Methods for determining the polyurethane content in concrete and readable storage media

Abstract

This application discloses a method for determining the polyurethane content in concrete and a readable storage medium, belonging to the field of concrete. The method includes: preparing multiple target specimens, each consisting of a concrete block and repair mortar, with the concrete block and repair mortar layered together, and the polyurethane content in the repair mortar differing in different target specimens; performing thermal expansion coefficient, thermal conductivity, and shear strength tests on the target specimens to obtain a first polyurethane content range matching the thermal expansion coefficient, a second polyurethane content range matching the thermal conductivity, and a third polyurethane content range matching the shear strength; and determining a target polyurethane content range that simultaneously matches the thermal expansion coefficient, thermal conductivity, and shear strength based on the first, second, and third content ranges.

Description

Technical Field

[0001] This application belongs to the field of concrete, and specifically relates to a method for determining the polyurethane content in concrete and a readable storage medium. Background Technology

[0002] In the field of concrete repair, traditional concrete mix design tests typically focus on evaluating the properties of the concrete or polyurethane repair mortar material itself, such as the concrete's strength and durability, or the repair mortar's adhesion and impermeability. However, in practical engineering applications, the interface properties between the repair mortar and concrete have a crucial impact on the repair outcome. However, related technologies often determine the polyurethane content corresponding to a single concrete property, which can lead to easy separation between the repair mortar and concrete at the interface during repair. Summary of the Invention

[0003] The purpose of this application is to provide a method for determining the polyurethane content in concrete and a readable storage medium, at least to solve the problem of easy separation between the repair mortar and concrete interface when repairing concrete.

[0004] In a first aspect, embodiments of this application provide a method for determining the polyurethane content in concrete, the method comprising:

[0005] Multiple target specimens were prepared. Each target specimen consisted of a concrete block and a repair mortar, with the concrete block and the repair mortar layered together. The polyurethane content in the repair mortar varied among the different target specimens.

[0006] The target specimen was subjected to tests of thermal expansion coefficient, thermal conductivity, and shear strength, respectively, to obtain a first polyurethane content range that matches the thermal expansion coefficient, a second polyurethane content range that matches the thermal conductivity, and a third polyurethane content range that matches the shear strength.

[0007] Based on the first content range, the second content range, and the third content range, a target content range of polyurethane that simultaneously matches the coefficient of thermal expansion, the thermal conductivity, and the shear strength is determined.

[0008] Optionally, determining the target polyurethane content range that simultaneously matches the coefficient of thermal expansion, the thermal conductivity, and the shear strength based on the first content range, the second content range, and the third content range includes:

[0009] The intersection of the first content range, the second content range, and the third content range is determined, and the polyurethane content range represented by the intersection is taken as the target content range.

[0010] Optionally, determining the intersection of the first content range, the second content range, and the third content range includes:

[0011] Plot a first curve between the coefficient of thermal expansion and the content of polyurethane, a second curve between the thermal conductivity and the content of polyurethane, and a third curve between the shear strength and the content of polyurethane.

[0012] The first curve, the second curve, and the third curve are incorporated into the same coordinate system;

[0013] Based on the first content range, the second content range, and the third content range, a first coordinate range is determined on the first curve, a second coordinate range is determined on the second curve, and a third coordinate range is determined on the third curve, respectively.

[0014] The intersection of the first coordinate range, the second coordinate range, and the third coordinate range on the same coordinate axis is determined, and the polyurethane content range represented by the intersection is taken as the target content range.

[0015] Optionally, determining the intersection of the first content range, the second content range, and the third content range includes:

[0016] The test data of the coefficient of thermal expansion with the first content range, the test data of the thermal conductivity with the second content range, and the test data of the shear strength with the third content range are respectively fitted with multiple quadratic regression equations to obtain a first surface model, a second surface model, and a third surface model. The first surface model represents the model of the coefficient of thermal expansion with the content of polyurethane, the second surface model represents the model of the thermal conductivity with the content of polyurethane, and the third surface model represents the model of the shear strength with the content of polyurethane.

[0017] Based on the first surface model, the second surface model, and the third surface model, the intersection of the first surface model, the second surface model, and the third surface model is determined, and the polyurethane content range represented by the intersection is taken as the target content range.

[0018] Optionally, the polyurethane content in the repair mortar of the multiple target specimens is distributed in a gradient.

[0019] Optionally, before performing thermal expansion coefficient testing, thermal conductivity testing, and shear strength testing on the target specimen, the determination method further includes:

[0020] Test channels are provided on the target specimen. The test channels are located at the interface between the repair mortar and the concrete block. The repair mortar has a portion of the test channels, and the concrete block has another portion of the test channels.

[0021] Optionally, test channels are provided on the target specimen, including:

[0022] When preparing the target specimen, a test tube is placed at the interface between the concrete block and the repair mortar. After the repair mortar and the concrete block solidify, the space inside the test tube forms the test channel.

[0023] Secondly, embodiments of this application provide a readable storage medium that stores the method for determining the polyurethane content in concrete as described in any one of the first aspects above.

[0024] In this embodiment, multiple target specimens are prepared, each consisting of a concrete block and repair mortar, with the concrete block and repair mortar layered together. The polyurethane content in the repair mortar varies in different target specimens. The target specimens are then subjected to tests for thermal expansion coefficient, thermal conductivity, and shear strength. This yields a first polyurethane content range matching the thermal expansion coefficient, a second polyurethane content range matching the thermal conductivity, and a third polyurethane content range matching the shear strength. Based on these three content ranges, a target polyurethane content range matching the thermal expansion coefficient, thermal conductivity, and shear strength is determined. In other words, in this embodiment, by determining the first, second, and third content ranges, the target polyurethane content range is determined. A polyurethane content within the target range corresponds to improved physical and mechanical properties of the repair mortar, as well as deformation compatibility, thermal stability compatibility, and mechanical compatibility at the interface. This ensures the overall quality and durability of the repair project and prevents separation and cracking at the interface between the repair mortar and the concrete block. Attached Figure Description

[0025] Figure 1 This is a flowchart illustrating a method for determining the polyurethane content in concrete according to an embodiment of this application;

[0026] Figure 2 This diagram illustrates a target specimen provided in an embodiment of this application.

[0027] Figure 3 This is a graph showing the coefficient of thermal expansion versus the content of polyurethane provided in an embodiment of this application.

[0028] Figure 4 This is a graph showing the relationship between thermal conductivity and polyurethane content in an embodiment of this application.

[0029] Figure 5 This is a graph showing the relationship between shear strength and polyurethane content provided in an embodiment of this application.

[0030] Figure 6 This is a graph showing the coefficient of thermal expansion, thermal conductivity, shear strength, and polyurethane content in an embodiment of this application, all within the same coordinate system.

[0031] Figure label:

[0032] 10: Repair mortar; 20: Concrete block; 30: Test channel. Detailed Implementation

[0033] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0034] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] This application provides a method for determining the polyurethane content in concrete, such as... Figure 1 As shown, the determination method includes:

[0037] Step 101: Prepare multiple target specimens. Each target specimen consists of a concrete block and a repair mortar, with the concrete block and the repair mortar layered together. The polyurethane content in the repair mortar varies in different target specimens.

[0038] In preparing the target specimen, a concrete block can be pre-prepared, and at least one surface of the concrete block can be roughened to make at least one surface of the concrete block relatively rough. Then, a repair mortar containing polyurethane is poured onto the roughened surface to modify the interface between the mortar and the concrete block. The roughening of the concrete block can be done by mechanical grooving, that is, grooves are made on the concrete block using mechanical parts to make the surface of the concrete block relatively rough. The groove depth can be 3mm to 5mm, the groove width can be 5mm, and the distance between two adjacent grooves can be 20mm. Of course, the groove depth, groove width, and distance between two adjacent grooves can also be other values, for example, a groove depth of 5mm to 6mm, a groove width of 6mm, and a distance between two adjacent grooves of 25mm. This embodiment of the application does not limit this aspect.

[0039] In addition, in the embodiments of this application, polyurethane is incorporated into the repair mortar in the form of prepolymer, and the amount of polyurethane incorporated is calculated as a percentage.

[0040] Furthermore, in this embodiment, the size of the concrete block can be set according to actual needs. For example, the size of the concrete block can be 100mm × 100mm × 100mm, or 120mm × 120mm × 120mm. This embodiment does not limit the size of the concrete block in this respect.

[0041] Furthermore, in this embodiment, the polyurethane content in the modified mortar at different locations at the interface between the concrete block and the repair mortar in each target specimen can also be different. This setting allows for a greater number of test results to be obtained during subsequent testing of the target specimen, facilitating the determination of a suitable polyurethane content range. For example, the interface between the concrete block and the repair mortar may have locations A, B, and C. The polyurethane content in the repair mortar at location A is 5%, at location B it is 10%, and at location C it is 15%.

[0042] It should be noted that in this embodiment, the polyurethane content in the repair mortar of multiple target specimens is distributed in a gradient. This arrangement facilitates the determination of the polyurethane content range under different tests when performing various tests on the target specimens. For example, the multiple target specimens are target specimen A, target specimen B, and target specimen C. The polyurethane content in the repair mortar of target specimen A is 10%, the polyurethane content in the repair mortar of target specimen B is 15%, and the polyurethane content in the repair mortar of target specimen C is 20%. The gradient can be 5%, meaning the polyurethane content in different target specimens varies by 5%. Of course, the gradient can also be other values, such as 8%. The specific value of the gradient is not limited in this embodiment.

[0043] Step 102: Perform thermal expansion coefficient test, thermal conductivity test and shear strength test on the target specimen respectively, and obtain the first content range of polyurethane that matches the thermal expansion coefficient, the second content range of polyurethane that matches the thermal conductivity and the third content range of polyurethane that matches the shear strength.

[0044] Specifically, when testing the coefficient of thermal expansion of the target specimen, the existing sealed strain gauge method can be used to measure the linear expansion under a temperature rise of 10℃ to 60℃. Furthermore, before conducting the coefficient of thermal expansion test, a strain gauge probe can be pre-embedded in the target specimen, facilitating the acquisition of the test results through the strain gauge probe.

[0045] Specifically, when testing the coefficient of thermal expansion of the target specimen, the concrete block has a fixed coefficient of thermal expansion. There is a range of polyurethane content near the point where the coefficients of thermal expansion of the repair mortar and the concrete block are equal, namely the first content range. The polyurethane content within the first content range can make the coefficient of thermal expansion of the repair mortar as close as possible to that of the concrete, thereby effectively avoiding easy cracking at the interface between the repair mortar and the concrete block.

[0046] In addition, when testing the coefficient of thermal expansion of the target specimen, the temperature gradient can be kept to ≤0.5℃. That is, the temperature is increased according to the temperature gradient, and the temperature gradient is kept to ≤0.5℃. This can ensure that there are more test results for thermal expansion testing and that the results are more accurate.

[0047] In addition, when testing the thermal conductivity of the target specimen, an existing thermal conductivity meter can be used. Specifically, the probe power of the thermal conductivity meter can be 5-20W, and the measurement time can be 40 seconds. Furthermore, before conducting the thermal conductivity test on the target specimen, the thermal conductivity meter probe can be pre-embedded in the target specimen, making it easier to obtain the test results through the thermal conductivity meter.

[0048] Specifically, when testing the thermal conductivity of the target specimen, the concrete block has a fixed thermal conductivity value. Near the point where the thermal conductivity of the repair mortar and the concrete block are equal, there is a range of polyurethane content, namely the second content range. The polyurethane content within the second content range can make the thermal conductivity of the repair mortar as close as possible to that of the concrete, thereby effectively making the temperature field distribution at the interface between the repair mortar and the concrete block uniform, and making the interface between the polyurethane and the concrete less prone to cracking.

[0049] In addition, when testing the shear strength of the target specimen, the existing national standard can be used for the interface direct shear test.

[0050] Specifically, when testing the shear strength of the target specimen, the concrete block has a fixed shear strength value. There is a range of polyurethane content near the point where the shear strength of the repair mortar and the concrete block are equal, namely the third content range. When the polyurethane content is within the third content range, the shear strength of the repair mortar can be made as close as possible to the shear strength of the concrete, thereby effectively improving the structural durability of the target specimen, that is, ensuring that the interface between polyurethane and concrete is not prone to cracking.

[0051] Furthermore, in this embodiment, the matching degree between the thermal expansion coefficient of the repair mortar and the thermal expansion coefficient of the concrete block satisfies Δα≤8×10⁻ 6 The interfacial thermal conductivity at the interface between the repair mortar and the concrete block is ≥1.5 W / (m·K), and the shear strength of the target specimen is ≥75% of the tensile strength of the concrete.

[0052] In some implementations, prior to step 102, the determination method further includes: setting test channels on the target specimen, the test channels being located at the interface between the repair mortar and the concrete block, and the repair mortar having some test channels and the concrete block having other test channels.

[0053] By setting test channels in the target specimen, test probes, such as thermal conductivity probes and strain gauge probes, can be pre-installed within these channels, facilitating testing of the target specimen. Furthermore, the test channels are located at the interface between the repair mortar and the concrete block, allowing for effective testing of this interface. Since the interface is prone to cracking, obtaining test results at this interface allows for the determination of the appropriate polyurethane content, effectively preventing cracking at the repair mortar and concrete block interface.

[0054] Specifically, such as Figure 2As shown, test channels 30 are set at the interface between the repair mortar 10 and the concrete block 20 in the target specimen.

[0055] In addition, in some implementation methods, the test channel on the target specimen can be set as follows: when preparing the target specimen, a test tube is set at the interface between the concrete block and the repair mortar. After the repair mortar and the concrete block solidify, the space inside the test tube forms a test channel.

[0056] By setting up a test tube, the space inside the test tube forms a test channel. When a test probe is placed in the test channel, the test tube can effectively protect the test probe and avoid the problem of inaccurate test results caused by easy damage to the test probe.

[0057] It should be noted that the inner diameter of the test tube can be set according to actual needs. For example, the inner diameter of the test tube may be 10 mm, or even 12 mm. This application does not limit the specific inner diameter of the test tube.

[0058] Step 103: Based on the first content range, the second content range, and the third content range, determine the target content range of polyurethane that matches the coefficient of thermal expansion, thermal conductivity, and shear strength simultaneously.

[0059] Once the first, second, and third content ranges are determined, the polyurethane content within the first range ensures that the interface between the repair mortar and the concrete block is less prone to cracking. The polyurethane content within the second range ensures a uniform temperature field distribution at the interface. The polyurethane content within the third range ensures improved structural durability at the interface. This determines the target content range. Once the polyurethane content is within the target range, it is equivalent to considering the physical and mechanical properties of the target specimen, as well as the deformation compatibility, thermal stability compatibility, and mechanical compatibility at the interface. This ensures the overall quality and durability of the structure formed after concrete repair.

[0060] In some implementations, step 103 can be implemented by: determining the intersection of the first content range, the second content range, and the third content range, and using the polyurethane content range represented by the intersection as the target content range.

[0061] Since the first content range, the second content range, and the third content range all represent specific ranges, the intersection between the first content range, the second content range, and the third content range can be determined. The polyurethane content range represented by this intersection can simultaneously meet the requirements for thermal expansion coefficient, thermal conductivity, and shear strength.

[0062] In some implementations, determining the intersection of the first, second, and third content ranges can be achieved by: plotting a first curve relating the coefficient of thermal expansion to the polyurethane content, a second curve relating the thermal conductivity to the polyurethane content, and a third curve relating the shear strength to the polyurethane content; merging the first, second, and third curves into the same coordinate system; determining the first coordinate range on the first curve, the second coordinate range on the second curve, and the third coordinate range on the third curve based on the first, second, and third content ranges; determining the intersection of the first, second, and third coordinate ranges on the same coordinate axis, and using the polyurethane content range represented by the intersection as the target content range.

[0063] Specifically, when testing the coefficient of thermal expansion of the target specimen, a first curve can be plotted based on the test results, relating the coefficient of thermal expansion to the polyurethane content. When testing the thermal conductivity of the target specimen, a second curve can be plotted based on the test results, relating the thermal conductivity to the polyurethane content. When testing the shear strength of the target specimen, a third curve can be plotted based on the test results, relating the shear strength to the polyurethane content. Once the first, second, and third curves are obtained, they can be incorporated into the same coordinate system, meaning that the first, second, and third curves are located on the same coordinate axis. At this point, the first content range on the first curve, the second content range on the second curve, and the third content range on the third curve can be determined on the same coordinate axis, and the first coordinate range corresponding to the first content range, the second coordinate range corresponding to the second content range, and the third coordinate range corresponding to the third content range can be determined. The intersection of the first, second, and third coordinate ranges on the same coordinate axis is the target content range of the polyurethane content.

[0064] For example, such as Figure 3 The curve shown illustrates the relationship between the coefficient of thermal expansion and the polyurethane content. Figure 4 The curve shown represents the relationship between thermal conductivity and polyurethane content. Figure 5 As shown, the curve represents the relationship between shear strength and polyurethane content, as follows: Figure 6 The curves shown represent the coefficient of thermal expansion, thermal conductivity, and shear strength relative to the polyurethane content on the same coordinate system. Figure 6 In this context, 'a' represents the first content range, 'b' represents the second content range, and 'c' represents the third content range. Therefore, the intersection of the first, second, and third content ranges can be determined. Figure 6 The range of intersection of a, b, and c represents the target content range of polyurethane.

[0065] In some implementations, determining the intersection of the first, second, and third content ranges can be achieved by: performing multivariate quadratic regression equations to fit the test data of the coefficient of thermal expansion with the first content range, the test data of the thermal conductivity with the second content range, and the test data of the shear strength with the third content range, respectively, to obtain a first surface model, a second surface model, and a third surface model. The first surface model represents the model of the coefficient of thermal expansion with the content of polyurethane, the second surface model represents the model of the thermal conductivity with the content of polyurethane, and the third surface model represents the model of the shear strength with the content of polyurethane. Based on the first surface model, the second surface model, and the third surface model, the intersection of the first surface model, the second surface model, and the third surface model is determined, and the polyurethane content range represented by the intersection is taken as the target content range.

[0066] In this process, the test data of thermal expansion coefficient are fitted with the first content range, the test data of thermal conductivity are fitted with the second content range, and the test data of shear strength are fitted with the third content range using a multiple quadratic regression equation. The multiple quadratic regression equation can represent the surface, thus obtaining the first surface model, the second surface model, and the third surface model. Then, the first surface model, the second surface model, and the third surface model are placed in the same coordinate system, and the intersection of the first surface model, the second surface model, and the third surface model is taken as the target content range of polyurethane.

[0067] In this embodiment, multiple target specimens are prepared, each consisting of a concrete block and repair mortar, with the concrete block and repair mortar layered together. The polyurethane content in the repair mortar varies in different target specimens. The target specimens are then subjected to tests for thermal expansion coefficient, thermal conductivity, and shear strength. This yields a first polyurethane content range matching the thermal expansion coefficient, a second polyurethane content range matching the thermal conductivity, and a third polyurethane content range matching the shear strength. Based on these three content ranges, a target polyurethane content range that simultaneously matches the thermal expansion coefficient, thermal conductivity, and shear strength is determined. In other words, in this embodiment, by determining the first, second, and third content ranges, the target polyurethane content range is determined. A polyurethane content within the target range corresponds to improved physical and mechanical properties of the repair mortar, as well as deformation compatibility, thermal stability compatibility, and mechanical compatibility at the interface. This ensures the overall quality and durability of the repair project and prevents separation and cracking at the interface between the repair mortar and the concrete block.

[0068] This application provides a readable storage medium that stores the method for determining the polyurethane content in concrete according to any of the above embodiments.

[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0070] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for determining the polyurethane content in concrete, characterized in that, The determination method includes: Multiple target specimens were prepared. Each target specimen consisted of a concrete block and a repair mortar, with the concrete block and the repair mortar layered together. The polyurethane content in the repair mortar varied among the different target specimens. The target specimen was subjected to tests of thermal expansion coefficient, thermal conductivity, and shear strength, respectively, to obtain a first polyurethane content range that matches the thermal expansion coefficient, a second polyurethane content range that matches the thermal conductivity, and a third polyurethane content range that matches the shear strength. Based on the first content range, the second content range, and the third content range, a target content range of polyurethane that simultaneously matches the coefficient of thermal expansion, the thermal conductivity, and the shear strength is determined. The step of determining a target polyurethane content range that simultaneously matches the coefficient of thermal expansion, the thermal conductivity, and the shear strength based on the first content range, the second content range, and the third content range includes: Determine the intersection of the first content range, the second content range, and the third content range, and use the polyurethane content range represented by the intersection as the target content range; Wherein, the polyurethane content being within the first content range ensures that the interface between the repair mortar and the concrete block is not prone to cracking; the polyurethane content being within the second content range ensures that the temperature field distribution at the interface between the repair mortar and the concrete block is uniform; and the polyurethane content being within the third content range ensures that the structural durability at the interface between the repair mortar and the concrete block is improved.

2. The method for determining the polyurethane content in concrete according to claim 1, characterized in that, Determining the intersection of the first content range, the second content range, and the third content range includes: Plot a first curve between the coefficient of thermal expansion and the content of polyurethane, a second curve between the thermal conductivity and the content of polyurethane, and a third curve between the shear strength and the content of polyurethane. The first curve, the second curve, and the third curve are incorporated into the same coordinate system; Based on the first content range, the second content range, and the third content range, a first coordinate range is determined on the first curve, a second coordinate range is determined on the second curve, and a third coordinate range is determined on the third curve, respectively. The intersection of the first coordinate range, the second coordinate range, and the third coordinate range on the same coordinate axis is determined, and the polyurethane content range represented by the intersection is taken as the target content range.

3. The method for determining the polyurethane content in concrete according to claim 1, characterized in that, Determining the intersection of the first content range, the second content range, and the third content range includes: The test data of the coefficient of thermal expansion with the first content range, the test data of the thermal conductivity with the second content range, and the test data of the shear strength with the third content range are respectively fitted with multiple quadratic regression equations to obtain a first surface model, a second surface model, and a third surface model. The first surface model represents the model of the coefficient of thermal expansion with the content of polyurethane, the second surface model represents the model of the thermal conductivity with the content of polyurethane, and the third surface model represents the model of the shear strength with the content of polyurethane. Based on the first surface model, the second surface model, and the third surface model, the intersection of the first surface model, the second surface model, and the third surface model is determined, and the polyurethane content range represented by the intersection is taken as the target content range.

4. The method for determining the polyurethane content in concrete according to claim 1, characterized in that, The polyurethane content in the repair mortar of multiple target specimens exhibits a gradient distribution.

5. The method for determining the polyurethane content in concrete according to any one of claims 1-4, characterized in that, Before conducting thermal expansion coefficient, thermal conductivity, and shear strength tests on the target specimen, the determination method further includes: Test channels are provided on the target specimen. The test channels are located at the interface between the repair mortar and the concrete block. The repair mortar has a portion of the test channels, and the concrete block has another portion of the test channels.

6. The method for determining the polyurethane content in concrete according to claim 5, characterized in that, The test channel is formed on the target specimen, including: When preparing the target specimen, a test tube is placed at the interface between the concrete block and the repair mortar. After the repair mortar and the concrete block solidify, the space inside the test tube forms the test channel.

7. A readable storage medium, characterized in that, The readable storage medium stores the method for determining the polyurethane content in concrete according to any one of claims 1-6.

Images