Two-chambered rock-concrete composite specimen differential curing device and method of use thereof

Abstract

The application discloses a two-cavity rock-concrete combined sample differential curing device and a use method thereof, which comprises a curing bin body and a control element integrated area, a heating system and a humidifying system are arranged in the bin body, and each system is adjusted and controlled through a data controller. The curing bin body is divided into left and right bin bodies through a movable partition plate, mist transmission pipes are connected to the two bin bodies respectively, and heating plates are arranged, so that the temperature, humidity and other data of the two bin chambers can be adjusted to create different curing environments, and then the concrete test pieces can be differentially cured in the two bin chambers. In addition, a heating rod is further arranged and acts on the rock test piece, temperature is transmitted to the target concrete test piece through the heat transfer effect of the rock test piece, and the change of the physical and mechanical properties of the concrete test piece caused by the heat transfer effect of the adjacent rock test piece under different curing environments is researched.

Description

Technical Field

[0001] This invention relates to the fields of indoor test curing and concrete preparation technology, and in particular to a two-cavity rock-concrete composite specimen differential curing device and its usage method. Background Technology

[0002] Curing chambers are used for the constant temperature and humidity standard curing of concrete specimens and cement samples. They are generally made of imported stainless steel plates, and the partitions of the curing chamber are placed directly inside the curing compartment. The production process of concrete specimens includes: concrete mixing, placement, mold closing, prestressing tensioning, centrifugal molding, steam curing, demolding, and autoclaving. Among these, steam curing determines the demolding strength, concrete quality, and effective stress of the specimen after demolding, making it a crucial step in specimen production.

[0003] During underground construction in high-temperature environments, after excavation, the surrounding rock is exposed to the air. Comprehensive cooling measures are required during the construction period, followed by initial support and secondary lining. The strength and durability of concrete are significantly affected by curing temperature and humidity. In high-temperature underground engineering, the temperature and humidity of the surrounding rock are constantly changing. The initial shotcrete support is in direct contact with the surrounding rock. Under the dynamic temperature and humidity changes in a high-temperature environment, the rock-shotcrete composite, the mechanical and microscopic mechanisms of shotcrete are not yet fully understood. In-situ sampling is highly susceptible to damage to the samples. There is a lack of curing devices suitable for these conditions both domestically and internationally. Therefore, there is an urgent need to develop a two-chamber differential curing device for rock-concrete composite samples to provide curing conditions that simulate the real high-temperature underground engineering environment for further mechanical and microscopic testing of the rock-shotcrete composite. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies, such as the difficulty in preparing test specimens and the inability to further study the conduction law of internal temperature-related parameters of concrete used for tunnel support. This invention provides a two-cavity rock-concrete composite specimen differential curing device and its usage method, which effectively solves the above problems.

[0005] This invention is achieved through the following technical solution: A two-chamber differential curing device for rock-concrete composite specimens includes a housing containing an independent power chamber and a curing chamber. The curing chamber is divided into two left and right curing compartments by two sliding partitions. Rectangular grooves are formed on the opposite surfaces of the two sliding partitions. When the two partitions contact, the two rectangular grooves form a square specimen mounting clearance notch. A shelf is installed at the bottom of each curing compartment. Two insulated glass doors are installed at the front of each curing compartment. [The last sentence appears to be incomplete and possibly refers to a separate, unrelated point about internal components.] A thermometer is installed, and a heating rod is installed inside one of the curing chambers. The rock-concrete composite specimen is placed on a shelf, with the rock specimen end and the concrete specimen end located in the two curing chambers respectively. A water tank, a water pump, an atomizer, and a heating layer are installed in the power chamber. The water tank has an external water pipe and is connected to the water pump. An atomizer is installed inside the water pump, and the other end is connected to a mist transmission pipe. A heating layer is set at the connection point. The water pump provides the bursting force, and the water pump is connected to the two curing chambers respectively through different mist transmission pipes.

[0006] The sliding partition is U-shaped, with two sliding partitions facing each other. Two sliding groove tracks are provided at the front and rear ends of the two sliding partitions. The sliding groove track at the rear end is a single track fixed to the inner wall of the curing chamber. The sliding groove track at the front end includes an upper track, a middle track, and a lower track. The upper and lower tracks are fixed to the inner wall of the curing chamber. The middle track is placed between the upper and lower tracks. The upper and lower tracks are fixed to the upper and lower tracks respectively by inserting blocks.

[0007] The height of the intermediate track is equal to the height of the two sliding partitions when they are in contact. When the two sliding partitions are in contact, the plug-in blocks are inserted into the upper and lower ends of the intermediate track respectively. The two sliding partitions are located between the two plug-in blocks and are in close contact with the plug-in blocks.

[0008] An elastic rubber contact layer is wrapped around the edge of the contact surface of each of the two sliding partitions. When the two sliding partitions are in contact, the two rectangular grooves form a square specimen installation clearance notch with various sizes.

[0009] A filter layer and a storage box are placed below the shelf.

[0010] The thermometer is equipped with a connector, which is connected to a data connector. The other end of the data connector is connected to a data controller, and relevant data information is displayed on the data controller in real time. The thermometer is also equipped with adhesive on the inside, which is applied to rock specimens and concrete specimens respectively. The thermometer contains a detachable temperature measuring element that can be freely removed and replaced.

[0011] The heating rod is suspended inside the curing chamber and placed inside the rock specimen end of the rock-concrete composite specimen; the heating rod is connected to the data transmission line, and the other end is connected to the data controller, which controls the switching of the heating rod.

[0012] A hygrometer and a thermometer are installed in both of the aforementioned maintenance chambers, and a ventilation pipe is also provided on the power compartment.

[0013] Each edge of the two insulated glass doors is wrapped with a layer of elastic rubber contact layer.

[0014] A method for using a two-cavity rock-concrete composite specimen differential curing device includes the following steps: Step 1: Cut the rock block to the required size for the experiment and pre-drill holes for placing the heating rod; Step 2: Select a mold of the corresponding size according to the size of the rock block, place the pre-processed rock block in it, then pour concrete into the mold, vibrate, and let it stand. Step 3: Adjusting the dimensions of the maintenance device Depending on the size of the specimen to be cured, the upper and lower sliding partitions should be replaced accordingly. After replacement, the airtightness of the two curing chambers should be checked to ensure the curing effect. Step 4: Place the maintenance device away from the power source, then connect the water source to the external water pipe and turn on the sewer. Then fill the water tank with water until the water level reaches the required height. Turn on the power switch of the maintenance device. After the machine is running normally, wait for the temperature and humidity to reach the required levels. Step 5: Curing of Concrete Specimens Immediately after demolding, the specimens are placed in a two-cavity rock-concrete composite specimen differential curing device. The external door and internal insulated glass door of the curing device are opened, and the two sliding partitions are slid apart in advance to leave space for placement. The demolded rock-concrete composite specimens are placed on the shelf, and the sliding partitions are operated again to make the two sliding partitions contact each other. The rock-concrete composite specimens are then clamped and secured by inserting plugs. The surface of the rock-concrete composite specimens should be kept moist, but the specimens should not be directly rinsed with water. Step Six: Data Controller Setup After the specimen is placed in the curing chamber, connect the connector on the thermometer to the data connector, close the door of the curing device, and the data controller will display the temperature and humidity values. When the temperature in the two curing chambers is high or low, the data controller will control the water pump and heating rod to adjust automatically, and the temperature change of the specimen will be monitored in real time through the data controller. Step 7: Complete maintenance When the required curing time is reached, the curing time is removed and used for subsequent physical and mechanical performance tests and inspections.

[0015] The advantages of the present invention are: (1) The sliding partition of the present invention is divided into upper and lower partitions, and each contact edge is wrapped with an elastic rubber contact layer. The environment in the two compartments can reach the required values ​​by simple sliding. The sliding partition has space inside for placing the required curing specimens. (2) The curing chamber of the present invention is equipped with a double-door heat-insulated glass door, which makes it easy to observe the curing condition of the specimens in the curing chamber without affecting the curing environment; (3) The present invention is equipped with a thermometer and a hygrometer in the curing chamber, which makes it easy to grasp and control the curing environment in the curing chamber; at the same time, the data controller can also control the working status of the heating rod, which can simulate the temperature transfer law of the tunnel lining concrete to the greatest extent. (4) The thermometer installed on the surface of the curing specimen can fit the surface of the concrete specimen and accurately read the temperature information. At the same time, the temperature measuring plate inside the thermometer can be replaced and replenished in time. The data transmission line is also designed as a plug-in connection type, which is convenient to install. (5) In this invention, the water mist in the mist transmission pipe is extracted from the water storage tank by a water pump and then atomized and transmitted to different curing chambers via an atomizer. The relevant efficiency and quantity can be controlled by a data controller. Attached Figure Description

[0016] Figure 1 This is the main body of the device of the present invention; Figure 2 To face up Figure 1 Layered structure; Figure 3 To face up Figure 2 Layered structure; Figure 4 To face up Figure 3 Layered structure; Figure 5 Right view of the maintenance device; Figure 6 Top view of the maintenance equipment; Figure 7 Structural diagrams of sliding partitions in different dimensions; Figure 8 This is a structural diagram of a thermometer; Figure 9 A schematic diagram of the sliding partition and the track structure at both ends; Figure 10 This is a schematic diagram of the structure when two sliding partitions are in contact. Numbered in the diagram: 1. Chamber, 2. Curing chamber, 3. Insulated glass door, 4. Sliding partition, 41. Upper track, 42. Middle track, 43. Lower track, 44. Connecting block, 45. Sliding groove track, 5. Shelf, 6. Filter layer, 7. Storage box, 8. Heating rod, 9. Thermometer, 901. Thermometer plate, 10. External water pipe, 11. Water tank, 12. Water pump, 13. Atomizer, 14. Mist transmission pipe, 15. Ventilation pipe, 16. Data connector, 17. Connector, 18. Data transmission line, 19. Data controller, 20. Humidity meter, 21. Thermometer, 22. Elastic rubber contact layer, 23. Heating layer, 24. Rock-concrete composite specimen, 241. Rock specimen end, 242. Concrete specimen end, 25. Power chamber, 26. Specimen installation clearance notch. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings: like Figure 1 As shown, a two-chamber differential curing device for rock-concrete composite specimens includes a housing 1. Inside the housing 1 are independent power chambers 25 and curing chambers 2. The curing chamber 2 is divided into left and right curing cavities by two sliding partitions 4. Rectangular grooves are formed on the opposite surfaces of the two sliding partitions 4. When the two sliding partitions 4 are in contact, the two rectangular grooves form a square specimen installation clearance notch 26. A shelf 5 is installed at the bottom of each curing cavity. Two insulated glass doors 3 are installed on the front of the curing chamber 2. A thermometer 9 is installed inside each curing cavity. A heating rod 8 is installed inside each curing chamber. The rock-concrete composite specimen 24 is placed on the shelf 5, with the rock specimen end 241 and the concrete specimen end 242 located in the two curing chambers respectively. A water tank 11, a water pump 12, an atomizer 13 and a heating layer 23 are installed in the power chamber 25. The water tank 11 has an external water pipe 10 and is connected to the water pump 12. An atomizer 13 is installed inside the water pump 12, and the other end is connected to a mist transmission pipe 14. A heating layer 23 is set at the connection. The water pump provides the bursting force. The water pump 12 is connected to the two curing chambers respectively through different mist transmission pipes 14.

[0018] like Figure 9 , 10As shown, the sliding partition 4 is U-shaped, with two sliding partitions 4 arranged opposite each other. Two sliding groove tracks 45 are provided at the front and rear ends of the two sliding partitions 4. The sliding groove track at the rear end is a single track fixed to the inner wall of the curing chamber 2. The sliding groove track at the front end includes an upper track 41, a middle track 42, and a lower track 43. The upper track 41 and the lower track 43 are both fixed to the inner wall of the curing chamber 2. The middle track 42 is placed between the upper track 41 and the lower track 43. The upper and lower ends are fixed to the upper track 41 and the lower track 43 respectively by inserting blocks 44.

[0019] The height of the intermediate track 42 is equal to the height of the two sliding partitions 4 when they are in contact. When the two sliding partitions 4 are in contact, the plug-in blocks 44 are inserted into the upper and lower ends of the intermediate track 42 respectively. The two sliding partitions 4 are located between the two plug-in blocks 44 and are in close contact with the plug-in blocks 44.

[0020] like Figure 2 , 5 As shown in Figures 6 and 7, the sliding partition 4 is divided into two parts, upper and lower. Each of the contact edges of the two sliding partitions 4 is wrapped with an elastic rubber contact layer 22. When the two sliding partitions 4 are in close contact, a square specimen installation clearance notch 26 is left in the center of the sliding partition for placing the specimen, while ensuring the airtightness of each of the two compartments. The sliding partition 4 has a variety of curing sizes and can be used for curing specimens of different sizes.

[0021] like Figure 1 As shown, the curing chamber 2 is sealed on five sides, and the remaining side is equipped with a two-door insulated glass door 3. The insulated glass door 3 opens to the outside, and each edge of the insulated glass door 3 is wrapped with an elastic rubber contact layer 22 to ensure the airtightness of each chamber.

[0022] like Figure 3 , 8 As shown, the thermometer 9 is equipped with a connector 17 that can be plugged into the data connector 16. The other end of the data connector 16 is connected to the data controller 19, and the relevant data information is displayed on the data controller 19 in real time.

[0023] like Figure 4 , 5 As shown, the heating rod 8 is suspended in the curing chamber 2 and placed inside the end 241 of the rock specimen to simulate the field conditions, ensure the accuracy of the relevant data of the specimen, and then study its regularity.

[0024] like Figure 8 As shown, the thermometer 9 has an adhesive inside, which is applied to the rock specimen end and the concrete specimen end respectively. At the same time, the thermometer 9 contains a thermometer 901 that can be freely disassembled and replaced.

[0025] like Figure 2 As shown, the water storage tank 11 has an external water pipe 10, which is connected to a water pump 12. The water pump 12 also contains an atomizer 13, with its other end connected to a mist transmission pipe 14. A heating layer 23 is installed at the connection point, with the pump 12 providing the propulsion force. The water pump 12 has two mist transmission pipes 14, each connected to a different curing chamber 2, ensuring constant temperature and humidity curing conditions.

[0026] like Figure 3 As shown, the heating rod 8 is connected to the data transmission line 18, and the other end is connected to the data controller 19, which controls the switch.

[0027] A filter layer 6 and a storage box 7 are placed below the shelf 5. During the maintenance process, the humidity is usually high, which produces water droplets. The water droplets flow freely down to the next layer, are filtered by the filter layer, and are collected in the storage box. They can then be returned to the water pump for recycling.

[0028] The curing chamber of this invention is divided into two curing cavities, left and right, by upper and lower sliding partitions 4. When the two upper and lower sliding partitions 4 are closed (in contact), they perform the separation function; when the two upper and lower sliding partitions 4 are separated (not in contact), they can be used for preliminary preparation work such as sample placement.

[0029] The sliding partition 4 of this invention has a better size and can be used to cure specimens of different sizes.

[0030] The specimens are made of two materials: rock and concrete. They are joined together as a whole by being poured into a mold and solidified. The purpose of dividing the specimens into two compartments is to cure the different material parts of the combined specimens.

[0031] (For example: the environment of the left compartment is mainly for curing the concrete portion of the composite specimen; the environment of the right compartment is mainly for curing the rock portion of the composite specimen.) The thermometer 9 (with built-in temperature measuring plate 901) focuses on the real-time temperature of the specimen to study the temperature transfer law of the specimen. Therefore, two thermometers are needed: one to measure the concrete part of the composite specimen and the other to measure the rock part of the composite specimen. The heating rod is only used for directly heating the composite specimen.

[0032] A hygrometer 20 and a thermometer 21 are installed in both of the aforementioned curing chambers for real-time monitoring and control of the curing environment. A ventilation duct 15 is also provided on the power chamber 25.

[0033] A method for using a two-cavity rock-concrete composite specimen differential curing device includes the following steps: Step 1: Cut the rock block to the required size for the test and pre-drill holes for placing the heating rod 8; Step 2: Select a mold of the corresponding size according to the size of the rock block, place the pre-processed rock block in it, then pour concrete into the mold, vibrate, and let it stand. Step 3: Adjusting the dimensions of the maintenance device Depending on the size of the specimen to be cured, the upper and lower sliding partition 4 should be replaced accordingly. After the replacement is completed, the airtightness of the two curing chambers should be checked to ensure the curing effect. Step 4: Place the maintenance device away from the power source, then connect the water source to the external water pipe and turn on the sewer. Then fill the water tank with water until the water level reaches the required height. Turn on the power switch of the maintenance device. After the machine is running normally, wait for the temperature and humidity to reach the required levels. Step 5: Curing of Concrete Specimens Immediately after demolding, the specimens are placed in a two-cavity rock-concrete composite specimen differential curing device. The external door and internal heat-insulating glass door 3 of the curing device are opened, and the two upper and lower sliding partitions 4 are slid apart in advance to leave space for placing items. The demolded rock-concrete composite specimens are placed on the shelf 5. The upper and lower sliding partitions 4 are operated again to make the two upper and lower sliding partitions 4 contact each other, and the rock-concrete composite specimens are clamped and secured by inserting the plug-in block 44. The surface of the rock-concrete composite specimens should be kept moist, but the specimens should not be directly rinsed with water. Step Six: Data Controller Setup After the specimen is placed in the curing chamber 2, the connector 17 on the thermometer 9 is connected to the data connector 16. The door of the curing device is closed. The data controller 19 will display the temperature and humidity values. When the temperature in the two curing chambers is high or low, the data controller 19 controls the water pump 12 and the heating rod 8 to adjust automatically. The temperature change of the specimen is monitored in real time through the data controller (19). Step 7: Complete maintenance When the required curing time is reached, the curing time is removed and used for subsequent physical and mechanical performance tests and inspections.

Claims

1. A two-cavity differential curing device for rock-concrete composite specimens, characterized in that: The device includes a housing (1), inside which are independent power chambers (25) and curing chambers (2). The curing chamber (2) is divided into two curing cavities by two sliding partitions (4). Rectangular grooves are formed on the opposite surfaces of the two sliding partitions (4). When the two sliding partitions (4) are in contact, the two rectangular grooves form a square specimen installation clearance notch (26). A shelf (5) is installed at the bottom of each curing cavity. Two insulated glass doors (3) are installed on the front side of the curing chamber (2). A thermometer (9) is installed inside each of the two curing cavities. A heating rod (8) is installed inside one of the curing cavities. The rock-concrete composite specimen (24) is placed on the shelf (5), with the rock specimen end (241) and the concrete specimen end (242) located in two curing chambers respectively. A water tank (11), a water pump (12), an atomizer (13) and a heating layer (23) are installed in the power chamber (25). The water tank (11) has an external water pipe (10) and is connected to the water pump (12). An atomizer (13) is provided in the water pump (12), and the other end is connected to a mist transmission pipe (14). A heating layer (23) is provided at the connection. The water pump (12) is connected to the two curing chambers respectively through different mist transmission pipes (14).

2. The two-cavity rock-concrete composite specimen differential curing device according to claim 1, characterized in that: The sliding partition (4) is U-shaped. Two sliding partitions (4) are arranged opposite each other. Two sliding groove tracks (45) are provided at the front and rear ends of the two sliding partitions (4). The sliding groove track at the rear end is a whole track and is fixed on the inner wall of the curing chamber (2). The sliding groove track at the front end includes an upper track (41), a middle track (42) and a lower track (43). The upper track (41) and the lower track (43) are both fixed on the inner wall of the curing chamber (2). The middle track (42) is placed between the upper track (41) and the lower track (43). The upper and lower ends are fixed to the upper track (41) and the lower track (43) respectively by setting plug-in blocks (44).

3. The two-cavity rock-concrete composite specimen differential curing device according to claim 2, characterized in that: The height of the intermediate track (42) is equal to the height of the two sliding partitions (4) when they are in contact. When the two sliding partitions (4) are in contact, the plug-in blocks (44) are inserted into the upper and lower ends of the intermediate track (42) respectively. The two sliding partitions (4) are located between the two plug-in blocks (44) and are in close contact with the plug-in blocks (44).

4. The two-cavity rock-concrete composite specimen differential curing device according to claim 3, characterized in that: An elastic rubber contact layer (22) is wrapped around the edge of the contact surface of each of the two sliding partitions (4); when the two sliding partitions (4) are in contact, the two rectangular grooves form a square specimen installation clearance notch (26) with various sizes.

5. The two-cavity rock-concrete composite specimen differential curing device according to claim 1, characterized in that: A filter layer (6) and a storage box (7) are placed below the shelf (5).

6. The two-cavity rock-concrete composite specimen differential curing device according to claim 3, characterized in that: The thermometer (9) is provided with a connector (17), which is connected to a data connector (16), and the other end of the data connector (16) is connected to a data controller (19); the thermometer (9) is also provided with adhesive on the inside, and the thermometer (9) contains a detachable temperature measuring element (901).

7. The two-cavity rock-concrete composite specimen differential curing device according to claim 6, characterized in that: The heating rod (8) is suspended inside the curing chamber (2) and placed inside the rock specimen end (241) of the rock-concrete composite specimen (24); the heating rod (8) is connected to the data transmission line (18), and the other end is connected to the data controller (19), and the data controller (19) controls the switch of the heating rod (8).

8. The two-cavity rock-concrete composite specimen differential curing device according to claim 1, characterized in that: A hygrometer (20) and a thermometer (21) are installed in both of the aforementioned maintenance chambers, and a ventilation pipe (15) is also provided on the power chamber (25).

9. The two-cavity rock-concrete composite specimen differential curing device according to claim 1, characterized in that: Each edge of the two-pane insulated glass door (3) is wrapped with an elastic rubber contact layer (22).

10. A method of using the two-cavity rock-concrete composite specimen differential curing device as described in claim 6, characterized in that: The specific steps include the following: Step 1: Cut the rock block to the required size for the test and pre-drill holes for placing the heating rod (8); Step 2: Select a mold of the corresponding size according to the size of the rock block, place the pre-processed rock block in it, then pour concrete into the mold, vibrate, and let it stand. Step 3: Adjusting the dimensions of the maintenance device Depending on the size of the specimen to be cured, the upper and lower sliding partitions (4) should be replaced accordingly. After the replacement is completed, the airtightness of the two curing chambers should be checked. Step 4: Place the maintenance device away from the power source, then connect the water source to the external water pipe and turn on the sewer. Then fill the water tank with water until the water level reaches the required height. Turn on the power switch of the maintenance device. After the machine is running normally, wait for the temperature and humidity to reach the required levels. Step 5: Curing of Concrete Specimens Immediately after demolding, the specimen is placed in the two-cavity rock-concrete composite specimen differential curing device. Open the external door and the internal heat-insulating glass door (3) of the curing device, slide the two upper and lower sliding partitions (4) apart in advance to leave space for placing items, place the demolded rock-concrete composite specimen on the shelf (5), operate the upper and lower sliding partitions (4) again to make the two upper and lower sliding partitions (4) contact, and clamp the rock-concrete composite specimen by inserting the plug-in block (44). The surface of the rock-concrete composite specimen should be kept moist, but the specimen should not be directly rinsed with water. Step Six: Data Controller Setup After the specimen is placed in the curing chamber (2), the connector (17) on the thermometer (9) is connected to the data connector (16), the door of the curing device is closed, and the data controller (19) will display the temperature and humidity values. When the temperature in the two curing chambers is high or low, the data controller (19) controls the water pump (12) and the heating rod (8) to adjust automatically. The temperature change of the specimen is monitored in real time through the data controller (19). Step 7: Complete maintenance When the required curing time is reached, the curing time is removed and used for subsequent physical and mechanical performance tests and inspections.

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