) and the moving part (102) are adjusted to adjust the height of the impact rod (104). The sound signal measuring unit (200) according to claim 1, wherein the sound signal measuring unit (200) continuously measures the sound generated from repeated hitting by initial striking and repulsion of the concrete caused by free fall of the striking rod (104) Wherein the sound signal energies of the sound signal energies are different from each other. 8. The method of claim 7, wherein the sound signal of the sound signal measurement unit (200) is any one of a sound pressure and an indicator capable of indicating a magnitude of sound in decibels (dB). How to measure. The sound signal measuring unit according to claim 8, wherein the sound signal measuring unit includes a microphone, a sound card, and a sound signal analyzing unit. Wherein the sound is input through the microphone (201) and the sound card (202) and is configured to measure the magnitude of the sound signal in the sound signal analysis means (203). The method of claim 9, wherein the magnitude of the sound signal is obtained by squaring the sound signal corresponding to each time generated from the repeated hitting by the initial striking and repulsion, and then using the integrated value as the sound signal energy Wherein the non-destructive strength of the concrete is measured using sound signal energy. The sound signal processing method according to claim 9, wherein the size of the sound signal is an absolute value of a sound signal corresponding to each time generated from repeated hitting by initial striking and repulsion and is used as an overall size of a sound signal A Method for Measuring Nondestructive Strength of Concrete Using Sound Signal Energy. The method of claim 1, wherein the relational expression between the sound signal energy data and the measured direct compression strength data is related to the size of the concrete specimen and can be adjusted by the striking device and the signal measuring device used. Lt; / RTI >
KR1020150164533A 2015-11-24 2015-11-24 Non-destructive strength measurement method of concrete to utilize sound signal energy KR101748798B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150164533A KR101748798B1 (en) 2015-11-24 2015-11-24 Non-destructive strength measurement method of concrete to utilize sound signal energy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150164533A KR101748798B1 (en) 2015-11-24 2015-11-24 Non-destructive strength measurement method of concrete to utilize sound signal energy

Publications (2)

Publication Number Publication Date
KR20170060634A KR20170060634A (en) 2017-06-02
KR101748798B1 true KR101748798B1 (en) 2017-06-20

Family

ID=59222285

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150164533A KR101748798B1 (en) 2015-11-24 2015-11-24 Non-destructive strength measurement method of concrete to utilize sound signal energy

Country Status (1)

Country Link
KR (1) KR101748798B1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102021039B1 (en) * 2018-02-08 2019-11-04 충남대학교산학협력단 An evaluation method of early concrete solidity using non-destructive testing
KR102190604B1 (en) * 2019-01-31 2020-12-14 충남대학교산학협력단 A curing method of concrete specimens and an evaluation method of early concrete solidity that is using thereof
KR102556219B1 (en) * 2021-12-31 2023-07-20 우석대학교 산학협력단 Method of Comparison of concrete compressive strength by parameters of apartment building finishing materials using ultrasonic wave velosity test
KR102579510B1 (en) * 2023-02-03 2023-09-18 주식회사 이솔구조건축사사무소 Estimation system of concrete strength by impact hammer test

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5165270A (en) 1990-12-31 1992-11-24 Sansalone Mary J Non-destructive materials testing apparatus and technique for use in the field
JP2001311724A (en) * 2000-04-28 2001-11-09 Sato Kogyo Co Ltd Concrete soundness determination method and device
JP2002267583A (en) * 2001-03-09 2002-09-18 Fuji Tekku Kk Compression strength estimation method for concrete and compression strength estimation method for concrete of structure
KR101433787B1 (en) 2013-04-18 2014-08-27 한국원자력연구원 Damage Assessment System of In-situ Rock Mass using Acoustic Emission Technique and Assessment Method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5165270A (en) 1990-12-31 1992-11-24 Sansalone Mary J Non-destructive materials testing apparatus and technique for use in the field
JP2001311724A (en) * 2000-04-28 2001-11-09 Sato Kogyo Co Ltd Concrete soundness determination method and device
JP2002267583A (en) * 2001-03-09 2002-09-18 Fuji Tekku Kk Compression strength estimation method for concrete and compression strength estimation method for concrete of structure
KR101433787B1 (en) 2013-04-18 2014-08-27 한국원자력연구원 Damage Assessment System of In-situ Rock Mass using Acoustic Emission Technique and Assessment Method thereof

Also Published As

Publication number Publication date
KR20170060634A (en) 2017-06-02

Similar Documents

Publication Publication Date Title
KR101686735B1 (en) Non-destruct ive strength measurement device and method of materials to utilize sound signal
KR101748798B1 (en) Non-destructive strength measurement method of concrete to utilize sound signal energy
US11187681B2 (en) Method for evaluating state of member
KR101121283B1 (en) Buried pipe examining method
CN110455917B (en) Concrete crack repair quality detection method
JP2007322401A (en) Method for evaluating soundness of anchor
JP3523806B2 (en) Defect inspection method in concrete structure
JP2006349628A (en) Quality evaluation device for concrete structure and quality evaluation method for concrete structure
Gehlot et al. Study of concrete quality assessment of structural elements using ultrasonic pulse velocity test
CN116401571A (en) Concrete filled steel tube abnormal shape void identification method based on knocking sound wave and MiniRoccket
KR20200106757A (en) Non-destructive strength field measurement device and method to utilize sound signal energy
JP6130778B2 (en) Method and apparatus for inspecting interface of composite structure
JP2014130135A (en) Composite structure interface inspection method and device
KR101920069B1 (en) Non-destructive strength field measurement device and method to utilize sound signal energy
JP5996569B2 (en) Soundness inspection device for concrete structure, hammer for soundness inspection and soundness inspection method
JP6061767B2 (en) Method and apparatus for exploring delamination inside concrete
KR102020260B1 (en) Non-destructive strength field measurement device and method to utilize impulse
Son et al. Development and validation of an NDT based on total sound signal energy
Son et al. Estimation of nondestructive compressive strength of concrete using impact force response signal
Nwidi Modeling of compressive strength of concrete using pulse velocity values from a non-destructive testing of concrete
JP2003014709A (en) Defect probing method for concrete due to strike based on attenuation of energy
Sbartaï et al. Non-destructive evaluation of concrete damages of containment walls in nuclear power plants
JP6709713B2 (en) Method for inspecting floating and peeling of concrete structure and method for repairing concrete structure
Diaferio Correlation Curves for Concrete Strength Assessment Through Non-Destructive Tests
Mohshin Structural integrity assessment by destructive testing and nondestructive testing

Legal Events

Date Code Title Description
E701 Decision to grant or registration of patent right
GRNT Written decision to grant