Concrete compressive strength detection method and detection device

Abstract

The invention discloses a concrete compressive strength detection method and a detection device. The method comprises the following steps: taking down a detection sample from the central part and the peripheral corners of a to-be-detected integral concrete block; calculating the compressive strength of each detection sample; a central processing unit of the analysis display device constructs a compressive strength comprehensive analysis detection model, inputs the compressive strength of each detected sample, outputs a comprehensive compressive strength value, compares a qualified threshold value, judges whether the compressive strength of the whole concrete block to be detected is qualified or not, and inputs a result into the analysis display device; the compressive strength comprehensive analysis and detection model is creatively constructed, the compressive strength of each sample in the whole detection piece is input, data integration processing is performed on the compressive strength of each part, and the compressive strength of the whole piece can be more accurately displayed by the output comprehensive compressive strength value; and the overall performance is incorporated into calculation, so that the detection accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete strength detection, and in particular to a concrete compressive strength detection method and detection device. Background Art

[0002] Concrete compressive strength is an important indicator to measure concrete performance, and is of great significance to the design, construction and quality control of concrete structures. At present, the commonly used concrete compressive strength testing methods include rebound method, core drilling method, ultrasonic method, etc.

[0003] However, these methods also have certain limitations. Generally speaking, construction inspection personnel directly judge the overall condition of the current concrete block by testing the compressive strength of concrete samples, ignoring the problem that bubbles or debris may be mixed into the concrete during the overall forming process, resulting in uneven composition of the base material or uneven distribution of admixtures, resulting in uneven strength performance of the material. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the problems existing in the above-mentioned existing concrete strength detection methods, the present invention is proposed.

[0006] Therefore, the technical problem solved by the present invention is to solve the problem that the existing concrete strength detection method ignores the bubbles or debris that may be mixed into the concrete during the overall forming process, resulting in uneven composition of the base material or uneven distribution of admixtures, resulting in inconsistent strength performance of the material.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for testing the compressive strength of concrete, comprising the following testing steps: S1: taking a test sample at the center of the integral concrete block to be tested; S2: calculating the compressive strength of the current test sample, and inputting the result into an analysis and display device;

[0008] S3: Take n edge detection samples evenly from the corners around the center of the whole concrete block to be detected;

[0009] S4: Calculate the compressive strength of the current n edge detection samples, and input the results into the analysis and display device; S5: The central processing unit of the analysis and display device constructs a comprehensive analysis and detection model for compressive strength, inputs the compressive strength of each sample to be detected, outputs a comprehensive compressive value, compares it with the qualified threshold value, determines whether the compressive strength of the overall concrete block to be detected is qualified, and inputs the results into the analysis and display device.

[0010] As a preferred embodiment of the concrete compressive strength testing method of the present invention, when n edge test samples are evenly taken from the four corners around the center of the whole concrete block to be tested, the distances from the four corners to the center are consistent.

[0011] As a preferred solution of the concrete compressive strength detection method described in the present invention, the calculation of the compressive strength of the detection sample specifically includes the following steps: H1: preparing a detection device, including a pressure sensor, a displacement sensor and a data acquisition processor; H2: fixing the detection device on a concrete specimen, and adjusting the device so that it is in close contact with the concrete surface; H3: starting the detection device, and collecting the pressure resistance and displacement data of the concrete specimen in real time through the pressure sensor and the displacement sensor; H4: calculating the concrete compressive strength based on the collected data, and outputting the calculation result to the display device.

[0012] As a preferred solution of the concrete compressive strength detection method of the present invention, the constructed compressive strength comprehensive analysis detection model is specifically:

[0013]

[0014] Among them, μ is the comprehensive compressive strength, α1 is the compressive strength of the test sample taken from the center, and β 1…n is the compressive strength of the test samples taken from the four corners, n is the number of samples taken from the four corners, 1.2, 1.21 and 1.68 are all model adjustment constants.

[0015] As a preferred solution of the concrete compressive strength detection method of the present invention, the qualified threshold is set as:

[0016]

[0017] Among them, μ 合格 is the qualified threshold, α1 is the compressive strength of the test sample taken from the center, β 1…n is the compressive strength of the test samples taken from the four corners, and 1.09 is the model adjustment constant.

[0018] As a preferred solution of the concrete compressive strength detection method of the present invention, when the comprehensive compressive strength value is not lower than the qualified threshold value, the currently detected concrete compressive strength is judged to be qualified.

[0019] In order to solve the above technical problems, the present invention also provides the following technical solutions: a concrete compressive strength detection device, using the above concrete compressive strength detection method, including the following components: a sampling component, taking out each detection sample from the concrete block to be detected according to a preset sampling rule; a detection component, detecting the compressive strength value of each detection sample; a comprehensive analysis component, constructing a compressive strength comprehensive analysis detection model, inputting each compressive strength value, obtaining a comprehensive compressive value, synchronously comparing the qualified threshold value, and analyzing and determining whether the current concrete is qualified; an analysis display device, wirelessly connected to the detection component and the comprehensive analysis component, for displaying the compressive strength value of each detection sample and the analysis and determination results.

[0020] As a preferred solution of the concrete compressive strength detection device described in the present invention, when the comprehensive compressive strength value obtained by the comprehensive analysis component is not lower than the qualified threshold value, it is judged that the currently detected concrete compressive strength is qualified.

[0021] Beneficial effects of the invention: The invention provides a method and a device for detecting the compressive strength of concrete. Compared with the traditional detection means of a single detection sample, the invention creatively constructs a comprehensive analysis and detection model for compressive strength, inputs the compressive strength of each sample in the overall detection part, performs data integration processing on the compressive strength of each part, and the output comprehensive compressive value can more accurately display the compressive strength of the overall part. The accuracy of the detection is improved by incorporating the overall performance into the calculation, and the problem that the existing concrete strength detection method ignores the possible presence of bubbles or debris mixed in during the overall forming process of concrete, resulting in uneven composition of the base material or uneven distribution of admixtures, resulting in non-uniform strength performance of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0023] Figure 1 The present invention provides a method flow chart of the method for detecting the compressive strength of concrete.

[0024] Figure 2 A flow chart of the method for calculating the compressive strength of a test sample provided by the present invention.

[0025] Figure 3 This is a connection diagram of the overall components of the concrete compressive strength testing device provided by the present invention. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0027] The existing method for testing the compressive strength of concrete generally directly judges the overall condition of the current concrete block by testing the compressive strength of the concrete sample, ignoring the problem that bubbles or debris may be mixed into the concrete during the overall forming process, resulting in uneven composition of the base material or uneven distribution of admixtures, resulting in inconsistent strength performance of the material.

[0028] Therefore, see Figure 1 The present invention provides a method for testing the compressive strength of concrete, comprising the following testing steps:

[0029] S1: Take the test sample from the center of the whole concrete block to be tested;

[0030] S2: Calculate the compressive strength of the current test sample and input the result into the analysis and display device;

[0031] S3: Take n edge detection samples evenly from the corners around the center of the whole concrete block to be detected;

[0032] S4: Calculate the compressive strength of the current n edge detection samples and input the results into the analysis and display device;

[0033] S5: The central processor of the analysis and display device constructs a comprehensive analysis and detection model for compressive strength, inputs the compressive strength of each sample to be tested, outputs a comprehensive compressive value, compares it with the qualified threshold value, determines whether the compressive strength of the overall concrete block to be tested is qualified, and inputs the result into the analysis and display device.

[0034] Specifically, when n edge detection samples are evenly taken from the four corners around the center of the whole concrete block to be detected, the distances between the four corners and the center are consistent.

[0035] For further information, see Figure 2 , the calculation of the compressive strength of the test sample specifically includes the following steps:

[0036] H1: Prepare the detection device, including pressure sensor, displacement sensor and data acquisition processor;

[0037] H2: Fix the detection device on the concrete specimen and adjust the device so that it is in close contact with the concrete surface;

[0038] H3: Start the detection device and collect the pressure resistance and displacement data of the concrete specimen in real time through the pressure sensor and displacement sensor;

[0039] H4: Calculate the concrete compressive strength based on the collected data, and output the calculation result to the display device.

[0040] It should be noted that the specific calculation process is as follows:

[0041] Initialize the detection device:

[0042] Ensure that the hardware equipment of the detection device (pressure sensor, displacement sensor, data acquisition processor, display device) has been correctly connected and calibrated.

[0043] Turn on the data acquisition processor and initialize the detection system, including setting the sampling frequency, filtering parameters, trigger threshold, etc.

[0044] Start data collection:

[0045] Install the detection device firmly on the concrete specimen to ensure good contact between the sensor and the specimen surface.

[0046] Start the detection device and begin to automatically collect data from the pressure sensor and displacement sensor.

[0047] The pressure sensor records the force (F, unit: Newton) applied to the concrete specimen in real time.

[0048] The displacement sensor records in real time the displacement (ΔL, unit: mm) of the specimen caused by the applied pressure.

[0049] Data synchronization and recording:

[0050] The data acquisition processor receives pressure and displacement data simultaneously and records them synchronously.

[0051] In order to ensure the accuracy of the data, it is necessary to monitor the data in real time so that the test can be adjusted or stopped in time when an abnormality is found.

[0052] Data processing and calculation:

[0053] When the preset load force or displacement is reached, the data acquisition processor starts to calculate the data.

[0054] Calculate the pressure area (A, unit: square millimeter):

[0055] A=length×width

[0056] For a standard cubic specimen (150 mm × 150 mm × 150 mm), A = 150 mm × 150 mm = 22500 mm 2 .

[0057] Calculate the compressive strength (σ, unit: megapascal, MPa):

[0058] σ = F / (A × 1e-6) (convert area units from square millimeters to square meters)

[0059] During the entire loading process, the above calculation is repeated to obtain a series of compressive strength values.

[0060] Compressive strength value analysis:

[0061] Analyze the compressive strength values ​​during the entire loading process and find the maximum value.

[0062] The maximum compressive strength value usually corresponds to the strength at which the concrete fails.

[0063] Calculate the average compressive strength:

[0064] If no abnormality occurs during the test, the average value of all valid compressive strength values ​​is taken as the final result.

[0065] The average compressive strength (σ_avg) is calculated as:

[0066] σ_avg=(Σσ_i) / n

[0067] Among them, Σσ_i is the sum of all valid compressive strength values, and n is the number of valid tests.

[0068] Output:

[0069] The calculated average compressive strength value is output to a display device.

[0070] Example calculation:

[0071] Assume that during the test, the maximum resistance pressure recorded by the pressure sensor is 300000N (300kN) and the pressure area is 22500mm 2 , the maximum compressive strength is calculated as follows:

[0072] σ_max=300000N / (22500mm 2 ×1e-6m 2 / mm 2 )=13.33MPa

[0073] Assuming that the number of effective tests is 10 and the total compressive strength is 130 MPa, the average compressive strength is:

[0074] σ_avg=130MPa / 10=13MPa.

[0075] It is also important to note that the preset load or displacement depends on the size, shape, strength grade and test standard of the concrete specimen. Different countries and regions may have different test standards, but the following are some common preset values:

[0076] Preset load force:

[0077] For standard cubic specimens (e.g. 150mm x 150mm x 150mm), the load is usually preset based on the expected strength grade of the concrete. For example, for C30 grade concrete, the expected cubic compressive strength is about 30MPa. If the compressive area of ​​the specimen is 22500mm 2 , then the loading force can be preset as:

[0078] F=σ×A

[0079] F=30MPa×22500mm 2 ×1e-6m 2 / mm 2

[0080] F=675kN

[0081] In actual testing, the load force is usually higher than the force corresponding to the expected strength to prevent the test from being terminated before the target strength is reached. Therefore, the preset load force may be set at 1000kN or higher.

[0082] Preset displacement:

[0083] The preset displacement value is usually small, because the displacement of concrete before failure is usually not large. For a cubic specimen, the preset displacement value may be 0.01 mm to 0.05 mm, which is equivalent to a strain (strain = displacement / length) of the specimen between 0.001% and 0.003%.

[0084] The preset value of the displacement can also be based on the expected deformation capacity of the concrete. For example, if the expected deformation is 0.02%, for a 150mm high cube specimen, the preset displacement value is:

[0085] ΔL=150mm×0.0002=0.03mm

[0086] In actual testing, the preset load force or displacement value should be determined based on the following factors:

[0087] Design strength and expected performance of concrete.

[0088] Size and shape of the test piece.

[0089] Requirements of international or national standards (such as ISO, ASTM, EN, etc.).

[0090] Specifications and capabilities of testing machines and instruments.

[0091] Typically, these preset values ​​are specified in the test plan before testing, and during the test, the operator sets the data acquisition processor according to these preset values ​​to ensure that the compressive strength calculation begins when the preset load or displacement is reached.

[0092] Furthermore, the constructed compressive strength comprehensive analysis and detection model is as follows:

[0093]

[0094] Among them, μ is the comprehensive compressive strength, α1 is the compressive strength of the test sample taken from the center, and β 1…n is the compressive strength of the test samples taken from the four corners, n is the number of samples taken from the four corners, 1.2, 1.21 and 1.68 are all model adjustment constants.

[0095] Furthermore, the qualified threshold is set as:

[0096]

[0097] Among them, μ 合格 is the qualified threshold, α1 is the compressive strength of the test sample taken from the center, β 1…n is the compressive strength of the test samples taken from the four corners, and 1.09 is the model adjustment constant.

[0098] Specifically, when the comprehensive compressive strength value is not lower than the qualified threshold, it is judged that the compressive strength of the concrete currently tested is qualified.

[0099] For additional information, see Figure 3 The present invention also provides a concrete compressive strength detection device, which uses the above concrete compressive strength detection method and includes the following components:

[0100] The sampling component 100 takes out each test sample from the concrete block to be tested according to a preset sampling rule;

[0101] A testing component 200 is used to test the compressive strength value of each test sample;

[0102] The comprehensive analysis component 300 constructs a comprehensive analysis and detection model for compressive strength, inputs various compressive strength values, obtains a comprehensive compressive value, and simultaneously compares the qualified threshold value to analyze and determine whether the current concrete is qualified;

[0103] The analysis and display device 400 is wirelessly connected to the detection component 200 and the comprehensive analysis component 300, and is used to display the compressive strength value and analysis and determination results of each detection sample.

[0104] Further, when the comprehensive compressive strength value obtained by the comprehensive analysis component 300 is not lower than the qualified threshold value, it is determined that the currently detected concrete compressive strength is qualified.

[0105] In order to verify the technical effect of the present invention, the following simulation test is now given:

[0106] Prepare test materials:

[0107] Prepare a batch of concrete and ensure that its mix proportion and uniformity meet the test requirements.

[0108] A number of concrete cube specimens were made, each with a size of 150 mm × 150 mm × 150 mm.

[0109] Grouping:

[0110] The specimens were divided into two groups, one was the traditional single test sample group (control group), and the other was the comprehensive analysis test model group (experimental group).

[0111] Traditional single test sample group (control group):

[0112] A single specimen is randomly selected from the control group and tested for compressive strength using conventional methods (such as the core drilling method or the rebound method).

[0113] Comprehensive analysis and detection model group (experimental group):

[0114] The detection device of the present invention is used to perform compressive strength detection on each test piece in the test group.

[0115] The compressive strength data of each specimen is recorded and input into the comprehensive analysis and detection model.

[0116] The model integrates the compressive strength data of each specimen and outputs the compressive strength value of the entire specimen.

[0117] Test process:

[0118] Control group test:

[0119] Each specimen in the control group was tested using the traditional method and the compressive strength value was recorded.

[0120] Test group test:

[0121] Using the detection device of the present invention to detect each test piece in the test group includes:

[0122] a. Install the detection device and calibrate it.

[0123] b. Start the detection device to collect pressure resistance and displacement data in real time.

[0124] c. Calculate the compressive strength of each specimen.

[0125] d. Input the compressive strength data of each specimen into the comprehensive analysis and detection model.

[0126] After the model integrates the processed data, it outputs the compressive strength value of the entire component.

[0127] Test data table:

[0128] Table 1 below is an example table of test data, including the compressive strength test results of the control group and the test group.

[0129] Table 1: Data of control experimental group

[0130]

[0131]

[0132] Analysis of test results:

[0133] It can be seen from the table that the average compressive strength value of the test group is closer to the average value of the integral piece, indicating that the comprehensive analysis and detection model can more accurately reflect the compressive strength of the integral concrete piece.

[0134] The compressive strength values ​​of the control group fluctuated greatly and had a high standard deviation, indicating that the method of testing a single sample may not fully reflect the strength uniformity of the entire piece.

[0135] The standard deviation of the compressive strength values ​​of the test group was low, indicating that the detection method of the present invention can provide more consistent and reliable detection results.

[0136] Through the above-mentioned test verification process, the concrete compressive strength detection method and detection device provided by the present invention have demonstrated their superiority, can more accurately evaluate the compressive strength of the entire concrete piece, and solve the problems existing in the traditional method in concrete strength detection.

[0137] The present invention provides a method and a device for detecting the compressive strength of concrete. Compared with the traditional detection means of a single detection sample, the present invention creatively constructs a comprehensive analysis detection model for compressive strength, inputs the compressive strength of each sample in the overall detection part, performs data integration processing on the compressive strength of each part, and the output comprehensive compressive value can more accurately display the compressive strength of the overall part. The accuracy of the detection is improved by incorporating the overall performance into the calculation, and the problem that the existing concrete strength detection method ignores the possible presence of bubbles or debris mixed in during the overall molding process of concrete, resulting in uneven composition of base materials or uneven distribution of admixtures, resulting in non-uniform strength performance of the materials.

[0138] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for testing the compressive strength of concrete, characterized in that: The detection steps include the following: S1: Take the test sample from the center of the whole concrete block to be tested; S2: Calculate the compressive strength of the current test sample and input the result into the analysis and display device; S3: Take n edge detection samples evenly from the corners around the center of the whole concrete block to be detected; S4: Calculate the compressive strength of the current n edge detection samples and input the results into the analysis and display device; S5: The central processor of the analysis and display device constructs a comprehensive analysis and detection model for compressive strength, inputs the compressive strength of each sample to be tested, outputs a comprehensive compressive value, compares it with the qualified threshold value, determines whether the compressive strength of the overall concrete block to be tested is qualified, and inputs the result into the analysis and display device.

2. The method for testing the compressive strength of concrete according to claim 1, characterized in that: When n edge detection samples are evenly taken from the four corners around the center of the whole concrete block to be detected, the distances between the four corners and the center are consistent.

3. The method for testing the compressive strength of concrete according to claim 2, characterized in that: The calculation of the compressive strength of the test sample specifically includes the following steps: H1: Prepare the detection device, including pressure sensor, displacement sensor and data acquisition processor; H2: Fix the detection device on the concrete specimen and adjust the device so that it is in close contact with the concrete surface; H3: Start the detection device and collect the pressure resistance and displacement data of the concrete specimen in real time through the pressure sensor and displacement sensor; H4: Calculate the concrete compressive strength based on the collected data, and output the calculation result to the display device.

4. The method for testing the compressive strength of concrete according to claim 3, characterized in that: The constructed compressive strength comprehensive analysis and detection model is specifically: Among them, μ is the comprehensive compressive strength, α1 is the compressive strength of the test sample taken from the center, and β 1…n is the compressive strength of the test samples taken from the four corners, n is the number of samples taken from the four corners, 1.2, 1.21 and 1.68 are all model adjustment constants.

5. The method for testing the compressive strength of concrete according to claim 4, characterized in that: The qualified threshold is set as: Among them, μ 合格 is the qualified threshold, α1 is the compressive strength of the test sample taken from the center, β 1…n is the compressive strength of the test samples taken from the four corners, and 1.09 is the model adjustment constant.

6. The method for testing the compressive strength of concrete according to claim 5, characterized in that: When the comprehensive compressive strength value is not lower than the qualified threshold value, it is judged that the currently tested concrete compressive strength is qualified.

7. A concrete compressive strength testing device, using the concrete compressive strength testing method according to any one of claims 1 to 6, characterized in that: Includes the following components: A sampling component (100) is used to take out various test samples from the concrete block to be tested according to a preset sampling rule; A testing component (200) is used to test the compressive strength value of each test sample; A comprehensive analysis component (300) constructs a comprehensive analysis and detection model for compressive strength, inputs various compressive strength values, obtains a comprehensive compressive value, and simultaneously compares the qualified threshold value to analyze and determine whether the current concrete is qualified; The analysis and display device (400) is wirelessly connected to the detection component (200) and the comprehensive analysis component (300) and is used to display the compressive strength value and analysis and determination results of each detection sample.

8. The concrete compressive strength testing device according to claim 7, characterized in that: When the comprehensive compressive strength value obtained by the comprehensive analysis component (300) is not lower than the qualified threshold value, it is judged that the currently detected concrete compressive strength is qualified.

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