Device for automatically collecting soaking expansibility of steel slag base material

Abstract

The utility model discloses a device for automatically collecting soaking expansibility of a steel slag base material, and belongs to the technical field of geotechnical tests. Comprising a water tank, a test-piece test mold, a control system and a strain acquisition system, the test piece test mold is placed in the water tank, an inner cavity of the test piece test mold is used for containing a steel slag base material, a floating device is arranged in the test piece test mold and comprises a pressing plate and a vertical pressing rod fixed above the pressing plate, and the pressing plate is pressed on the steel slag base material, can vertically move along with expansion of the steel slag base material and drives the vertical pressing rod to change the height; the strain acquisition system comprises a displacement sensor, and the displacement sensor is installed on a support above the test piece test mold and used for monitoring the height value changed by the vertical pressing rod; the control system communicates with the heating device in the water tank. According to the utility model, the strain acquisition system is adopted to collect the expansion deformation data of the steel slag base material, thereby realizing the automatic acquisition of the immersion expansion performance of the steel slag base material and improving the automation level of the test.

Description

Technical Field

[0001] The utility model relates to the technical field of geotechnical tests, and particularly relates to a device for automatically collecting the water immersion expansibility of steel slag base course materials. Background Technique

[0002] Steel slag is an industrial waste residue formed by the sintering of residual fluxes and oxides during the steelmaking process and the reaction with elements such as iron, aluminum, magnesium, manganese, sulfur, and phosphorus in the molten steel. The application of steel slag as a substitute for natural aggregates in base course materials in highway engineering is an effective way to realize the recycling of solid waste, and at the same time, it can also reduce the demand and consumption of natural aggregates. However, due to the presence of components such as f-CaO and f-MgO in steel slag, it will expand in volume when encountering water, and excessive expansion stress will cause cracks in the highway base course materials, affecting the service life of the highway. Therefore, it is necessary to accurately measure the water immersion expansion level of steel slag to guide the application of each batch of steel slag.

[0003] At present, to test the water immersion expansion level of steel slag base course materials, it mainly relies on GB / T24175-2009 "Test Method for the Stability of Steel Slag". The main equipment is a constant temperature water bath and a dial gauge. It is found in practice that due to the lack of exclusive test equipment, the water temperature control is not accurate enough, and the contact between the dial gauge and the contact head is unstable under large expansion amounts, resulting in large fluctuations in the measured test results, and the repeatability and reproducibility of the test results are poor. Ultimately, it affects the qualification determination of the application of steel slag in base course materials. Content of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide a device for automatically collecting the water immersion expansibility of steel slag base course materials, which can automatically heat and maintain a constant temperature, and automatically collect the water immersion expansibility data of steel slag base course materials.

[0005] In order to achieve the above purpose, the utility model is realized through the following technical solutions.

[0006] The utility model provides a device for automatically collecting the water immersion expansibility of steel slag base course materials, including a water tank, a specimen mold, a control system, and a strain acquisition system;

[0007] The specimen mold is placed in the water tank. The inner cavity of the specimen mold is used to hold the steel slag base course materials. There is a floating device in the specimen mold. The floating device includes a pressing plate and a vertical pressing rod fixed above the pressing plate. The pressing plate presses on the steel slag base course materials and can move vertically in the inner cavity of the specimen mold as the steel slag base course materials expand, driving the vertical pressing rod to change its height;

[0008] The strain acquisition system includes a displacement sensor. The displacement sensor is installed on a bracket above the specimen mold and is used to monitor the height value changed by the vertical pressing rod;

[0009] The control system is connected to the heating device in the water tank to adjust the temperature of the water tank.

[0010] Optionally, a plurality of specimen molds are placed in the water tank.

[0011] Optionally, the inner cavity of the specimen mold opens to the upper surface of the specimen mold, a cover plate is installed on the upper surface, and there is a through hole on the cover plate for the vertical pressure bar to extend out.

[0012] Optionally, the pressing plate can cover the inner cavity of the specimen mold, the vertical pressure bar is connected to the central position of the upper surface of the pressing plate, and the through hole is located at the center of the inner cavity opening.

[0013] Optionally, the cover plate is used to cover the inner cavity opening, the cover plate includes a first cover plate and a second cover plate, the rotation axis of the first cover plate is located on one side of the upper surface of the specimen mold, the rotation axis of the second cover plate is located on the other side of the upper surface of the specimen mold, and the covering ranges of the first cover plate and the second cover plate coincide at the contact position between the two.

[0014] Optionally, the cover plate has a stepped joint, so that the gap between the cover plates is minimized after the first cover plate and the second cover plate are overlapped with each other.

[0015] Optionally, the bracket is in a Г shape, and the displacement sensor is arranged above the through hole of the cover plate.

[0016] Optionally, the strain acquisition system includes a storage device, and the storage device is connected to the displacement sensor for storing the displacement data obtained by the displacement sensor.

[0017] Optionally, the water tank is connected to a circulating water pump, and the circulating water pump is used to circulate the water in the water tank.

[0018] Optionally, the inner surface of the water tank is an inner guard plate of the water tank body, the outer surface of the water tank is an outer guard plate of the water tank body, and the heat insulation material layer of the water tank is arranged between the outer guard plate and the inner guard plate of the water tank body.

[0019] The beneficial effects of the present utility model are as follows:

[0020] 1. The present utility model uses the electric heating tube controlled by the control system to adjust the temperature in the water tank, and uses the strain acquisition system to collect the expansion deformation data of the steel slag base material, realizing the all-weather automatic acquisition of the water immersion expansion performance of the steel slag base material, greatly improving the automation level of the test, improving the accuracy of the experiment, and reducing the labor intensity.

[0021] 2. The present utility model realizes the precise control of the temperature in the water tank through the circulating heating water tank, the heat insulation material layer of the water tank and the spliced cover plate, improving the accuracy and reliability of the test results.

[0022] 3. The device structure of the present utility model can also be used for the volume stability of base materials made of weathered sand, nickel slag, coal gangue, etc., with high versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The attached drawings forming a part of this specification are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0024] In the figures: The distances or dimensions between each part are exaggerated for showing the positions of each part, and the schematic diagrams are only for illustration.

[0025] Figure 1 is a schematic structural diagram of the device for automatically collecting the water immersion expansibility of the steel slag base material in Embodiment 1;

[0026] Figure 2 is a schematic structural diagram of the specimen mold in Embodiment 1;

[0027] Figure 3 is a schematic structural diagram of the heating pipe and the bracket in the water tank in Embodiment 1.

[0028] Among them, 1. water tank; 2. specimen mold; 3. console; 4. control system; 5. strain acquisition system; 6. cable; 7. bracket; 8. displacement sensor; 9. steel slag base material; 10. pressing plate; 11. vertical pressing rod; 12. electric heating pipe; 14. cover plate 1; 15. cover plate 2. SPECIFIC EMBODIMENTS

[0029] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0030] Embodiment 1

[0031] A device for automatically collecting the water immersion expansibility of the steel slag base material, as Figure 1 shown, includes a water tank 1, a specimen mold 2, a control system 4, and a strain acquisition system 5;

[0032] The specimen mold 2 is placed in the water tank 1. As Figure 2 shown, the inner cavity of the specimen mold 2 is used to hold the steel slag base material 9. There is a floating device in the specimen mold 2. The floating device includes a pressing plate 10 and a vertical pressing rod 11 fixed above the pressing plate 10. The pressing plate 10 presses on the steel slag base material 9 and can vertically move in the inner cavity of the specimen mold 2 as the steel slag base material 9 expands, driving the vertical pressing rod 11 to change its height;

[0033] As Figure 1 shown, the strain acquisition system 5 includes a displacement sensor 8. The displacement sensor 8 is installed on the bracket 7 above the specimen mold 2 and is used to monitor the height value changed by the vertical pressing rod 11.

[0034] The control system 4 is connected to the heating device in the water tank 1 to adjust the temperature in the water tank 1.

[0035] With such a setting, the change in the volume of the steel slag base material 9 in the inner cavity can be reflected by the change in the height of the vertical pressure rod 11, so that the expansion performance of the steel slag base material 9 can be accurately measured by the displacement sensor 8.

[0036] A plurality of specimen molds 2 are placed in the water tank 1, and the distances between the plurality of specimen molds 2 are the same and the heat-receiving states are the same.

[0037] As Figure 3 shown, the heating device in the water tank 1 is an electric heating tube 12, and the electric heating tubes 12 are distributed at the inner bottom of the water tank 1 and on the sides of the specimen molds 2 for uniformly heating the specimen molds 2 to ensure the accuracy of the experimental environment temperature of the steel slag base material 9.

[0038] As Figure 2 shown, the inner cavity of the specimen mold 2 opens to the upper surface of the specimen mold 2, a cover plate is installed on the upper surface, and there is a through hole on the cover plate for the vertical pressure rod 11 to extend out. The cover plate is used to maintain the temperature inside the specimen mold 2, and the through hole should be as small as possible to prevent the loss of the inner cavity temperature through the through hole.

[0039] The pressing plate 10 can cover the inner cavity of the specimen mold 2, the vertical pressure rod 11 is connected to the central position of the upper surface of the pressing plate 10, and the through hole of the cover plate is located at the center of the inner cavity opening, which can press the steel slag base material 9 under the pressing plate 10 and make the length of the gas flow path in the heat convection process as long as possible to provide a heat preservation effect.

[0040] The cover plate is used to cover the inner cavity opening. The cover plate includes a cover plate one 14 and a cover plate two 15. The rotation axis of the cover plate one 14 is located on one side of the upper surface of the specimen mold 2, and the rotation axis of the cover plate two 15 is located on the other side of the upper surface of the specimen mold 2. The covering ranges of the cover plate one 14 and the cover plate two 15 coincide at the contact position between the two. The cover plate one 14 and the cover plate two 15 can be opened relatively to facilitate loading the steel slag base material 9 into the inner cavity. At the same time, the two side cover plates overlap each other, further improving the heat preservation effect.

[0041] The cover plate one 14 and the cover plate two 15 are adhered together by magnets to prevent the cover plate from shifting during the test.

[0042] As Figure 3 shown, the bracket 7 is in a Г shape, and the displacement sensor 8 is arranged above the through hole of the cover plate for monitoring the moving distance of the top end of the vertical pressure rod 11; since the pressing plate 10 can cover the inner cavity of the specimen mold 2 and the through hole of the cover plate is located at the center of the inner cavity opening, the moving direction of the vertical pressure rod 11 is restricted to the vertical direction, and the displacement sensor 8 can accurately measure the expansion amount of the steel slag base material 9.

[0043] As Figure 1 shown, the strain acquisition system 5 includes a storage device which is connected to the displacement sensor 8 through a cable 6 and is used to store the displacement data obtained by the displacement sensor 8.

[0044] The water tank 1 is connected to a circulating water pump, and the circulating water pump is used to circulate the water in the water tank 1 to always ensure the water temperature in the water tank 1.

[0045] The water tank 1 is installed with a heat insulation material layer to further prevent heat dissipation.

[0046] As Figure 1 shown, the storage device and the control system 4 of the strain acquisition system 5 are integrated into a console 3, which is installed on one side of the water tank 1, and the heat insulation material layer of the water tank 1 is thickened on this side;

[0047] The console 3 includes a control panel to realize the input of experimental parameters and the export of experimental data.

[0048] According to the GB / T 24175-2009 "Test Method for the Stability of Steel Slag", the height of the specimen mold 2 is 12 cm. Considering the immersion height of the mold, the height of the water tank 1 body is 18 cm.

[0049] The specimen mold 2 adopts a CBR mold. To ensure that the mold does not deform in a high-temperature environment, both the bottom mold and the perforated plate of the mold are made of steel materials. Among them, the perforated plate refers to the pressing plate 10 of the floating device.

[0050] The control system 4 includes a central control device, which is used to control the heating time and heating stability of the specimen in the box body, and the control accuracy is ±0.1°C and ±0.1 min.

[0051] The acquisition range of the displacement sensor 8 is 0.001 - 10.000 cm, and the acquisition frequency is 1 time / min.

[0052] The power and distribution quantity of the electric heating tube 12 are required to raise the water temperature from room temperature to 90.0°C within 1 hour when the box body is filled with water.

[0053] The bracket 7 is made of stainless steel material that does not deform and is corrosion-resistant at high temperatures.

[0054] The cover plate is made of stainless steel material that is not easy to deform and is corrosion-resistant in a high-temperature environment; As Figure 2 shown, each spliced cover plate has a stepped joint, so that the gap between the cover plates is minimized after the cover plate one 14 and the cover plate two 15 are overlapped with each other, and at the same time, the specifications of each spliced cover plate are the same.

[0055] The inner surface of the water tank 1 is an inner lining plate of the box body, with a required thickness of about 3 mm, made of corrosion-resistant stainless steel material. During the heating process, the inside of the box body does not deform and the solder joints do not open.

[0056] The outer surface of the water tank 1 is the inner protective plate of the box body, which is made of stainless steel. Its main function is to protect the box body and the thermal insulation material.

[0057] The thermal insulation material layer of the water tank 1 is arranged between the outer protective plate and the inner protective plate of the water tank 1, and is used to reduce the heat exchange between the heated water in the box body and the outside world; the thermal insulation material includes but is not limited to porous thermal insulation materials (foamed cement), loose thermal insulation materials (glass wool, rock wool insulation felt), rubber and plastic thermal insulation materials, phenolic foam materials, and aluminum silicate thermal insulation materials.

[0058] Using the equipment of this embodiment for testing includes the following steps.

[0059] S1. After the steel slag base material 9 with a designed mix ratio is formed, it is placed in the box body of the immersion swelling test equipment. A displacement sensor 8 is installed on the support 7 of the specimen mold 2, and water is injected into the water tank 1 to a height of more than 30 mm above the specimen.

[0060] S2. Set the heating time, heating temperature, and heating days. After confirmation, the heating device and the circulation system of the equipment start to work.

[0061] S3. After the circulation system works, start the strain acquisition system 5 to make the displacement sensor 8 start to collect the immersion swelling data of the steel slag base material 9 all-weather in real time and transmit it to the central processing system for preprocessing and storage.

[0062] S4. After the device automatically completes the immersion heating and data detection and collection of the specimen, export and process and analyze the data.

[0063] In S2, according to the relevant requirements of the "Test Method for Steel Slag Stabilization" (GB / T 24175), the heating time is set to 6 h, the heating temperature is set to 90 °C, and the heating days are set to 10 days.

[0064] The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A device for automatically collecting the water expansion of steel slag base materials, characterized in that: Water tank, test piece and mold, control system and strain acquisition system; The test mold is placed in a water tank. The inner cavity of the test mold is used to hold the steel slag base material. There is a floating device in the test mold. The floating device includes a pressing plate and a vertical pressing rod fixed above the pressing plate. The pressing plate is pressed on the steel slag base material and can move vertically in the inner cavity of the test mold as the steel slag base material expands, driving the vertical pressing rod to change height. The strain acquisition system includes a displacement sensor, which is installed on a bracket above the test mold of the specimen to monitor the height value changed by the vertical pressure rod; The control system is connected to the heating device in the water tank to adjust the temperature of the water tank.

2. The device for automatically collecting water swelling properties of steel slag base materials according to claim 1, characterized in that: A plurality of test specimens and test molds are placed in the water tank.

3. The device for automatically collecting water swelling properties of steel slag base materials according to claim 2, characterized in that: The inner cavity of the test piece mold opens to the upper surface of the test piece mold, and a cover plate is installed on the upper surface. The cover plate has a through hole for the vertical pressure rod to extend out.

4. The device for automatically collecting water swelling properties of steel slag base materials according to claim 3, characterized in that: The pressing plate can cover the inner cavity of the test piece test mold, the vertical pressing rod is connected to the central position of the upper surface of the pressing plate, and the through hole is located in the center of the inner cavity opening.

5. The device for automatically collecting water swelling properties of steel slag base material according to claim 3, characterized in that: The cover plate is used to cover the inner cavity opening, and the cover plate includes cover plate one and cover plate two. The rotation axis of cover plate one is located on one side of the upper surface of the specimen mold, and the rotation axis of cover plate two is located on the other side of the upper surface of the specimen mold. The coverage range of cover plate one and cover plate two overlaps at the contact position between the two.

6. The device for automatically collecting water swelling properties of steel slag base materials according to claim 5, characterized in that: The cover plates are staggered so that the gap between the cover plates is minimized after the first cover plate and the second cover plate are overlapped with each other.

7. The device for automatically collecting water swelling properties of steel slag base materials according to claim 1, characterized in that: The bracket is in a G-shape, and the displacement sensor is arranged above the through hole of the cover plate.

8. The device for automatically collecting water swelling properties of steel slag base materials according to claim 1, characterized in that: The strain acquisition system includes a storage device, which is connected to the displacement sensor and is used to store displacement data obtained by the displacement sensor.

9. The device for automatically collecting water swelling properties of steel slag base materials according to claim 1, characterized in that: The water tank is connected to a circulating water-electric pump, and the circulating water-electric pump is used for circulating the body water in the water tank.

10. The device for automatically collecting water swelling properties of steel slag base materials according to claim 1, characterized in that: The inner surface of the water tank is an inner protective plate, the outer surface of the water tank is an outer protective plate, and the heat preservation material layer of the water tank is arranged between the outer protective plate and the inner protective plate of the water tank.

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