CN116359014A - System and method for detecting strength of juvenile concrete - Google Patents
System and method for detecting strength of juvenile concrete Download PDFInfo
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- CN116359014A CN116359014A CN202310351840.1A CN202310351840A CN116359014A CN 116359014 A CN116359014 A CN 116359014A CN 202310351840 A CN202310351840 A CN 202310351840A CN 116359014 A CN116359014 A CN 116359014A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000000366 juvenile effect Effects 0.000 title claims abstract description 27
- 238000013016 damping Methods 0.000 claims abstract description 66
- 238000012360 testing method Methods 0.000 claims abstract description 47
- 238000001514 detection method Methods 0.000 claims abstract description 38
- 230000005284 excitation Effects 0.000 claims abstract description 26
- 230000008054 signal transmission Effects 0.000 claims abstract description 3
- 230000002787 reinforcement Effects 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000012669 compression test Methods 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000003321 amplification Effects 0.000 claims description 2
- 235000014121 butter Nutrition 0.000 claims description 2
- 238000007405 data analysis Methods 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 238000010998 test method Methods 0.000 claims description 2
- 229940034610 toothpaste Drugs 0.000 claims description 2
- 239000000606 toothpaste Substances 0.000 claims description 2
- 239000004264 Petrolatum Substances 0.000 claims 1
- 229940066842 petrolatum Drugs 0.000 claims 1
- 235000019271 petrolatum Nutrition 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 7
- 238000004904 shortening Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 230000001066 destructive effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003501 co-culture Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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- 239000002002 slurry Substances 0.000 description 1
- 229940099259 vaseline Drugs 0.000 description 1
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
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- G01N19/00—Investigating materials by mechanical methods
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- 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
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
- G01N33/383—Concrete or cement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N2001/2893—Preparing calibration standards
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The invention discloses a system and a method for detecting the strength of juvenile concrete, wherein the system comprises a poured concrete piece, a one-dimensional rod piece, an excitation head, a sensor, a detection host and an excitation controller; a one-dimensional rod piece is embedded in the pouring concrete piece, and the head end of the one-dimensional rod piece is exposed out of the upper surface of the pouring concrete piece; the one-dimensional rod piece is provided with an excitation head and a sensor for signal pickup; the excitation head is connected with the excitation controller through a power supply lead; the sensor is connected with the detection host through a signal transmission line; the detection method based on the system is mainly divided into two parts of calibration and test; the invention provides a set of equipment and a method for accurately and effectively testing the strength of the concrete in the young period by testing the damping ratio of the embedded one-dimensional rod piece and establishing the relation with the compressive strength of the concrete, and has practical significance for optimizing the construction of the concrete structure and shortening the construction period of the concrete structure.
Description
Technical Field
The invention belongs to the technical field of concrete construction materials, and particularly relates to a system and a method for detecting the strength of juvenile concrete.
Background
Concrete is one of the most important civil engineering materials in the current generation, and is widely applied to a plurality of civil engineering fields such as road traffic, modern buildings, municipal engineering and the like.
In order to improve the construction efficiency of concrete, when the concrete is initially set, a plurality of units begin to disassemble the mould and perform the construction of the next concrete warehouse, and the time for disassembling the mould is critical to the safety and efficiency of the concrete. And the detection of the intensity of the concrete in the young age is indispensable for grasping the die stripping time.
At present, more concrete strength detection technologies are available, but effective detection methods for the concrete strength of young ages are needed to be filled. In particular to the detection of the concrete in the young period, the method forms the technical means with higher technical level, faster working efficiency and more accurate detection precision. The labor cost is reduced, the working efficiency is improved, and the risk capacity of resisting the working period is enhanced. From the industrial field, a special detection technology for the strength of the young concrete with large-area application is not formed in China.
The most important properties of concrete are mechanical properties, which refer to the ability of concrete to resist compressive, tensile, bending, shearing and other stresses, and for this purpose, a "compressive strength" technical index is introduced, which is used until now once proposed, and concrete is classified according to standard compressive strength, which is called a reference numeral. In engineering detection, there are various methods for detecting compressive strength, such as directly measuring the compressive strength (destructive) of a sample by using a pressure tester in a construction laboratory, and obtaining the compressive strength by using a core drilling method, rebound detection method and other detection methods in the field. The domestic concrete strength detection method is mainly divided into destructive detection and nondestructive detection. Wherein the lossy detection includes ballasting and core sampling; nondestructive testing includes rebound method, ultrasonic-rebound method, and impact wave method;
when the detection method is used for detecting the strength of the concrete, the corresponding specifications prescribe that the detection application ranges of the method are all detection methods for the full-age concrete, and the method cannot detect the strength of the initially-set concrete.
Disclosure of Invention
In order to solve the technical problems, the invention provides a system and a method for detecting the strength of the juvenile concrete, which can accurately detect the gradual change of the strength of the juvenile concrete;
in order to achieve the technical purpose, the invention is realized by the following technical scheme:
a system for detecting the strength of juvenile concrete comprising: pouring a concrete piece, a one-dimensional rod piece, an excitation head, a sensor, a detection host machine and an excitation controller;
a one-dimensional rod piece is embedded in the pouring concrete piece, and the head end of the one-dimensional rod piece is exposed out of the upper surface of the pouring concrete piece;
the one-dimensional rod piece is provided with an excitation head and a sensor for signal pickup; the excitation head is connected with the excitation controller through a power supply lead; the sensor is connected with the detection host through a signal transmission line;
preferably, the detection host is internally provided with a signal acquisition module, a signal amplification module and a data analysis module;
preferably, the coupling material of the sensor is one of butter, toothpaste, vaseline and magnetic coupling;
preferably, the excitation force and the excitation direction of the excitation head are adjustable;
the invention further aims to provide a method for detecting the strength of the juvenile concrete, which mainly comprises two parts of calibration and test, wherein the specific method for calibrating is as follows:
s1.1: when the reinforcement of the concrete structure is bound, the one-dimensional rod piece is fixed on the structural reinforcement, or after pouring is completed, the reinforcement is inserted into the concrete;
s1.2: after concrete is poured, damping test is carried out on the rod body of the one-dimensional rod piece at fixed time intervals by using a detection host device, and the damping ratio of the one-dimensional rod piece is analyzed;
s1.3: the compression test is carried out on the strength of the test block with the same proportion while the damping ratio of the one-dimensional rod piece is tested, so that the compression strength of the concrete at the moment is obtained;
s1.4: repeating the steps S1.2 and S1.3 in the same time interval to finish the test and analysis of the damping ratio and the compressive strength of the one-dimensional rod piece at different moments;
s1.5: establishing the relation between the compressive strength of test blocks in different ages and damping ratio at corresponding moments; specific relation f c ＝A*ζ K +C; A. c, K is a constant, and ζ is the vibration damping ratio of the measured one-dimensional rod piece;
the specific method for testing comprises the following steps:
s2.1: testing the damping ratio of a one-dimensional rod piece in the poured concrete piece;
s2.2: detecting the strength of the juvenile concrete by using the established relation;
strength f of concrete for young period c ＝A*ζ K +C; A. c, K is a constant, and ζ is the vibration damping ratio of the measured one-dimensional rod piece;
preferably, the damping ratio test method is as follows:
1) Taking the maximum amplitude value of the test waveform as A 0 ；
2) The amplitude of the in-phase peak point after the value is A i I=1, 2..about 10 or so or to a can be taken i <0.05A 0 ；
3) Calculating the damping ratio ζ corresponding to each peak point through the method 1 i ；
4) Removing abnormal values of the damping ratios of peak points of all states, and taking the average value of the residual damping ratios as the damping ratio of the waveform;
5) When each state has multiple wave forms, the average value of the damping ratio of each wave form is taken as the damping ratio zeta of the concrete in the state A 。
The beneficial effects of the invention are as follows:
1) The damping ratio of the embedded one-dimensional rod piece can be tested, and the relation between the damping ratio and the compressive strength of the concrete is established, so that a set of equipment and a method for accurately and effectively testing the strength of the concrete in the young period are provided, and the method has practical significance for optimizing the construction of the concrete structure and shortening the construction period of the concrete structure.
2) The method solves the problem that the conventional detection method (rebound method, ultrasonic rebound method and coring method) can not effectively detect the strength of the juvenile concrete.
Drawings
FIG. 1 is a prior art primary concrete strength detection method;
FIG. 2 is a schematic diagram of a detection system;
FIG. 3 is a schematic diagram of a test waveform;
FIG. 4 is a calibration flow chart;
FIG. 5 is a flow chart of a juvenile concrete strength test;
FIG. 6 is a field illustration of a pre-buried one-dimensional rod in concrete;
FIG. 7 is a graph of juvenile concrete strength versus average damping ratio;
FIG. 8 is a schematic diagram of a compressive strength test.
In fig. 2, the structural names represented by the reference numerals are:
the concrete casting device comprises a 1-casting concrete piece, a 2-one-dimensional rod piece, a 3-power wire, a 4-signal transmission line, a 5-vibration exciting head, a 6-sensor, a 7-detection host and an 8-vibration exciting controller.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
In this embodiment, the vibration damping characteristic of the shock elastic wave is utilized to directly test the damping characteristic of the pre-buried one-dimensional rod after being vibrated, and the configuration and test of the test system are shown in fig. 2.
Before detection, the one-dimensional rod piece 2 needs to be pre-buried, and 1 excitation point and 1 signal pickup point are arranged on the end face of the rod piece, wherein the distance between the excitation point and the signal pickup point and the edge of the rod piece is not less than 2mm. Then the rod surface is treated to ensure that the surface is smooth and free of impurities such as slurry, a signal pickup device sensor 6 is coupled at the exposed end surface position of the embedded one-dimensional rod 2 according to requirements, a power wire 3 is used for connecting an excitation controller 8 and an excitation head 5, the excitation controller 8 is opened to excite the end surface of the one-dimensional rod 2, elastic waves are generated to propagate along the embedded steel bars into the one-dimensional rod 2, and in the transmission process of signals, the vibration damping of the one-dimensional rod 2 is increased due to the increase of the strength of concrete. And the strength of the juvenile concrete around the one-dimensional rod piece 2 is calculated by testing the damping change condition of the one-dimensional rod piece 2 after knocking.
The detection technology and the device adopt the attenuation characteristic of elastic waves, and the processing mode is as follows: damping identification method. And determining the damping of the test object through the processed signal processing analysis, and calculating the average value of the damping ratios of the multiple tests to be used as the damping ratio of the juvenile concrete in the state.
The damping ratio is calculated as follows: 1) Taking the maximum amplitude value of the test waveform as A 0 As in fig. 3; 2) The amplitude of the in-phase peak point after the value is A i I=1, 2..about 10 or so or to a can be taken i <0.05A 0 The method comprises the steps of carrying out a first treatment on the surface of the 3) Calculating the damping ratio ζ corresponding to each peak point through the method 1 i : 4) And removing abnormal values of the damping ratios of peak points of all states, and taking the average value of the residual damping ratios as the damping ratio of the waveform. 5) When each state has multiple wave forms, the average value of the damping ratio of each wave form is taken as the damping ratio zeta of the concrete in the state A 。
And detecting the strength of the juvenile concrete, and calibrating the damping ratio of the one-dimensional rod piece and the strength of the juvenile concrete standard test block if the relation between the damping ratio and the concrete strength is not established. And detecting the strength of the concrete in the young period after the detection is completed.
Calibrating:
1) After concrete is poured, damping test is carried out on the one-dimensional rod body 2 of the rod in the embedded concrete at fixed interval time by utilizing detection equipment, and the damping ratio zeta of one-dimensional rod signals is analyzed A 、ζ B 、ζ C …。
2) The compression test is carried out on the strength of the test block with the same proportion while the damping ratio of the one-dimensional rod piece is tested, so that the compression strength f of the concrete at the moment is obtained A The method comprises the steps of carrying out a first treatment on the surface of the Repeating the measurement at the same interval time (time interval not less than 10)Try damping f for each time period B 、f c ...。
3) And testing and analyzing the damping ratio and the compressive strength of the one-dimensional rod piece at different moments. Fitting the relation between the rod piece damping ratio and the test block compressive strength at different moments: strength f of concrete for young period c ＝A*ζ K +C; A. c, K is constant, ζ is vibration damping ratio of the one-dimensional rod.
According to research on domestic and foreign related research and product investigation, equipment and a method for detecting the strength of the juvenile concrete based on the vibration damping ratio are not found.
FIG. 4 is a schematic flow chart of the method for calibrating the strength of the juvenile concrete, which shows the main steps of calibrating the relation between the damping ratio and the strength of the concrete. Fig. 5 shows a schematic flow chart of the strength detection of the juvenile concrete according to the present invention, in which the main steps of the on-site detection of the strength of the juvenile concrete are described.
Example 2
The invention is adopted to detect the strength of the concrete of the young age of a certain concrete pavement. According to the provided data, the pavement thickness of the measured position is 20cm, the concrete design strength is C20, and before the concrete is poured, the finish rolling screw thread reinforcing steel bars with the diameter of 22mm, the length of 33cm and the exposed length of 2cm are pre-buried in the concrete. When concrete is poured, 9 groups (27) of concrete standard test blocks are manufactured, and the same-condition maintenance is adopted.
According to the research results and the actual conditions on site, the damping ratio of the embedded one-dimensional rod piece is tested and analyzed in a free state and 24 hours, 32 hours, 40 hours, 48 hours, 60 hours, 72 hours, 96 hours and 120 hours after concrete is poured, and the compression test is carried out on 1 group of test blocks at the same time when damping is tested, so that the compression strength value of the concrete at the moment is obtained.
Through testing and analysis, the damping ratio of the steel bar at different times and the compressive strength of the concrete test piece are respectively obtained, and the results are shown in Table 1.
Table 1 damping ratio and compressive Strength test results
| Sequence number | Average damping ratio | Testing age (hours) | Concrete strength (MPa) |
| 1 | 0.010 | 16 | 0.01 |
| 2 | 0.025 | 24 | 2.2 |
| 3 | 0.033 | 32 | 3.5 |
| 4 | 0.043 | 40 | 4.4 |
| 5 | 0.061 | 48 | 7.8 |
| 6 | 0.066 | 60 | 7.9 |
| 7 | 0.077 | 72 | 9.1 |
| 8 | 0.082 | 96 | 10.8 |
| 9 | 0.091 | 124 | 12.2 |
Fitting is performed on the test data, and the fitting result is shown in fig. 7. The relation between the compressive strength and the average damping ratio is obtained: f= 20739 ζ 2.8491 Correlation coefficient R 2 = 0.8589. And testing the rod piece to be tested by using the relation, wherein the measured damping ratio is 0.07. And according to a calibrated relational expression, the compressive strength of the juvenile concrete in the state is 10.5MPa. And the compressive strength of the model co-culture test block is detected, the detection scene is shown in fig. 8, the compressive test result value is 9.8MPa, and the difference between the compressive test result value and the test result of the method is only-0.7 MPa, so that the engineering application level is achieved.
Claims (6)
1. A system for detecting the strength of juvenile concrete comprising: pouring a concrete piece, a one-dimensional rod piece, an excitation head, a sensor, a detection host machine and an excitation controller;
a one-dimensional rod piece is embedded in the pouring concrete piece, and the head end of the one-dimensional rod piece is exposed out of the upper surface of the pouring concrete piece;
the one-dimensional rod piece is provided with an excitation head and a sensor for signal pickup; the excitation head is connected with the excitation controller through a power supply lead; the sensor is connected with the detection host through a signal transmission line.
2. The system for detecting the strength of the juvenile concrete according to claim 1, wherein the detection host is internally provided with a signal acquisition module, a signal amplification module and a data analysis module.
3. The system for detecting the strength of juvenile concrete according to claim 1, wherein the sensor's coupling material is one of butter, toothpaste, petrolatum, magnetic coupling.
4. The system for detecting the strength of the juvenile concrete according to claim 1, wherein the excitation force and the excitation direction of the excitation head are adjustable.
5. The method for detecting the strength of the juvenile concrete is characterized by mainly comprising a calibration part and a test part, wherein the specific method for calibrating is as follows:
s1.1: when the reinforcement of the concrete structure is bound, the one-dimensional rod piece is fixed on the structural reinforcement, or after pouring is completed, the reinforcement is inserted into the concrete;
s1.2: after concrete is poured, damping test is carried out on the rod body of the one-dimensional rod piece at fixed time intervals by using a detection host device, and the damping ratio of the one-dimensional rod piece is analyzed;
s1.3: the compression test is carried out on the strength of the test block with the same proportion while the damping ratio of the one-dimensional rod piece is tested, so that the compression strength of the concrete at the moment is obtained;
s1.4: repeating the steps S1.2 and S1.3 in the same time interval to finish the test and analysis of the damping ratio and the compressive strength of the one-dimensional rod piece at different moments;
s1.5: establishing the relation between the compressive strength of test blocks in different ages and damping ratio at corresponding moments; specific relation f c ＝A*ζ K +C; A. c, K is a constant, ζ is the vibration of the one-dimensional rodDamping ratio;
the specific method for testing comprises the following steps:
s2.1: testing the damping ratio of a one-dimensional rod piece in the poured concrete piece;
s2.2: detecting the strength of the juvenile concrete by using the established relation;
strength f of concrete for young period c ＝A*ζ K +C; A. c, K is a constant, and ζ is the vibration damping ratio of the measured one-dimensional rod.
6. The method for detecting the strength of young concrete according to claim 5, wherein the damping ratio test method is as follows:
1) Taking the maximum amplitude value of the test waveform as A 0 ；
2) The amplitude of the in-phase peak point after the value is A i I=1, 2..about 10 or so or to a can be taken i <0.05A 0 ；
3) Calculating the damping ratio ζ corresponding to each peak point through the method 1 i ；
4) Removing abnormal values of the damping ratios of peak points of all states, and taking the average value of the residual damping ratios as the damping ratio of the waveform;
5) When each state has multiple wave forms, the average value of the damping ratio of each wave form is taken as the damping ratio zeta of the concrete in the state A
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118382023A (en) * | 2024-06-24 | 2024-07-23 | 江西省交通工程集团有限公司 | Concrete maturity monitoring system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118382023A (en) * | 2024-06-24 | 2024-07-23 | 江西省交通工程集团有限公司 | Concrete maturity monitoring system and method |
| CN118382023B (en) * | 2024-06-24 | 2024-09-06 | 江西省交通工程集团有限公司 | Concrete maturity monitoring system and method |
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