Full-life-cycle nondestructive testing method for compressive strength of sluice channel concrete

Abstract

The invention relates to the technical field of hydraulic concrete durability testing, and discloses a full-life-cycle nondestructive testing method for the compressive strength of drainage channel concrete. The compressive strength in the concrete is effectively judged through surface data of the drainage channel, the purpose of nondestructive testing can be achieved, the surface structure of the concrete of the drainage channel can be prevented from being damaged, the concrete of the drainage channel is prevented from being damaged by coring, and more serious impact abrasion is avoided; meanwhile, based on comparative analysis of multiple scanning data, tiny changes of the concrete surface can be accurately recognized, potential damage areas can be found in time, and the detection precision and reliability are improved.

Description

Technical Field

[0001] This application relates to the field of hydraulic concrete technology, for example to a method for non-destructive testing of the compressive strength of drainage channel concrete throughout its entire life cycle. Background Technology

[0002] Due to the erosion caused by water flow, concrete wear is a common phenomenon in hydraulic spillway structures. To ensure the safe operation of the project, it is necessary to test the concrete performance of the spillway during operation to provide a basis for repair measures. Concrete compressive strength, as a core indicator for evaluating material durability and structural stability, is a key component of strength testing.

[0003] Currently, the mainstream methods for testing the compressive strength of concrete include core drilling and rebound hammer testing. Core drilling, by drilling a core sample from the concrete structure and testing its compressive strength, offers high accuracy. However, this method disrupts the original structural integrity of the concrete, creating voids on the surface of the drainage channel. These voids not only weaken local structural strength but also become vulnerable areas for water flow impact, exacerbating cavitation erosion and abrasion damage, creating a vicious cycle of "testing exacerbates damage." Therefore, it is particularly unsuitable for drainage channels subjected to long-term water flow. Rebound hammer testing, by measuring the surface hardness of the concrete and estimating compressive strength based on the hardness-strength conversion relationship, offers the advantages of being non-destructive and efficient. However, after being washed by water, the surface of the drainage channel concrete easily becomes rough and uneven, even exhibiting aggregate exposure and surface peeling. This results in insufficient contact between the rebound hammer probe and the concrete, significantly increasing the dispersion of the test data, and the error is insufficient to meet the requirements for accurate testing of the compressive strength of drainage channels.

[0004] In summary, while core drilling offers high precision, its destructive nature to the concrete structure makes the sampling site susceptible to severe cavitation erosion. Although rebound hammer testing is non-destructive, its accuracy is significantly affected by surface condition; the worn surface of the drainage channel concrete will lead to significant deviations in the test results. Therefore, achieving high-precision, full-life-cycle non-destructive testing of the compressive strength of drainage channels while ensuring the integrity of the concrete structure has become a pressing technical problem for those skilled in the art.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0007] This disclosure provides a method for non-destructive testing of the compressive strength of concrete in drainage channels throughout their entire life cycle, in order to solve the problem of how to achieve high-precision, full-life-cycle non-destructive testing of the compressive strength of drainage channels while ensuring the integrity of the concrete structure.

[0008] In some embodiments, the method for non-destructive testing of the compressive strength of concrete in drainage channels throughout their entire life cycle includes:

[0009] S1, Prepare concrete specimens with the same mix proportions as the spillway concrete;

[0010] S2, conduct impact and abrasion tests on concrete specimens, and test the impact and abrasion strength and compressive strength after the test to obtain the relationship curve between impact and abrasion strength and compressive strength;

[0011] S3, acquire data on the concrete surface of the drainage channel;

[0012] S4. Calculate the abrasion resistance of the concrete in the drainage channel based on the obtained surface data of the drainage channel.

[0013] S5. Based on the erosion resistance strength of the spillway concrete and the relationship curve between erosion resistance strength and compressive strength, the compressive strength of the spillway concrete is obtained.

[0014] S6. Based on the compressive strength of the concrete in the drainage channel, determine whether the current concrete structure of the drainage channel meets the operational requirements.

[0015] Optionally, in S2, an impact abrasion test is performed on the concrete specimens. After the test, the impact abrasion strength and compressive strength are measured, and the relationship curve between the impact abrasion strength and compressive strength is obtained, including:

[0016] Core samples were taken from the blasted concrete specimens, and the compressive strength of the cubic core samples was tested to determine the compressive strength of the blasted concrete.

[0017] The impact resistance strength of concrete specimens is directly measured based on impact abrasion tests.

[0018] Using the abrasion resistance of concrete as the abscissa and the compressive strength as the ordinate, a scatter plot is formed. The scatter plots are then fitted into a curve to obtain the abrasion resistance-compressive strength relationship curve.

[0019] Optionally, S1, preparing concrete specimens with the same mix proportions as the spillway concrete includes:

[0020] Multiple cylindrical specimens with a diameter of 300 mm and a height of 100 mm, three 150 mm cubic specimens, and three 70 mm cubic specimens were prepared using concrete with the same mix proportions as the drainage channel concrete, and were placed in a standard concrete curing box for 28 days.

[0021] Optionally, S1, after preparing concrete specimens with the same mix proportions as the spillway concrete, the process further includes:

[0022] Establish the conversion relationship of compressive strength between specimens of different sizes.

[0023] Optionally, the compressive strength of the cubic specimen is tested, and the average value of the test results of three specimens of the same size is taken as the measured value of the compressive strength of the specimen of that size. Based on the measured values ​​of the compressive strength of specimens of different sizes, a conversion relationship of compressive strength between specimens of different sizes is established.

[0024] Optionally, core samples are taken from the impacted concrete specimens, and the compressive strength of the cubic core samples is tested. The compressive strength of the impacted concrete includes:

[0025] The compressive strength of the cubic core sample was tested and converted to the standard cubic compressive strength according to the compressive strength conversion relationship. The average value of the result was taken as the compressive strength of the concrete after grinding.

[0026] Optionally, the abrasion resistance strength of the spillway concrete is calculated based on the obtained surface data of the spillway, including:

[0027] The three-dimensional coordinate data of the concrete surface of the drainage channel were obtained, and the difference between the three-dimensional coordinate data of the surface in two scans was calculated. Then, the difference in concrete volume Δv between the two scans was obtained. Δv is the volume of the detached concrete. The impact and abrasion resistance of the drainage channel concrete was calculated based on Δv.

[0028] Optionally, the erosion resistance of the concrete in the drainage channel is calculated using the following formula:

[0029]

[0030] In the formula: f a ρ represents the abrasion resistance strength of concrete, expressed in h / (kg / m²); t represents the abrasion time, expressed in h; A represents the abrasion area, expressed in m²; ρ represents the density of the drainage channel concrete, expressed in kg / m³. 3 Δv is the volume of the detached concrete, in meters. 3 .

[0031] Optionally, when the drainage channel is completed, a 3D laser scanner is used to scan the surface of the drainage channel to obtain the 3D coordinate data of the concrete surface of the drainage channel. After the drainage channel has been running for a first set time, the surface of the drainage channel is scanned again to obtain the 3D coordinate data of the surface. The first set time is greater than or equal to 24 hours and less than or equal to 72 hours.

[0032] Optionally, S6, based on the compressive strength of the spillway concrete, determine whether the current spillway concrete structure meets operational requirements, including:

[0033] If the system fails to meet operational requirements, repair it promptly.

[0034] If the operation requirements are met, or after the drainage channel is repaired, repeat steps S3 to S6.

[0035] The non-destructive testing method for the compressive strength of drainage channel concrete throughout its entire life cycle, provided in this embodiment, can achieve the following technical effects:

[0036] By using surface data of the drainage channel, the internal compressive strength of the concrete can be effectively determined, achieving the purpose of non-destructive testing. This prevents damage to the concrete surface structure of the drainage channel, avoids the damage caused by core sampling, and avoids more severe abrasion. At the same time, based on the comparative analysis of multiple scan data, it can accurately identify minute changes in the concrete surface, promptly detect potential damage areas, and improve the accuracy and reliability of the test. Furthermore, with multiple tests, the trend of changes in the compressive strength of the drainage channel concrete can be predicted, so that measures can be taken in advance to reduce losses. The test method is low-cost, highly accurate, and can increase the testing frequency for better monitoring of the safety of the drainage channel.

[0037] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0038] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0039] Figure 1 This is a schematic diagram of a non-destructive testing method for the compressive strength of concrete in a drainage channel throughout its entire life cycle, provided in an embodiment of this disclosure.

[0040] Figure 2 This is a schematic diagram of the core sampling location for concrete specimens provided in the embodiments of this disclosure;

[0041] Figure 3 This is a schematic diagram of the impact and abrasion resistance-compressive strength relationship curve provided in the embodiments of this disclosure. Detailed Implementation

[0042] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0043] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0044] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0045] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0046] Unless otherwise stated, the term "multiple" means two or more.

[0047] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0048] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0049] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0050] Combination Figure 1 As shown in the embodiments of this disclosure, a method for non-destructive testing of the compressive strength of concrete in drainage channels throughout their entire life cycle is provided, including:

[0051] S1, Prepare concrete specimens with the same mix proportions as the spillway concrete;

[0052] S2, conduct impact and abrasion tests on concrete specimens, and test the impact and abrasion strength and compressive strength after the test to obtain the relationship curve between impact and abrasion strength and compressive strength;

[0053] S3, acquire data on the concrete surface of the drainage channel;

[0054] S4. Calculate the abrasion resistance of the concrete in the drainage channel based on the obtained surface data of the drainage channel.

[0055] S5. Based on the erosion resistance strength of the spillway concrete and the relationship curve between erosion resistance strength and compressive strength, the compressive strength of the spillway concrete is obtained.

[0056] S6. Based on the compressive strength of the concrete in the drainage channel, determine whether the current concrete structure of the drainage channel meets the operational requirements.

[0057] The non-destructive testing method for the compressive strength of drainage channel concrete throughout its entire life cycle, as provided in this embodiment, effectively determines the internal compressive strength of the concrete by analyzing surface data of the drainage channel. This achieves the purpose of non-destructive testing, preventing damage to the surface structure of the drainage channel concrete, avoiding the damage caused by core sampling, and preventing more severe abrasion. Simultaneously, based on comparative analysis of multiple scan data, it can accurately identify minute changes on the concrete surface, promptly detect potential damage areas, and improve testing accuracy and reliability. Furthermore, with multiple tests, it can predict the changing trend of the compressive strength of the drainage channel concrete, allowing for early intervention to reduce losses. The testing method is low-cost, highly accurate, and can increase the testing frequency, enabling better monitoring of the safety of drainage channels.

[0058] Optionally, in S2, an impact abrasion test is performed on the concrete specimens. After the test, the impact abrasion strength and compressive strength are measured, and the relationship curve between the impact abrasion strength and compressive strength is obtained, including:

[0059] Core samples were taken from the blasted concrete specimens, and the compressive strength of the cubic core samples was tested to determine the compressive strength of the blasted concrete.

[0060] The impact resistance strength of concrete specimens is directly measured based on impact abrasion tests.

[0061] A scatter plot was created using concrete's abrasion resistance as the x-axis and compressive strength as the y-axis. The scatter points were then fitted to a curve, yielding the abrasion resistance-compressive strength relationship curve. By core sampling and compressive strength testing of abrasion-resistant concrete specimens, combined with the directly measured abrasion resistance, a quantitative relationship between the two was established. This ensured the accuracy and representativeness of the curve fitting, providing a reliable basis for subsequent non-destructive testing. This relationship curve allows the abrasion resistance data of the drainage channel concrete surface obtained on-site to be converted into corresponding compressive strength values, enabling non-destructive assessment of the structure's internal mechanical properties. Furthermore, by combining regularly collected surface data from multiple time periods, a compressive strength evolution model can be constructed to dynamically predict the trend of concrete performance degradation, further enhancing the scientific rigor and foresight of maintenance decisions.

[0062] Optionally, S1, preparing concrete specimens with the same mix proportions as the spillway concrete includes:

[0063] Multiple cylindrical specimens (300 mm in diameter and 100 mm in height), three 150 mm cube specimens, and three 70 mm cube specimens were prepared using concrete with the same mix proportions as the spillway concrete. These specimens were then cured in a standard concrete curing chamber for 28 days. This ensured that the strength development of the specimens was consistent with the actual structure, providing a representative sample basis for subsequent impact abrasion tests and strength relationship modeling. After curing, the cylindrical specimens were used for impact abrasion tests simulating the surface abrasion environment of the spillway, while the 150 mm and 70 mm cube specimens were used for compressive strength tests. This verified the strength conversion relationship between specimens of different sizes. Standardized curing conditions eliminated the influence of material variations on the test results, ensuring the reliability and comparability of the compressive strength data and providing an accurate basis for establishing the functional relationship between impact abrasion strength and compressive strength.

[0064] Optionally, the specific method for obtaining the impact abrasion strength of the specimen is as follows: The cylindrical concrete specimen from step S1 is immersed in water for 48 hours, then removed, dried, and weighed; the mass of a single specimen is m0. The cylindrical concrete specimens are then placed in an impact abrasion testing apparatus for impact abrasion tests, with abrasion durations of 24 hours, 48 ​​hours, 72 hours, 96 hours, 120 hours, and 144 hours, with three specimens per group. The abraded concrete specimens are then removed, dried, and weighed; the mass after abrasion is m0. t Calculate the impact and abrasion resistance using the following formula:

[0065]

[0066] In the formula: f a t represents the abrasion resistance strength of concrete, expressed in h / (kg / m²); t represents the abrasion time, expressed in h; A represents the abrasion area, expressed in m²; m0 represents the mass of a single specimen before abrasion, expressed in kg; mt The mass of a single specimen after t hours of grinding is expressed in kg.

[0067] Optionally, S1, after preparing concrete specimens with the same mix proportions as the spillway concrete, the process further includes:

[0068] A conversion relationship for compressive strength between specimens of different sizes was established. By comparing the compressive strength test results of 150mm and 70mm cubic specimens, a size effect correction coefficient was fitted to establish the conversion relationship for compressive strength between specimens of different sizes. This ensures that the test data of small-sized core samples can be accurately equivalent to the strength values ​​of standard specimens, thereby improving the reliability and consistency of field test data. This facilitates the accurate estimation of the compressive strength of the concrete structure of the drainage channel based on the results obtained from the impact test, providing standardized support for subsequent non-destructive testing and durability assessment.

[0069] Optionally, the compressive strength of the cubic specimen is tested, and the average value of the test results of three specimens of the same size is taken as the measured compressive strength value of that size specimen. A conversion relationship for compressive strength between specimens of different sizes is established based on the measured compressive strength values ​​of specimens of different sizes. This method of averaging reduces the random error of a single sample, improves the statistical representativeness of the data, and ensures the accuracy and robustness of the conversion relationship model. A strength conversion coefficient between 150mm and 70mm cubic specimens is determined, so that the compressive strength of small-sized core samples taken from the field can be accurately equivalent to the strength value of standard specimens, providing a reliable basis for subsequent evaluation of the overall structural strength based on local core sampling or non-destructive testing methods.

[0070] Optionally, core samples are taken from the impacted concrete specimens, and the compressive strength of the cubic core samples is tested. The compressive strength of the impacted concrete includes:

[0071] The compressive strength of the cubic core samples was tested and converted to the standard cubic compressive strength using a conversion relationship. The average value of the results was then used as the compressive strength of the concrete after grinding. In this way, the measured strength of the core samples after grinding is uniformly converted to the strength value of the standard specimen through the established size conversion relationship, eliminating the deviation caused by the size effect and ensuring the comparability of the strength data before and after grinding.

[0072] Optionally, the standard cube compressive strength refers to the compressive strength value of a 150mm side-length concrete cube specimen cured for 28 days under standard curing conditions, measured according to standard test methods. This value serves as the basis for determining the concrete strength grade. By using the compressive strength of the 150mm cube specimen as a benchmark, the strength evaluation standards for various specimens are unified, ensuring that the test data are consistent with the actual strength determination system in engineering projects.

[0073] Optionally, the abrasion resistance strength of the spillway concrete is calculated based on the obtained surface data of the spillway, including:

[0074] The three-dimensional coordinate data of the concrete surface of the drainage channel were acquired, and the difference between the three-dimensional coordinate data of the surface in two scans was calculated. This difference, Δv, represents the volume of concrete that detached during the two scans. The abrasion resistance of the drainage channel concrete was then calculated based on Δv. In this way, the changes in the surface morphology of the concrete before and after abrasion are accurately obtained through three-dimensional scanning technology. The cumulative erosion volume Δv is calculated using the point cloud data difference method, making it easier to calculate the abrasion resistance index of the drainage channel concrete based on Δv.

[0075] Optionally, before scanning the three-dimensional coordinate data of the concrete surface of the drainage channel, the surface of the drainage channel should be cleaned to remove dust, oil, and loose deposits, ensuring that the data acquired by the scanner accurately reflects the morphology of the concrete surface. Cleaning should preferably be done using a high-pressure water gun or compressed air in conjunction with a soft brush, avoiding mechanical grinding methods that may damage the surface. During scanning, stable ambient light and no strong winds should be ensured to improve data accuracy. The scanning equipment should be calibrated regularly to ensure that the measurement accuracy meets millimeter-level requirements.

[0076] Optionally, the erosion resistance of the concrete in the drainage channel is calculated using the following formula:

[0077]

[0078] In the formula: f a t represents the abrasion resistance strength of concrete, in h / (kg / m²); t represents the abrasion time, in h; A represents the abrasion area, in m²; ρ represents the density of the drainage channel concrete, in kg / m³. 3 Δv is the volume of the detached concrete, in meters. 3 The "impact area A" is obtained through surface area calculation using 3D scanning data, and the "concrete density ρ" is obtained through specimen density testing (e.g., the drainage method). By substituting the measured detachment volume Δv into the formula, and combining it with the impact time t, impact area A, and concrete density ρ, the concrete's impact resistance strength f can be calculated. a This method quantifies the ability of concrete per unit area and unit mass to resist the impact and abrasion of sand carried by water flow, comprehensively reflecting the material's durability and surface stability. It facilitates comparative analysis of the erosion and abrasion resistance of concrete under different mix proportions or curing conditions, providing a reliable basis for the selection of materials and life assessment of drainage channel structures. The concrete density ρ is taken as 2400 kg / m³. 3 According to the "Standard value of apparent density of ordinary hydraulic concrete" (2350~2450kg / m³) in the "Test Procedure for Hydraulic Concrete" (SL352), 3 In this embodiment, the intermediate value of 2400 kg / m³ is used.3 Alternatively, the density ρ can be set according to the actual concrete used.

[0079] Optionally, upon completion of the spillway, a 3D laser scanner is used to scan the surface of the spillway to obtain 3D coordinate data of the concrete surface. After the spillway has been running for a first set time, the surface is scanned again to obtain 3D coordinate data. The first set time is greater than or equal to 24 hours and less than or equal to 72 hours. Setting the first set time to between 24 and 72 hours ensures that the water flow causes detectable micro-abrasion of the concrete (avoiding calculation errors due to excessively small Δv), while preventing excessive abrasion from exacerbating structural damage.

[0080] Optionally, the scanned 3D coordinate data includes:

[0081] Point cloud registration: The ICP (Iterative Closest Point) algorithm was used to register the data from two scans, with a root mean square error (RMSE) ≤ 0.3 mm.

[0082] Noise filtering: Outliers are removed by radius filtering (points with a search radius of 0.5mm and a neighborhood of less than 5 are considered noise);

[0083] Volume difference calculation: A three-dimensional mesh Boolean operation difference method is used to spatially superimpose the surface models from the two scans and calculate the erosion volume Δv at the intersection, with the error controlled within ±0.001m±. In this way, by clearly defining the data processing standard, ambiguity in calculating the volume difference can be eliminated, ensuring that the accuracy of Δv meets the detection requirements for micro-abrasion (e.g., 0.1mm level).

[0084] Optionally, the initial scan upon completion should be conducted only if it is confirmed that the concrete of the drainage channel has reached its design strength (e.g., after 28 days of curing) and that there are no construction residues on the surface (e.g., formwork marks, laitance), ensuring the accuracy of the baseline data. This ensures that the starting point for subsequent comparative analysis truly reflects the surface morphology and performance of the concrete under design conditions.

[0085] Optionally, S6, based on the compressive strength of the spillway concrete, determine whether the current spillway concrete structure meets operational requirements, including:

[0086] If the system fails to meet operational requirements, repair it promptly.

[0087] If the operation requirements are met, or after the drainage channel has been repaired, repeat steps S3 to S6. In this way, the structural performance changes of the drainage channel can be continuously monitored throughout its entire service life, and the decline trend of the concrete's impact and abrasion resistance and compressive strength can be dynamically assessed.

[0088] Optionally, determining whether the current concrete structure of the spillway meets the operational requirements means setting a compressive strength threshold based on a clearly referenced engineering standard (such as the "Code for Design of Concrete Structures of Water Conservancy and Hydropower Projects" SL191). For example, the standard compressive strength of concrete is 34.5 MPa, and it is determined that the requirements are met when the calculated strength is ≥34.5 MPa.

[0089] Optionally, the compressive strength threshold can also be set manually, for example, to 36 MPa. This allows for flexible adjustment of the judgment criteria based on actual engineering needs and safety margins, ensuring that the assessment results meet both specification requirements and are suitable for specific working conditions.

[0090] Optionally, the "repeated steps S3-S6" can be periodically set. Based on the operating frequency of the spillway (e.g., once a month during the flood season and once a quarter during the non-flood season), the test is performed every set time to avoid wasting time on repeated tests in a short period of time, maintain a reasonable testing frequency, and predict the trend of intensity change through multiple test data (e.g., linear regression analysis to provide early warning of the risk of intensity decline).

[0091] The entire life cycle refers to the entire process from the completion and commissioning of the spillway to its decommissioning or scrapping. This method achieves continuous monitoring of the concrete compressive strength during this process through periodic repeated testing.

[0092] In some specific embodiments,

[0093] In S1, multiple cylindrical specimens with a diameter of 300 mm and a height of 100 mm, three 150 mm cubic specimens, and three 70 mm cubic specimens were prepared using the same raw materials as the concrete mix of the drainage channel. They were then placed in a standard concrete curing box for 28 days. The concrete mix proportions are shown in Table 1.

[0094] Table 1 Concrete Mix Proportions

[0095]

[0096]

[0097] Establishing the compressive strength conversion relationship: The compressive strength of the 150mm cube and 70mm cube specimens in test step S1 was determined using a universal compression testing machine with a loading rate of 0.3MPa / s. The compressive strength results are shown in Table 2. The average compressive strength f of the 150mm cube is... 150 = 39.04 MPa, average compressive strength f of a 70 mm cube 70 = 57.69 MPa, the conversion relationship is f 150 =f 70 ×0.677;

[0098] Table 2 Compressive Strength of Cubes

[0099]

[0100] In S2, the impact abrasion resistance of concrete specimens is tested. Cylindrical specimens are immersed in water for 48 hours, then removed, dried, and weighed (recorded as m0). The cylinders are then placed in an underwater steel ball impact abrasion tester and abraded for 24 hours, 48 ​​hours, 72 hours, 96 hours, 120 hours, and 144 hours respectively. After removal, the specimens are rinsed clean, dried, weighed, and recorded as m. t The impact and abrasion resistance was calculated, and the results are shown in Table 3.

[0101] Table 3 Impact and abrasion resistance

[0102]

[0103]

[0104] In S2, the relationship between impact resistance strength and compressive strength is established: core samples are taken from the concrete specimens after impact, and five 70mm cube core samples are taken from each specimen (e.g., Figure 2 As shown in Table 4, the compressive strength of the cubic core sample was tested. Based on the above compressive strength conversion, the compressive strength of the cubic core sample was converted into the standard cubic compressive strength. The average value of the result was taken as the compressive strength of the concrete after grinding.

[0105] Table 4 Compressive strength of concrete after impact grinding

[0106] Grinding time t (h) Compressive strength (MPa) of a 70mm cube Standard cube compressive strength (MPa) 24 57.75 39.10 48 57.35 38.83 72 57.04 38.62 96 55.79 37.77 120 54.33 36.78 144 53.67 36.33

[0107] A scatter plot was created with the abrasion resistance of concrete on the x-axis and the compressive strength on the y-axis. The scatter points were then fitted to a curve to obtain the abrasion resistance-compressive strength relationship curve, as shown below. Figure 3 As shown;

[0108] In S3, acquiring concrete surface data of the spillway refers to using 3D scanning technology to quickly and accurately obtain 3D coordinate data of the concrete surface of the spillway. The 3D laser scanner model (such as Faro Focus S70), scanning accuracy (coordinate resolution ≤ 0.1mm), and scanning range cover the entire surface of the spillway to avoid blind spots. When the spillway is completed, the 3D laser scanner is used to scan the surface of the spillway to obtain the 3D coordinate data of the concrete surface of the spillway. After the spillway has been running for 48 hours, the surface of the spillway is scanned again to obtain the surface 3D coordinate data.

[0109] In S4, the calculation of the erosion resistance of the concrete in the drainage channel refers to the calculation of the difference between the three-dimensional coordinate data of the concrete surface in two scans, and then the difference in concrete volume Δv between the two scans. The calculated erosion resistance is 5.49h / (kg / ㎡).

[0110] In S5, obtaining the compressive strength of the drainage channel concrete means finding the corresponding compressive strength on the impact and abrasion resistance strength obtained in step S4 and the impact and abrasion resistance strength-compressive strength relationship curve established in S2, that is, obtaining the compressive strength of the drainage channel concrete as 38.92MPa.

[0111] In step S6, based on the compressive strength of the concrete in the drainage channel, it is determined whether the current concrete structure meets the operational requirements. If it does not meet the requirements, it is repaired in a timely manner. If it meets the requirements or after the drainage channel is repaired, steps S3 to S6 are repeated to achieve full life cycle repair of the drainage channel.

[0112] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0113] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A method for non-destructive testing of the compressive strength of concrete in drainage channels throughout their entire life cycle, characterized in that, include: S1, Prepare concrete specimens with the same mix proportions as the spillway concrete; S2, conduct impact and abrasion tests on concrete specimens, and test the impact and abrasion strength and compressive strength after the test to obtain the relationship curve between impact and abrasion strength and compressive strength; S3, acquire data on the concrete surface of the drainage channel; S4. Calculate the abrasion resistance of the concrete in the drainage channel based on the obtained surface data of the drainage channel. S5. Based on the erosion resistance strength of the spillway concrete and the relationship curve between erosion resistance strength and compressive strength, the compressive strength of the spillway concrete is obtained. S6. Based on the compressive strength of the concrete in the drainage channel, determine whether the current concrete structure of the drainage channel meets the operational requirements.

2. The method for non-destructive testing of the compressive strength of concrete in drainage channels throughout their entire life cycle, as described in claim 1, is characterized in that... S2, Impact abrasion resistance test is conducted on concrete specimens. After the test, the impact abrasion resistance strength and compressive strength are measured, and the relationship curves between impact abrasion resistance strength and compressive strength are obtained, including: Core samples were taken from the blasted concrete specimens, and the compressive strength of the cubic core samples was tested to determine the compressive strength of the blasted concrete. The impact resistance strength of concrete specimens is directly measured based on impact abrasion tests. Using the abrasion resistance of concrete as the abscissa and the compressive strength as the ordinate, a scatter plot is formed. The scatter plots are then fitted into a curve to obtain the abrasion resistance-compressive strength relationship curve.

3. The method for non-destructive testing of the compressive strength of concrete in drainage channels throughout their entire life cycle, as described in claim 2, is characterized in that... S1, Preparing concrete specimens with the same mix proportions as the spillway concrete includes: Multiple cylindrical specimens with a diameter of 300 mm and a height of 100 mm, three 150 mm cubic specimens, and three 70 mm cubic specimens were prepared using concrete with the same mix proportions as the drainage channel concrete, and were placed in a standard concrete curing box for 28 days.

4. The method for non-destructive testing of the compressive strength of concrete in drainage channels throughout their entire life cycle, as described in claim 3, is characterized in that... S1, after preparing concrete specimens with the same mix proportions as the spillway concrete, also includes: Establish the conversion relationship of compressive strength between specimens of different sizes.

5. The method for non-destructive testing of the compressive strength of concrete in drainage channels throughout their entire life cycle, as described in claim 4, is characterized in that... The compressive strength of the cubic specimen was tested, and the average value of the test results of three specimens of the same size was taken as the measured value of the compressive strength of the specimen of that size. Based on the measured values ​​of the compressive strength of specimens of different sizes, a conversion relationship of compressive strength between specimens of different sizes was established.

6. The method for non-destructive testing of the compressive strength of concrete in drainage channels throughout their entire life cycle, as described in claim 5, is characterized in that... Core samples were taken from the impact-milled concrete specimens, and the compressive strength of the cubic core samples was tested. This compressive strength of the impact-milled concrete was used as a measure of the concrete's overall compressive strength. The compressive strength of the cubic core sample was tested and converted to the standard cubic compressive strength according to the compressive strength conversion relationship. The average value of the result was taken as the compressive strength of the concrete after grinding.

7. The method for non-destructive testing of the compressive strength of concrete in drainage channels throughout their entire life cycle, as described in any one of claims 1 to 6, is characterized in that... Based on the obtained surface data of the drainage channel, the abrasion resistance strength of the drainage channel concrete is calculated, including: The three-dimensional coordinate data of the concrete surface of the drainage channel were obtained, and the difference between the three-dimensional coordinate data of the surface in two scans was calculated. Then, the difference in concrete volume Δv between the two scans was obtained. Δv is the volume of the detached concrete. The impact and abrasion resistance of the drainage channel concrete was calculated based on Δv.

8. The method for non-destructive testing of the compressive strength of concrete in drainage channels throughout their entire life cycle, as described in claim 7, is characterized in that... The abrasion resistance of the concrete in the drainage channel is calculated using the following formula: In the formula: f a t represents the abrasion resistance strength of concrete, in h / (kg / m²); t represents the abrasion time, in h; A represents the abrasion area, in m²; ρ represents the density of the drainage channel concrete, in kg / m³. 3 Δv is the volume of the detached concrete, in meters. 3 .

9. The method for non-destructive testing of the compressive strength of concrete in drainage channels throughout their entire life cycle, as described in claim 7, is characterized in that... When the drainage channel is completed, a 3D laser scanner is used to scan the surface of the drainage channel to obtain the 3D coordinate data of the concrete surface of the drainage channel. After the drainage channel has been running for a first set time, the surface of the drainage channel is scanned again to obtain the 3D coordinate data of the surface. The first set time is greater than or equal to 24 hours and less than or equal to 72 hours.

10. The method for non-destructive testing of the compressive strength of concrete in drainage channels throughout their entire life cycle, according to any one of claims 1 to 6, is characterized in that... S6. Based on the compressive strength of the spillway concrete, determine whether the current spillway concrete structure meets operational requirements, including: If the system fails to meet operational requirements, repair it promptly. If the operation requirements are met, or after the drainage channel is repaired, repeat steps S3 to S6.

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