A testing device and method for high performance concrete resistant to chlorides freeze-thaw action

Abstract

The application relates to the technical field of concrete testing, and discloses a high-performance concrete testing method for resisting the action of chloride salt freeze-thaw, which comprises a workbench, a plurality of detection stations are arranged on the workbench, a plurality of sensing control lifting frames are arranged on the two sides of the workbench, a plurality of detection cover plates are arranged on the top of the sensing control lifting frames, the detection cover plates correspond to the positions of the detection stations, in the application, the concrete test sample is placed on the detection station, when the conveying belt conveys the sample to the specified position, the sensing control lifting frame senses the position of the detection station, drives the detection cover plate to move downwards until the cover plate covers the detection station, at this moment, the detection probe is located in the detection station, the internal concrete sample is proportionally detected, and the detection data is uploaded to the transmitter after the detection is completed, so that the purpose of accurately detecting the concrete is achieved.

Description

Technical Field

[0001] This invention relates to the field of concrete testing technology, specifically to a high-performance concrete testing device and method resistant to chloride salt freeze-thaw cycles. Background Technology

[0002] Concrete is a general term for engineering composite materials in which aggregates are bound together by cementing materials. The term "concrete" usually refers to cement concrete, also known as ordinary concrete, which is made by mixing cement as the cementing material, sand and gravel as aggregates, and water (which may contain admixtures and additives) in a certain proportion. It is widely used in civil engineering.

[0003] The most important cause of corrosion damage to coastal concrete buildings and highways is chloride erosion. Chloride ions from the external environment can react with calcium hydroxide and other substances in concrete to form easily soluble calcium chloride and a solid compound with a large amount of water of crystallization that is several times larger in volume than the reactants. This causes the concrete to expand and deteriorate, and its mechanical properties to change. Therefore, the proportion of calcium hydroxide and other substances in concrete is very important. However, traditional concrete production processes rarely test this proportion. Therefore, it is very necessary to design a high-performance concrete testing device that is resistant to chloride freeze-thaw action to solve the above-mentioned technical problems.

[0004] In an infinitely large solid medium, the propagation speed of a longitudinal wave is related to the medium's density, elastic modulus, Poisson's ratio, and other properties. If the elastic modulus of the medium is different, the propagation speed of the sound wave will also be different. Since the elastic modulus is related to the strength of the medium, the propagation speed of the sound wave is indirectly related to the strength of the medium. This is the basic principle of ultrasonic testing for concrete strength.

[0005] Concrete permeability refers to the ease with which liquids, gases, or ions penetrate, diffuse, or migrate within concrete under the influence of pressure, chemical potential, or electric field. It is a key indicator characterizing the density of concrete. Good concrete impermeability means a stronger ability to prevent moisture, ions, etc., from penetrating into the concrete structure, thus better protecting the reinforcing steel and significantly improving the durability of the concrete structure. It is a crucial indicator in the design of concrete structures with high durability requirements. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] To address the shortcomings of the aforementioned technologies, this invention provides a high-performance concrete testing device and method resistant to chloride salt freeze-thaw cycles, which has the advantage of accurate mix proportion detection and solves the problem that existing devices rarely detect concrete mix proportions.

[0008] (II) Technical Solution

[0009] To achieve the goal of accurate detection of the above-mentioned proportions, the present invention provides the following technical solution:

[0010] A high-performance concrete testing device resistant to chloride salt freeze-thaw action includes a workbench 1, on which multiple testing stations 2 are provided. A sensing and control lifting frame 3 is symmetrically arranged on both sides of the workbench 1. Multiple testing cover plates 4 are provided on the top of the sensing and control lifting frame 3, and the testing cover plates 4 correspond to the positions of the testing stations 2.

[0011] Preferably, the workbench 1 is provided with a conveyor belt 5, and the conveyor belt 5 is provided with multiple sets of the detection stations 2, each set of the detection stations 2 having 3 units, and the number of detection cover plates 4 being 3 units.

[0012] Preferably, the sensing and lifting frame 3 includes an electric lifting frame 6 symmetrically arranged on both sides, a controller 7 is provided at the bottom of the electric lifting frame 6, and infrared sensors 8 are provided at both ends of the sensing and lifting frame 3. The infrared sensors 8 cooperate with the controller 7.

[0013] Preferably, the electric lifting frame 6 is provided with a connector 9 at the top, and the connector 9 is fixedly connected to the detection cover plate 4.

[0014] Preferably, the detection cover plate 4 includes a cover plate 10, which corresponds to the position of the detection station 2.

[0015] Preferably, the cover plate 10 is provided with a detection probe 11, which is electrically connected to the transmitter 12.

[0016] Preferably, when the electric lifting frame 6 is at its highest position, the cover plate 10 is located above the detection station 2; when the electric lifting frame 6 is at its lowest position, the cover plate 10 is closed to the detection station 2, and the detection probe 11 is located inside the detection station 2.

[0017] A testing method for a high-performance concrete testing device resistant to chloride salt freeze-thaw action includes the following steps:

[0018] S1. Place the concrete test sample on the testing station 2. When the testing station 2 on the workbench 1 transports the sample to the designated position, the sensing and control lifting frame 3 senses the position of the testing station 2 and drives the testing cover plate 4 to move downward until the testing cover plate 4 closes with the testing station 2, and the sample inside the testing station 2 is tested. When the infrared sensor 8 senses that the testing station 2 has entered the area to be tested, it transmits a command to the controller 7. The controller 7 controls the electric lifting frame 6 to move downward. During the downward movement of the electric lifting frame 6, the connecting piece 9 and the testing cover plate 4 move downward synchronously until the electric lifting frame 6 moves to the lowest position. At this time, the cover plate 10 closes with the testing station 2, and the testing probe 11 is located inside the testing station 2 to perform mix ratio testing on the concrete sample inside.

[0019] S2. After the test is completed, the test data is uploaded to the transmitter 12. At this time, the test process is completed. The controller 7 controls the electric lifting frame 6 to move upward, driving the test cover plate 4 to move upward synchronously until the electric lifting frame 6 moves to the highest position and the cover plate 10 is located above the test station 2. The conveyor belt 5 then transports the test station 2 after the test to the next process for relevant mechanical performance tests. After the mechanical performance tests are completed, the conveyor belt 5 transports the test station after the test to the next station for durability performance tests. The next set of test stations 2 that have not been tested is transported to the corresponding position below the test cover plate 4.

[0020] Compared with the prior art, the present invention provides a high-performance concrete testing device and method resistant to chloride salt freeze-thaw action, which has the following beneficial effects:

[0021] By placing concrete test samples on the testing station, when the conveyor belt transports the samples to the designated position, the sensing and control lifting frame detects the position of the testing station and moves the testing cover plate downwards until the cover plate closes with the testing station. At this time, the testing probe is located inside the testing station and performs mix proportion testing on the concrete sample inside. Subsequently, the main unit and ultrasonic transmitter of the next station will emit ultrasonic waves to test the mechanical properties of the concrete. After the test is completed, the test data is uploaded to the transmitter, thereby achieving the purpose of accurate testing of concrete.

[0022] After the mix proportion test is completed, the conveyor will transfer the concrete test sample to the next station. Each station has a different internal environment, capable of simulating freeze-thaw cycles and conditions such as concrete compression and tensile stress. Testing under different environments yields the mechanical and durability properties of the concrete samples, thus achieving multiple testing objectives for the mix proportion, mechanical properties, and durability of concrete. This device is multi-functional, capable of testing both the mechanical and durability properties of concrete. Attached Figure Description

[0023] Figure 1This is a three-dimensional structural schematic diagram of a high-performance concrete testing device resistant to chloride salt freeze-thaw action according to an embodiment of the present invention.

[0024] Figure 2 This is a front view schematic diagram of a high-performance concrete testing device resistant to chloride salt freeze-thaw action according to an embodiment of the present invention.

[0025] Figure 3 This is a top view schematic diagram of a high-performance concrete testing device resistant to chloride salt freeze-thaw action according to an embodiment of the present invention.

[0026] Figure 4 This is a right-side structural schematic diagram of a high-performance concrete testing device resistant to chloride salt freeze-thaw action according to an embodiment of the present invention.

[0027] In the diagram: 1. Workbench; 2. Inspection station; 3. Sensor-controlled lifting frame; 4. Inspection cover plate; 5. Conveyor belt; 6. Electric lifting frame; 7. Controller; 8. Infrared sensor; 9. Connector; 10. Cover plate; 11. Inspection probe; 12. Transmitter. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figure 1-4 A high-performance concrete testing device resistant to chloride salt freeze-thaw action includes a workbench 1, a testing station 2, a sensor and control lifting frame 3, and a testing cover plate 4.

[0030] The system includes a workbench 1 with multiple testing stations 2. A sensor-controlled lifting frame 3 is symmetrically positioned on both sides of the workbench 1, and multiple testing covers 4 are mounted on top of the lifting frame 3, corresponding to the positions of the testing stations 2. It can test the proportions, mechanical properties, and impermeability.

[0031] Ultrasonic testing instruments typically have two sensors, which are well bonded to the concrete surface via a coupling agent. The main unit sends a short pulse to the transmitting sensor, causing it to vibrate and generate ultrasonic waves. These waves propagate through the concrete and are received by the receiving sensor. The main unit starts timing when it sends a short pulse to the transmitting sensor and stops timing when the receiving sensor receives the ultrasonic wave, thus determining the propagation time of the ultrasonic wave in the concrete. Dividing the distance between the two sensors by the propagation time gives the speed of the ultrasonic wave in the concrete, from which the strength of the concrete can be inferred.

[0032] The steady-state electromigration method was used to test the impermeability of concrete. A 12V DC current was connected at the work station. After the voltage was applied to the specimen, Cl- in the cathode tank containing NaCl solution diffused to the anode. When the current was in a stable state, the change in Cl- concentration in the anode tank was measured to evaluate the permeability of the concrete.

[0033] Specifically, the concrete test sample is placed on the testing station 2. When the testing station 2 on the workbench 1 transports the sample to the designated position, the sensing and control lifting frame 3 senses the position of the testing station 2 and moves the testing cover plate 4 downward until the testing cover plate 4 closes with the testing station 2, and the sample inside the testing station 2 is tested, thereby achieving the purpose of accurately testing the concrete mix ratio and testing the basic mechanical properties and durability of the concrete.

[0034] In order to achieve the purpose of continuous transportation and testing of concrete samples, in the technical solution of this application, the workbench 1 is equipped with a conveyor belt 5, and the conveyor belt 5 is equipped with multiple sets of testing stations 2, each set of testing stations 2 has 3 units, and the number of testing cover plates 4 is 4 units. When the concrete sample in a set of testing stations 2 is tested, the conveyor belt 5 will transport the next set of testing stations 2 to the corresponding position for testing, thereby achieving the purpose of continuous transportation and testing of concrete samples.

[0035] To enable the testing of concrete samples, in the technical solution of this application, the sensing and control lifting frame 3 includes an electric lifting frame 6 symmetrically arranged on both sides. The electric lifting frame 6 has a controller 7 at its bottom and infrared sensors 8 at both ends. The infrared sensors 8 cooperate with the controller 7. The electric lifting frame 6 has a connector 9 at its top. The connector 9 is fixedly connected to the detection cover plate 4. The detection cover plate 4 includes a cover plate 10, which corresponds to the position of the detection station 2. A detection probe 11 is provided on the cover plate 10, and the detection probe 11 is electrically connected to the transmitter 12.

[0036] When the electric lifting frame is at its highest position, the cover plate is located above the testing station. When the electric lifting frame is at its lowest position, the cover plate is closed to the testing station, and the testing probe is located inside the testing station.

[0037] Specifically, when the infrared sensor 8 detects that the detection station 2 has entered the area to be detected, it transmits a command to the controller 7. The controller 7 controls the electric lifting frame 6 to move downwards. During the downward movement of the electric lifting frame 6, the connecting piece 9 and the detection cover plate 4 move downwards synchronously until the electric lifting frame 6 moves to its lowest position. At this time, the cover plate 10 closes with the detection station 2, and the detection probe 11 is located inside the detection station 2 to perform mix proportion testing on the concrete sample inside. After the test is completed, the test data is uploaded to the transmitter 12. At this time, the detection process is completed. The controller 7 then controls the electric lifting frame 6 to move upwards, moving the detection cover plate 4... The electric lifting frame 6 moves upward synchronously until it reaches its highest position, with the cover plate 10 positioned above the testing station 2. The conveyor belt 5 then transports the tested testing station 2 to the next process for mechanical performance testing. After the mechanical performance testing is completed, the conveyor belt 5 transports the tested testing station 2 to the next station for durability testing. The next set of testing stations 2 that have not yet been tested is transported to the corresponding position below the testing cover plate 4 (the controller 7 has been set with a testing time; when the specified time is reached, the controller 7 controls the electric lifting frame 6 to move upward, and the conveyor belt 5 transports the next set of samples).

[0038] By placing concrete test samples on the testing station, when the conveyor belt transports the samples to the designated position, the sensing and control lifting frame detects the position of the testing station and moves the testing cover plate downwards until the cover plate closes with the testing station. At this time, the testing probe is located inside the testing station and performs mix proportion testing on the concrete sample inside. Subsequently, the main unit and ultrasonic transmitter of the next station will emit ultrasonic waves to test the mechanical properties of the concrete. After the test is completed, the test data is uploaded to the transmitter, thereby achieving the purpose of accurate testing of concrete.

[0039] After the mix proportion test is completed, the conveyor will transfer the concrete test sample to the next station. Each station has a different internal environment, capable of simulating freeze-thaw cycles and conditions such as concrete compression and tensile stress. Testing under different environments yields the mechanical and durability properties of the concrete samples, thus achieving multiple testing objectives for the mix proportion, mechanical properties, and durability of concrete. This device is multi-functional, capable of testing both the mechanical and durability properties of concrete.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A test method for a test device for high-performance concrete resistant to chlorine salt freeze-thaw effect, characterized in that, the test device comprises a workbench (1), a plurality of detection stations (2) are arranged on the workbench (1), and symmetrical sensing control lifting frames (3) are arranged on both sides of the workbench (1); a plurality of detection cover plates (4) are arranged on the top of the sensing control lifting frame (3), and the detection cover plates (4) correspond to the positions of the detection stations (2); a conveying belt (5) is arranged on the workbench (1), a plurality of groups of the detection stations (2) are arranged on the conveying belt (5), the number of each group of the detection stations (2) is 3, and the number of the detection cover plates (4) is 3; the sensing control lifting frame (3) comprises symmetrical electric lifting frames (6) arranged on both sides, a controller (7) is arranged on the bottom of the electric lifting frame (6), and infrared sensors (8) are arranged at both ends of the sensing control lifting frame (3); the infrared sensors (8) are matched with the controller (7); a connecting piece (9) is arranged on the top of the electric lifting frame (6), and the connecting piece (9) is fixedly connected with the detection cover plate (4); the detection cover plate (4) comprises a cover plate (10), and the cover plate (10) corresponds to the position of the detection station (2); a detection probe (11) is arranged on the cover plate (10), and the detection probe (11) is electrically connected with a transmitter (12); the test method comprises the following steps: S1, placing a concrete test sample on the detection station (2), when the detection station (2) on the workbench (1) conveys the sample to a specified position; when the infrared sensor (8) senses that the detection station (2) enters a detection area, a transmission instruction is transmitted to the controller (7), the controller (7) controls the electric lifting frame (6) to move downward, in the process that the electric lifting frame (6) moves downward, the connecting piece (9) and the detection cover plate (4) are driven to move downward synchronously until the electric lifting frame (6) moves to the lowest position, at this time, the cover plate (10) covers the detection station (2), and the detection probe (11) is located in the detection station (2) to detect the concrete sample in the detection station (2); S2, when the detection is completed, detection data is uploaded to the transmitter (12), at this time, the detection process is completed, the controller (7) controls the electric lifting frame (6) to move upward, the detection cover plate (4) is driven to move upward synchronously until the electric lifting frame (6) moves to the highest position, the cover plate (10) is located above the detection station (2), the conveying belt (5) conveys the detection station (2) after detection to the next process to detect the mechanical properties, after the mechanical property detection is completed, the conveying belt (5) conveys the detection station after detection to the next station to detect the durability, and the next group of detection stations (2) that have not been detected are conveyed to the positions corresponding to the detection cover plates (4) below.

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