CN103995036A - Method for monitoring cement-based material crack by using electrochemical impedance spectroscopy in real time - Google Patents
Method for monitoring cement-based material crack by using electrochemical impedance spectroscopy in real time Download PDFInfo
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- CN103995036A CN103995036A CN201410253911.5A CN201410253911A CN103995036A CN 103995036 A CN103995036 A CN 103995036A CN 201410253911 A CN201410253911 A CN 201410253911A CN 103995036 A CN103995036 A CN 103995036A
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Abstract
The invention belongs to the field of civil construction, and particularly relates to a method for monitoring a cement-based material crack by using an electrochemical impedance spectroscopy in real time. The method comprises the steps: firstly, pre-embedding electrode plates on two ends of a cement-based material test piece or placing the electrode plates during implementing, connecting the electrode plates with an electrochemical working station data acquisition system through a lead, then connecting the electrode plates with a computer data processing system; then applying different frequencies of sine alternating-current voltage (current) disturbance signals on the cement-based material test piece through the electrode plates, generating corresponding response signals by the input disturbance signals after passing through the test piece, namely sine alternating-current current (voltage) signals, and processing the response signals through the electrochemical working station data acquisition system and the computer data processing system to obtain an electrochemical impedance spectroscopy of the test piece; and finally, monitoring the cracking condition of the cement-based material test piece crack through analyzing a characteristic change of the electrochemical impedance spectroscopy. The method is high in measurement speed, strong in interference resistance, and simple to operate.
Description
Technical field
The present invention relates to a kind of detection method that is applied in the material crack in civil construction field, especially a kind of method of utilizing electrochemical impedance spectroscopy Real-Time Monitoring cement-based material crack.
Background technology
Cement-based material is to take cement as Binder Materials, the material obtaining with other combination of materials, it is the maximum and most widely used civil engineering material of consumption in the world, its advantage is: each component is easy to obtain, cheap, be easy to moulding, be easy to manufacture various shapes, there is good security and permanance simultaneously.But, existing cement-based material exist from great, tensile pressure ratio is little, fracture toughness is low, fragility is large and be easy to the shortcomings such as cracking, especially along with the raising of cement-based material intensity, the cracking of cement-based material and fragility problem become more and more outstanding, cause cement-based material easily wreck or lost efficacy.At present, the a series of technology such as supercritical ultrasonics technology, OTDR technology, image acquisition and processing method, radiation technique that proposed are observed cement-based material crack and monitor, but said method has certain limitation, such as complicated operation, test duration are long, randomness is large, affected greatly by subjective factor.Therefore, for ease of taking in time corresponding reclamation activities, carry out quality control effectively, minimizing is because engineering construction destroys economic loss and the casualties causing, also need cement-based material hydration mechanism, product structure, steel bar corrosion, impermeability, chlorion diffusion, gather materials and the aspect such as admixture is active, the prediction of structural behaviour damage and early warning is studied, proposition more meets the technical scheme of actual demands of engineering.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of method of utilizing electrochemical impedance spectral method Real-Time Monitoring cement-based material crack, adopting in the theoretical foundation of electrochemical impedance spectroscopy principle research cement-based material characteristic, analyze the cracking of cement-based material and the development and change situation in crack, thereby degree that can Real-Time Monitoring cement-based material crack and damage, for taking in time corresponding reclamation activities, carry out effective mass and control, and then it is significant to reduce the loss bringing due to engineering construction destruction.
The present invention is to utilizing the principle of electrochemical impedance spectroscopy Real-Time Monitoring cement-based material crack to make following description.
Electrochemical impedance spectroscopy is to electro-chemical systems, to apply a different little amplitude of frequency to exchange electromotive force ripple, measure and exchange the ratio of electromotive force and current signal with the variation of sine wave freuqency, ratio is the impedance of system, or the phasing degree of measuring system impedance is with the variation of sine wave freuqency.It is a kind of frequency field measuring method, and measurable frequency range is very wide, can obtain than the more dynamic information of conventional electrochemical method and electrode interface structural information.Owing to adopting sinusoidal electric potential signal by a small margin to carry out perturbation to system, on electrode, alternately there is oxidation and reduction process.Therefore, even if disturbing signal long duration of action in electrode, also can not cause the accumulation sexual development of polarization phenomena and the accumulation of electrode surface state to change.Owing to having linear relationship between electromotive force and electric current, in measuring process, electrode, in metastable state, simplifies the digital processing of measurement result.
The electro-chemical systems that the present invention is comprised of cement-based material test specimen, electrode slice, wire, electrochemical workstation and computing machine is realized continuously, automatically monitoring and writing task of Eis Characteristics supplemental characteristic, and according to the variation of Eis Characteristics parameter, judges a kind of method of test specimen cracking situation.Electro-chemical systems can be regarded an equivalent electrical circuit as, and this equivalent electrical circuit is combined according to different modes such as series and parallels by primary elements such as resistance, electric capacity and inductance.By electrochemical impedance spectroscopy, can measure the formation of equivalent electrical circuit and the size of each element, utilize the galvanochemistry implication of these elements to analyze the structure of electro-chemical systems and the character of electrode process.Cement-based material test specimen is a kind of special electro-chemical systems, electrodes in the pre-coverage of survey area of test specimen, when there is crack in cement-based material test specimen, be equivalent to increase electric capacity in test specimen, cause the impedance of test specimen under different frequency to change, by the analysis of electrochemical workstation, obtain the electrochemical parameter value of test specimen under different frequency, by computer drawing, obtained the electrochemical impedance collection of illustrative plates of test specimen, there is corresponding relation in the changing features of electrochemical impedance collection of illustrative plates and the architectural characteristic of cement-based material, cracking and the development thereof that can reflect well cement-based material.
In order to realize the object of foregoing invention, technical scheme of the present invention is achieved in that
A method of utilizing electrochemical impedance spectroscopy Real-Time Monitoring cement-based material crack, comprises the following steps:
(1) pre-buried electrode slice or place while implementing in the estimation range of cement-based material test specimen, by wire, electrode slice is connected with electrochemical workstation data acquisition system (DAS), then electrochemical workstation data acquisition system (DAS) is connected with computer data processing system, realizes the automatic monitoring of test specimen crack variation and the continuous recording of data;
(2) by electrode slice, cement-based material test specimen is applied sinusoidal voltage (electric current) disturbing signal of different frequency, the disturbing signal of input produces corresponding response signal after test specimen, it is simple sinusoidal alternating current (voltage) signal, response signal, through electrochemical workstation data acquisition system (DAS) and computer data processing system, obtains the electrochemical impedance spectroscopy of test specimen under different frequency;
(3) by analyzing the changing features of electrochemical impedance spectroscopy, monitor the cracking situation of cement-based material crack.
Cement-based material test specimen is the cement-based material under all kinds of non-loads or load action in civil engineering work in described step (1).
In described step (1), the estimation range of cement-based material test specimen is not subject to the structure of cement-based material and the restriction of locus, can reflect accurately, all sidedly the cracking situation of cement-based material test specimen.
In described step (1) the electrode slice quantity of the estimation range of cement-based material test specimen be two and more than, its position can be placed in uniform or non-uniform mode according to actual needs.
In described step (2), signal frequency range comprises low-frequency range and high band, generally at 1mHz ~ 10MHz.
The sinusoidal ac flow valuve applying in described step (2) is generally lower than 50mA, or ac voltage is lower than 20mV.
In described step (2), the method for expressing of electrochemical impedance spectroscopy comprises the forms such as Warburg figure, dmittance chart, electric capacity figure, Nyquist figure and Bode figure, is preferably Nyquist figure and Bode figure.
In described step (3) there is corresponding relation in changing features and its architectural characteristic of the electrochemical impedance collection of illustrative plates of cement-based material test specimen.
The changing features of cement-based material test specimen electrochemical impedance collection of illustrative plates refers to parameter values such as phasing degree, angular frequency, impedance vector and mould value thereof within the scope of certain frequency domain and the situation of change of institute's respective function relation between them in described step (3).
The present invention's beneficial effect compared to existing technology:
The present invention utilize electrochemical impedance spectroscopy Real-Time Monitoring cement-based material crack principle design monitoring method and the monitoring device in cement-based material test specimen crack, there is measuring speed fast, antijamming capability is strong, the feature such as simple to operate, can be applicable to the dynamic change situation of the cement-based material crack under all kinds of non-loads in civil construction project or load action, be not subject to the structure of cement-based material test specimen and the restriction of locus, the overall process monitoring of realization to cement-based material test specimen cracking and crack progressing variation, durability prediction for cement-based material test specimen, taking in time corresponding reclamation activities and carrying out effective mass control provides information support, Evaluation and Prediction to architecture engineering material combination property is during one's term of military service significant.
Accompanying drawing explanation
Fig. 1 is the method monitoring schematic diagram that the present invention utilizes electrochemical impedance spectroscopy Real-Time Monitoring cement-based material crack.
Fig. 2 is electrochemical impedance spectroscopy and the test specimen shape appearance figure before nature expansive cement sill test specimen does not ftracture.
Fig. 3 is electrochemical impedance spectroscopy and test specimen shape appearance figure in nature expansive cement sill test specimen nature expansion process.
Fig. 4 is electrochemical impedance spectroscopy and the test specimen shape appearance figure of nature expansive cement sill test specimen nature expansion damage.
Fig. 5 is electrochemical impedance spectroscopy and the test specimen shape appearance figure before prefabricated crack cement-based material test specimen does not ftracture.
Fig. 6 is electrochemical impedance spectroscopy and test specimen shape appearance figure in the cement-based material test specimen cracking process of prefabricated crack.
Fig. 7 is electrochemical impedance spectroscopy and test specimen shape appearance figure after the cement-based material test specimen test specimen fracture of prefabricated crack.
embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
One, cement-base composite material test specimen is made
In specific embodiments of the invention, now through but not limited to following methods, prepare the cement-base composite material test specimen of wanting required for the present invention.Concrete preparation method's step of cement-base composite material test specimen is as follows:
First, take the components such as cement, admixture, sand, additive and water, Binder Materials is cement and admixture, and wherein the mass ratio of water and Binder Materials is 0.25:1, and the volume volume of PVA fiber accounts for 2% of mixture cumulative volume;
Then, the solid constituents such as the Binder Materials of weighing and sand are poured in agitated kettle and are stirred 1 ~ 2 minute, pour in agitated kettle again water and additive into stir about 2 minutes, PVA fiber is slowly joined in agitated kettle, be stirred to fiber dispersion evenly till;
Finally, mixture is injected to mould, the demoulding after 24 hours, the test specimen after the demoulding under the condition of 20 ± 2 ℃ of temperature, humidity 90 ± 5%, place fog room in maintenance 7 days, subsequently test specimen is placed on to laboratory (20 ± 2 ℃, humidity 55 ± 5%) maintenance until test length of time.
Two, monitoring system of the present invention forms and monitoring method
As shown in Figure 1, monitoring system of the present invention comprises that electrode slice 5(can make by oneself), wire 6, electrochemical workstation data acquisition system (DAS) 7 and computer data processing system 8; Working electrode 2 on working electrode 1 on the first electrode slice (can make by oneself), the first electrode slice (can make by oneself), the contrast electrode 3 on the second electrode slice (can make by oneself) and the auxiliary electrode 4 on the second electrode slice (can make by oneself) are connected with the input end of electrochemical workstation data acquisition system (DAS) 7 by wire 6 respectively; Electrochemical workstation data acquisition system (DAS) 7 is connected with computer data processing system 8 again.
Monitoring method of the present invention is a kind of method of utilizing electrochemical impedance spectroscopy Real-Time Monitoring cement-based material crack, comprises the following steps:
(1) when the pre-buried self-made electrode sheet 5 in the two ends, estimation range of cement-based material test specimen 9 or enforcement, place, by wire 6, electrode slice 5(can be made by oneself) be connected with electrochemical workstation data acquisition system (DAS) 7, then electrochemical workstation data acquisition system (DAS) 7 is connected with computer data processing system 8, realizes the automatic monitoring of test specimen 9 cracks variations and the continuous recording of data;
(2) by electrode slice 5(, can make by oneself) cement-based material test specimen 9 is applied to sinusoidal voltage (electric current) disturbing signal of different frequency, the disturbing signal of input produces corresponding response signal after test specimen 9, it is simple sinusoidal alternating current (voltage) signal, response signal is the processing with computer data processing system 8 through data acquisition system (DAS) 7, obtains the electrochemical impedance spectroscopy of test specimen 9;
(3) by analyzing the relation of different parameters on electrochemical impedance spectroscopy, monitor the cracking situation in cement-based material test specimen 9 cracks.
Cement-based material test specimen 9 is the cement-based material under all kinds of non-loads or load action in civil engineering work in described step (1).
The electrode slice 5(of the estimation range of cement-based material test specimen can make by oneself in described step (1)) quantity is two, at the two ends of the estimation range of cement-based material test specimen 9, a self-made electrode sheet is set respectively.
In described step (2), signal frequency range is 10mHz ~ 10kHz.
In described step (2), simple sinusoidal alternating current size is that 10mA or sinusoidal voltage size are 5mV.
In described step (2), the method for expressing of electrochemical impedance spectroscopy is Nyquist figure and Bode figure.
Three, embodiment 1: the detection of the natural swelling cracking process of cement-based material test specimen 9 (under no-load operating mode)
First, at the two ends of the estimation range of cement-based material test specimen 9, pre-buried electrode slice 5(can make by oneself respectively) (electrode slice 5 can be nickel electrode), then by wire 6, electrode slice 5 is connected with electrochemical workstation data acquisition system (DAS) 7, then electrochemical workstation data acquisition system (DAS) 7 is connected with computer data processing system 8; Secondly, the sinusoidal voltage disturbing signal of 10mHz ~ 10kHz frequency and 5mV amplitude can be made by oneself by electrode slice 5() (electrode slice 5 can be nickel electrode) be applied on cement-based material test specimen 9, through electrochemical workstation data acquisition system (DAS) 7, collect response signal, it is simple sinusoidal alternating current signal, by 8 pairs of response signals of collecting of computer data processing system, processed again, record the electrochemical impedance spectroscopy of this test specimen when different cracking degree.
Be electrochemical impedance spectrogram and the corresponding test specimen shape appearance figure of the natural swelling cracking process of cement-based material test specimen 9 as shown in Figure 2,3, 4, wherein Fig. 2 is electrochemical impedance spectroscopy and the test specimen shape appearance figure before nature expansive cement sill test specimen does not ftracture; Fig. 3 is electrochemical impedance spectroscopy and test specimen shape appearance figure in nature expansive cement sill test specimen nature expansion process; Fig. 4 is electrochemical impedance spectroscopy and the test specimen shape appearance figure of nature expansive cement sill test specimen nature expansion damage.From Fig. 2,3,4 Monitoring Data, within the scope of institute's monitoring frequency, the impedance maximal value of uncracked cement-based material test specimen is 20 k Ω, the electrochemical impedance real part of describing with Nyquist figure and the shape approximation of imaginary part relation are straight line, frequency-phase relation of describing with Bode figure be shaped as smooth curve, but while ftractureing havoc along with test specimen, under same frequency, the impedance of cement-based material test specimen enlarges markedly, even surpass 300 k Ω, and electrochemical impedance spectroscopy occur unstable, have a significant fluctuation.
Embodiment 2: 9 precompressed of cement-based material test specimen produce the detection (having under load working condition) in the cracking process of crack (prefabricated crack)
First, at the two ends of the estimation range of cement-based material test specimen 9, pre-buried electrode slice 5(can make by oneself respectively) (electrode slice 5 can be nickel electrode), then by wire 6, electrode slice 5 is connected with electrochemical workstation data acquisition system (DAS) 7, then electrochemical workstation data acquisition system (DAS) 7 is connected with computer data processing system 8; Secondly, the simple sinusoidal alternating current disturbing signal of 10mHz ~ 10kHz frequency and 10mA amplitude is applied on cement-based material test specimen 9 by electrode slice 5, through electrochemical workstation data acquisition system (DAS) 7, collect response signal, it is simple sinusoidal alternating current signal, by 8 pairs of response signals of collecting of computer data processing system, processed again, record the electrochemical impedance spectroscopy of this test specimen when different cracking degree.
As Fig. 5,6,7 is depicted as 9 precompressed of cement-based material test specimen, produce electrochemical impedance spectrogram and the corresponding test specimen shape appearance figure in the cracking process of crack (prefabricated crack), wherein Fig. 5 is electrochemical impedance spectroscopy and the test specimen shape appearance figure before prefabricated crack cement-based material test specimen does not ftracture; Fig. 6 is electrochemical impedance spectroscopy and test specimen shape appearance figure in the cement-based material test specimen cracking process of prefabricated crack; Fig. 7 is electrochemical impedance spectroscopy and test specimen shape appearance figure after the cement-based material test specimen test specimen fracture of prefabricated crack.From Fig. 5,6,7 Monitoring Data, within the scope of institute's monitoring frequency, the impedance maximum of the cement-based material test specimen of precompressed cracking does not approach 20 k Ω, the smooth curve that the real part of electrochemical impedance of describing with Nyquist figure and the shape of imaginary part relation are circular arc, the shape of frequency-phase angle relationship of describing with Bode figure is almost the smooth curve of normal distribution formula.But along with test specimen precompressed is ftractureed in the process rupturing, under same frequency, the impedance of cement-based material test specimen increases nearly thousand times, and the shape of electrochemical impedance spectroscopy becomes tortuous mixed and disorderly, irregular.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. a method of utilizing electrochemical impedance spectroscopy Real-Time Monitoring cement-based material crack, is characterized in that: described specifically comprises the following steps:
(a) when the pre-buried electrode slice in the estimation range of cement-based material test specimen (9) (5) or enforcement, place, by wire (6), electrode slice (5) is connected with electrochemical workstation data acquisition system (DAS) (7), then electrochemical workstation data acquisition system (DAS) (7) is connected with computer data processing system (8), realizes the automatic monitoring of test specimen (9) crack variation and the continuous recording of data;
(b) by electrode slice (5), cement-based material test specimen (9) is applied sinusoidal voltage (electric current) disturbing signal of different frequency, the disturbing signal of input produces corresponding response signal after test specimen (9), it is simple sinusoidal alternating current (voltage) signal, response signal, through the processing of electrochemical workstation data acquisition system (DAS) (7) and computer data processing system (8), obtains the electrochemical impedance spectroscopy of test specimen (9) under different frequency;
(c) by analyzing the changing features of electrochemical impedance spectroscopy, monitor the cracking situation in cement-based material test specimen (9) crack.
2. a kind of method of utilizing electrochemical impedance spectroscopy Real-Time Monitoring cement-based material crack according to claim 1, is characterized in that: in described step (a), cement-based material test specimen (9) is the cement-based material under all kinds of non-loads or load action in civil engineering work.
3. a kind of method of utilizing electrochemical impedance spectroscopy Real-Time Monitoring cement-based material crack according to claim 1, is characterized in that: in described step (a), the estimation range of cement-based material test specimen (9) is not subject to the structure of cement-based material and the restriction of locus.
4. a kind of method of utilizing electrochemical impedance spectroscopy Real-Time Monitoring cement-based material crack according to claim 1, it is characterized in that: in described step (a) electrode slice (5) quantity of the estimation range of cement-based material test specimen (9) be two and more than, place in uniform or non-uniform mode its position.
5. a kind of method of utilizing electrochemical impedance spectroscopy Real-Time Monitoring cement-based material crack according to claim 1, is characterized in that: in described step (b), signal frequency range comprises low-frequency range and high band, generally at 1mHz ~ 10MHz.
6. a kind of method of utilizing electrochemical impedance spectroscopy Real-Time Monitoring cement-based material crack according to claim 1, is characterized in that: the middle sinusoidal ac flow valuve of described step (b) is generally lower than 50mA, or alternating voltage is generally lower than 20mV.
7. a kind of method of utilizing electrochemical impedance spectroscopy Real-Time Monitoring cement-based material crack according to claim 1, it is characterized in that: in described step (b), the method for expressing of electrochemical impedance spectroscopy comprises the forms such as Warburg figure, dmittance chart, electric capacity figure, Nyquist figure and Bode figure, is preferably Nyquist figure and Bode figure.
8. a kind of method of utilizing electrochemical impedance spectroscopy Real-Time Monitoring cement-based material crack according to claim 1, is characterized in that: in described step (b), changing features and its architectural characteristic of the electrochemical impedance collection of illustrative plates of cement-based material test specimen (9) exist corresponding relation.
9. a kind of method of utilizing electrochemical impedance spectroscopy Real-Time Monitoring cement-based material crack according to claim 1, is characterized in that: the changing features of described electrochemical impedance collection of illustrative plates refer to parameter values such as phasing degree, angular frequency, impedance vector and mould value thereof within the scope of certain frequency domain with and the situation of change of institute's respective function relation.
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| CN104697725A (en) * | 2015-03-17 | 2015-06-10 | 华北电力科学研究院有限责任公司 | Pneumatic flexible shield electrode |
| CN106501091A (en) * | 2016-10-21 | 2017-03-15 | 河南理工大学 | A kind of method of complicated intrinsic fracture structure in simulation coal petrography body |
| CN107505357A (en) * | 2017-08-07 | 2017-12-22 | 石家庄铁道大学 | A kind of alkali-aggregate reaction Tachistoscope method and test device |
| WO2018045593A1 (en) * | 2016-09-12 | 2018-03-15 | 深圳大学 | Cement-based material drying depth testing method |
| CN108318403A (en) * | 2018-04-10 | 2018-07-24 | 深圳大学 | A kind of cement-based material pervasion test device |
| CN109164143A (en) * | 2018-09-30 | 2019-01-08 | 柳州欧维姆结构检测技术有限公司 | Drag-line corrosion monitor and its method for prestressed cable corrosion monitoring |
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| CN115201285A (en) * | 2021-04-09 | 2022-10-18 | 南京理工大学 | Method for testing compressive strength of cement-based material |
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| CN108318403B (en) * | 2018-04-10 | 2024-04-19 | 深圳大学 | Cement-based material penetration test device |
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| CN104697725A (en) * | 2015-03-17 | 2015-06-10 | 华北电力科学研究院有限责任公司 | Pneumatic flexible shield electrode |
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| CN107505357A (en) * | 2017-08-07 | 2017-12-22 | 石家庄铁道大学 | A kind of alkali-aggregate reaction Tachistoscope method and test device |
| CN108318403A (en) * | 2018-04-10 | 2018-07-24 | 深圳大学 | A kind of cement-based material pervasion test device |
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| CN109164143A (en) * | 2018-09-30 | 2019-01-08 | 柳州欧维姆结构检测技术有限公司 | Drag-line corrosion monitor and its method for prestressed cable corrosion monitoring |
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| WO2020100641A1 (en) * | 2018-11-15 | 2020-05-22 | 日本電信電話株式会社 | Crack detection device and method therefor |
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| CN109930155A (en) * | 2019-03-22 | 2019-06-25 | 中国矿业大学 | A kind of electrochemical method deteriorating concrete repairing and reinforcement |
| CN111577266A (en) * | 2020-05-13 | 2020-08-25 | 河南理工大学 | Electrochemical prediction method for shale reservoir oil saturation |
| CN111577266B (en) * | 2020-05-13 | 2023-08-22 | 河南理工大学 | Electrochemical prediction method for shale reservoir oil saturation |
| CN115201285A (en) * | 2021-04-09 | 2022-10-18 | 南京理工大学 | Method for testing compressive strength of cement-based material |
| CN115201285B (en) * | 2021-04-09 | 2024-04-05 | 南京理工大学 | Method for testing compressive strength of cement-based material |
| CN114264557A (en) * | 2021-12-14 | 2022-04-01 | 中原工学院 | Rock acid fracturing coupling seam network real-time monitoring system and method under gravity pressurization |
| CN115684279A (en) * | 2022-10-31 | 2023-02-03 | 江苏科技大学 | Quantitative test device and method for crack self-repairing effect of cement-based material |
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Application publication date: 20140820 |