Testing device for simulating dry-wet cycle of pavement concrete in gobi environment

Abstract

The utility model relates to a testing device for simulating a dry-wet cycle of pavement concrete in a gobi environment, and belongs to the technical field of dry-wet cycle simulation devices. Aiming at the problem of complicated operation of the concrete dry-wet cycle experiment in the gobi environment at present, a partition plate and a hollow bracket are arranged in a box body, the box body is divided into an upper cavity and a lower cavity by the partition plate, the hollow bracket is positioned above the partition plate, a connecting channel is arranged on the partition plate, and an electromagnetic valve is mounted on the connecting channel; the upper cavity and the lower cavity are communicated with each other; a feeder, a water circulation mechanism, a wind generation mechanism and a timing controller are arranged outside the box body, the feeder is located at the top of the box body, a sealing door is arranged on the front side of the box body, the water circulation mechanism is communicated with the interior of the box body, the wind generation mechanism is communicated with the upper cavity, and the timing controller is electrically connected with the water circulation mechanism, the wind generation mechanism and the electromagnetic valve. The device can meet the requirements of various dry-wet cycle conditions, and the operation difficulty of testers is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of dry-wet cycle simulation devices, in particular to a test device for simulating dry-wet cycles of pavement concrete in a Gobi environment. Background Art

[0002] Cement concrete pavement refers to the pavement with cement concrete as the main material for the surface layer, also known as rigid pavement. At present, the most widely used in highways, urban roads and airport pavements in my country is the ordinary concrete pavement cast on site. This type of concrete pavement is not equipped with steel bars except for the joint area and local range (edges or corners), also known as plain concrete pavement.

[0003] However, there are large natural differences in temperature and climate across the country, which will inevitably make the service life of cement concrete pavements different. For example, in the Gobi region in northwest my country, there are large temperature differences between day and night, low air humidity, and frequent strong winds and sandstorms. Studies have shown that the harsh climate environment will increase the shrinkage of concrete and increase the risk of concrete cracking. This phenomenon is particularly serious in pavement concrete in the northwest region. Due to the influence of the Gobi environment, large areas of pavement cracking affect the driving of vehicles, and safety accidents caused by concrete cracking are common. Therefore, it is very necessary to increase research on the durability of concrete in the Gobi environment.

[0004] The ability of concrete to resist wet-dry cycles is an important indicator for evaluating the durability of concrete. Currently, there is only a test device for dry-wet cycles coupled with sulfate corrosion environments. The publication number of the device is CN110823799A, and the name is a vertical wet-dry cycle box device for a corrosive environment, including a circulation box and a liquid storage tank separated by a fixed frame in the casing, and a hand-drawn water pump and a blower connected to both sides of the casing respectively. Since the environment simulated by the prior art is a concrete pavement in an ocean splash zone or a surge zone, it cannot be used to simulate the dry-wet cycle of concrete in a Gobi environment, and there is currently no research on the simulation of dry-wet cycle of concrete in the dry and windy Gobi environment in the northwest region. In addition, in the process of studying the durability of concrete in the Gobi environment in the northwest region, the relevant experimental operations for the dry-wet cycle of concrete are complicated, and the characteristics of the Gobi environment with little rainfall and low air humidity also lead to a series of problems such as a long experimental period and unsatisfactory experimental results. Utility Model Content

[0005] The utility model aims to solve the shortcomings of the above-mentioned background technology and proposes a test device for simulating the dry-wet cycle of pavement concrete in a Gobi environment.

[0006] The utility model achieves the above technical objectives by adopting the following technical solutions:

[0007] A test device for simulating dry-wet cycles of pavement concrete in a Gobi environment, comprising a box, wherein the box is provided with:

[0008] A partition plate, which divides the box into an upper cavity and a lower cavity; a hollow bracket, located above the partition plate, for placing the test sample; a connecting channel, arranged on the partition plate, connecting the upper cavity and the lower cavity;

[0009] The external settings of the box are:

[0010] The feeder is located at the top of the box; the sealing door is located at the front side of the box and is arranged corresponding to the upper cavity; the water circulation mechanism is located on one side of the box and is connected with the interior of the box; the wind-making mechanism is located on the other side of the box and is arranged opposite to the water circulation mechanism, and the wind-making mechanism is connected with the upper cavity.

[0011] As a further preferred solution of the above solution: the feeder is funnel-shaped and movably inserted on the top of the box body, and the feeder includes a feeding end and a discharging end, the feeding end is located outside the box body, and the discharging end is located inside the box body.

[0012] A preferred embodiment of the discharge end of the feeder is that the discharge end is in a straight cylindrical shape and is integrally formed with the feed end.

[0013] Another preferred embodiment of the discharge end of the feeder is that the discharge end and the feed end are detachably connected.

[0014] As a further improvement of the discharge end, the discharge end is in a curved cylindrical shape, and a plurality of diversion holes are arranged in the circumference of the discharge end.

[0015] As a further improvement of the discharge end, the discharge end is trumpet-shaped, and a plurality of discharge cavities are arranged inside the discharge end.

[0016] As a further preferred solution of the above solution: the connecting channel is a plurality of through holes penetrating the partition plate, and the plurality of through holes are distributed in the middle of the partition plate along the length direction of the partition plate.

[0017] By adopting the above solution, further, each through hole is provided with an electromagnetic valve, and the electromagnetic valve is used to control the liquid in the upper cavity to enter the lower cavity.

[0018] As a further preferred embodiment of the above scheme: filters are provided at the places where the water circulation mechanism and the wind-generating mechanism communicate with the box body.

[0019] As a further preferred embodiment of the above scheme: it also includes a timing controller, and the timing controller is electrically connected to the water circulation mechanism, the wind-generating mechanism and the electromagnetic valve.

[0020] Compared with the prior art, the technical solution of the utility model has the following beneficial effects:

[0021] 1. The utility model provides a sealed door on the front side of the box to facilitate the placement of test samples, and provides a feeder on the top of the box to simulate the sandstorm environment of different Gobi areas by adding different sands. The feeder is provided with various forms of feeding structures, which can realize the simulation test of concrete dry-wet cycle in sandstorm environments of different degrees according to the sandstorm environment scenes to be simulated.

[0022] 2. The utility model installs three electromagnetic valves on the partition plate, and controls the immersion time of the test sample and the different flow rates of the liquid entering the lower cavity by controlling the electromagnetic valves. The three electromagnetic valves are all independently controlled, and the expected effect can be achieved through simple operation.

[0023] 3. The utility model centrally controls the water pump, blower and electromagnetic valve through the timing controller. The soaking time, blowing time, liquid flow time into the lower cavity, etc. of the whole device can be set through the timing controller, which can meet the requirements of various dry-wet cycle conditions and greatly reduce the operating difficulty of the test personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the drawings required in the embodiments are briefly introduced below. The drawings described below are only part of the embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 It is a schematic diagram of the overall structure of a test device for simulating dry-wet cycles of pavement concrete in a Gobi environment according to the utility model;

[0026] Figure 2 It is a partial structural perspective view of the device of the utility model;

[0027] Figure 3 It is a front structural perspective view of the device of the utility model without the feeder installed;

[0028] Figure 4 This is a schematic diagram of the structure of a feeder according to Embodiment 1 of the present utility model;

[0029] Figure 5 This is a schematic diagram of the structure of a feeder according to Embodiment 2 of the present utility model;

[0030] Figure 6 This is a schematic diagram of the structure of a feeder according to Embodiment 3 of the present utility model;

[0031] Figure 7 This is an enlarged view of the feeder structure of Example 3 of the utility model;

[0032] In the figure: 1-box; 11-upper cavity; 12-lower cavity; 13-connecting hole; 2-partition plate; 3-hollow bracket; 4-feeder; 41-feeding end; 42-discharging end; 421-diversion hole; 422-discharging cavity; 5-sealed door; 6-water circulation mechanism; 61-water pump; 62-upper pipeline; 63-lower pipeline; 7-wind-generating mechanism; 71-blower; 72-air inlet channel; 8-electromagnetic valve; 9-filter; 10-timing controller. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present utility model will be described clearly and completely below in conjunction with the drawings in the embodiments. Obviously, the described embodiments are only a part of the embodiments, rather than all the embodiments.

[0034] Reference Figure 1-3 The utility model proposes a test device for simulating the dry-wet cycle of pavement concrete in a Gobi environment, comprising a box body 1, a movable roller is provided at the bottom of the box body 1, and the box body 1 is made of a transparent material, so that the operator can observe the inside of the box body at any time;

[0035] like Figure 2 In the embodiment, a partition plate 2 and a hollow bracket 3 are fixedly installed inside the box body 1. The partition plate 2 divides the inside of the box body 1 into two parts: an upper cavity 11 and a lower cavity 12. The upper cavity 11 and the lower cavity 12 are used for circulation and liquid storage, respectively. A connecting channel that connects the upper cavity 11 and the lower cavity 12 is opened on the partition plate, so that the liquid in the upper cavity 11 can flow into the lower cavity 12. The hollow bracket 3 is located above the partition plate 2 and is used to place the test sample;

[0036] A feeder 4, a water circulation mechanism 6 and a wind-generating mechanism 7 are provided on the outside of the box body 1. A connecting hole 13 is provided on the top of the box body 1. The feeder 4 is movably installed at the connecting hole 13, and the neck of the feeder 4 is adapted to the connecting hole 13. After installation, the feeder 4 is clamped on the connecting hole 13. The water circulation mechanism 6 is connected to one side of the box body 1 and is simultaneously connected to the upper cavity 11 and the lower cavity 12 of the box body 1. The wind-generating mechanism 7 is connected to the other side of the box body 1 opposite to the water circulation mechanism 6, and the wind-generating mechanism 7 is connected to the upper cavity 11. In order to facilitate the placement of test samples, a sealed door 5 is provided on the front side of the box body 1 and at a position corresponding to the upper cavity 11. The outer surface of the sealed door 5 is provided with a button, and the sealed door 5 can be automatically opened by pressing the button.

[0037] like Figure 2-3As shown, the connecting channel is a plurality of through holes penetrating the partition plate 2, and the plurality of through holes are uniformly distributed in the middle part of the partition plate 2 along the length direction of the partition plate 2. In the present application, a total of three through holes are provided, and each through hole is provided with an electromagnetic valve 8. The three electromagnetic valves 8 are independently controlled, and the electromagnetic valves 8 are used to control the liquid in the upper cavity 11 to enter the lower cavity 12, and the electromagnetic valves 8 can control the flow rate of the liquid entering the lower cavity 12, which can meet various experimental conditions.

[0038] More specifically, see Figure 1 The water circulation mechanism 6 includes a water pump 61, an upper pipe 62 and a lower pipe 63. A liquid injection port and a liquid discharge port are respectively opened at the top of the box body 1 and the lower end of the left side wall of the box body 1. The water pump 61 is connected to the liquid injection port through the upper pipe 62, and the water pump 61 is connected to the liquid discharge port through the lower pipe 63.

[0039] More specifically, the wind-generating mechanism 7 includes a blower 71 and an air inlet duct 72. A vent is provided at the upper end of the right side wall of the box body 1, and the vent is connected to the blower 71 through the air inlet duct 72. In order to prevent sand and stone particles and other foreign particles from entering the water pump 61 or the blower 71 and causing damage thereto, filters 9 or filter nets are installed at the liquid filling port, the liquid discharge port and the vent.

[0040] A timing controller 10 is also provided on the outside of the box body 1. The timing controller 10 is electrically connected to the water pump 61, the blower 71, and the electromagnetic valve 8. The timing controller 10 is powered by connecting an external power supply, and the water pump 61, the blower 71 and the electromagnetic valve 8 are controlled by the timing controller 10. The soaking time and the blowing time are set by the timing controller 10, thereby realizing centralized control of the entire test device.

[0041] The feeder 4 of the present invention is added to simulate the dry-wet cycle of the Gobi environment in the upper cavity 11. The feeder 4 can be provided with a variety of structures to achieve this, which will be specifically described below through three embodiments. Example 1

[0042] like Figure 4 As shown, the feeder 4 is funnel-shaped, and includes a feed end 41 and a discharge end 42. The feed end 41 is located outside the box body 1, and the discharge end 42 is located inside the box body 1. A cover is provided on the feed end 41, and the cover can effectively prevent sand from being blown to the outside of the box body 1 by the blower 71. The discharge end 42 is straight-cylindrical, and the discharge end 42 and the feed end 41 are integrally formed. When needed, the discharge end 42 can be directly inserted into the connecting hole 13. Example 2

[0043] The difference from Example 1 is that the discharge end 42 and the feed end 41 are detachably connected, and the top of the discharge end 42 is sleeved on the bottom of the feed end 41, such as Figure 5 As shown, the discharge end 42 is in a curved cylindrical or spiral cylindrical shape, and a plurality of diversion holes 421 are distributed on the discharge path of the discharge end 42, so that the sand can be dispersed along the curve during the falling process. Under the action of the blower 71, the sand is blown away in a circumferential direction, simulating a multi-layered sandstorm environment. Example 3

[0044] On the basis of Example 2, in order to simulate a larger sandstorm environment, the following further improvements are made to the discharge end 42 .

[0045] like Figure 6-7 As shown, the discharge end 42 is trumpet-shaped, and a plurality of discharge cavities 422 are arranged inside the discharge end 42. The discharge cavities 422 are distributed in the center and circumference of the discharge end 42, so that when sand flows from the feed end 41 to the discharge end 42, more sand can be discharged and dispersedly flowed out from different discharge cavities 422. Under the action of the blower 71, a larger wind and sand environment is simulated.

[0046] Working principle: In the actual test of the test device for dry-wet cycle of pavement concrete simulating the Gobi environment of the utility model, the sealing door 5 is first opened, the test sample is placed on the hollow bracket 3, and then the sealing door 5 is closed, and the water pump 61 is started to inject water into the upper cavity 11, and the immersion is maintained for a period of time. After the immersion is completed, the electromagnetic valve 8 is opened to allow the liquid to flow into the lower cavity 12. After the drainage is completed, the electromagnetic valve 8 is closed, and then the blower 71 is turned on to ventilate and dry the upper cavity 11. At the same time, sand from the experimental Gobi environment is added from the feeding end 41 of the feeder 4 to start the drying stage under the simulated wind and sand conditions. After the air-drying process is completed, the water pump 61 is turned on again to inject water for immersion after cooling for a period of time. This is repeated to achieve the dry-wet cycle of pavement concrete in the simulated next-door environment.

[0047] It should be clear that the above detailed description of the embodiments of the utility model provided in the accompanying drawings is only used to further illustrate the utility model, and is not intended to limit the scope of the utility model claimed for protection, but only represents selected embodiments of the utility model. Based on the embodiments of the utility model, some non-essential improvements and adjustments made by ordinary technicians in this field according to the above content of the utility model belong to the protection scope of the utility model.

Claims

1. A test device for simulating the dry-wet cycle of pavement concrete in a Gobi environment, comprising a box (1), characterized in that: The interior of the box (1) is provided with: A partition plate (2) which divides the box body (1) into an upper cavity (11) and a lower cavity (12); A hollow bracket (3), located above the partition plate (2), and used for placing a test sample; A connecting channel, provided on the partition plate (2), connecting the upper cavity (11) and the lower cavity (12) to each other; The exterior of the box (1) is provided with: A feeder (4) is located on the top of the box (1); A sealing door (5) is located at the front side of the box body (1) and is arranged corresponding to the upper cavity (11); A water circulation mechanism (6) is located on one side of the box body (1) and is connected to the interior of the box body (1); The wind-generating mechanism (7) is located on the other side of the box body (1) and is arranged opposite to the water circulation mechanism (6), and the wind-generating mechanism (7) is connected to the upper cavity (11).

2. The test device for dry-wet cycle of pavement concrete in a simulated Gobi environment according to claim 1, characterized in that: The feeder (4) is funnel-shaped and movably inserted at the top of the box body (1). The feeder (4) comprises a feed end (41) and a discharge end (42). The feed end (41) is located outside the box body (1), and the discharge end (42) is located inside the box body (1).

3. The test device for dry-wet cycle of pavement concrete in a simulated Gobi environment according to claim 2, characterized in that: The discharge end (42) is in a straight cylindrical shape, and the discharge end (42) and the feed end (41) are integrally formed.

4. The test device for dry-wet cycle of pavement concrete in a simulated Gobi environment according to claim 2, characterized in that: The discharge end (42) and the feed end (41) are detachably connected.

5. The test device for dry-wet cycle of pavement concrete in a simulated Gobi environment according to claim 4, characterized in that: The discharge end (42) is in a curved cylindrical shape, and a plurality of flow diversion holes (421) are arranged in the circumferential direction of the discharge end (42).

6. The test device for dry-wet cycle of pavement concrete in a simulated Gobi environment according to claim 4, characterized in that: The discharge end (42) is trumpet-shaped, and a plurality of discharge cavities (422) are arranged inside the discharge end (42).

7. The test device for dry-wet cycle of pavement concrete in a simulated Gobi environment according to claim 1, characterized in that: The connecting channel is a plurality of through holes penetrating the partition plate (2), and the plurality of through holes are distributed on the partition plate (2) along the length direction of the partition plate (2).

8. The test device for dry-wet cycle of pavement concrete in a simulated Gobi environment according to claim 7, characterized in that: An electromagnetic valve (8) is provided at each through hole, and the electromagnetic valve (8) is used to control the liquid in the upper cavity (11) to enter the lower cavity (12).

9. The test device for dry-wet cycle of pavement concrete in a simulated Gobi environment according to claim 8, characterized in that: Filters (9) are provided at the locations where the water circulation mechanism (6) and the wind-generating mechanism (7) communicate with the box body (1).

10. The test device for dry-wet cycle of pavement concrete in a simulated Gobi environment according to claim 9, characterized in that: It also includes a timing controller (10), and the timing controller (10) is electrically connected to the water circulation mechanism (6), the wind-generating mechanism (7), and the electromagnetic valve (8).

Images