Method and system for real-time evaluation of concrete member body strength

Abstract

The application belongs to the technical field of intelligent detection of concrete quality in building engineering, and discloses a real-time evaluation method and system for the strength of a concrete member body, which comprises the following steps: S1, embedding the passive ultrasonic reflector in the center position of the concrete member; S2, using the ultrasonic equipment to emit ultrasonic detection signals to the concrete member in real time and collecting echo signals; S3, calculating the initial strength of the concrete member; S5, calculating the real strength of the concrete member; S6, comparing the real strength with a preset warning value to evaluate whether the concrete member is qualified. Through the strength calculation model and the correction model, the application avoids single parameter detection errors, and the detection accuracy far exceeds that of traditional methods, and the data is real, stable and reliable. By setting the passive ultrasonic reflector, the application realizes full-life-cycle nondestructive monitoring, passive power supply and wiring-free, and can realize dynamic monitoring of the concrete in the full life cycle from forming, maintenance to use without structural damage.

Description

Technical Field

[0001] This invention belongs to the field of intelligent detection technology for concrete quality in building engineering, and specifically relates to a method and system for real-time evaluation of the strength of concrete components. Background Technology

[0002] Currently, the concrete strength assessment system in the domestic and overseas construction industry relies entirely on traditional testing methods, which are mainly divided into three categories: test block compressive strength test, surface rebound test, and core sampling test. This system has industry-wide and disruptive technical shortcomings, cannot truly reflect the actual strength of the concrete structure itself, and has prominent loopholes in quality control.

[0003] The specific defects of the existing technology are as follows: 1. Test block compressive strength test: The standard test blocks left on site are independently cast and cured according to standard. The temperature, humidity, vibration compaction and molding environment of the on-site components are very different from those of the on-site components which are cast and cured in situ. The strength of the test blocks can deviate from the strength of the structure itself by 10% to 30%. In addition, there are problems such as missed tests and overdue tests. The data can be tampered with and replaced, and cannot represent the true quality of the actual structure.

[0004] 2. Rebound test: This method only tests the strength of the surface 2-3mm mortar layer of concrete components and cannot test the strength of the core area of ​​the components. It is greatly affected by surface carbonization, moisture, grinding and repair, and surface peeling. The test accuracy is low and the dispersion is large. It cannot reflect the true strength state of the core concrete in the center of the wall, column, and slab.

[0005] 3. Core drilling method: This is a destructive testing method that can only perform sampling inspections and cannot achieve full coverage. It has high testing costs and low efficiency, and can cause permanent damage to the structure, requiring subsequent repairs. It cannot be used for dynamic monitoring of concrete strength throughout the entire process.

[0006] Therefore, we propose a method and system for real-time evaluation of the strength of concrete components to solve the above problems. Summary of the Invention

[0007] To address the aforementioned issues, this invention provides a method and system for real-time evaluation of the strength of concrete components, which solves the problems of data distortion, one-sided testing, strong destructiveness, low level of intelligence, and inability to adapt to complex construction scenarios in existing concrete strength testing technologies.

[0008] This invention is achieved through the following scheme: a method for real-time evaluation of the strength of a concrete component, comprising the following steps: S1. Provide a passive ultrasonic reflector and embed the passive ultrasonic reflector in the center of the concrete component; S2. Provide an ultrasonic device, which transmits ultrasonic detection signals to the concrete component in real time and collects the echo signals reflected by the passive ultrasonic reflector. The echo signals include sound velocity data, amplitude data and main frequency data. S3. Construct a strength calculation model, input the echo signal into the strength calculation model, and calculate the initial strength of the concrete member; S4. Real-time collection of curing information of concrete components, including ambient temperature, ambient humidity and age parameters; S5. Construct a correction model, input the initial strength and curing information into the correction model, and calculate the true strength of the concrete member; S6. Compare the actual strength with the preset warning value to determine whether the concrete component is qualified.

[0009] A further improvement of the real-time strength assessment method for concrete components of the present invention is that, during step S3, the strength calculation model calculates the input echo signal based on a strength calculation function, wherein the strength calculation function is: ; in, The initial strength of the concrete body; The measured value of the ultrasonic propagation speed in the sound speed data; The mean effective amplitude of the echo signal in the amplitude data; This refers to the echo frequency offset in the main frequency data; , , These are the fitting coefficients; It is the basic error correction constant.

[0010] A further improvement of the real-time strength assessment method for concrete components of the present invention is that, during step S5, the correction model calculates the input initial strength and curing information based on a dynamic correction function, wherein the dynamic correction function is: ; in, This represents the true strength of the concrete itself. The initial strength of the concrete body; This is the temperature influence coefficient; Ambient temperature; Humidity influence coefficient; For ambient humidity; This is a curing age correction function that is dynamically updated as the concrete curing age increases.

[0011] A further improvement of the real-time strength assessment method for concrete components of the present invention is that the warning value is a dynamic warning value.

[0012] A further improvement of the real-time strength assessment method for concrete components of the present invention lies in that the dynamic warning value is updated according to an iterative update formula, wherein the iterative update formula is: ; in, This is the warning value; This represents the average strength value of the concrete member measured multiple times recently. The strength dispersion coefficient; This is the minimum allowable strength value for the design.

[0013] A further improvement of the real-time strength assessment method for concrete components of the present invention is that, after performing step S6, it further includes the following step: S7. If the concrete component is unqualified and its strength growth is lagging, an early warning will be triggered and a rectification instruction will be sent.

[0014] A further improvement of the real-time strength assessment method for concrete components of the present invention is that, after performing step S7, it further includes the following step: S8. Encrypt and archive all data to form a traceable data chain throughout the entire lifecycle.

[0015] A further improvement of the real-time strength assessment method for concrete components of the present invention is that, before executing step S3, the echo signal is preprocessed by noise reduction and filtering, and when executing step S3, the echo signal after noise reduction and filtering is input into the strength model for calculation.

[0016] A further improvement of the real-time strength assessment method for concrete components of the present invention is that the concrete component includes a steel reinforcement cage and a concrete body; When performing step S1, the passive ultrasonic reflector is fixed at the center of the steel reinforcement cage. Concrete is poured to enclose the steel reinforcement cage and the passive ultrasonic reflector to form a concrete body, with the passive ultrasonic reflector located at the center of the concrete body.

[0017] A real-time strength assessment system for concrete structural members, used to implement the method described above, the system comprising: A passive ultrasonic reflector is embedded in the center of the concrete component to be tested to reflect ultrasonic detection signals. An ultrasonic device is used to transmit ultrasonic detection signals to the concrete component to be tested and to collect the echo signals reflected by the passive ultrasonic reflector. The data acquisition device is used to collect curing information of the concrete component to be tested. The strength calculation unit is used to perform calculations based on the input echo signal to obtain the initial strength of the concrete member; The correction unit is used to perform calculations based on the input maintenance information to obtain the true strength of the concrete component; The evaluation module is used to compare the actual strength with the preset warning value to evaluate whether the concrete component is qualified.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention avoids single-parameter detection errors through strength calculation and correction models, achieving detection accuracy far exceeding traditional methods. The deviation from core drilling measured strength is ≤3%, and the data is authentic, stable, and reliable. By setting up passive ultrasonic reflectors, it enables non-destructive monitoring throughout the entire life cycle of concrete. It is passive, requires no power supply, and requires no wiring, enabling dynamic monitoring of concrete throughout its entire life cycle from forming, curing, and use without structural damage. Attached Figure Description

[0019] Figure 1 A flowchart of the real-time strength assessment method for concrete components according to the present invention is shown.

[0020] Figure 2 A schematic diagram of the overall system framework modules of the present invention is shown.

[0021] Figure 3 A schematic diagram showing the location of the traceability QR code of this invention is provided.

[0022] Figure 4 A schematic diagram of the fixed position of the passive ultrasonic reflector of the present invention is shown. Detailed Implementation

[0023] To address the problems of distorted data, limited testing methods, high destructiveness, low intelligence, and inability to adapt to complex construction scenarios in existing concrete strength testing technologies, this invention provides a method and system for real-time assessment of the strength of concrete components. The following detailed description, in conjunction with accompanying drawings, illustrates this method and system for real-time assessment of the strength of concrete components.

[0024] See Figures 1-4 As shown, a method for real-time evaluation of the strength of a concrete component includes the following steps: S1. Provide a passive ultrasonic reflector and embed the passive ultrasonic reflector in the center of the concrete component; S2. Provide an ultrasonic device, which is used to transmit ultrasonic detection signals to the concrete component in real time and collect the echo signals reflected by the passive ultrasonic reflector. The echo signals include sound velocity data, amplitude data and main frequency data. S3. Construct a strength calculation model, input the sound velocity data, amplitude data and dominant frequency data into the strength calculation model, and calculate the initial strength of the concrete member; S4. Real-time collection of curing information for concrete components, including ambient temperature, ambient humidity, and age parameters; S5. Construct a correction model, input the initial strength, ambient temperature, ambient humidity and age parameters into the correction model, and calculate the true strength of the concrete member; S6. Compare the actual strength with the preset warning value to determine whether the concrete component is qualified.

[0025] By using strength calculation and correction models, the error of single-parameter detection is avoided, and the detection accuracy far exceeds that of traditional methods. The deviation from the core drilling measured strength is ≤3%, and the data is true, stable, and reliable. By setting up passive ultrasonic reflectors, non-destructive monitoring is achieved throughout the entire life cycle. It is passive, requires no power supply, and requires no wiring, enabling dynamic monitoring of concrete throughout its entire life cycle from forming, curing, and use, without structural damage. The entire process abandons the traditional test block compressive strength, surface rebound, and core drilling sampling methods. The core strength of the component body, calculated and analyzed from the data collected by pre-embedded anchor points, is used as the sole basis for evaluating the concrete strength.

[0026] In this embodiment, the test data is free from human intervention and tampering, and the test accuracy is 42% higher than that of the traditional rebound method. The deviation from the measured strength of the core drilling method is ≤3%, which can completely replace the test block, rebound, and core drilling test methods. There is no need to make, maintain, or test the test blocks, and no need for destructive core drilling. The quality test cost of a single project can be reduced by 15% to 25%, and the test efficiency can be increased by more than 10 times.

[0027] Furthermore, 200mm thick partition walls, 600*600mm concrete columns, and 120mm thick cast-in-place floor slabs of ordinary residential buildings were selected as the implementation objects to adapt to the conventional construction conditions in China, while also being compatible with the high temperature and high humidity construction environment of 30~35℃ abroad. The passive ultrasonic reflector uses a piezoelectric ceramic passive reflector chip encapsulated in epoxy resin, with a diameter of 15mm and a thickness of 2mm. The compressive strength of the piezoelectric ceramic passive reflector chip is ≥60MPa, which is fully compatible with the vibration pressure of concrete pouring. It requires no power supply and no wiring. The passive ultrasonic reflector only has the function of accurately reflecting ultrasonic signals, without signal transmission or data storage functions, which completely avoids the problems of battery failure, circuit damage and signal drift of active devices, and meets the needs of full life cycle monitoring of concrete.

[0028] Specifically, during step S2, ultrasonic data acquisition is carried out at 7d, 14d, and 28d of age. The ultrasonic equipment is used to emit a 40kHz fixed frequency ultrasonic signal at the anchor point to collect three core data: echo velocity, amplitude, and main frequency, and bind real-time temperature and humidity, curing time, and timestamp information.

[0029] In step S3, the intensity calculation model calculates the input sound velocity data, amplitude data, and dominant frequency data based on the intensity calculation function, which is: ; in, The initial strength of the concrete body; This refers to the measured value of the ultrasonic propagation speed in the sound speed data; This represents the average effective amplitude of the echo signal in the amplitude data. This refers to the echo frequency offset in the main frequency data. , , These are the fitting coefficients; It is the basic error correction constant.

[0030] By adopting the above design, the coupling relationship between three independent acoustic characteristics—sound velocity, amplitude, and dominant frequency—is integrated to construct a nonlinear intensity calculation function, thus overcoming the deficiency of low accuracy in single-parameter calculation in existing technologies.

[0031] In step S5, the modified model calculates the input initial intensity, ambient temperature, ambient humidity, and age parameters based on a dynamic correction function, which is: ; in, This represents the true strength of the concrete itself. The initial strength of the concrete body; This is the temperature influence coefficient; Ambient temperature; Humidity influence coefficient; For ambient humidity; The function is a curing age correction function (this correction function is existing technology and will not be elaborated on here), which is dynamically updated with the curing age of concrete to conform to the actual strength growth law.

[0032] By adopting the above design, a dynamic correction function is constructed to adaptively correct the strength calculation drift caused by high temperature and humidity, low temperature and dryness, and age-related differences. The core true strength of the component is output, and the strength calculation deviation caused by regional construction differences is eliminated by the environmental adaptive correction model. This enables accurate assessment of overseas concrete strength and adapts to various construction environments at home and abroad.

[0033] Among them, the warning value is a dynamic warning value.

[0034] The dynamic warning value is updated according to an iterative update formula, which is: ; in, This is the warning value; This represents the average strength value of the concrete member measured multiple times recently. The strength dispersion coefficient; To design the minimum allowable strength value and achieve adaptive, localized, and accurate determination.

[0035] By adopting the above design, unlike the traditional fixed intensity threshold, this method dynamically updates the intensity warning value based on the top ten sets of valid monitoring data of the project and the regional historical database, thus avoiding the error of a single threshold judgment.

[0036] After step S6 is completed, the following steps are also included: S7. If a concrete component is substandard and its strength growth is lagging, an early warning will be triggered and a rectification order will be sent.

[0037] By adopting the above design, if the concrete components are unqualified or the growth is lagging, an early warning will be triggered and a rectification instruction will be sent, so as to achieve reasonable monitoring of the construction.

[0038] After step S7 is completed, the following steps are also included: S8. Encrypt and archive all data to form a traceable data chain throughout the entire lifecycle.

[0039] By adopting the above design, the data source timestamp is solidified and encrypted for evidence storage, eliminating the space for human intervention and tampering. This enables the entire method to form a closed-loop control system of monitoring, evaluation, early warning, rectification, and archiving, completely replacing the decades-old test block, rebound, and core drilling testing mode. It fundamentally solves the industry pain points of surface testing distortion and destructive testing, and uses the true strength of the core structure as the sole evaluation criterion, achieving a fundamental innovation in concrete quality assessment.

[0040] Before executing step S3, the echo signal is preprocessed with noise reduction filtering. When executing step S3, the echo signal (sound speed data, amplitude data and main frequency data) after noise reduction filtering is input into the intensity model for calculation.

[0041] By adopting the above design to eliminate abnormal and interfering data, the accuracy of calculations can be greatly improved.

[0042] Among them, see Figure 4 As shown, the concrete member includes a steel reinforcement cage 3 and a concrete body 4; When performing step S1, the passive ultrasonic reflector 6 is fixed at the center of the steel reinforcement frame 3. The steel reinforcement frame 3 and the passive ultrasonic reflector 6 are wrapped with concrete to form a concrete body 4, and the passive ultrasonic reflector 6 is located at the center of the concrete body 4.

[0043] Furthermore, the passive ultrasonic reflector is anchored as follows: centered on a 200mm partition wall at a height of 1.3m; one anchor is placed at the center of a 600*600 column section; and one anchor is placed at the center of a 120mm thick floor slab, with one anchor per floor slab span. All anchors are positioned by steel reinforcement binding and fixed to the steel reinforcement cage 3 by a special plastic positioning seat 5 before pouring to prevent displacement during pouring. See Figure 3 As shown, a cross-shaped positioning mark 1 and a unique traceability QR code 2 are sprayed on the outside of the template to facilitate traceability analysis and monitoring management.

[0044] By fixing the passive ultrasonic reflector, positional displacement can be prevented during concrete pouring, thus eliminating pouring deviation.

[0045] A real-time strength assessment system for concrete structural members, used to implement the method described above, the system comprising: A passive ultrasonic reflector is embedded in the center of the concrete component to be tested to reflect ultrasonic detection signals. Ultrasonic equipment is used to transmit ultrasonic detection signals to the concrete component to be tested and to collect the echo signals reflected by the passive ultrasonic reflector. The echo signals include sound velocity data, amplitude data and dominant frequency data. The data acquisition device is used to collect curing information of the concrete component to be tested, including ambient temperature, ambient humidity and age parameters. The strength calculation unit is used to calculate the initial strength of the concrete member based on the input sound velocity data, amplitude data, and dominant frequency data. The correction unit is used to calculate the true strength of the concrete member based on the input initial strength, ambient temperature, ambient humidity and age parameters. The evaluation module is used to compare the actual strength with the preset warning value to determine whether the concrete component is qualified.

[0046] There is no need to make, maintain, or pressure test standard test blocks, and no need for a large amount of core drilling repair work, which greatly reduces labor, material, and equipment costs. The cost of testing a single project is reduced by 15% to 25%, the testing efficiency is increased by more than 10 times, and the construction and acceptance cycle is shortened.

[0047] Furthermore, the ultrasonic equipment integrates a signal transmission module, an echo signal acquisition module, a timestamp synchronization module, and a local caching module. The intensity calculation unit and correction unit are all located within the edge intelligent computing terminal (a lightweight edge box deployed at the construction site). Real-time data processing can be completed on-site without cloud computing power. The ultrasonic equipment transmits echo signals to the edge intelligent computing terminal via 5G / Bluetooth / wired methods. Data can be cached locally when the network is offline and automatically retransmitted after the network is connected, ensuring data continuity. The edge-end localized computing has low latency, high security, and is not affected by network status. It also has a built-in unified timestamp solidification module to achieve uniformity in the time dimension of all monitoring data, preventing data tampering and time sequence disorder, and adapting to complex working conditions at the construction site. See Figure 2 As shown, it also includes a cloud-based management and control platform, which is used to aggregate strength monitoring data of various projects and components, build a regional concrete strength database, continuously iterate and optimize algorithm models, store full life cycle monitoring data, and realize unified management, traceability analysis and trend statistics of strength data of multiple projects and multiple buildings, providing core data support for big data management and intelligent optimization of concrete quality in the industry.

[0048] It also includes a multi-level early warning visualization module, which links on-site terminals, mobile APP, and project management dashboard for three-level display. It can automatically trigger early warnings for issues such as low intensity, abnormal intensity growth, and excessive data fluctuations, and supports rectification entry, online approval, and closed-loop record keeping.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. Those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A method for real-time evaluation of the strength of a concrete component, characterized in that, Includes the following steps: S1. Provide a passive ultrasonic reflector and embed the passive ultrasonic reflector in the center of the concrete component; S2. Provide an ultrasonic device, which transmits ultrasonic detection signals to the concrete component in real time and collects the echo signals reflected by the passive ultrasonic reflector. The echo signals include sound velocity data, amplitude data and main frequency data. S3. Construct a strength calculation model, input the echo signal into the strength calculation model, and calculate the initial strength of the concrete member; S4. Real-time collection of curing information of concrete components, including ambient temperature, ambient humidity and age parameters; S5. Construct a correction model, input the initial strength and curing information into the correction model, and calculate the true strength of the concrete member; S6. Compare the actual strength with the preset warning value to determine whether the concrete component is qualified.

2. The method for real-time evaluation of the strength of concrete components as described in claim 1, characterized in that, During step S3, the intensity calculation model calculates the input echo signal based on the intensity calculation function, which is: ； in, The initial strength of the concrete body; The measured value of the ultrasonic propagation speed in the sound speed data; The mean effective amplitude of the echo signal in the amplitude data; This refers to the echo frequency offset in the main frequency data; , , These are the fitting coefficients; It is the basic error correction constant.

3. The method for real-time evaluation of the strength of concrete components as described in claim 2, characterized in that, During step S5, the correction model calculates the input initial intensity and maintenance information based on a dynamic correction function, which is: ； in, This represents the true strength of the concrete itself. The initial strength of the concrete body; This is the temperature influence coefficient; Ambient temperature; Humidity influence coefficient; For ambient humidity; This is a curing age correction function that is dynamically updated as the concrete curing age increases.

4. The method for real-time evaluation of the strength of concrete components as described in claim 1, characterized in that, The warning value is a dynamic warning value.

5. The method for real-time evaluation of the strength of concrete components as described in claim 4, characterized in that, The dynamic warning value is updated according to an iterative update formula, which is: ； in, This is the warning value; This represents the average strength value of the concrete member measured multiple times recently. The strength dispersion coefficient; This is the minimum allowable strength value for the design.

6. The method for real-time evaluation of the strength of concrete components as described in claim 1, characterized in that, After step S6 is completed, the following steps are also included: S7. If the concrete component is unqualified and its strength growth is lagging, an early warning will be triggered and a rectification instruction will be sent.

7. The method for real-time evaluation of the strength of concrete components as described in claim 6, characterized in that, After step S7 is completed, the following steps are also included: S8. Encrypt and archive all data to form a traceable data chain throughout the entire lifecycle.

8. The method for real-time evaluation of the strength of concrete components as described in claim 1, characterized in that, Before executing step S3, the echo signal is preprocessed with noise reduction filtering. When executing step S3, the echo signal after noise reduction filtering is input into the intensity model for calculation.

9. The method for real-time evaluation of the strength of concrete components as described in claim 1, characterized in that, The concrete component includes a steel reinforcement cage and a concrete body; When performing step S1, the passive ultrasonic reflector is fixed at the center of the steel reinforcement cage. Concrete is poured to enclose the steel reinforcement cage and the passive ultrasonic reflector to form a concrete body, with the passive ultrasonic reflector located at the center of the concrete body.

10. A real-time strength assessment system for concrete components, used to implement the method as described in claim 1, characterized in that, The system includes: A passive ultrasonic reflector is embedded in the center of the concrete component to be tested to reflect ultrasonic detection signals. An ultrasonic device is used to transmit ultrasonic detection signals to the concrete component to be tested and to collect the echo signals reflected by the passive ultrasonic reflector. The data acquisition device is used to collect curing information of the concrete component to be tested. The strength calculation unit is used to perform calculations based on the input echo signal to obtain the initial strength of the concrete member; The correction unit is used to perform calculations based on the input maintenance information to obtain the true strength of the concrete component; The evaluation module is used to compare the actual strength with the preset warning value to evaluate whether the concrete component is qualified.

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