Intelligent strength measurement system of high-substitution-rate recycled concrete by ultrasonic-rebound combined method

Abstract

The application discloses a kind of high substitution rate recycled concrete's ultrasonic rebound comprehensive method intelligent strength measuring system, including host computer, rebound signal acquisition module, ultrasonic signal acquisition and processing module, man-machine interaction module and power module, host computer, rebound signal acquisition module, ultrasonic signal acquisition and processing module, man-machine interaction module are sequentially connected.The application has beneficial effects: host computer storage unit prestore is for different recycled coarse aggregate substitution rate Special strength formula;The substitution rate of measured object is input by man-machine interaction module, core processing unit is automatically called corresponding formula, and rebound value and ultrasonic velocity value collected are substituted into calculation in real time, and the compressive strength estimation result is directly output on site, realizes the specialization, intelligentization and integration of high substitution rate recycled concrete strength nondestructive testing, solves the problem that general equipment is not applicable, manual calculation is prone to error, high precision, high efficiency, effectively supports recycled concrete engineering quality control.

Description

Technical Field

[0001] This invention relates to the field of building engineering quality testing equipment technology, and in particular to an intelligent strength testing system for high-replacement-rate recycled concrete using the ultrasonic rebound combined method. Background Technology

[0002] The ultrasonic rebound method is a commonly used non-destructive testing method for concrete, and its core equipment includes a rebound hammer and an ultrasonic testing instrument. Currently, most equipment on the market consists of separate instruments with distinct functions: the rebound hammer is only used to collect rebound values, and the ultrasonic testing instrument is only used to collect sound velocity data. Subsequent strength conversion requires manual review of specifications, selection of strength measurement curves, and manual calculation, or reliance on external computer processing. For recycled concrete with a high replacement rate (recycled coarse aggregate replacement rate ≥30%), the correlation between its strength and sound velocity and rebound value differs significantly from that of ordinary concrete, requiring the use of specific dedicated strength measurement curves.

[0003] Existing general-purpose testing equipment has the following drawbacks: (1) Cannot automatically adapt to special curves: The strength test curves stored in the equipment are all national or regional curves for ordinary concrete and are derived from conventional concrete. They cannot handle recycled concrete, especially the differentiated curves under different replacement rates.

[0004] (2) The operation is cumbersome and prone to errors: the testing personnel need to record the original data on site, and afterwards, based on the replacement rate information provided by the project, they need to manually find and apply the corresponding complex formulas to calculate. The process is cumbersome and prone to errors.

[0005] (3) Low level of intelligence: Data collection, curve selection, intensity calculation, report generation and other links are fragmented, making it impossible to achieve the integration of "detection-analysis-results" on site, resulting in low efficiency.

[0006] Therefore, it is necessary to propose an intelligent strength measurement system and method for high-replacement-rate recycled concrete using the ultrasonic rebound integrated method to address the above-mentioned technical problems. Summary of the Invention

[0007] To address the shortcomings of the existing technologies, the present invention aims to provide an intelligent strength testing system for high-replacement-rate recycled concrete using the ultrasonic rebound method. This system is highly integrated, intelligently operated, and capable of automatically matching and applying a dedicated strength testing curve for high-replacement-rate recycled concrete, enabling integrated, on-site operation from data acquisition to strength estimation.

[0008] An intelligent strength measurement system for high-replacement-rate recycled concrete using the ultrasonic rebound combined method includes a host, a rebound signal acquisition module, an ultrasonic signal acquisition and processing module, a human-computer interaction module, and a power supply module. The host, rebound signal acquisition module, ultrasonic signal acquisition and processing module, and human-computer interaction module are connected in sequence, and the power supply module provides power to the host, rebound signal acquisition module, ultrasonic signal acquisition and processing module, and human-computer interaction module respectively.

[0009] Preferably, the host computer includes a core processing unit and a storage unit; The storage unit pre-stores multiple sets of specialized strength measurement formulas for the ultrasonic rebound comprehensive method for different recycled coarse aggregate replacement rates. The general formula is: In the formula: a is the constant term coefficient; b and c are regression constants; fcu,e is the converted value of compressive strength; V is the ultrasonic velocity value after correction for the test area; R is the rebound coefficient after correction for the test area.

[0010] Preferably, the rebound signal acquisition module is connected to or integrated with a standard mechanical rebounder to acquire and digitize the impact energy signal of the rebounder or directly read the rebound value and transmit the data to the core processing unit.

[0011] Preferably, the ultrasonic signal acquisition and processing module is connected to the ultrasonic transducer and is used to emit ultrasonic waves, receive signals, measure sound time, calculate sound velocity, and transmit sound velocity data to the core processing unit.

[0012] Preferably, the human-computer interaction module includes an input unit for the testing personnel to input or select the information on the replacement rate of recycled coarse aggregate in the currently tested recycled concrete component.

[0013] Preferably, it also includes a report generation module, a positioning module, and a wireless data transmission module. The report generation module is used to integrate the test data and results and automatically generate a structured test report. The report generation module, the positioning module, and the wireless data transmission module are all electrically connected to the host.

[0014] A method for an intelligent strength measurement system using an ultrasonic rebound combined method for high-replacement-rate recycled concrete, comprising the following steps: S1. Receive substitution rate information from the input unit; S2. Based on the substitution rate information, the matching dedicated strength measurement formula is automatically retrieved from the storage unit; S3. Simultaneously receive the rebound value R from the rebound signal acquisition module and the sound velocity value V from the ultrasonic signal acquisition and processing module; S4. Substitute R and V into the dedicated strength measurement formula to calculate and generate the concrete compressive strength conversion value in real time. S5. Output the strength conversion value, raw data and formula information used to the display unit of the human-computer interaction module for display, and can store or transmit them.

[0015] The algorithm steps for the rebound signal acquisition module are as follows: S11. Signal Acquisition and Conversion: A displacement sensor (photoelectric / inductive / accelerometer type) captures the rebound displacement after the impact of the hammer, converting the mechanical signal into a voltage / current signal. The conversion formula is as follows: V out =k s ×Δx+V offset ; V out k is the sensor output voltage. s For sensor sensitivity; V is the rebound displacement of the hammer; offset This is the zero-position offset voltage of the sensor; S12, Analog signal preprocessing; S13, Analog-to-digital conversion: Set the ADC sampling rate, perform discrete sampling on the filtered analog signal, quantize it into a digital signal, and transmit it to the microprocessor; The modular conversion formula is D=round[(V filtered -V min )×2 N-1 / (V max -V min )]; Where D is the digital output value, N is the ADC bit width, and V... min For the minimum input voltage, V max Maximum input voltage; S14, Digital Signal Processing; S15. Data calibration and correction, including angle correction and carbonization depth correction. The angle correction formula is as follows: R a =R+K θ ;where R a K represents the springback value after angle correction. θ This is the angle correction factor; Its carbonization depth correction formula is: f cu =a×R a b ×(10d) c Where f cu is the converted value of concrete compressive strength; a, b, and c are the coefficients of the strength measurement curve; d is the carbonation depth. S16. Data post-processing and output, R m or f cuIt can be displayed on an LCD screen, store data in local storage, and be transmitted to mobile terminals / cloud via Bluetooth.

[0016] The algorithm steps of the ultrasonic signal acquisition and processing module are as follows: S21. Ultrasonic signal reception and preamplification: Receives and amplifies analog ultrasonic signals. The signal reception formula is: ,in This is the raw echo signal from the ultrasonic transducer; To amplify the gain, This is the amplified signal; S22, Bandpass filtering for noise reduction; S23, ADC analog-to-digital conversion; S24, Remove DC bias; S25. Ultrasonic envelope extraction, where the extraction formula is: , For Hilbert transform; For the signal envelope; S26, Time-of-Flight (TOF) detection of the first wave arrival time. ; The sampling point for the first peak; The sampling period.

[0017] Compared with the prior art, the present invention has the following advantages: 1. The host storage unit pre-stores dedicated strength testing formulas for different replacement rates of recycled coarse aggregates. During testing, the replacement rate of the object being tested is input through the human-machine interaction module, and the core processing unit automatically calls the corresponding formula and substitutes the collected rebound value and ultrasonic velocity value into the calculation in real time, directly outputting the estimated compressive strength result on site.

[0018] 2. This invention realizes the specialization, intelligence and integration of non-destructive testing of the strength of high-replacement-rate recycled concrete, and solves the problems of unsuitability of general equipment and easy error in manual calculation. It has high precision and high efficiency, and strongly supports the quality control of recycled concrete projects. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the intelligent strength measurement system of the present invention; Figure 2 This is a flowchart of the processing steps of the core processing unit of the present invention; Figure 3 This is a flowchart of the algorithm steps for the rebound signal acquisition module of the present invention; Figure 4 This is a flowchart of the algorithm steps of the ultrasonic signal acquisition and processing module of the present invention. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0021] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0022] like Figures 1 to 4 As shown, an intelligent strength measurement system for high-replacement-rate recycled concrete using the ultrasonic rebound combined method includes a host, a rebound signal acquisition module, an ultrasonic signal acquisition and processing module, a human-computer interaction module, and a power supply module. The host, rebound signal acquisition module, ultrasonic signal acquisition and processing module, and human-computer interaction module are connected in sequence, and the power supply module provides power to the host, rebound signal acquisition module, ultrasonic signal acquisition and processing module, and human-computer interaction module respectively.

[0023] Furthermore, the host computer is equipped with a core processing unit and a storage unit; The storage unit pre-stores multiple sets of specialized strength measurement formulas for the ultrasonic rebound comprehensive method for different recycled coarse aggregate replacement rates. The general formula is: In the formula: a is the coefficient of the constant term; b and c are regression constants; f cu,e V is the converted value of compressive strength; V is the ultrasonic velocity value after correction for the test area; R is the rebound coefficient after correction for the test area.

[0024] Furthermore, the rebound signal acquisition module is connected to or integrated with a standard mechanical rebounder to acquire and digitize the impact energy signal of the rebounder or directly read the rebound value and transmit the data to the core processing unit.

[0025] Furthermore, the ultrasonic signal acquisition and processing module is connected to the ultrasonic transducer and is used to emit ultrasonic waves, receive signals, measure sound time, calculate sound velocity, and transmit the sound velocity data to the core processing unit.

[0026] Furthermore, the human-computer interaction module includes an input unit for testing personnel to input or select information on the replacement rate of recycled coarse aggregate in the currently tested recycled concrete component.

[0027] Furthermore, it also includes a report generation module, a positioning module, and a wireless data transmission module. The report generation module is used to integrate the test data and results and automatically generate a structured test report. The report generation module, the positioning module, and the wireless data transmission module are all electrically connected to the host.

[0028] A method for an intelligent strength measurement system using an ultrasonic rebound combined method for high-replacement-rate recycled concrete, comprising the following steps: S1. Receive substitution rate information from the input unit; S2. Based on the substitution rate information, the matching dedicated strength measurement formula is automatically retrieved from the storage unit; S3. Simultaneously receive the rebound value R from the rebound signal acquisition module and the sound velocity value V from the ultrasonic signal acquisition and processing module; S4. Substitute R and V into the dedicated strength measurement formula to calculate and generate the concrete compressive strength conversion value in real time. S5. Output the strength conversion value, raw data and formula information used to the display unit of the human-computer interaction module for display, and can store or transmit them.

[0029] The algorithm steps for the rebound signal acquisition module are as follows: S11. Signal Acquisition and Conversion: A displacement sensor (photoelectric / inductive / accelerometer type) captures the rebound displacement after the impact of the hammer, converting the mechanical signal into a voltage / current signal. The conversion formula is as follows: V out =k s ×Δx+V offset ; V out k is the sensor output voltage. s For sensor sensitivity; V is the rebound displacement of the hammer; offset This is the zero-position offset voltage of the sensor; S12, Analog signal preprocessing; S13, Analog-to-digital conversion: Set the ADC sampling rate, perform discrete sampling on the filtered analog signal, quantize it into a digital signal, and transmit it to the microprocessor; The modular conversion formula is D=round[(V filtered -V min )×2 N-1 / (V max -V min )]; Where D is the digital output value, N is the ADC bit width, and V... min For the minimum input voltage, V max Maximum input voltage; S14, Digital Signal Processing; S15. Data calibration and correction, including angle correction and carbonization depth correction. The angle correction formula is as follows: R a =R+K θ ;where R a K represents the springback value after angle correction. θ This is the angle correction factor; Its carbonization depth correction formula is: f cu =a×R a b ×(10d)c Where f cu is the converted value of concrete compressive strength; a, b, and c are the coefficients of the strength measurement curve; d is the carbonation depth. S16. Data post-processing and output, R m or f cu It can be displayed on an LCD screen, store data in local storage, and be transmitted to mobile terminals / cloud via Bluetooth.

[0030] The algorithm steps of the ultrasonic signal acquisition and processing module are as follows: S21. Ultrasonic signal reception and preamplification: The ultrasonic analog signal is received and amplified concurrently. The signal reception formula is as follows: ,in This is the raw echo signal from the ultrasonic transducer; To amplify the gain, This is the amplified signal; S22, Bandpass filtering for noise reduction; S23, ADC analog-to-digital conversion; S24, Remove DC bias; S25. Ultrasonic envelope extraction, where the extraction formula is: , For Hilbert transform; For the signal envelope; S26, Time-of-Flight (TOF) detection of the first wave arrival time. ; The sampling point for the first peak; The sampling period.

[0031] Compared with the prior art, the present invention has the following advantages: 1. The host storage unit pre-stores dedicated strength testing formulas for different replacement rates of recycled coarse aggregates. During testing, the replacement rate of the object being tested is input through the human-machine interaction module, and the core processing unit automatically calls the corresponding formula and substitutes the collected rebound value and ultrasonic velocity value into the calculation in real time, directly outputting the estimated compressive strength result on site.

[0032] 2. This invention realizes the specialization, intelligence and integration of non-destructive testing of the strength of high-replacement-rate recycled concrete, and solves the problems of unsuitability of general equipment and easy error in manual calculation. It has high precision and high efficiency, and strongly supports the quality control of recycled concrete projects.

[0033] The main unit is handheld or portable. The human-machine interface module includes a touch screen and physical buttons / knobs. The inspector first enters or selects "Recycled aggregate replacement rate: 50%" via the button or touch screen menu.

[0034] Routine rebound tests and ultrasonic tests are performed in the component testing area. The rebound value is transmitted to the host via a connecting cable or wirelessly, and the acoustic time data measured by the ultrasonic probe is calculated into sound velocity internally and then transmitted to the host.

[0035] The core processing unit (such as an embedded processor) immediately calls the corresponding dedicated strength measurement formula from the storage unit (such as a FLASH chip).

[0036] The processor substitutes the received R and V values ​​into the formula in real time, and the calculation results are displayed on the screen almost in real time, and all information of the survey area is automatically stored.

[0037] After all test areas are completed, the device can generate a test report with one click, which includes the intensity value, average value, estimated value and the basis of the curve used for each test area, and can be exported or uploaded via USB or 4G / 5G network.

[0038] Example 1: The test object was a recycled concrete beam component with a 50% replacement rate of recycled coarse aggregate. The high-replacement-rate recycled concrete ultrasonic rebound combined method intelligent strength testing system of this embodiment adopts a handheld main unit structure, with an overall weight of ≤1.2kg, making it easy to carry and operate on site. The specific configuration of each module is as follows: 1. Host The main unit is handheld, measuring 180mm × 100mm × 50mm, and includes a built-in core processing unit and storage unit. Core processing unit: It adopts an STM32H743 embedded processor with a main frequency of 480MHz, supports high-speed data processing, and can realize real-time reception and intensity conversion of rebound value and sound speed value. Storage unit: Uses a 16GB FLASH chip to pre-store multiple sets of ultrasonic rebound comprehensive method strength measurement formulas corresponding to the replacement rate of recycled coarse aggregate (0%, 30%, 50%, 70%, 100%). It also integrates a report generation module, a GPS positioning module, and a 4G wireless transmission module, supporting real-time uploading of detection data to the cloud management platform with a positioning accuracy of ±5m.

[0039] 2. Rebound signal acquisition module Integrated with the ZC3-A standard mechanical rebound hammer, it features a built-in photoelectric displacement sensor. Specific parameters and configuration: Sensor parameters: Sensitivity kJ / m² s =1V / mm, zero-position offset voltage V offset =0.5V, measuring range 0~10mm, accuracy ±0.01mm; Connection method with host: Wireless Bluetooth connection (transmission distance ≤10m), supports real-time synchronous transmission of bounce data; Built-in ADC module: resolution N=12 bits, minimum input voltage V min =0V, maximum input voltage V max =5V, sampling rate 2kHz, meets peak capture requirements.

[0040] 3. Ultrasonic signal acquisition and processing module Connect to a 500kHz piezoelectric ultrasonic transducer (one pair of transmitting probes and one pair of receiving probes). Specific parameters and configuration: The preamplifier gain is 500 times, and the bandpass filter cutoff frequency is 200kHz~500kHz, effectively filtering out environmental electromagnetic interference. ADC Module: Shares host ADC resources with the rebound module, 12-bit resolution, sampling period T s =1μs; Hilbert transform module: integrated into the core processing unit, it can quickly extract the ultrasonic echo envelope, with a first wave arrival time detection accuracy of ±0.1μs.

[0041] 4. Human-Computer Interaction Module It includes a 3.5-inch touchscreen display (800×480 resolution) and three physical buttons (power button, confirmation button, and reset button). The touchscreen display supports Chinese menu operation and can display test data, intensity results, and the intensity measurement formula used in real time. The physical buttons are used for emergency operation and quick parameter adjustment.

[0042] 5. Power Module It uses a 10000mAh rechargeable lithium battery with an output voltage of 5V / 2A, which powers the main unit, rebound module, ultrasonic module, and human-machine interaction module. It can perform continuous testing for ≥8 hours on a single charge, supports USB fast charging, and has overcharge and over-discharge protection functions. The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An intelligent strength measurement system for high-replacement-rate recycled concrete using an ultrasonic rebound combined method, characterized in that... The device includes a host, a rebound signal acquisition module, an ultrasonic signal acquisition and processing module, a human-machine interaction module, and a power supply module. The host, rebound signal acquisition module, ultrasonic signal acquisition and processing module, and human-machine interaction module are connected in sequence. The power supply module provides power to the host, rebound signal acquisition module, ultrasonic signal acquisition and processing module, and human-machine interaction module respectively.

2. The intelligent measurement method of ultrasonic rebound combined with other methods for high-replacement-rate recycled concrete as described in claim 1. A powerful system, characterized by: The host computer is equipped with a core processing unit and a storage unit; The storage unit pre-stores multiple sets of specialized strength measurement formulas for the ultrasonic rebound comprehensive method for different recycled coarse aggregate replacement rates. The general formula is: In the formula: a is the coefficient of the constant term; b and c are regression constants; V is the converted value of compressive strength; V is the ultrasonic velocity value after correction for the test area; R is the rebound coefficient after correction for the test area.

3. The intelligent measurement method of ultrasonic rebound combined with other methods for high-replacement-rate recycled concrete as described in claim 1. A powerful system, characterized by: The rebound signal acquisition module is connected to or integrated with a standard mechanical rebounder to acquire and digitize the impact energy signal of the rebounder or directly read the rebound value and transmit the data to the core processing unit.

4. The intelligent measurement method of ultrasonic rebound combined with other methods for high-replacement-rate recycled concrete as described in claim 1. A powerful system, characterized by: The ultrasonic signal acquisition and processing module is connected to the ultrasonic transducer and is used to emit ultrasonic waves, receive signals, measure sound time, calculate sound velocity, and transmit sound velocity data to the core processing unit.

5. The intelligent measurement method of ultrasonic rebound combined with other methods for high-replacement-rate recycled concrete as described in claim 1. A powerful system, characterized by: The human-computer interaction module includes an input unit for testing personnel to input or select information on the replacement rate of recycled coarse aggregate in the currently tested recycled concrete component.

6. The intelligent measurement method of ultrasonic rebound combined with other methods for high-replacement-rate recycled concrete as described in claim 1. A powerful system, characterized by: It also includes a report generation module, a positioning module, and a wireless data transmission module. The report generation module is used to integrate test data and results and automatically generate a structured test report. The report generation module, positioning module, and wireless data transmission module are all electrically connected to the host.

7. The intelligent measurement method of ultrasonic rebound combined with other methods for high-replacement-rate recycled concrete as described in claim 2. A powerful system, characterized by: The core processing unit's processing steps are as follows: S1. Receive substitution rate information from the input unit; S2. Based on the substitution rate information, automatically retrieve the matching dedicated strength measurement formula from the storage unit; S3. Simultaneously receive the rebound value R from the rebound signal acquisition module and the sound velocity value V from the ultrasonic signal acquisition and processing module; S4. Substitute R and V into the dedicated strength measurement formula to calculate and generate the concrete compressive strength conversion value in real time. S5. Output the strength conversion value, raw data and formula information used to the display unit of the human-computer interaction module for display, and can store or transmit them.

8. The intelligent measurement method of ultrasonic rebound combined with other methods for high-replacement-rate recycled concrete as described in claim 1. A powerful system, characterized by: The algorithm steps of the rebound signal acquisition module are as follows: S11. Signal Acquisition and Conversion: A displacement sensor captures the rebound displacement after the impact of the hammer, converting the mechanical signal into a voltage / current signal. The conversion formula is as follows: ; V out k is the sensor output voltage. s For sensor sensitivity; V is the rebound displacement of the hammer; offset This is the zero-position offset voltage of the sensor; S12, Analog signal preprocessing; S13, Analog-to-digital conversion: Set the ADC sampling rate, perform discrete sampling on the filtered analog signal, quantize it into a digital signal, and transmit it to the microprocessor; The modular conversion formula is D=round[(V filtered -V min )×2 N-1 / (V max -V min )]; Where D is the digital output value, N is the ADC bit width, and V... min For the minimum input voltage, V max Maximum input voltage; S14, Digital Signal Processing; S15. Data calibration and correction, including angle correction and carbonization depth correction. The angle correction formula is as follows: R a =R+K θ ;where R a K represents the springback value after angle correction. θ This is the angle correction factor; Its carbonization depth correction formula is: f cu =a×R a b ×(10d) c ; Where f cu is the converted value of concrete compressive strength; a, b, and c are the coefficients of the strength measurement curve; d is the carbonation depth. S16. Data post-processing and output, R m or f cu It can be displayed on an LCD screen, store data in local storage, and be transmitted to mobile terminals / cloud via Bluetooth.

9. The intelligent strength measurement system for high-replacement-rate recycled concrete using the ultrasonic rebound combined method as described in claim 1, characterized in that: The algorithm steps of the ultrasonic signal acquisition and processing module are as follows: S21. Ultrasonic signal reception and preamplification: The ultrasonic analog signal is received and amplified concurrently. The signal reception formula is as follows: ,in This is the raw echo signal from the ultrasonic transducer; To amplify the gain, This is the amplified signal; S22, Bandpass filtering for noise reduction; S23, ADC analog-to-digital conversion; S24, Remove DC bias; S25. Ultrasonic envelope extraction, where the extraction formula is: , For Hilbert transform; For the signal envelope; S26, Time-of-Flight (TOF) detection of the first wave arrival time. ; These are the sampling points for the first peak. The sampling period.

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