Concrete abrasion resistance testing device

Abstract

The utility model relates to a concrete abrasion resistance test device which comprises a test carrier, and a sand box, a filter box and a water tank which are at least partially communicated are arranged in the test carrier; the test block fixing table is positioned obliquely above the sand box, a plurality of test blocks and reference test blocks are fixed on the test block fixing table through a clamp, and the test blocks and the reference test blocks are positioned in water or sand water; the nozzle is movably connected above the test block fixing table; the top of the nozzle is connected with a water pipe, and the side facing the sand box is connected with a sand suction pipe entering the sand box; the sand grains are sucked into the nozzle under the driving of high-speed water flow to form sand water; wherein an overflow hole is formed in the top of the sand box and communicated with the filter box, a water outlet of the filter box is communicated with the water tank, and a water pump communicated with the water pipe is arranged in the water tank. A plurality of test blocks and reference test blocks are placed, and punching and grinding results can be compared after testing; the nozzle utilizes the siphon principle to suck and mix sand grains to form sand water to wash and grind a test block washing and grinding surface so as to prevent water path blockage, power stirring is not needed in the sand box, energy consumption is reduced, sand water is recycled, and a water source is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete detection, and more specifically, to a concrete abrasion resistance test device. Background Art

[0002] Ultra-high performance concrete (UHPC) is a new type of cement-based composite material with excellent mechanical properties and durability. However, hydraulic structures are in high-speed water flows for a long time and are repeatedly abraded by high-speed water flows with sand and stones, resulting in very serious erosion and abrasion of the concrete, greatly shortening the service life of the buildings.

[0003] In the prior art, the specimen sample block is usually placed horizontally on one side of the box body, and the mixed sand water is sent to the top of the specimen sample block for abrasion through a high-pressure pump. The above structure has a long water path. In order to ensure that the sand grains in the water do not precipitate, a stirring mechanism needs to be continuously stirred. In addition, during the transportation of the sand water, pipeline blockage events are likely to occur, making it difficult to ensure the continuous progress of the test and unable to achieve the preset test effect. The concrete specimen sample block is only in a water-sand environment, and there is a certain difference between the abrasion method and the actual working conditions, making it difficult to reflect the abrasion resistance of the concrete in actual projects.

[0004] Therefore, how to provide a concrete abrasion resistance test device is an urgent problem to be solved by those skilled in the art. Content of the Utility Model

[0005] For this reason, the purpose of the present utility model is to propose a concrete abrasion resistance test device to solve the problems in the prior art.

[0006] The technical solution of the present utility model is a concrete abrasion resistance test device, including:

[0007] A test carrier, at least part of which inside is a sand box, a filter box and a water tank that are connected;

[0008] A test block fixing table, which is located obliquely above the sand box, and on which multiple test blocks and comparison test blocks are fixed by clamps, and the multiple test blocks and comparison test blocks are in water or sand water;

[0009] A nozzle, which is movably connected above the test block fixing table; a water pipe is connected to the top of the nozzle, and a sand suction pipe that enters the inside of the sand box is connected to the side of the nozzle facing the sand box; sand grains are sucked into the nozzle by the high-speed water flow to form sand water;

[0010] Wherein, an overflow hole is provided at the top of the sand box, the overflow hole is communicated with the filter box, the water outlet hole of the filter box is communicated with the water tank, and a water pump communicated with the water pipe is provided in the water tank.

[0011] According to the technical solution of the present utility model, the nozzle forms an angle of 45° ± 0.5° with the abrasion surfaces of multiple test blocks and the comparison test block, and the distance between the center of the nozzle and the abrasion surfaces of multiple test blocks and the comparison test block is 62 mm ± 2 mm.

[0012] According to the technical solution of the present utility model, the top end of the test block fixing table is an inclined surface, and it is provided with a plurality of test block clamps thereon.

[0013] According to the technical solution of the present utility model, the side surface of the nozzle is provided with a slider. A guide rail is arranged on the top of the sand box along the fixed length direction of multiple test blocks and the comparison test block. The slider is matched with the guide rail, and the slider moves along the guide rail through a driving component to cover the abrasion range to all multiple test blocks and the comparison test block.

[0014] According to the technical solution of the present utility model, the water pipe is provided with a pressure display part.

[0015] According to the technical solution of the present utility model, the water tank is provided with a water shortage protection part.

[0016] According to the technical solution of the present utility model, a first sedimentation chamber, a second sedimentation chamber and a third sedimentation chamber are arranged in the filter box in sequence from the side close to the sand box to the side close to the water tank. A grille is arranged in the first sedimentation chamber, and an overflow hole II is arranged at its top. The overflow hole II is communicated with the second sedimentation chamber. The second sedimentation chamber is provided with an overflow hole III. The overflow hole III is communicated with the third sedimentation chamber. The water outlet hole is located in the upper part of the third sedimentation chamber.

[0017] According to the technical solution of the present utility model, the test block and the comparison test block include three ultra-high performance concrete test blocks and two comparison glass test blocks, and the two comparison glass test blocks are located on both sides of the three ultra-high performance concrete test blocks.

[0018] It can be seen from the above technical solutions that, compared with the prior art, the present utility model has the following beneficial effects:

[0019] The test device provided by the present utility model places multiple test blocks and comparison test blocks simultaneously during the test, and the abrasion results can be compared after the test; when the water level in the sand box is higher than the overflow hole, it enters the filter box for filtration, and then enters the water tank after filtration. The water pump pumps water with a certain pressure into the nozzle according to the test needs. The nozzle uses the siphon principle to suck sand grains and mix them to form sand-water to abrade the abrasion surface of the test block, preventing the waterway from being blocked. At the same time, there is no need for power stirring in the sand box, reducing energy consumption, recycling the sand water, saving water resources, and ensuring the smooth progress of the test.

[0020] Evaluate the wear resistance of concrete materials under the erosion of high-speed sand-laden water flow. The test device simulates the erosion situation in the actual hydraulic environment and provides a reliable test platform for the wear resistance of concrete materials by precisely controlling the erosion conditions (such as erosion angle, distance, time, etc.). Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0022] Figure 1 It is a longitudinal sectional view of a concrete erosion-resistant test device provided by the present invention;

[0023] Figure 2 It is a top view of a concrete erosion-resistant test device provided by the present invention;

[0024] Figure 3 It shows a schematic diagram of the internal structure of the filter box. Detailed Description of the Embodiments

[0025] The following will describe in detail the embodiments of the present invention. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, but should not be construed as a limitation of the present invention.

[0026] There are differences between the existing laboratory-simulated concrete erosion test conditions and the actual working conditions, which will affect the accurate feedback of the test results. For example, the specimen blocks are usually placed horizontally on one side of the box, and the mixed sand water is sent to the top of the specimen blocks for erosion through a high-pressure pump. However, this method requires a stirring mechanism to stir the sand water repeatedly, the sand water conveying pipeline is long, and it is easy to cause waterway blockage, and it cannot truly simulate the erosion under the actual working conditions of concrete, so it is difficult to truly reflect the erosion-resistant performance of concrete in actual projects.

[0027] In view of this, the present invention provides a concrete erosion-resistant test device, see attached Figures 1-3 , including:

[0028] A test carrier for creating a water flow environment containing sand grains and recycling water. It can be a box or a cylinder. At least part of the sand box 1, the filter box 7 and the water tank 8 are connected inside the test carrier;

[0029] The test block fixing table 9 ensures the stability of the test blocks and enables effective testing. The test block fixing table 9 is located diagonally above the sand box 1. Multiple test blocks and comparison test blocks 2 are fixed thereon by clamps. The multiple test blocks and comparison test blocks 2 are in water or sand-water, maintaining a certain testing angle.

[0030] The nozzle 4 evenly grinds and polishes the test blocks. The nozzle 4 is movably connected above the test block fixing table 9. The top of the nozzle 4 is connected to a water pipe 6, and a sand suction pipe 3 that enters the interior of the sand box 1 is connected to the side facing the sand box 1. Sand grains are sucked into the nozzle 4 by the high-speed water flow to form sand-water.

[0031] Among them, the top of the sand box 1 has an overflow hole, the overflow hole is communicated with the filter box 7, the water outlet hole of the filter box 7 is communicated with the water tank 8, and a water pump 81 communicated with the water pipe 6 is provided in the water tank 8.

[0032] In the above technical solution, by using the structure of the test carrier, the water circulation supply is maintained. The sand-water is filtered and then sent to the water tank, preventing the blockage of the pipeline, ensuring the smooth progress of the test. The sand grains are sucked in for mixing by using the siphon principle, without a power mechanism, reducing energy consumption.

[0033] The angle and distance between the nozzle and the multiple test blocks and comparison test blocks 2 will directly affect the impact effect of the water-sand flow. In the present invention, preferably, the nozzle 4 forms an angle of 45°±0.5° with the grinding surfaces of the multiple test blocks and comparison test blocks 2, and the distance between the center of the nozzle 4 and the grinding surfaces of the multiple test blocks and comparison test blocks 2 is 62 mm±2 mm, and the grinding effect is better.

[0034] In this solution, the top end of the test block fixing table 9 is an inclined surface, and it is provided with multiple test block clamps. Among them, the clamp adopts an existing design, and it can stably fix the test block on the test block fixing table 9.

[0035] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0036] The side of the nozzle 4 is provided with a slider. Along the fixed length direction of multiple test blocks and comparison test blocks 2, a guide rail is arranged on the top of the sand box 1. The slider is matched with the guide rail, and the slider moves along the guide rail through a driving component, covering the scouring range to all multiple test blocks and comparison test blocks 2. The driving component can be a motor and a nut-screw structure. The rotation of the motor drives the screw. The slider is equivalent to a nut, driving the nozzle to move along the guide rail. The slide rail ensures that the nozzle can move smoothly to ensure the consistency and repeatability of the test.

[0037] The water pipe 6 is provided with a pressure display part, and the pressure display part can be a pressure gauge.

[0038] In the present utility model, the pressure water provided by the water pump to the nozzle is adjustable, and can be freely adjusted according to the strength and scouring effect of the concrete test block, with a range of 0 - 1 mpa.

[0039] Advantageously, the spray head where the nozzle is located can be adjusted up and down according to the test requirements when arranging the test blocks. The lifting structure can be such that a fixed plate is arranged on the slider, and different mounting holes are provided on the fixed plate. According to the test requirements, the nozzle is installed in the corresponding mounting hole to change the position of the nozzle in the height direction.

[0040] Advantageously, the water tank 8 is provided with a water shortage protection part. When the water in the water tank reaches the lower water level limit, the water pump automatically stops working, thereby protecting the motor. The water shortage protection part can be a water level sensor.

[0041] In the embodiment of the present utility model, a first sedimentation chamber 71, a second sedimentation chamber 72 and a third sedimentation chamber 73 are arranged in the filter tank 7 in sequence from the side close to the sand box 1 to the side close to the water tank 8. A grille is provided in the first sedimentation chamber 71 to filter the overflowing turbid sand water. There is an overflow hole two at its top, and the overflow hole two is communicated with the second sedimentation chamber 72 to perform secondary sedimentation on the filtered water. At this time, the water flow is relatively stable, and finer sand mud can be sedimented compared with the first time. The second sedimentation chamber 72 has an overflow hole three, and the overflow hole three is communicated with the third sedimentation chamber 73. The water outlet hole is located in the upper part of the third sedimentation chamber 73. Finally, the water that has undergone three sedimentations enters the water tank again to form a recycling of water and avoid waste of water.

[0042] The sand box, the filter tank and the water tank are all provided with discharge ports at the bottom, which is beneficial to the discharge of the sediment at the bottom.

[0043] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more unless otherwise specifically defined.

[0044] A test method is provided for the durability detection of ultra-high performance concrete, mainly used for the detection of the abrasion resistance of concrete. The constituent materials of ultra-high performance concrete form the most compact packing with different particle sizes in the best proportion, and the strength is generally above C120 Mpa. It can be regarded as the engineering material with the best durability and has excellent wear resistance and explosion resistance. Therefore, in order to better apply ultra-high performance concrete to bridges, tunnels, high-rise buildings, etc., the present utility model provides a test method for its abrasion resistance based on the above-mentioned concrete abrasion test device, including the following steps:

[0045] S1. Take out the abrasion-resistant test block from the standard curing room, wipe off the surface moisture, mark it, and then take pictures of the abrasion surface with a camera for measuring the abrasion wear volume modeling. The number of pictures taken should be no less than 2 times;

[0046] S2. Place the abrasion-resistant test block on the test block fixing table, adjust the position of the nozzle so that the abrasion surface of the test block forms an angle of 45° ± 0.5° with the nozzle, and the distance between the surface of the abrasion test block and the center of the nozzle is 62 mm ± 2 mm;

[0047] S3. Pour water into the sand box to submerge the test block until the water level reaches the specified height, turn on the water pump, stop the machine after abrasion for 75 min ± 1 min;

[0048] S4. Remove the test block from the test block fixing table, wipe off the surface moisture, and take pictures of the abrasion surface with a camera for measuring the abrasion wear volume modeling. The number of pictures taken should be no less than 2 times;

[0049] S5. After modeling with the abrasion surface data taken by the camera before and after abrasion, calculate the volume of the wear amount by the photogrammetry software. Each test block should have two sets of abrasion surface data for modeling. When the difference between the wear amount volumes calculated by the photogrammetry software is less than 5%, the average value of the two results is taken as the representative value of the wear amount of a single test block; otherwise, the test result is invalid and the test should be carried out again.

[0050] In the present utility model, unless otherwise clearly required and defined, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0051] Among them, each group of test blocks consists of three ultra-high performance concrete test blocks and two comparison glass test blocks. The two comparison glass test blocks are at the head and tail of the five test blocks, and the middle three are a group of concrete test blocks; among them, the glass test blocks are made of glass with a Knoop hardness of 500. The concrete abrasion resistance test blocks should be cast into test blocks with dimensions of 100mm×100mm×35mm in a 100mm cube test mold, or they can be cast into 100mm cubes at one time. After the concrete hardens, it is cut into test blocks with dimensions of 100mm×100mm×35mm using a diamond saw.

[0052] The glass test blocks and the concrete test blocks are subjected to abrasion tests in the same environment, and the abrasion resistance index is used to determine the abrasion resistance of ultra-high performance concrete.

[0053] In the above tests, the water pump should be able to provide a jet of water with a pressure of 0.3MPa (0 - 1MPa) at the nozzle outlet; the diameter of the central nozzle of the nozzle is 20mm±2mm; the test block fixing platform and guide rail: fix the abrasion surface of the test block at a position with an angle of 45°±0.5° to the nozzle and a distance of 62mm±2mm; the abrasive used for abrasion should be quartz sand, and the SiO 2 of quartz sand should be not less than 97%, the Mohs hardness is 7, and the content of particles with a size of 1mm - 4mm is not less than 95%. When the worn volume of the glass test block is reduced to (60±5)% of the worn volume at the first use of the new sand, the quartz sand should be replaced; the sand box should be set at a position that can ensure that 4mm quartz sand particles can be sucked into the water-sand mixture of the jet water to participate in abrasion.

[0054] The ultra-high performance concrete test blocks should be cured under standard conditions in water for 28 days of age. The ultra-high performance concrete cured by conventional steam curing should be placed in water under standard conditions for continued curing until 28 days of age after steam curing. The ultra-high performance concrete cured by high-temperature heat curing to improve performance should be placed in water under standard conditions for continued curing until 7 days of age after high-temperature heat curing ends.

[0055] The calculation and processing of the test results in S5 should meet the following requirements:

[0056] S51. The worn volume of ultra-high performance concrete should be calculated according to the following formula:

[0057]

[0058] In the formula: V U is the average worn volume of ultra-high performance concrete (mm 3 ), accurate to 1mm 3 ;

[0059] V Ui is the worn volume of a single ultra-high performance concrete test block (mm 3 ), accurate to 1mm 3 ;

[0060] If the difference between the maximum or minimum value and the median value exceeds 10% of the median value, the median value shall be taken as the measured value; if both the maximum and minimum values exceed 10% of the median value, the sample shall be prepared again for testing.

[0061] S52. The abrasion volume of the reference glass shall be calculated according to the following formula:

[0062]

[0063] In the formula: V G —— The average abrasion volume of the reference glass (mm 3 ), accurate to 1 mm 3 ;

[0064] V Gi —— The abrasion volume of a single test block of the reference glass (mm 3 ), accurate to 1 mm 3 ;

[0065] When the difference between the maximum and minimum values and the average value exceeds 20% of the average value, the sample shall be prepared again for testing;

[0066] S53. The abrasion resistance index shall be calculated according to the following formula:

[0067]

[0068] In the formula: I —— The abrasion resistance index, accurate to 0.1;

[0069] V U —— The average abrasion volume of the ultra-high performance concrete (mm 3 ), accurate to 1 mm 3 ;

[0070] V G —— The average abrasion volume of the reference glass (mm 3 ), accurate to 1 mm 3 .

[0071] The present utility model calculates the abrasion resistance index by comparing the abrasion volumes of the ultra-high performance concrete test block and the reference glass test block, so as to quantitatively evaluate the wear resistance of the material in the simulated environment. To ensure the accuracy and consistency of the data, measures of retesting are taken for abnormal data. This test device and method provide an effective means for evaluating the durability and wear resistance of concrete materials, which helps to improve the service life and reliability of hydraulic structures in harsh environments.

[0072] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0073] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A concrete abrasion resistance test device, characterized in that: include: A test carrier, wherein the test carrier has a sand box (1), a filter box (7) and a water tank (8) which are at least partially connected; A test block fixing table (9), the test block fixing table (9) is located obliquely above the sand box (1), and a plurality of test blocks and a comparison test block (2) are fixed thereon by means of a clamp, and the plurality of test blocks and the comparison test block (2) are in water or sand water; A nozzle (4), the nozzle (4) being movably connected to the top of the test block fixing platform (9); the top of the nozzle (4) is connected to a water pipe (6), and the side of the nozzle (4) facing the sand box (1) is connected to a sand suction pipe (3) for entering the interior of the sand box (1); sand particles are sucked into the nozzle (4) driven by a high-speed water flow to form sand water; The top of the sand box (1) is provided with an overflow hole, the overflow hole is connected to the filter box (7), the water outlet of the filter box (7) is connected to the water tank (8), and the water tank (8) is provided with a water pump (81) connected to the water pipe (6).

2. A concrete abrasion resistance testing device according to claim 1, characterized in that: The nozzle (4) is at an angle of 45°±0.5° to the grinding surfaces of the multiple test blocks and the comparison test block (2), and the distance between the center of the nozzle (4) and the grinding surfaces of the multiple test blocks and the comparison test block (2) is 62 mm±2 mm.

3. A concrete abrasion resistance testing device according to claim 1, characterized in that: The top of the test block fixing platform (9) is an inclined surface, on which a plurality of test block fixtures are arranged.

4. A concrete abrasion resistance testing device according to claim 1, characterized in that: The side of the nozzle (4) is provided with a slide block, and the top of the sand box (1) is provided with a guide rail along the fixed length direction of the multiple test blocks and the comparison test blocks (2). The slide block cooperates with the guide rail, and the slide block moves along the guide rail through the driving component to cover the punching and grinding range to all the multiple test blocks and the comparison test blocks (2).

5. A concrete abrasion resistance testing device according to claim 1, characterized in that: The water pipe (6) is provided with a pressure display portion.

6. A concrete abrasion resistance testing device according to claim 1, characterized in that: The water tank (8) has a water shortage protection portion.

7. A concrete abrasion resistance testing device according to any one of claims 1 to 6, characterized in that: The filter box (7) is provided with a first sedimentation chamber (71), a second sedimentation chamber (72) and a third sedimentation chamber (73) in sequence from the side close to the sand box (1) to the side close to the water tank (8). The first sedimentation chamber (71) has a grille, and a second overflow hole is provided on the top thereof, and the second overflow hole is connected to the second sedimentation chamber (72). The second sedimentation chamber (72) has a third overflow hole, and the third overflow hole is connected to the third sedimentation chamber (73). The water outlet is located at the upper part of the third sedimentation chamber (73).

8. A concrete abrasion resistance testing device according to any one of claims 1 to 6, characterized in that: The test blocks and comparison test blocks (2) include three ultra-high performance concrete test blocks and two comparison glass test blocks, wherein the two comparison glass test blocks are located on both sides of the three ultra-high performance concrete test blocks.

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