Alkali-induced material weathering test device

Abstract

The present invention discloses an alkali-excited material weathering test device, comprising: a box body, an air washing mechanism and an exhaust mechanism. A partition is provided in the box body to divide the internal space of the box body into two parts, and the two parts are connected through the space under the partition. One of the spaces is used to place an alkali-excited material test block. An air inlet and an air outlet are provided on the box body. The air inlet is connected to the air outlet of the air washing mechanism, and the air outlet is connected to the tube body of the funnel-shaped air outlet part of the exhaust mechanism. An air suction fan is used to lead the gas in the box body out of the box body. Due to the artificially manufactured Venturi tube, the external gas can circulate rapidly. The device is suitable for exploring the influence of the weathering phenomenon of alkali-excited materials after excluding acidic gases in environmental conditions.

Description

Technical Field

[0001] The invention relates to the technical field of alkali-activated material degradation performance testing, in particular to an alkali-activated material weathering test device. Background Art

[0002] Alkali-activated materials (ALMs) are green, low-carbon building materials. Compared to traditional building materials, they offer advantages such as high early strength, fire resistance, acid resistance, corrosion resistance, and excellent heavy metal curing performance. However, they suffer from issues such as rapid curing, high shrinkage, and surface weathering, hindering their widespread use. Weathering is a significant issue with ALMs during use.

[0003] Weathering is a phenomenon that is mainly visible to the naked eye on the surface of materials. It often occurs on the surface and appears as white flocculent deposits. Currently, there is no experimental device to detect the weathering of alkali-activated materials.

[0004] Therefore, the existing technology needs to be further improved and enhanced. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides an alkali-activated material weathering test device, aiming to solve the problem that there is no experimental device specifically for alkali-activated material weathering detection.

[0006] The technical solutions adopted by the present invention to solve the above technical problems are as follows:

[0007] An alkali-induced material weathering test device, comprising:

[0008] The box body has a sealed cavity, wherein a partition is provided in the sealed cavity, and the partition divides the sealed cavity into a first cavity and a second cavity, wherein the first cavity is connected to the second cavity; an air inlet is provided on a side wall of the first cavity, and an air outlet is provided on a side wall of the second cavity; the first cavity is used to hold a test block of an alkali-activated material;

[0009] The gas scrubbing mechanism comprises a sealed container, an air inlet pipe, and an air outlet pipe; the container contains a solution for removing acidic gases, one end of the air inlet pipe extends into the solution, one end of the air outlet pipe extends into the container and is located above the liquid level of the solution; the other end of the air outlet pipe is connected to the air inlet;

[0010] The exhaust mechanism comprises an air suction fan and a funnel-shaped air outlet portion, wherein the air suction fan is arranged at the end of the bucket body of the funnel-shaped air outlet portion, and the tube body of the funnel-shaped air outlet portion is connected to the air outlet.

[0011] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. Through the following preferred technical solutions, the objectives and beneficial effects of the present invention can be better achieved and realized.

[0012] As a preferred technical solution, the alkali-activated material weathering test device further comprises: an air pressure monitor, which is arranged on the box body and is used to monitor the gas pressure in the sealed cavity.

[0013] As a preferred technical solution, the alkali-activated material weathering test device further includes a temperature and humidity sensor, which is disposed in the first cavity.

[0014] As a preferred technical solution, the alkali-activated material weathering test device further includes: a constant temperature and humidity controller, which is arranged in the first cavity and is used to perform timed heating and timed humidification on the first cavity.

[0015] As a preferred technical solution, in the alkali-activated material weathering test device, the solution contains calcium ions, hydroxide ions and carbonate ions.

[0016] As a preferred technical solution, in the alkali-activated material weathering test device, the funnel-shaped air outlet portion further includes an air suction fan support platform, which is arranged at the end of the bucket body and is integrally formed with the bucket body.

[0017] As a preferred technical solution, the alkali-activated material weathering test device further comprises: a gas storage container, the gas inlet of the gas storage container is connected to one end of the gas outlet pipe located outside the sealed container; the gas outlet of the gas storage container is connected to the gas inlet on the side wall of the first cavity.

[0018] As a preferred technical solution, the alkali-activated material weathering test device is described, wherein the partition includes a partition body and a sub-plate arranged at the lower part of the partition body, and when the sub-plate is subjected to unbalanced forces on both sides, it swings toward the side with less force.

[0019] As a preferred technical solution, in the alkali-activated material weathering test device, a rotating shaft is provided at the end of the partition body, and the sub-plate is provided on the rotating shaft.

[0020] As a preferred technical solution, in the alkali-induced material weathering test device, the box is a transparent box.

[0021] Beneficial Effects: Compared to existing technologies, the alkali-activated material weathering test device provided by this invention divides the sealed chamber into two parts by installing a partition inside the chamber. Combined with a venting mechanism, this device can create a pressure gradient within the sealed chamber, immersing the alkali-activated material specimen in the test gas and ensuring accurate experimental results. The incorporation of a scrubbing mechanism eliminates the effects of acidic gases in the test gas on the weathering of alkali-activated materials. This device is suitable for investigating the effects of alkali-activated material weathering after removing acidic gases from the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an overall schematic diagram of the alkali-activated material weathering test device provided by the present invention;

[0023] Figure 2 It is a schematic diagram of the partition structure of the present invention;

[0024] Figure 3 is a perspective view of the exhaust mechanism of the present invention;

[0025] Figure 4 is a top view of the exhaust mechanism of the present invention;

[0026] Figure 5 is a cross-sectional view of the exhaust mechanism of the present invention;

[0027] Figure 6 Schematic diagram of the internal structure of the temperature and humidity sensor in the present invention. DETAILED DESCRIPTION

[0028] The present invention provides an alkali-induced material weathering test device. To make the purpose, technical solution, and effects of the present invention more clear and explicit, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only for the purpose of explaining the present invention and are not intended to limit the present invention.

[0029] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementation methods. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various orders in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a necessary order unless otherwise specified that a certain order must be followed. The serial numbers themselves, such as "first", "second", etc., assigned to the components herein are only used to distinguish the objects described and do not have any order or technical meaning.

[0030] like Figure 1As shown, the alkali-activated material weathering test device provided by the present invention includes: a box 10, an air washing mechanism 20, and an exhaust mechanism 30. The specific shape and size of the box 10 can be designed according to actual needs. In the present invention, a rectangular parallelepiped is used as an example to explain the technical solution provided by the present invention. The box 10 has a sealed cavity inside. The internal space of the box 10 is divided into two parts by setting a partition 110, namely a first cavity 120 and a second cavity 130. The volumes of the two cavities can be the same or one large and the other small. In the present invention, the first cavity 120 is used to hold the alkali-activated material test block 140. The specific size and shape of the alkali-activated material test block 140 are not limited here.

[0031] An air inlet 121 is provided on the side wall of the first cavity 120, and an air outlet 131 is provided on the side wall of the second cavity 130, wherein the air inlet 121 is used to connect with the gas washing mechanism to introduce the gas cleaned by the gas washing mechanism into the interior of the box body 10, and the air outlet 131 is used to connect with the tube body of the funnel-shaped air outlet part of the exhaust mechanism, and the gas inside the box body 10 is led out of the box body 10 through the suction fan, so as to keep the pressure inside the box body 10 within a reasonable range to ensure the normal progress of the experiment.

[0032] In the present invention, the air inlet 121 and the air outlet 131 are both located at the upper part of the box body 10. By arranging the air inlet 121 and the air outlet 131 at the upper part in conjunction with the partition, the gas inside the box body 10 can be placed in a flow area and a static area, wherein the area close to the air inlet 121 and the air outlet 131 is defined as the flow area, and the middle and lower area of ​​the box body 10 is the static area. The alkali-excited material test block is located in the static area, which can avoid obvious fluctuations in the gas flowing through the alkali-excited material test block. If the gas flowing through the alkali-excited material test block fluctuates significantly, it will affect the observation of the experimental results.

[0033] In the present invention, the box 10 can be made of transparent materials, such as transparent glass, transparent plastic, and of course it can also be made of a metal frame combined with transparent glass. By using transparent materials to prepare the box, it is convenient to intuitively observe the changes occurring in the alkali-excited material test block during the experiment.

[0034] Combine Figure 2In the present invention, the partition 110 can be a quadrilateral plate, and its size can be actually set according to the size of the box. The material of the partition 110 can be plastic, rubber, glass, etc. The partition 110 can be connected to the inside of the box 10 through a card slot (for example, a card groove (not shown) can be provided on the inner wall of the box, and the partition 110 is inserted into the groove), or it can be fixed by gluing. The partition 110 is fixed in the box 10, and its three edges are required to be in contact with the top and two side edges of the box, and a certain space is reserved between the other edge and the bottom of the box 10, so that the gas inside the first cavity 120 can flow into the second cavity 130.

[0035] In the present invention, the partition 110 includes a partition body 111 and a sub-plate 112 provided at the lower portion of the partition body 111. When the forces on both sides are unbalanced, the sub-plate 112 swings toward the side with less force. By providing a sub-plate 112 at the lower portion of the partition body 111, the swinging of 112 can be used to assist in adjusting the pressure in the two cavities inside the box body 10. For example, when the pressure on one side of the first cavity 120 is greater than the pressure in the second cavity 130, the sub-plate 112 swings toward the second cavity 130 to achieve the purpose of pressure relief. It is easy to understand that when the partition 110 contains the sub-plate 112, the edges of the sub-plate 112 close to both sides of the box body 10 are movably provided.

[0036] In one embodiment of the present invention, a shaft is provided at the end of the partition body 111, and the sub-plate 112 is provided on the shaft. In another embodiment, a return spring (not shown) can be sleeved on the shaft to return the sub-plate 112 to its original position.

[0037] In the present invention, an air pressure detector (not shown) is also provided on the box body 10 for detecting the gas pressure inside the box body 10. The air pressure detector can be arranged in the area where the first cavity and / or the second cavity are located. By detecting the pressure inside the box body 10, the detection result can be fed back to the main controller (not shown). The main controller can be understood as a main control cabinet, and the main controller adjusts the pressure inside the box body 10. Specifically, it can control the flow rate of gas flowing into the box body 10, or adjust the speed of the intake fan of the exhaust mechanism.

[0038] In the present invention, a temperature and humidity sensor 150 is provided in the first cavity 120, and its internal structure is as follows: Figure 6The device shown includes a data storage module, a TF card, a power supply, a carbon dioxide probe, a temperature and humidity probe, and the like, for monitoring the temperature and humidity within the first chamber 120. A constant temperature and humidity controller (not shown) is also provided within the first chamber 120 and is configured to periodically heat and humidify the first chamber. This maintains the alkali-activated material specimen within the first chamber within a relatively constant temperature and humidity range, preventing fluctuations in temperature and humidity from affecting the experimental results. Furthermore, weathering tests can be performed on the alkali-activated material under varying temperature and humidity conditions as needed.

[0039] In the present invention, the scrubbing mechanism 20 comprises a sealed container 200, an air inlet pipe 210, and an air outlet pipe 220. The container 200 contains a solution for removing acidic gases. One end of the air inlet pipe 210 extends into the solution, while one end of the air outlet pipe 220 extends into the container 200 and is located above the liquid level of the solution. The other end of the air outlet pipe is connected to the air inlet. For example, a scrubbing bottle can be considered, containing a liquid for removing acidic gases, namely, an alkaline cleaning method, using a high-strength alkaline solution made of sodium hydroxide and sodium carbonate or trisodium phosphate to soften, loosen, emulsify, and disperse deposits. Surfactants are often added to enhance the cleaning effect. This is commonly used to remove oil stains from boilers and silicate scale from alkaline deposits. The specific formulation can be adjusted depending on the cleaning target, but generally includes sodium hydroxide (NaOH): 5-10% (by weight) and sodium carbonate (Na2CO3): 2-5%. The present invention uses Ca(OH)2 to better form calcium carbonate precipitation, which is convenient for observation and cleaning. It can also be replaced by sodium phosphate (Na3PO4): 1-3% or sodium carbonate.

[0040] Sodium hydroxide and calcium hydroxide powders provide an alkaline environment (pH>10) because According to the solubility equilibrium, calcium tends to transform into calcium carbonate. The equation is as follows:

[0041] Ca(OH)2=Ca 2+ +2OH - (1)

[0042] NaOH=Na + +OH - (2)

[0043]

[0044] 2NaOH+CO2=Na2CO3+H2O (4)

[0045] Na2CO3+Ca(OH)2=CaCO3+2NaOH (5)

[0046] K SP The precipitation-dissolution equilibrium constant is the equilibrium constant of a substance in the dissolution and equilibrium state. The larger its value, the greater the concentration of the substance in the dissolved state, and the smaller the possibility of precipitation, and vice versa. From the above relationship between the precipitation-dissolution equilibrium constant, it can be seen that CaCO3 precipitation is the easiest to form.

[0047] Since in an alkaline environment, the reaction direction of formula (3) is positive, that is, it promotes the Gradually increasing, the reaction of formula (5) increases in the positive direction, thereby promoting the formation of solution precipitation. One day after the device was turned on, the pH of the solution in the washing bottle was tested and the results showed that the pH was between 12-14. Combined with the white precipitation of the clear solution, it showed that the carbon dioxide was successfully absorbed by the solution and the experimental results were successful.

[0048] In the present invention, the alkali-activated material weathering test device also includes a gas storage container 40, which is used to store the gas cleaned by the scrubbing mechanism 20. The gas storage container not only plays the role of gas storage, but also plays the role of buffering. It should be noted that when the volume of the alkali-activated material test block to be tested is relatively large, the size of the corresponding box should also be changed accordingly, and the amount of gas required for the experiment is also relatively large. If the gas in the scrubbing mechanism is directly introduced into the box, pressure fluctuations are likely to occur, and the scrubbing mechanism is also likely to have abnormalities. The cleaned gas also contains acidic gas. If the gas is directly introduced into the box, it will cause irreversible effects on the experimental results.

[0049] like Figures 3 to 5 As shown, the exhaust mechanism 30 includes an air intake fan 300 and a funnel-shaped outlet 310. The air intake fan 300 is mounted at the end of a funnel-shaped outlet 310's body 311, and a tube 312 of the funnel-shaped outlet connects to the outlet. The air intake fan has a diameter of 12 cm, operates at 12V, and has a speed range of 0-3250 rpm. A debugging adapter is included to adjust the air volume and pressure.

[0050] In the present invention, the funnel-shaped air outlet 310 also includes an air intake fan support 313, which is positioned at the end of the funnel body 311 and integrally formed with the funnel body 311 (e.g., it can be 3D printed). The air intake fan support 313 is a frame formed by four perpendicular panels, each two perpendicular to the other. Designed based on pre-measured fan dimensions, it primarily supports and secures the fan. The second section is the funnel-shaped mold (the funnel body), and the third section is the narrower inlet (the tube body). This third section primarily connects to the outlet hose. This device's design primarily utilizes the Venturi effect. Specifically, when a fluid (gas or liquid) flows through a gradually narrowing pipe, according to Bernoulli's principle, the flow rate increases while the static pressure decreases. This is because the total energy of the fluid (including kinetic energy, potential energy, and pressure energy) remains constant. Specifically, as the pipe narrows, the fluid must accelerate through the narrowing, increasing its kinetic energy. To maintain total energy conservation, the fluid's pressure energy (static pressure) decreases. The box and the second funnel-shaped mold are equivalent to the wider part, while the middle hose and the third narrow inlet are equivalent to a whole. This realizes an artificial Venturi tube, so that the external gas can flow quickly.

[0051] In summary, the present invention provides an alkali-activated material weathering test device, comprising: a box body having a sealed cavity, a partition being provided in the sealed cavity, the partition dividing the sealed cavity into a first cavity and a second cavity, the first cavity being connected to the second cavity; an air inlet being provided on the side wall of the first cavity, and an air outlet being provided on the side wall of the second cavity; the first cavity being used to hold an alkali-activated material test block; an air washing mechanism comprising a sealed container, an air inlet pipe and an air outlet pipe; a solution for removing acidic gas is contained in the container, one end of the air inlet pipe extends into the solution, and one end of the air outlet pipe extends into the container and is located above the liquid level of the solution; the other end of the air outlet pipe is connected to the air inlet; an exhaust mechanism comprising an air suction fan and a funnel-shaped air outlet portion, the air suction fan being provided at the end of the bucket body of the funnel-shaped air outlet portion, and the tube body of the funnel-shaped air outlet portion being connected to the air outlet. The experimental device provided by the present invention uses an alkali washing method to remove acidic gases in the air, and is suitable for exploring the influence of alkali-induced material weathering after removing acidic gases in environmental conditions.

[0052] It should be understood that the application of the present invention is not limited to the above examples. For those skilled in the art, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. An alkali-induced material weathering test device, characterized in that: include: The box body has a sealed cavity, wherein a partition is provided in the sealed cavity, and the partition divides the sealed cavity into a first cavity and a second cavity, wherein the first cavity is connected to the second cavity; an air inlet is provided on a side wall of the first cavity, and an air outlet is provided on a side wall of the second cavity; the first cavity is used to hold a test block of an alkali-activated material; The gas scrubbing mechanism comprises a sealed container, an air inlet pipe, and an air outlet pipe; the container contains a solution for removing acidic gases, one end of the air inlet pipe extends into the solution, one end of the air outlet pipe extends into the container and is located above the liquid level of the solution; the other end of the air outlet pipe is connected to the air inlet; The exhaust mechanism includes an air suction fan and a funnel-shaped air outlet portion, wherein the air suction fan is arranged at the end of the funnel-shaped air outlet portion, and the tube body of the funnel-shaped air outlet portion is connected to the air outlet; The solution contains calcium ions, hydroxide ions and carbonate ions; The alkali-activated material weathering test device further includes: a gas storage container, wherein the gas inlet of the gas storage container is connected to one end of the gas outlet pipe located outside the sealed container; the gas outlet of the gas storage container is connected to the gas inlet on the side wall of the first cavity; The partition includes a partition body and a sub-plate arranged at the lower part of the partition body. When the forces on both sides of the sub-plate are unbalanced, the sub-plate swings toward the side with less force. A rotating shaft is provided at the end of the partition body, and the auxiliary plate is provided on the rotating shaft.

2. The alkali-activated material weathering test device according to claim 1, characterized in that: Also includes: An air pressure monitor is provided on the box body and is used to monitor the gas pressure in the sealed cavity.

3. The alkali-activated material weathering test device according to claim 1, characterized in that: Also includes: A temperature and humidity sensor is disposed in the first cavity.

4. The alkali-activated material weathering test device according to claim 3, characterized in that: Also includes: A constant temperature and humidity controller is provided in the first cavity and is used for performing timed heating and timed humidification on the first cavity.

5. The alkali-induced material weathering test device according to claim 1, characterized in that: The funnel-shaped air outlet portion further includes an air suction fan supporting platform, which is arranged at the end of the bucket body and is integrally formed with the bucket body.

6. The alkali-activated material weathering test device according to claim 1, characterized in that: The box is a transparent box.

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