Repair material and concrete structure durability test device

Abstract

A durability test device for a repair material and a concrete structure comprises a test box, a test piece is placed at the bottom of the test box, and an abrasion device is arranged in the test box; a water level control system and a temperature control system are arranged outside the test box, a water inlet is formed in the side wall of the test box, a water outlet is formed in the bottom wall, and the water level control system is communicated with the water inlet; the side wall of the test box is communicated with a temperature control pipeline; and the temperature control system is communicated with the temperature control pipeline. According to the device and the method, durability research on the repair material and the concrete structure under the freezing-thawing and impact-grinding coupling effect can be realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of testing equipment, in particular to a device for testing the durability of repair materials and concrete structures. Background Art

[0002] Most of my country's hydropower projects are located in high mountain canyons. The common characteristics of these projects in terms of flood discharge and energy dissipation are "high head, large flow, large flood discharge power, narrow river valley, and complex geological conditions". The resulting problems of flood discharge and energy dissipation protection, vibration, abrasion, freeze-thaw, etc. have always been one of the difficulties in the design and operation of hydropower projects.

[0003] Many hydropower projects that utilize underflow energy dissipation have experienced damage to stilling basins, necessitating specialized repair measures. When repairing damaged hydraulic concrete structures, achieving optimal results requires materials with not only excellent mechanical properties but also high resistance to freezing and abrasion. Therefore, to ensure the safe and reliable operation of stilling basin structures, repair materials must be tested prior to actual deployment.

[0004] The concrete rapid freeze-thaw test chambers and steel ball abrasion testers currently available for indoor testing can only control single freeze-thaw and single abrasion environmental factors, and cannot accurately simulate the durability of energy dissipation pool repair materials and concrete structures under the coupled effects of freeze-thaw and abrasion in actual projects. Utility Model Content

[0005] The utility model provides a repair material and concrete structure durability test device to solve the problem that the current test device can only realize simulation under a single environmental factor.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A device for testing the durability of repair materials and concrete structures, comprising a test box, a test piece placed at the bottom of the test box, and an abrasion device provided in the test box;

[0008] A water level control system is provided outside the test box, a water inlet is provided on the side wall of the test box, a water outlet is provided on the bottom wall, and the water level control system is connected to the water inlet;

[0009] A temperature control system is further provided outside the test box, a side wall of the test box is connected to a temperature control pipe, and the temperature control system is connected to the temperature control pipe.

[0010] Furthermore, the test box includes a box body and a box cover, and the abrasion device includes a stirring device fixed on the box cover and a plurality of steel balls placed in the box body, and the steel balls are placed on the surface of the test piece.

[0011] Further, the stirring device comprises a driving shaft, a driving source and a plurality of stirring rods arranged around the driving shaft.

[0012] Further, the temperature control system comprises a refrigeration device and a temperature sensor, the refrigeration device comprises a compressor and a condenser arranged outside the test box, one end of the temperature control pipeline is in communication with the inside of the test box, and the other end is connected with the condenser.

[0013] The temperature sensor is fixed to the inner wall of the box body.

[0014] Further, the temperature control system comprises an infrared device, the infrared device comprises a plurality of infrared lamps, and the infrared lamps are fixed to the inner wall of the test box.

[0015] Further, the infrared device further comprises an infrared reflecting plate, the infrared reflecting plate is arranged between the infrared lamps and the inner wall of the test box, and the infrared lamps are irradiated towards the test piece.

[0016] Further, the water level control system comprises a water tank and a water pump arranged outside the test box, the water outlet end of the water pump is connected with a water injection pipe, and the water injection pipe penetrates through the water inlet and extends into the test box.

[0017] The water level control system further comprises a liquid level sensor fixed to the inner wall of the test box.

[0018] Further, the outer wall of the test box is provided with a heat preservation layer.

[0019] The utility model can achieve the following beneficial effects:

[0020] 1, the test device of the application adds water to the test box by using the water level control system, simulates the water flow erosion environment of the repair material and the concrete structure in the natural environment by using the erosion device, and simulates the freeze-thaw environment and the icing and thawing environment by using the temperature control system, so as to realize the durability test of the repair material and the concrete structure under the coupling action of freeze-thaw and erosion.

[0021] 2, the destruction mechanism of the stilling basin structure under the cold and water flow erosion environment is clear, and the durability test of the test piece by using the test device of the application provides strong technical support for the correct design and preparation of high-durability stilling basin repair materials under the cold and water flow erosion environment. DRAWINGS

[0022] The utility model will be further described below in combination with the drawings and examples:

[0023] Figure 1 It is the plane schematic view of the repair material and the concrete structure durability test device of the utility model. It is the plane schematic view of the repair material and the concrete structure durability test device of the utility model.

[0024] The components represented by the reference numerals in the drawings are listed as follows:

[0025] 1. test box; 11. box body; 111. water inlet; 112. water outlet; 12. box cover; 13. water outlet pipe; 14. water pipe valve; 2. stirring device; 21. driving shaft; 22. driving source; 23. stirring rod; 3. steel ball; 4. water level control system; 41. water tank; 42. water pump; 43. water filling pipe; 5. refrigeration device; 51. compressor; 52. condenser; 53. temperature control pipeline; 6. infrared device; 61. infrared lamp; 62. infrared reflector;

[0026] 100. repair material; 200. concrete structure. DETAILED DESCRIPTION

[0027] For the purpose of facilitating the understanding of the present application, the present application will be described in more detail below with reference to the relevant drawings. The embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0028] As shown in Figure 1 A repair material and concrete structure durability test device includes a test box 1, a water level control system 4, a temperature control system, and an abrasion device arranged in the test box 1. The test box 1 is made of low-temperature-resistant and wear-resistant materials, such as steel plates and the like. An insulation layer is arranged outside the test box 1, for example, foamed cotton is used as the filling material of the insulation layer.

[0029] The test box 1 includes a box body 11 and a box cover 12. A water inlet 111 is formed in the side wall of the box body 11, and a water outlet 112 is formed in the bottom wall. The water outlet 112 is connected to a water outlet pipe 13, and the water outlet pipe 13 is provided with a water pipe valve 14 for controlling the opening and closing of the water outlet pipe 13. The water level control system 4 is connected to the inside of the test box 1 through the water inlet 111.

[0030] The abrasion device includes a stirring device 2 fixed on the box cover 12 and a plurality of steel balls 3 placed in the box body 11. During the durability test of the test piece, the repair material 100 and the concrete structure 200 are placed at the bottom of the box body 11, and the repair material 100 is located on the upper surface of the concrete structure 200. A plurality of steel balls 3 are placed on the surface of the test piece and in contact with the repair material 100. The steel balls 3 are solid steel balls 3 made of wear-resistant and low-temperature-resistant stainless steel materials. The size and number of the steel balls 3 can be selected according to relevant specifications and test requirements.

[0031] The stirring device 2 comprises a driving shaft 21, a driving source 22 and a plurality of stirring rods 23 arranged around the side of the driving shaft 21, the driving source 22 is fixed on the box cover 12 and is used to drive the driving shaft 21 to rotate around the axis thereof, and in turn drives the plurality of stirring rods 23 to rotate, so as to realize stirring, thereby driving the plurality of steel balls 3 to move and forming impact and grinding on the surface of the test piece; wherein the stirring rod 23 is made of stainless steel material which is wear-resistant and low-temperature-resistant. The erosion device is used to simulate the impact and grinding environment of the stilling basin structure in the actual project by water flow and foreign matters.

[0032] The water level control system 4 comprises a water tank 41 arranged outside the test box 1 and a water pump 42, the water outlet end of the water pump 42 is connected with a water injection pipe 43, the water injection pipe 43 penetrates through the water inlet 111 and extends into the test box 1, and is used to inject water into the test box 1, and a liquid level sensor is further fixed on the inner wall of the test box 1 and is used to monitor the water level height in the test box 1 in real time. Wherein, the water pump 42 and the liquid level sensor are electrically connected with the computer control system, and are used to automatically adjust the water level height in the test box 1.

[0033] The temperature control system comprises a refrigeration device 5, an infrared device 6 and a temperature sensor, the temperature sensor is fixed on the inner wall of the box body 11 and is used to monitor the temperature in the box body 11; the refrigeration device 5 is used to simulate the frost heaving environment of the test piece, the infrared device 6 is used to simulate the ice melting environment under the natural sunlight condition, and the refrigeration device 5 and the infrared device 6 are alternately used.

[0034] The infrared device 6 comprises a plurality of infrared lamps 61 fixed on the inner wall of the test box 1 and an infrared reflecting plate 62 arranged between the infrared lamps 61 and the inner wall of the test box 1, the infrared lamps 61 are irradiated towards the test piece, and the infrared reflecting plate 62 can reflect the infrared rays, so that the light emitted by the infrared lamps 61 is as efficiently as possible irradiated to the surface of the test piece. The infrared device 6 is connected with the computer control system, and the computer program can control the infrared lamps 61 to emit different radiation intensity and radiation time.

[0035] The refrigeration device 5 comprises a compressor 51 and a condenser 52 arranged outside the test box 1, and a temperature control pipeline 53 is further arranged in communication with the side wall of the box body 11, one end of the temperature control pipeline 53 is in communication with the inside of the test box 1, and the other end is connected with the condenser 52, and in turn the refrigeration device 5 can simulate the icing environment under the severe cold environment in the test box 1. The refrigeration device 5 and the temperature sensor are electrically connected with the computer control system, and can automatically monitor and adjust the temperature in the test box 1.

[0036] The operating principle of the durability testing device for repair materials and concrete structures of the present application is as follows: After placing a test specimen in a test chamber 1, close the chamber lid 12. Turn on the water level control system 4 to set the water level in the chamber 11. Close the water pipe valve 14, start the water pump 42, and inject water into the chamber 11. The water level in the chamber 11 is monitored and controlled in real time by a liquid level sensor. When the water level reaches the set height, injection stops, and the water level should be higher than the surface of the specimen.

[0037] After the water injection is completed, the rotation speed of the driving source 22 is set, the abrasion device is turned on, and the specimen is abraded for a cumulative 72 hours before the driving source 22 is turned off.

[0038] Subsequently, the temperature control system is turned on. After the water surface in the test chamber 1 freezes to a suitable thickness and the ice layer is completely frozen, the refrigeration device 5 is kept running for one hour and then turned off. The infrared lamp 61 is turned on to increase the temperature in the test chamber 1 so that the ice surface melts, thereby simulating the freezing and melting process of concrete in a natural environment.

[0039] According to the test needs, the impact grinding time and the number of concrete freeze-thaw cycles are adjusted to simulate different actual engineering environments. When the specimen impact grinding reaches the set time, usually after 72 hours of cumulative impact grinding, the specimen is tested once. Or when the concrete freeze-thaw cycles reach the set number, usually after every 25 freeze-thaw cycles, the specimen is tested once. The time and number of tests can also be determined according to the wear resistance and frost resistance of the concrete.

[0040] The freeze-thaw and abrasion tests can be stopped if one of the following two situations occurs: freeze-thaw reaches the predetermined number of cycles, abrasion reaches the set time, or the mass loss rate reaches 5% or above.

[0041] During the above test, the environmental parameters of test chamber 1 were set based on actual monitoring data from the stilling basin project. A temperature control system was used to simulate a natural freeze-thaw environment, with the temperature inside test chamber 1 controlled within a range of -20°C to 10°C. A liquid level sensor was used to control the liquid level inside test chamber 1, which was generally 165mm higher than the upper surface of the specimen. Infrared lamps 61 were used to emit different radiation intensities, with the daily radiation control range of 15 to 25MJ·m 2 .

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for testing the durability of repair materials and concrete structures, characterized by: The invention comprises a test box (1), a test piece is placed at the bottom of the test box (1), and an abrasion device is provided in the test box (1); A water level control system (4) is provided outside the test box (1), a water inlet (111) is provided on a side wall of the test box (1), a water outlet (112) is provided on a bottom wall, and the water level control system (4) is in communication with the water inlet (111); A temperature control system is also provided outside the test box (1), and a temperature control pipe (53) is connected to the side wall of the test box (1), and the temperature control system is connected to the temperature control pipe (53).

2. The device for testing the durability of repair materials and concrete structures according to claim 1, characterized in that: The test box (1) comprises a box body (11) and a box cover (12); the abrasion device comprises a stirring device (2) fixed on the box cover (12) and a plurality of steel balls (3) placed in the box body (11); the steel balls (3) are placed on the surface of the test piece.

3. The device for testing the durability of repair materials and concrete structures according to claim 2, characterized in that: The stirring device (2) comprises a driving shaft (21), a driving source (22), and a plurality of stirring rods (23) arranged around the driving shaft (21). The driving source (22) is used to drive the driving shaft (21) to rotate around its own axis.

4. The device for testing the durability of repair materials and concrete structures according to claim 2, characterized in that: The temperature control system includes a refrigeration device (5) and a temperature sensor. The refrigeration device (5) includes a compressor (51) and a condenser (52) arranged outside the test box (1). One end of the temperature control pipe (53) is connected to the interior of the test box (1) and the other end is connected to the condenser (52). The temperature sensor is fixed to the inner wall of the box (11).

5. The device for testing the durability of repair materials and concrete structures according to claim 1, characterized in that: The temperature control system includes an infrared device (6), the infrared device (6) includes a plurality of infrared lamps (61), and the infrared lamps (61) are fixed on the inner wall of the test box (1).

6. The device for testing the durability of repair materials and concrete structures according to claim 5, characterized in that: The infrared device (6) further includes an infrared reflective plate (62), which is disposed between the infrared lamp (61) and the inner wall of the test box (1), and the infrared lamp (61) irradiates toward the test piece.

7. The device for testing the durability of repair materials and concrete structures according to claim 1, characterized in that: The water level control system (4) comprises a water tank (41) and a water pump (42) arranged outside the test box (1); the water outlet of the water pump (42) is connected to a water injection pipe (43); the water injection pipe (43) passes through the water inlet (111) and extends into the test box (1); The water level control system (4) further comprises a liquid level sensor fixed to the inner wall of the test box (1).

8. The device for testing the durability of repair materials and concrete structures according to claim 1, characterized in that: The outer wall of the test box (1) is provided with a thermal insulation layer.

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