An experimental device for simulating damage of concrete under wave action and a method of using the same

Abstract

The application discloses a kind of test device of simulating concrete damage under wave action and its using method, test device includes test box, water tank, water pump for conveying water and air pump for adjusting wave pressure in test box, the tank wall of test box is equipped with pressurizing port, air outlet and test box water inlet, air outlet is equipped with valve for opening and closing air outlet;The tank bottom of test box is equipped with test box water outlet and telescopic rod, the upper end of telescopic rod is equipped with water level sensor, pressure sensor and humidity sensor;The tank wall of water tank is equipped with water tank water inlet and water tank water outlet, test box water outlet is communicated with water tank water inlet by water pump, water tank water outlet is communicated with the water inlet of test box by water pump;Test box is equipped with controller for controlling air pump, telescopic rod, water level sensor, pressure sensor, humidity sensor, valve, water pump.This application can realize wave pressure and wave suction force on concrete damage effect, can be recycled, simple and convenient operation.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of concrete durability research, and relates to a test device for simulating concrete damage under wave action and a use method thereof. BACKGROUND

[0002] Concrete materials are widely used in port, coastal and offshore engineering and are corroded by harsh marine environment. In addition to the erosion effect of harmful ions such as chloride ions and sulfate ions in seawater and the dissolution effect caused by environmental water, the wave cycle in the marine environment will also significantly damage the concrete and accelerate the corrosion and deterioration of the concrete. Wave action on concrete will produce wave force, including wave pressure and wave suction. During wave motion, the horizontal motion speed of water particles at the wave crest is the largest, and the direction is consistent with the direction of wave propagation. Water accumulation occurs in front of the wave crest, and wave pressure is generated, which will accelerate seawater penetration and increase the depth of harmful ion penetration and dissolution. The horizontal motion speed of water particles at the wave trough is also the largest, and the direction is opposite to the direction of wave propagation. Water loss occurs behind the wave trough, and wave suction is generated, which will cause tensile stress on the surface of the concrete, cause micro-cracks to develop and deteriorate the internal microstructure of the concrete. Under the long-term cycle action of wave force, the damage to the concrete gradually accumulates, and the strength decreases, which will greatly increase the risk of sudden failure of the structure and is not conducive to engineering safety.

[0003] Laboratories often use wave generators to generate waves in water tanks to study the interaction between waves and breakwater engineering structures, but most of them are short-term effects. If this method is used to study the damage to concrete under long-term wave cycle action, it will consume a lot of manpower and material resources, and the applicability is low. The research on marine environment corrosion concrete mainly considers ion erosion and environmental water dissolution, and mostly uses immersion or dry-wet cycle test method, which cannot reflect the damage of wave pressure and wave suction to concrete under wave action. SUMMARY

[0004] The purpose of the present application is to overcome the deficiencies in the prior art and provide a test device for simulating concrete damage under wave action and a use method thereof, which can realize the damage of wave pressure and wave suction to concrete, can be used repeatedly, and is simple and convenient to operate.

[0005] To achieve the above purpose, the present application adopts the following technical scheme:

[0006] The utility model provides an experimental device of simulating concrete damage under wave action, including test box, water tank, water pump for conveying water and air pump for adjusting wave pressure in test box, the tank wall of test box is equipped with pressurizing mouth, exhaust port and test box water inlet, air pump communicates with pressurizing mouth, exhaust port is equipped with valve for opening and closing exhaust port, the tank bottom of test box is equipped with test box water outlet and telescopic link, the upper end of telescopic link is equipped with water level sensor for measuring water level in test box, pressure sensor for measuring pressure in test box and humidity sensor for measuring humidity in test box, the tank wall of water tank is equipped with water tank water inlet and water tank water outlet, test box water outlet communicates with water tank water inlet through water pump, and test tank water inlet communicates with test tank water outlet through water pump, and the controller for controlling air pump, telescopic link, water level sensor, pressure sensor, humidity sensor, valve and water pump is arranged on test tank.

[0007] Optionally, the test box comprises a test box body and a test box cover, the test box cover is connected with the test box body through bolts, and the outer bottom of the test box body is provided with a test box foot.

[0008] Optionally, a sealing ring for sealing the test box is arranged between the test box body and the test box cover.

[0009] Optionally, the inner bottom surface of the test box is provided with an anticorrosion support for placing a concrete sample.

[0010] Optionally, the exhaust port is provided with an exhaust fan for air-drying the concrete sample.

[0011] Optionally, the inner walls of the test box and the water tank are respectively coated with anticorrosive paint.

[0012] Optionally, the water tank outlet comprises a first outlet and a second outlet; the water pump comprises a first water pump and a second water pump, the first outlet communicates with the inlet of the first water pump through a pipeline, the test tank water inlet communicates with the outlet of the first water pump through a pipeline, the test tank water outlet communicates with the inlet of the second water pump through a pipeline, and the water tank water inlet communicates with the outlet of the second water pump through a pipeline.

[0013] Optionally, a pH meter for monitoring the pH value of the test water body is arranged in the water tank.

[0014] A use method of an experimental device of simulating concrete damage under wave action, comprising:

[0015] Placing a concrete sample in the test box and adding a test water body into the water tank;

[0016] Controlling the water level, pressure value, pressure action time and cycle number in the test box through the controller;

[0017] The upper end of the telescopic rod is lifted to the height of the concrete sample by the controller, the test water in the water tank is delivered into the test tank by the water pump, and the water delivery is stopped after the set water level is sensed by the water level sensor;

[0018] The exhaust valve is closed, the test tank is pressurized to the set wave pressure value by the air pump, the pressurization is stopped after the set pressure is sensed by the pressure sensor, the air pump is started again by the controller when the pressure is lower than 90% of the set pressure value, and the concrete is damaged by simulating the wave pressure;

[0019] The air pump is started by the controller to release pressure, the pressure is sensed by the pressure sensor, the pressure reaches the initial water pressure, and then the valve is opened; the upper end of the telescopic rod is lowered to the bottom of the test tank, the test water in the test tank is delivered into the water tank by the water pump, and the delivery is stopped after the water level is sensed by the water level sensor and the water level is 0;

[0020] The concrete sample is air-dried, the relative humidity in the tank is sensed by the humidity sensor and stopped when the relative humidity reaches 50%, the valve is closed, the air pump is started to form negative pressure until the set wave suction value is reached, the air suction is stopped after the set pressure is sensed by the pressure sensor, and the air pump is started again by the controller when the pressure is higher than 90% of the set pressure value, and the concrete is damaged by simulating the wave suction.

[0021] The air pump is started by the controller to release pressure, the pressure is sensed by the pressure sensor, the pressure reaches 0, and then the valve is opened; the cycle operation is performed until the set cycle number is reached.

[0022] Optionally, the pH meter in the water tank monitors the pH value of the test water in real time, the water outlet of the water tank is opened to discharge the test water when the pH is greater than or equal to 8, and new test water is added.

[0023] Compared with the prior art, the beneficial effects achieved by the present application are:

[0024] The present application provides a test device for simulating the damage of concrete under the action of waves and a use method thereof. The concrete sample is pressurized to form a positive pressure in a submerged state, and air suction is formed to form a negative pressure in an air-dried state, thereby simulating the wave pressure and wave suction generated by waves on concrete in one cycle, and multiple cycles can be performed.

[0025] The device has a simple working principle and is easy to operate, and solves the problem that it is difficult to simulate the long-term damage of waves on concrete in a laboratory;

[0026] The present application can also be used as a test device for accelerating the corrosion of concrete. A specific erosion solution can be used according to research needs to achieve the effect of accelerating the erosion of concrete and shorten the test period. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic view of a test device for simulating the damage of concrete under the action of waves;

[0028] Figure 2 is a side view of the test box in the test device of the present application;

[0029] Figure 3 is a bottom view of the test box in the test device of the present application;

[0030] Figure 4 is a side view of the water tank in the test device of the present application;

[0031] Figure 5 is a bottom view of the water tank in the test device of the present application.

[0032] In the figure: 1, test box body; 1-1, test box cover; 1-2, bolt; 1-3, sealing ring; 1-4, test box foot; 1-5, pressurizing port; 1-6, exhaust port; 1-7, test box water inlet; 1-8, test box water outlet; 2, air pump; 3, valve; 4, exhaust fan; 5-1, first water pump; 5-2, second water pump; 6, water tank body; 6-1, water tank cover; 6-2, water tank foot; 6-3, water tank water inlet; 6-4, first water outlet; 6-5, second water outlet; 7, controller; 8, telescopic rod; 8-1, water level sensor; 8-2, pressure sensor; 8-3, humidity sensor; 9, support; 10, pipeline; 11, pH meter; 12, concrete sample. DETAILED DESCRIPTION

[0033] The present application will be further described below in conjunction with the accompanying drawings. The following examples are only used to more clearly illustrate the technical solutions of the present application, and cannot be used to limit the protection scope of the present application.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only for description purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0035] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0036] Example 1

[0037] like Figures 1 to 5 As shown, a test device for simulating concrete damage under wave action includes a test box, a water tank, a water pump for conveying water, and an air pump 2 for adjusting the wave pressure in the test box. The inner walls of the test box and the water tank are respectively coated with anti-corrosion paint; the test box includes a test box body 1 and a test box cover 1-1, the test box cover 1-1 is connected to the test box body 1 by four bolts 1-2, a sealing ring 1-3 is provided between the test box body 1 and the test box cover 1-1 for sealing the test box, and four test box feet 1-4 are provided at the outer bottom of the test box body 1; the water tank includes a water tank body 6 and a water tank cover 6-1 for opening and closing the water tank body 6, and four water tank feet 6-2 are provided at the outer bottom of the water tank body 6.

[0038] The inner bottom of the test box is provided with a stainless steel bracket 9 for placing the concrete sample 12. The spacing between the parallel steel bars on the bracket 9 does not exceed 100mm. The side wall of the test box is provided with a pressure port 1-5, an exhaust port 1-6 and a water inlet 1-7 for the test box. The air pump 2 is connected to the pressure port 1-5. The exhaust port 1-6 is provided with a valve 3 for opening and closing the exhaust port 1-6. The valve 3 is an electric butterfly valve. The valve 3 is provided in the test box and is connected to the exhaust port 1-6. The exhaust port 1-6 is provided with an exhaust fan 4 for air-drying the concrete sample 12; the bottom of the test box is provided with a water outlet 1-8 and a telescopic rod 8 arranged in the vertical direction. The telescopic rod 8 is an electric telescopic rod, the lower end of the telescopic rod 8 is connected to the inner bottom of the test box, and the upper end of the telescopic rod 8 is provided with a water level sensor 8-1 for measuring the water level in the test box, a pressure sensor 8-2 for measuring the pressure in the test box, and a humidity sensor 8-3 for measuring the humidity in the test box; the test box is provided with a controller 7 for controlling the air pump 2, the telescopic rod 8, the water level sensor 8-1, the pressure sensor 8-2, the humidity sensor 8-3, the valve 3, and the water pump. The air pump 2, the telescopic rod 8, the water level sensor 8-1, the pressure sensor 8-2, the humidity sensor 8-3, the valve 3, and the water pump are electrically connected to the controller 7.

[0039] The side tank wall of the water tank is provided with a water tank water inlet 6-3, and the tank bottom of the water tank is provided with a water tank water outlet, which includes a first water outlet 6-4 and a second water outlet 6-5; and the water tank is provided with a pH meter 11 for monitoring the pH value of the test water body.

[0040] The water pump includes a first water pump 5-1 and a second water pump 5-2, the first water outlet 6-4 is communicated with the inlet of the first water pump 5-1 through a pipeline 10, the test tank water inlet 1-7 is communicated with the outlet of the first water pump 5-1 through the pipeline 10, the test tank water outlet 1-8 is communicated with the inlet of the second water pump 5-2 through the pipeline 10, and the water tank water inlet 6-3 is communicated with the outlet of the second water pump 5-2 through the pipeline 10, and the pipeline 10 is a corrugated pipe.

[0041] Embodiment two

[0042] Based on the test device for simulating concrete damage under wave action in embodiment one, the embodiment provides a use method of the test device for simulating concrete damage under wave action, which includes the following steps:

[0043] S1, the concrete sample 12 is placed on the support 9 in the test tank, and the test water body is added into the water tank, and the test water body is prepared according to the actual marine environment or test requirements;

[0044] S2, the water level, pressure value, pressure action time and cycle number in the test tank are set through the controller 7, and the values are determined by the sample height and the wave environment to be simulated;

[0045] S3, the upper end of the telescopic rod 8 is lifted to the height of the concrete sample 12 through the controller 7, the first water pump 5-1 pumps water into the test tank, and the water level sensor 8-1 stops pumping water after sensing the set water level height;

[0046] S4, the air outlet valve 3 is closed, the air pump 2 is started to pressurize to the set wave pressure value, the pressure sensor 8-2 stops pressurizing after sensing the set pressure, and the controller starts the air pump 2 again when the pressure value is lower than 90% of the set pressure value, so as to simulate the wave pressure damage to the concrete;

[0047] S5, the controller 7 starts the air pump 2 to depressurize, the pressure sensor 8-2 stops after sensing that the pressure reaches the initial water pressure (calculated by the height difference between the end of the telescopic rod and the water surface), the valve 3 is opened, the upper end of the telescopic rod 8 is lowered to the bottom of the test tank, the test water body in the test tank is transported into the water tank through the second water pump 5-2, and the water level sensor 8-1 stops after sensing that the water level height is 0;

[0048] S6, the exhaust fan 4 is started to dry the concrete sample 12, the humidity sensor 8-3 senses the relative humidity in the box to 50%, then stop, the exhaust valve 3 is closed, the air pump 2 is started to form negative pressure until the set wave suction value, the pressure sensor 8-2 senses the set pressure, then stop pumping, when the pressure is higher than 90% of the set pressure value, the controller 7 starts the air pump 2 again, and the simulated wave suction damages the concrete;

[0049] S7, the controller 7 starts the air pump 2 to unload pressure, the pressure sensor 8-2 senses the pressure to 0, then stop, the valve 3 is opened, and S3 to S6 are repeated until the set cycle number is reached.

[0050] The pH meter 11 in the water tank monitors the pH value of the test water in real time, the water tank outlet is opened to discharge the test water when the pH is greater than or equal to 8, and new test water is added.

[0051] After the test under the action of the circulating waves, the concrete sample is taken out, the saturated water drying weighing method is used to measure the porosity of the concrete sample, the mechanical property test is carried out on the sample, the phenolphthalein indicator method is used to measure the dissolution depth of the sample, the X-ray computer tomography technology is used to analyze the damage characteristics of the concrete, and the damage mechanism of the concrete under the action of the waves is fully revealed.

[0052] The above is only the preferred embodiment of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should be considered as the protection scope of the present application.

Claims

1. A test device for simulating concrete damage under wave action, characterized by: The test box includes a test box, a water tank, a water pump for conveying water and an air pump for adjusting the wave pressure in the test box. The wall of the test box is provided with a pressure port, an exhaust port and a water inlet of the test box. The air pump is connected to the pressure port. The exhaust port is provided with a valve for opening and closing the exhaust port and an exhaust fan for air-drying the concrete sample. The bottom of the test box is provided with a test box water outlet and a telescopic rod. The upper end of the telescopic rod is provided with a water level sensor for measuring the water level in the test box, a pressure sensor for measuring the pressure in the test box and a humidity sensor for measuring the humidity in the test box. The wall of the water tank is provided with a water tank inlet and a water tank outlet. The water tank is provided with a pH meter for monitoring the pH value of the test water body. The water outlet of the test box is connected to the water inlet of the water tank through the water pump, and the water outlet of the water tank is connected to the water inlet of the test box through the water pump. The test box is provided with a controller for controlling the air pump, the telescopic rod, the water level sensor, the pressure sensor, the humidity sensor, the valve and the water pump.

2. A test device for simulating concrete damage under wave action according to claim 1, characterized in that: The test box includes a test box body and a test box cover, the test box cover is connected to the test box body by bolts, and the outer bottom of the test box body is provided with test box feet; the water tank includes a water tank body and a water tank cover for opening and closing the water tank body, and the outer bottom of the water tank body is provided with water tank feet.

3. A test device for simulating concrete damage under wave action according to claim 2, characterized in that: A sealing ring for sealing the test box is provided between the test box body and the test box cover.

4. The test device for simulating concrete damage under wave action according to claim 1, characterized in that: The bottom surface of the test box is provided with an anti-corrosion bracket for placing concrete samples.

5. The test device for simulating concrete damage under wave action according to claim 1, characterized in that: The inner walls of the test chamber and the water tank are coated with anti-corrosion coatings respectively.

6. The test device for simulating concrete damage under wave action according to claim 1, characterized in that: The water outlet of the water tank includes a first water outlet and a second water outlet; the water pump includes a first water pump and a second water pump, the first water outlet is connected to the inlet of the first water pump through a pipeline, the water inlet of the test box is connected to the outlet of the first water pump through a pipeline, the water outlet of the test box is connected to the inlet of the second water pump through a pipeline, and the water inlet of the water tank is connected to the outlet of the second water pump through a pipeline.

7. A method for using the test device for simulating concrete damage under wave action according to any one of claims 1 to 6, characterized in that: include: Place the concrete sample in the test box and add test water into the water tank; The water level, pressure value, pressure action time and number of cycles in the test chamber are controlled by the controller; The controller controls the upper end of the telescopic rod to rise to the height of the concrete sample, and the water pump delivers the test water in the water tank into the test chamber. The water supply stops after the water level sensor senses the set water level. Close the exhaust valve and use the air pump to pressurize the test chamber to the set wave pressure value. The pressure sensor stops pressurizing after sensing the set pressure. When the pressure drops below 90% of the set pressure value, the controller starts the air pump again to simulate wave pressure damage to concrete. The controller starts the air pump to release the pressure. The pressure sensor stops when it senses that the pressure reaches the initial water pressure. The valve is opened, and the upper end of the telescopic rod descends to the bottom of the test chamber. The test water in the test chamber is transported into the water tank through the water pump. The water level sensor stops when it senses that the water level is 0. When air-drying concrete specimens, the humidity sensor stops when it senses the relative humidity in the chamber reaches 50%, closes the valve, and starts the air pump to create a negative pressure until the set wave suction value is reached. The pressure sensor stops pumping when it senses the set pressure, and the controller starts the air pump again when the pressure exceeds 90% of the set pressure value, simulating wave suction damage to the concrete. The controller starts the air pump to release the pressure. The pressure sensor stops when the pressure reaches 0, opens the valve, and repeats the operation until the set number of cycles is reached.

8. The method for using the test device for simulating concrete damage under wave action according to claim 7, characterized in that: The pH meter in the water tank monitors the pH value of the test water in real time. When the pH is ≥8, the water outlet of the water tank is opened to discharge the test water and add new test water.

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