Non-curable flexible waterproof coating fatigue performance test device and method

Abstract

The present disclosure provides a non-cured flexible waterproof coating fatigue performance test device and method, the upper surface of the support has a first area with a first color, the cylinder is provided with a first hole position at the bottom above the support, the first hole position is opposite to the first area, and the cylinder is used for containing a target liquid with a second color; the target structure comprises: a first target body and a second target body, the lower surface of the first target body is attached to the inner bottom wall of the cylinder and is fixed relative to the cylinder, and the first target body is provided with a fluid channel penetrating through the upper and lower surfaces thereof and opposite to the first hole position, the second target body is stacked on the upper surface of the first target body, and the upper end of the second target body is provided with a connecting portion connected with a driving mechanism driving the second target body to reciprocate up and down; the target structure has an annular connecting area located in the target liquid on the side, the annular connecting area is located at the first target body and the second target body at the two ends in the axial direction of the cylinder respectively, and the annular connecting area is used for connecting the non-cured flexible waterproof coating.

Description

Technical Field

[0001] This disclosure relates to the field of waterproof performance testing technology for building materials, and in particular to a fatigue performance testing device and method for non-curing flexible waterproof coatings. Background Technology

[0002] Non-curing flexible waterproof coatings are a type of waterproof material that uses rubber asphalt or modified polymers as the main film-forming substances. They maintain a creep state at room temperature and have excellent self-healing and structural deformation adaptability. They are widely used in projects such as building basement floors and municipal bridge decks.

[0003] In practical engineering, the concrete substrate to which non-curing flexible waterproof coatings adhere is subjected to cyclic dynamic loads over a long period, leading to damage and loss of waterproofing function. For example, when non-curing flexible waterproof coatings are applied to the floors of building basements or the decks of municipal bridges, the frequency of vehicle traffic is approximately 2-20 Hz, and the strain amplitude is approximately 1 × 10⁻⁶. -4 -5×10 -4 The fatigue strain causes the waterproof coating to be subjected to tensile stress repeatedly, resulting in fatigue damage or even cracking, and thus losing its waterproof function.

[0004] In related technologies, the performance testing of waterproof materials is limited to static testing, which ignores the impact of heavy objects such as vehicles passing over the concrete substrate to which the waterproof material is attached, resulting in inaccurate test results. Summary of the Invention

[0005] This disclosure provides a fatigue performance testing device and method for non-curing flexible waterproof coatings. One of the technical problems it aims to solve is to test non-curing flexible waterproof coatings under dynamic conditions in order to improve the accuracy of the test results.

[0006] In a first aspect, this disclosure provides a fatigue performance testing device for a non-curing flexible waterproof coating, which may include: a support, a cylinder, and a target structure. The upper surface of the support has a first region, which has a first color. The cylinder is disposed above the support and has a first hole at its bottom, which is opposite to the first region. The cylinder is used to hold a target liquid with a second color. The target structure may include: a first target body and a second target body. The lower surface of the first target body is attached to the inner bottom wall of the cylinder and fixed relative to the cylinder. The first target body is provided with a fluid channel penetrating its upper and lower surfaces and opposite to the first hole. The second target body is stacked on the upper surface of the first target body, and a connecting part is provided at the upper end of the second target body. The connecting part is used to connect to a driving mechanism that drives the second target body to reciprocate up and down. The target structure has an annular connecting region located in the target liquid on its periphery. One end of the annular connecting region is located on the first target body and the other end is located on the second target body in the axial direction of the cylinder. The annular connecting region is used to connect the non-curing flexible waterproof coating.

[0007] In some embodiments, the testing apparatus may further include: a functional structure connected to the first target body and the second target body, the second target body moving along the functional structure, and the functional structure limiting the relative movement distance between the first target body and the second target body in the radial direction of the cylinder to be less than the movement distance of the second target body in the axial direction of the cylinder.

[0008] In some embodiments, the first target body is provided with a plurality of first channels around its axis; the second target body is provided with a plurality of second channels around its axis, and the plurality of second channels are respectively positioned opposite to the plurality of first channels; the functional structure includes: a plurality of first functional rods, the first functional rods being slidably inserted into the first channels and second channels that are positioned opposite each other, and the distance between the first functional rod and the inner wall of the first channel and the distance between the first functional rod and the inner wall of the second channel are both less than the distance the second target body moves upward.

[0009] In some embodiments, the functional structure further includes: a plurality of second functional rods, each of which is connected to the inner bottom wall of the cylinder and arranged around the axis of the first target body, and the distance between the second functional rod and the first target body opposite to it is less than the distance the second target body moves upward.

[0010] In some embodiments, both the first target body and the second target body are cylinders, and the axis of the first target body, the axis of the second target body, and the axis of the cylinder coincide.

[0011] In some embodiments, the axis of the first target body, the axis of the second target body, and the axis of the cylinder coincide, and the radial dimension of one of the first target body and the second target body gradually increases in the direction away from the other, and the other is a cylinder.

[0012] In some embodiments, the inner wall of the fluid channel is coated with a hydrophobic layer.

[0013] In some embodiments, the first area is provided with white test paper to make the first color white; the target liquid is an aqueous solution of carmine to make the second color red.

[0014] Secondly, this disclosure provides a fatigue performance testing method for a non-curing flexible waterproof coating, applied to the testing apparatus described in any embodiment of the first aspect. The testing method includes: coating a non-curing flexible waterproof coating on an annular connecting area to form a waterproof membrane layer; injecting a target liquid with a height greater than that of the waterproof membrane layer into a cylinder; driving a second target body to reciprocate up and down relative to a first target body via a driving mechanism; after a target time, determining whether the color displayed in the first area is the target color, wherein the target color is a mixture of the first color and the second color; if yes, the fatigue performance of the waterproof membrane layer does not meet the requirements; if no, the fatigue performance of the waterproof membrane layer meets the requirements.

[0015] In some embodiments, after driving the second target body to move up and down relative to the first target body through the driving mechanism, the method further includes: adjusting the temperature of the environment in which the test device is located.

[0016] Through the above technical solution, the fatigue performance testing device and method for non-curing flexible waterproof coatings provided in this disclosure can include: a support, a cylinder, and a target structure. A first area on the upper surface of the support can display a first color. The receiving cavity inside the cylinder can hold a target liquid with a second color. A first target body and a second target body are stacked inside the cylinder. The first target body has a fluid channel corresponding to a first hole at the bottom of the cylinder, so that the receiving cavity, the stacking seam between the first and second target bodies, the fluid channel of the first target body, and the first hole form a connecting path. When the non-curing flexible waterproof coating is coated on the annular connecting area on both sides of the first and second target bodies, and the second target body reciprocates in the direction of moving closer to and away from the first target body, if the waterproof coating is damaged, the target pigment will flow along the connecting path to the first area, so that the first color in the first area is mixed with the second color. In this way, the waterproof performance of the non-curing flexible waterproof coating can be quickly judged by the color displayed in the first area. Because the driving mechanism drives the second target body, it realizes the dynamic simulation of the cyclic dynamic load parallel to the surface of the concrete matrix, thereby improving the accuracy of the test results of the fatigue performance of the non-curing flexible waterproof coating.

[0017] The above description is only an overview of the technical solution of this disclosure. In order to better understand the technical means of this disclosure and to implement it in accordance with the contents of the specification, the preferred embodiments of this disclosure are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a perspective structural diagram of the experimental apparatus provided in this disclosure; Figure 2 A perspective view of the experimental apparatus (without the target structure assembled) provided in this disclosure; Figure 3 A perspective view of the first target body of the experimental apparatus provided in this disclosure. Figure 1 ; Figure 4 A perspective view of the first target body of the experimental apparatus provided in this disclosure. Figure 2 ; Figure 5 A perspective view of the second target body of the experimental apparatus provided in this disclosure. Figure 1 ; Figure 6 A perspective view of the second target body of the experimental apparatus provided in this disclosure. Figure 2 .

[0020] Explanation of reference numerals in the attached figures: 10. Test apparatus; 11. Support; 111. First region; 112. Connecting rod; 12. Cylinder; 121. First hole; 13. Target structure; 131. First target body; 1311. Fluid channel; 1312. First channel; 132. Second target body; 1321. Connecting part; 1322. Second channel; 133. Annular connecting area; 14. Functional structure; 141. First functional rod. Detailed Implementation

[0021] The embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of this disclosure by way of example, but should not be used to limit the scope of this disclosure. This disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0022] These embodiments are provided to make the disclosure thorough and complete, and to fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0023] It should be noted that, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationship, are only for the convenience of describing this disclosure 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 disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] Furthermore, the terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible margin of error. "Parallel" is not strictly parallel, but within the permissible margin of error. Terms such as "including" or "contains" mean that the element preceding the word encompasses the element listed after the word, and do not exclude the possibility of encompassing other elements as well.

[0025] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" 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 direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure depending on the specific circumstances. When a particular device is described as being located between a first device and a second device, an intermediary device may or may not be present between the particular device and the first or second device.

[0026] All terms used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0027] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0028] The inventors of this disclosure have discovered a device and method for testing the fatigue performance of a non-curing flexible waterproof coating. This device can adhere the non-curing flexible waterproof coating to the periphery of both a first target portion and a second target portion of a simulated concrete substrate to form a waterproof membrane layer. A driving mechanism can provide reciprocating motion forces to the second target portion, moving closer to and further away from the first target portion, to simulate the cyclic dynamic load of tensile stress on the concrete substrate over a long period of time. Under this setup, it is possible to determine whether the non-curing flexible waterproof membrane layer has fatigue damage, achieving dynamic monitoring and improving the accuracy of the test results.

[0029] First aspect This disclosure provides a fatigue performance testing device 10 for non-curing flexible waterproof coatings, see [link / reference]. Figure 1 and Figure 2As shown, the test apparatus 10 may include: a support 11, a cylinder 12, and a target structure 13. The upper surface of the support 11 has a first region 111, which has a first color. The cylinder 12 is disposed above the support 11, and its bottom has a first hole 121, which is opposite to the first region 111. The cylinder 12 is used to hold a target liquid with a second color. The target structure 13 may include: a first target body 131 and a second target body 132. The lower surface of the first target body 131 is attached to the inner bottom wall of the cylinder 12 and fixed relative to the cylinder 11. The first target body 131 is provided with a through-hole. The upper and lower surfaces have fluid channels 1311 that are opposite to the first hole 121. The second target body 132 is stacked on the upper surface of the first target body 131, and the upper end of the second target body 132 is provided with a connecting part 1321. The connecting part 1321 is used to connect with the drive mechanism that drives the second target body 132 to move up and down. The target structure 13 has an annular connecting area 133 located in the target liquid on its periphery. One end of the annular connecting area 133 is located in the first target body 131 and the other end is located in the second target body 132 in the axial direction of the cylinder 12. The annular connecting area 133 is used to connect the non-curing flexible waterproof coating.

[0030] The bracket 11 can form the load-bearing part and support part of the test device 10, so as to be able to bear and support other structures of the test device 10 such as the cylinder 12 and the target structure 13. The top surface of the bracket 11 can include a first area 111 in the shape of a circle, a rectangle, or a rhombus, and the first color of the first area 111 can be white, yellow, or other colors.

[0031] The cylinder 12 is hollow inside to form a receiving cavity, and its bottom has a first hole 121 communicating with the receiving cavity, making the first hole 121 an opening at the bottom of the receiving cavity. The receiving cavity of the cylinder 12 can be filled with a target liquid of a second color different from the first color. This liquid can be pre-injected or temporarily injected before the test through a separate inlet on the cylinder 12 (such as its top surface). This inlet can be the assembly port for the first target body 131 and the second target body 132, and can be used to replenish the target liquid if its height is insufficient due to evaporation or other reasons. The second color can be a deeper red, green, or other color than the first color. The cylinder 12 can be a cylindrical container made of a chemically resistant material (such as high-density polyethylene, HDPE, 304 stainless steel, etc.). Its bottom can also be provided with a drain port different from the first hole 121 and a drain valve to close the drain port, so that the drain valve can be opened after the test for safe, targeted discharge of the target liquid.

[0032] The target structure 13 can be assembled into the receiving cavity of the cylinder 12. After assembly, the distance between the bottom surface of the first target body 131 in the target structure 13 and the inner bottom wall of the cylinder 12 approaches zero or is equal to zero, so that the two fit together. The fluid channel 1311 of the first target body 131 passes through the two surfaces of the first target body 131 facing away from and towards the first hole 121, and communicates with the first hole 121. At the same time, the second target body 132 is stacked on the first target body 131, and its upper end facing away from the first target body 131 can be provided with a connecting part 1321 for connection with the driving mechanism. Here, both the first target body 131 and the second target body 132 can be made of silicate cement and medium sand (particle size 0.25~0.50). The material is made of cement mortar composed of water, mud (with a mud content of no more than 2.0%), and a mass ratio of 1:2:0.4. The joint between the two is a direct interface between the hard substrate and the concrete substrate, thus realistically replicating the stress boundary conditions at the joint of the concrete substrate. The upper surface of the first target body 131 and the lower surface of the second target body 132 can be ground to increase the interlocking force after stacking, thus realistically replicating the joint position of the concrete substrate. The areas of the upper surface of the first target body 131 and the lower surface of the second target body 132 are basically the same (including absolutely the same, slightly different, and relatively the same) and basically overlap, so as to reduce the possibility of excessive misalignment and deviation from the actual project. The liquid content is close to zero or equal to zero, so that the target liquid in the containment space cannot enter the first hole 121 through the gap between the first target body 131 and the inner bottom wall of the cylinder 12. The inner bottom wall of the cylinder 12 can be provided with a hooking part to engage with the first target body 131. The first target body 131 and the inner bottom wall of the cylinder 12 are kept in a close fit. In addition, a corrosion-resistant layer (such as a polytetrafluoroethylene layer) can be sandwiched between the first target body 131 and the inner bottom wall of the cylinder 12. A clearance through hole is opened at the position corresponding to the first hole 121 to further ensure that the target liquid cannot enter the first hole 121 through the gap between the first target body 131 and the inner bottom wall of the cylinder 12. The driving mechanism can be a motor, cylinder, fatigue testing machine, etc. The connecting part 1321 can be connected to the output shaft of the motor through a coaxial connector, or it can be connected to the piston of the cylinder through a coaxial connector, etc., to generate a cyclic dynamic load parallel to the horizontal plane such as the bridge surface or the ground surface generated by heavy objects such as vehicles. The target liquid of the second color in the containing space can enter the fluid channel 1311 through the position between the first target body 131 and the second target body 132, and fall into the first area 111 through the first hole 121 to change the color of the first area 111.

[0033] See one example. Figure 1 and Figure 2As shown, the fatigue performance testing device 10 for non-curing flexible waterproof coatings may include: a support 11, a cylinder 12, and a target structure 13. The upper surface of the support 11 has a circular first region 111, which has a first color, namely white. The cylinder 12 is located above the support 11, and its bottom has a first hole 121 with a radial dimension smaller than that of the first region 111. The cylinder 12 is connected to the support 11 above by multiple connecting rods 112, with a gap between the first hole 121 and the first region 111 and their centers facing each other. The cylinder 12 is used to hold a target liquid with a second color. The target structure 13 may include: a first target body 131 and a second target body 132. Both the first target body 131 and the second target body 132 are made of cement, medium sand, and water in a mass ratio of 1:2:0.4. The cement is silicate cement with a specific surface area of ​​approximately 360 m². 2 / kg, with a compressive strength of 22 MPa after 3 days and 48 MPa after 28 days. The medium sand has a particle size of 0.35–0.50 mm, a mud content of approximately 1.2%, and an apparent density of approximately 2.65 g / cm³. 3 The pH value of the water is approximately 7.2. The lower surface of the first target body 131 is attached to the inner bottom wall of the cylinder 12 and fixed relative to the inner bottom wall. The first target body 131 is provided with a fluid channel 1311 that runs through its upper and lower surfaces and is opposite to the first hole 121. The second target body 132 is located on the upper surface of the first target body 131, and a connecting part 1321 is provided at the upper end of the second target body 132. The connecting part 1321 is used to connect to a fatigue testing machine that drives the second target body 132 to reciprocate up and down. The target structure 13 has an annular connecting region 133 located within the target liquid on its periphery. Half of the annular connecting region 133 is located on the first target body 131 and the other half is located on the second target body 132 along the axial direction of the cylinder 12. The annular connecting region 133 is used to connect a non-curing flexible waterproof coating. The test steps of this test device 10 may include: S101: Apply a non-curing flexible waterproof coating to the annular connection area 133 to form a waterproof membrane layer. The non-curing flexible waterproof coating is a non-curing rubber asphalt waterproof coating with a solid content ≥99%, a softening point ≥50℃, and low-temperature flexibility -20℃ without cracking. The height of the non-curing flexible waterproof membrane layer is 100 mm, and the thickness is about 1.9-2.1 mm. It is left to cure for 72 hours in an environment of 21-25°. S102: Assemble the target structure 13 into the cylinder 12, and slowly inject a target liquid with a mass concentration of 5.0% and a height greater than the non-cured flexible waterproof membrane layer by 30 mm into the cylinder 12 along the inner wall of the cylinder 12. The target liquid is carmine red with a purity of ≥98%. S103: Apply an axial displacement load of the cylinder 12 to the second target body 132 through a fatigue testing machine to drive the second target body 132 to reciprocate up and down relative to the first target body 131. S104: After the target time, the color displayed in the first area 111 can be determined by visual inspection, image acquisition, or other means through the interval between the first hole 121 and the first area 111. The target color is a mixture of the first color and the second color. Here, the target time is a continuous time, such as 2 minutes, 3 minutes, etc. S105: If so, the fatigue performance of the waterproof membrane does not meet the requirements; S106: If not, the fatigue performance of the waterproof membrane meets the requirements.

[0034] In Experiment 1, the above-mentioned steps were performed sequentially on three waterproof membrane layers. In each test, the fatigue testing machine was set with the following parameters: median displacement 3 mm, amplitude 1 mm, frequency 5 Hz, sinusoidal loading, and 10,000 cycles. The color of the first region 111 corresponding to the three waterproof membrane layers did not change to a mixed color, indicating that the fatigue performance met the requirements. In Experiment 2, the above-mentioned steps were performed sequentially on three waterproof membrane layers. In each test, the fatigue testing machine was set with the following parameters: median displacement 5 mm, amplitude 2 mm, frequency 5 Hz, sinusoidal loading, and 10,000 cycles. With 10,000 cycles, pink spots appeared in area 111 of the first waterproof membrane layer at the 78,540th cycle, the second waterproof membrane layer at the 76,328th cycle, and the third waterproof membrane layer at the 75,680th cycle. Therefore, the integrity fatigue life of the three waterproof membrane layers in this batch is (78,540 + 76,328 + 75,680) / 3 = 76,849, which means this batch does not meet the fatigue performance requirements. It should be noted that different parameter settings on the fatigue testing machine will result in different outcomes. These parameters can be set according to actual requirements, for example, based on the speed of the heavy object passing through; the higher the speed, the higher the parameter value.

[0035] Here, the changes in the force-displacement hysteresis loop can be observed in real time in the fatigue testing machine's data acquisition software. If the hysteresis loop area changes abruptly or the stiffness (load / displacement ratio) decreases significantly, it indicates a malfunction in the testing machine or potential damage to the waterproof coating. In this case, the machine should be stopped and the cause checked. If the testing machine is intact, it is confirmed that the waterproof coating has been damaged. The magnitude of the force applied by the fatigue testing machine can be obtained based on the following relationship: the ratio of the average horizontal force applied to the bridge / ground when an actual heavy object passes over it to the ratio of the actual bridge / ground structure's dimensions to the dimensions of the target structure 13. Furthermore, after S105, the composition and proportions of the non-curing flexible waterproof coating can be redesigned, and steps S101-S106 can be repeated to obtain a non-curing flexible waterproof coating that meets the fatigue performance requirements.

[0036] In this embodiment, the fatigue performance testing device 10 for non-curing flexible waterproof coatings may include: a support 11, a cylinder 12, and a target structure 13. A first region 111 on the upper surface of the support 11 may display a first color. The receiving cavity inside the cylinder 12 may hold a target liquid with a second color. A first target body 131 and a second target body 132 are stacked inside the cylinder 12. The first target body 131 has a fluid channel 1311 corresponding to the first hole 121 at the bottom of the cylinder 12, so that the receiving cavity, the first target body 131, and the second target body 132 are stacked together. The overlapping seam, the fluid channel 1311 of the first target body 131, and the first hole 121 form a connecting path. A non-curing flexible waterproof coating is applied to the annular connecting area 133 around the first target body 131 and the second target body 132 to form a waterproof membrane. During the reciprocating motion of the second target body 132 towards and away from the first target body 131, if the waterproof membrane is damaged, the first color of the first area 111 mixes with a second color, allowing for rapid assessment of the waterproof performance of the non-curing flexible waterproof coating by observing the color displayed in the first area 111. Because the driving mechanism drives the second target body 132, it dynamically simulates the cyclic dynamic load parallel to the surface of the concrete substrate, thereby improving the accuracy of the fatigue performance test results for the non-curing flexible waterproof coating.

[0037] In some embodiments, the distance between the cylinder 12 and the first region 111 is close to or equal to zero so that the two fit together, and the thickness portion of the bracket 11 corresponding to the first region 111 is made of a light-transmitting material.

[0038] Here, the color of the first region 111 can be confirmed visually or by image acquisition on the side of the support 11 facing away from the first region 111 (such as the bottom surface side of the support 11). Because the cylinder 12 and the first region 111 are in close contact, the distance between the first hole 121 and the first region 111 is short enough that even with minimal damage to the waterproof membrane, a trace amount of target liquid entering the first hole 121 can flow to the first region 111 and change its color. In other words, the droplets formed by the reduced amount of target liquid are insufficient to fall into the first region 111 and change its color. This further improves the accuracy of the fatigue performance test results for non-curing flexible waterproof coatings.

[0039] In some embodiments, the periphery of the two ends of the first target body 131 and the second target body 132 that are close to each other are provided with inclined surfaces so that an annular groove with a concave cross section is formed between them.

[0040] Here, during the application of waterproof coating in the annular connection area 133, the groove lacks a supporting base, causing the waterproof coating to flow downwards under its own weight. Consequently, the thickness of the waterproof coating in the groove is less than in other areas, creating a weak point. This allows for the detection of weaknesses in the waterproof membrane, realistically simulating weak points present in actual engineering projects.

[0041] In some embodiments, see Figures 3 to 6 As shown, the test apparatus 10 may further include: a functional structure 14, which is connected to the first target body 131 and the second target body 132. The second target body 132 moves along the functional structure 14, and the functional structure 14 restricts the relative movement distance of the first target body 131 and the second target body 132 in the radial direction of the cylinder 12 to be less than the movement distance of the second target body 132 in the axial direction of the cylinder 12.

[0042] In other words, the second target body 132 can move upward along the functional structure 14 away from the first target body 131 under the action of the driving mechanism, or it can move downward along the functional structure 14 to approach the first target body 131, thereby realizing the reciprocating up and down movement of the second target body 132 relative to the first target body 131. This simulates the detection of cyclic loads along the extension direction of the bridge deck and ground when heavy objects pass through the bridge deck and ground in actual engineering. In this process, the functional structure 14 forms a motion guide for the second target body 132. At the same time, since the relative movement distance between the first target body 131 and the second target body 132 in the radial direction of the cylinder 12 is less than the movement distance of the second target body 132 in the axial direction of the cylinder 12, there is a gap between the functional structure 14 and the first target body 131 and the second target body 132, so as to reduce the phenomenon of the second target body 132 getting stuck under the guiding action.

[0043] In some embodiments, see Figure 1 , Figures 3 to 6 As shown, the first target body 131 is provided with a plurality of first channels 1312 around its axis; the second target body 132 is provided with a plurality of second channels 1322 around its axis, and the plurality of second channels 1322 are respectively positioned opposite to the plurality of first channels 1312; the functional structure 14 includes: a plurality of first functional rods 141, the first functional rods 141 are slidably inserted into the first channels 1312 and the second channels 1322 that are positioned opposite each other, and the distance between the first functional rods 141 and the inner wall of the first channel 1312 and the distance between the first functional rods 141 and the inner wall of the second channel 1322 are both less than the distance the second target body 132 moves upward.

[0044] The first functional rod 141 (such as a stainless steel rod) is slidably inserted into the first channel 1312 and the second channel 1322, so that the second target body 132 can reciprocate along the first functional rod 141, so that the first functional rod 141 has a guiding function. Since the distance between the first functional rod 141 and the inner wall of the first channel 1312 and the distance between the first functional rod 141 and the inner wall of the second channel 1322 are both less than the upward movement distance of the second target body 132, the relative movement distance of the first target body 131 and the second target body 132 in the radial direction of the cylinder 12 is less than the movement distance of the second target body 132 in the axial direction of the cylinder 12. This reduces the movement jamming of the second target body 132 without affecting the sliding of the second target body 132. At the same time, the first functional rod 141 can also reduce the possibility of relative deflection of the first target body 131 and the second target body 132.

[0045] The first channel 1312 and the second channel 1322 connected by the same first functional rod 141 can be two blind holes arranged opposite each other, or two through holes arranged opposite each other, or one can be a blind hole and the other a through hole. Multiple first channels 1312 can be arranged at equal intervals or at non-equal intervals.

[0046] The first functional rod 141 can be fixedly connected to the first target body 131 or the second target body 132 to reduce assembly steps and improve assembly efficiency.

[0047] In this embodiment, the structure of the first channel 1312, the second channel 1322 and the first functional rod 141 is simple and easy to mass-produce. The first functional rod 141 has a guiding function, an anti-jamming function and an anti-deflection limiting function, so as to reduce the number of structures in the test device 10.

[0048] In some embodiments, the first functional lever 141 protrudes from the side of the second target body 132 opposite to the first target body 131 and can be connected to a power source, and the first functional lever 141 can generate heat when powered on. Here, the second channel 1322 is a through hole, allowing the first functional lever 141 to protrude from the side of the second target body 132 opposite to the first target body 131 and be connected to a power source.

[0049] In this way, before the driving mechanism drives the second target body 132 to reciprocate, the temperature of the first target body 131 and the second target body 132 can be raised by energizing the first target body 131 and the second target body 132. Then, during the driving process of the driving mechanism, the presence of the target liquid causes the temperature of the target structure 13 to gradually decrease, so as to simulate the stress generated by the concrete matrix on the waterproof coating under thermal expansion and contraction, so that the test results are more realistic and accurate.

[0050] In some embodiments, the functional structure 14 may further include: a plurality of second functional rods, each connected to the inner bottom wall of the cylinder 12 and arranged around the first target body 131, wherein the distance between the second functional rod and the first target body 131 opposite to it is less than the distance the second target body 132 moves upward. Here, the second functional rods may be arranged parallel to the first functional rod 141, and the second functional rods may form positioning posts for assembling the first target body 131, so that the first target body 131 is assembled along the plurality of second functional rods, and after assembly, the fluid channel 1311 of the first target body 131 is positioned opposite to and connected to the first hole 121, thereby improving its assembly efficiency.

[0051] Here, the height of the second functional rod (such as a stainless steel rod) can be less than the height of the first functional rod 141 to reduce the material used for the second functional rod. Alternatively, the height of the second functional rod can be greater than the height of the first functional rod 141, and it can protrude from the side of the second target body 132 facing away from the first target body 131. The exposed part can be connected to a power source to heat the second functional rod, thereby heating the target liquid and incorporating changes in ambient temperature into the detection setup, which can further improve the accuracy of the detection results.

[0052] Furthermore, the second functional rod can have a positioning hole with internal threads, which is positioned opposite to the non-fixed flexible waterproof coating of the first target body 131. A positioning pin with external threads can be fitted and connected to the internal threads of the positioning hole under rotational force, thus compressing the non-fixed flexible waterproof coating. This reduces the probability of displacement of the first target body 131 during the up-and-down movement of the second target body 132, thereby making the detection results more accurate. Simultaneously, compressing the non-fixed flexible waterproof coating reduces the probability of displacement, further improving the accuracy of the detection results. Additionally, when the second functional rod is connected to a power source and generates heat, the positioning pin can conduct heat to the non-fixed flexible waterproof coating, simulating the thermal expansion of the non-fixed flexible waterproof coating.

[0053] In some embodiments, see Figure 1 As shown, both the first target body 131 and the second target body 132 are cylinders, and the axis of the first target body 131, the axis of the second target body 132 and the axis of the cylinder 12 coincide. Thus, the target structure 13 is centrally positioned within the cylinder 12, ensuring that the pressure of the target liquid within the cylinder 12 is consistent across different positions at the same height of the waterproof membrane layer. This effectively simulates the stress experienced by the road surface or bridge deck on the same cross-section along its extension direction from the passage of heavy objects in a direction parallel to the road surface or bridge deck. Furthermore, both the first target body 131 and the second target body 132 are cylindrical, and the axes of the first target body 131, the second target body 132, and the cylinder 12 are aligned, making their peripheries coplanar. This simulates the smoothness of the road surface or bridge deck. Simultaneously, when the target structure 13 is axially stretched (i.e., the second target body 132 reciprocates), the joint between the first target body 131 and the second target body 132 experiences a combined stress of uniform circumferential tension and interlayer shear, which is highly consistent with the stress state of the waterproof coating in actual engineering. This overcomes the defect of localized stress concentration in the target structure 13 itself causing deviations in the test results.

[0054] In some embodiments, the axes of the first target body 131, the second target body 132, and the cylinder 12 coincide, and the radial dimension of one of the first target body 131 and the second target body 132 gradually increases away from the other, while the other is a cylinder. Thus, the target structure 13 is centrally located within the cylinder 12, ensuring that the pressure of the target liquid within the cylinder 12 on different positions at the same height of the waterproof membrane layer tends to be consistent. This allows for a realistic simulation of the force exerted on the same cross-section of the road surface or bridge deck in its extension direction by heavy objects passing through in a direction parallel to the road surface or bridge deck. Furthermore, the radial dimension of one of the first target body 131 and the second target body 132 gradually increases away from the other, while the other is a cylinder; that is, the radial dimensions at the stacked location of the first target body 131 and the second target body 132 can be substantially the same (including absolute). (The grooves are consistent or relatively consistent as described above), one of which is a cylinder, and the other can gradually increase in size away from the cylinder, so that the target structure 13 can simulate the setting of rising or falling road surface or bridge surface. At the same time, when the target structure 13 is axially stretched (i.e., the second target body 132 reciprocates), the joint of the first target body 131 and the second target body 132 bears the combined stress of uniform circumferential tension and interlayer shear, which is highly consistent with the stress state of waterproof coating in actual engineering, and overcomes the defect of local stress concentration of the target structure 13 itself causing deviation in the test results.

[0055] In some embodiments, the inner wall of the fluid channel 1311 is coated with a hydrophobic layer. The hydrophobic layer can reduce the possibility of target liquid remaining in the fluid channel 1311, thereby reducing the possibility of errors in the detection results. This is especially true when the size of the test device 10 is small, making the size of the fluid channel 1311 even smaller, and this setting can improve the accuracy of the detection results.

[0056] In some embodiments, the first region 111 is provided with white test paper to make the first color white; the target liquid is an aqueous solution of carmine to make the second color red.

[0057] The white test paper can be a medium-speed qualitative or quantitative filter paper; the target liquid can be food-grade carmine (chemical name: trisodium 1-(4'-sulfonyl-1'-naphthazo)-2-naphthol-6,8-disulfonic acid, molecular formula: C64). 20 H 11 N2Na3O 10 A 4.9%-5.1% aqueous solution of S3·1.5H2O is prepared, which is a deep red (i.e., the second color) at this concentration, so as to form a strong color contrast with the white of the white test paper, making it easy to confirm.

[0058] In this embodiment, carmine is a water-soluble azo dye with a molar extinction coefficient as high as 2.5 × 10⁻⁶. 4 L·mol -1 ·cm -1 The lowest detectable concentration on white filter paper is about 0.001%, and the theoretical minimum detectable leakage is about 0.003 mL, which can give a clear damage signal at the very early stage of micro-cracks in the waterproof membrane, eliminating the subjective error of visual inspection.

[0059] Second aspect This disclosure provides a method for testing the fatigue performance of a non-curing flexible waterproof coating, applied to the test apparatus 10 of any embodiment of the first aspect, the test method comprising: S101: Apply a non-curing flexible waterproof coating to the annular connection area 133 to form a waterproof membrane layer; S102: Inject a target liquid with a height greater than the waterproof membrane layer into the cylinder 12; S103: The second target body 132 is driven to move up and down relative to the first target body 131 through the drive mechanism; S104: After the target time, determine whether the color displayed in the first area 111 is the target color. The target color is a mixture of the first color and the second color. S105: If so, the fatigue performance of the waterproof membrane does not meet the requirements; S106: If not, the fatigue performance of the waterproof membrane layer meets the requirements.

[0060] In this embodiment, the waterproof performance of the non-curing flexible waterproof coating can be quickly determined by the color displayed in the first area 111.

[0061] In some embodiments, the following may be included after S106: S107: After the drive mechanism stops driving for a period of time, S103-S106 will be executed again; S108: Execute S107 multiple times.

[0062] The duration for which the drive mechanism stops driving each time can be the same or different; for example, the duration for which the drive mechanism stops driving each time can be equal to the target time. The magnitude of the driving force applied by the drive mechanism each time can be the same or different. When the magnitude of the driving force is different, the movement speed of the second target body 132 is different, so as to simulate the situation of a heavy object moving at different speeds.

[0063] In this embodiment, the drive mechanism operates periodically to enable the detection of the integrity / waterproofness of the waterproof coating under periodic cyclic displacement loads, thereby making the detection process more realistic and the detection results more accurate.

[0064] In some embodiments, after the second target body 132 is driven to move up and down relative to the first target body 131 by the driving mechanism, the method further includes: adjusting the temperature of the environment in which the test device 10 is located.

[0065] Here, adjusting the temperature of the environment where the test device 10 is located can be achieved by adjusting the temperature of the test chamber where the test is conducted, or by connecting the power supply to the first functional lever 141 mentioned above, or by connecting the power supply to the second functional lever mentioned above, or by adjusting multiple of the three simultaneously.

[0066] In this embodiment, the temperature of the environment where the test device 10 is located can be adjusted in different ways to simulate the repeated thermal expansion and contraction of the concrete matrix structure caused by the diurnal temperature difference and seasonal temperature difference, resulting in periodic relative displacement at the structural joints, so as to further improve the accuracy of the test results.

[0067] It should be noted that the test apparatus in the test method provided in this disclosure is similar to the test apparatus embodiments described above, and has similar beneficial effects. For technical details not disclosed in the test method embodiments of this disclosure, please refer to the description of the test apparatus embodiments in this disclosure for understanding; they will not be repeated here.

[0068] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0069] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner.

Claims

1. A fatigue performance testing device for non-curing flexible waterproof coatings, characterized in that, include: A bracket having a first region on its upper surface, the first region having a first color; A cylindrical body is disposed above the support, and a first hole is provided at its bottom, which is opposite to the first area. The cylindrical body is used to hold a target liquid with a second color. The target structure includes: a first target body and a second target body. The lower surface of the first target body is attached to the inner bottom wall of the cylinder and fixed relative to the cylinder. The first target body is provided with a fluid channel that runs through its upper and lower surfaces and is opposite to the first hole. The second target body is stacked on the upper surface of the first target body. The upper end of the second target body is provided with a connecting part. The connecting part is used to connect with a drive mechanism that drives the second target body to move up and down reciprocally. The target structure has an annular connecting region located within the target liquid on its periphery. One end of the annular connecting region is located in the first target body and the other end is located in the second target body along the axial direction of the cylinder. The annular connecting region is used to connect a non-curing flexible waterproof coating.

2. The experimental apparatus according to claim 1, characterized in that, Also includes: A functional structure is connected to the first target body and the second target body. The second target body moves along the functional structure, and the functional structure restricts the relative movement distance between the first target body and the second target body in the radial direction of the cylinder to be less than the movement distance of the second target body in the axial direction of the cylinder.

3. The experimental apparatus according to claim 2, characterized in that, The first target body has multiple first channels arranged around its axis; The second target body has multiple second channels arranged around its axis, and the multiple second channels are respectively positioned opposite to the multiple first channels; The functional structure includes: a plurality of first functional rods, the first functional rods being slidably inserted into a first channel and a second channel with opposite positions, and the distance between the first functional rod and the inner wall of the first channel and the distance between the first functional rod and the inner wall of the second channel are both less than the distance the second target body moves upward.

4. The experimental apparatus according to claim 3, characterized in that, The functional structure further includes: a plurality of second functional rods, each of which is connected to the inner bottom wall of the cylinder and is arranged around the first target body, and the distance between the second functional rod and the first target body opposite it is less than the distance the second target body moves upward.

5. The experimental apparatus according to claim 1, characterized in that, Both the first target body and the second target body are cylinders, and the axis of the first target body, the axis of the second target body, and the axis of the cylinder coincide.

6. The experimental apparatus according to claim 1, characterized in that, The axes of the first target body, the second target body, and the cylinder coincide, and the radial dimension of one of the first target body and the second target body gradually increases in the direction away from the other, and the other is a cylinder.

7. The experimental apparatus according to claim 1, characterized in that, The inner wall of the fluid channel is coated with a hydrophobic layer.

8. The test apparatus according to claim 1, characterized in that, The first area is provided with white test paper so that the first color is white; The target liquid is an aqueous solution of carmine, so as to make the second color red.

9. A method for testing the fatigue performance of a non-curing flexible waterproof coating, applied to the test apparatus according to any one of claims 1-8, characterized in that, The test method includes: A non-curing flexible waterproof coating is applied to the annular connection area to form a waterproof membrane layer; Inject a target liquid into the cylinder with a height greater than that of the waterproof membrane layer; The second target body is driven to move up and down reciprocally relative to the first target body by a drive mechanism; After the target time, determine whether the color displayed in the first area is the target color, wherein the target color is a mixture of the first color and the second color; If so, then the fatigue performance of the waterproof membrane layer does not meet the requirements; If not, then the fatigue performance of the waterproof membrane layer meets the requirements.

10. The test method according to claim 9, characterized in that, After the second target body is driven to move up and down relative to the first target body by the driving mechanism, the following is also included: Adjust the temperature of the environment in which the test apparatus is located.

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