Alkali-activated material weathering test device

Abstract

The invention discloses an alkali-activated material weathering test device, which comprises a box body, a gas washing mechanism and an exhaust mechanism, a partition plate is arranged in the box body to divide the internal space of the box body into two parts, and the two parts are communicated through a space below the partition plate. Wherein one space is used for placing an alkali-activated material test block, a gas inlet and a gas outlet are formed in the box body, the gas inlet is connected with a gas outlet of the gas washing mechanism, the gas outlet is connected with a pipe body of a funnel-shaped gas outlet part of the gas exhaust mechanism, and gas in the box body is led out of the box body by utilizing a gas suction fan. And due to the artificially manufactured venturi tube, external gas can quickly circulate. The device is suitable for exploring the influence of the weathering phenomenon of the alkali-activated material after the acidic gas in the environmental condition is eliminated.

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 testing device. Background Art

[0002] As a green and low-carbon building material, alkali-activated materials have the advantages of high early strength, fire resistance, acid resistance, corrosion resistance and excellent heavy metal curing effect compared with traditional building materials. However, it has problems such as fast curing, large shrinkage rate and surface weathering, and has not been widely promoted and used. Among them, weathering is an important problem in the use of alkali-activated materials.

[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 for detecting the weathering of alkali-activated materials.

[0004] Therefore, the prior art 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 in the prior art.

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

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

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

[0009] The gas washing mechanism comprises a sealed container, an air inlet pipe and an air outlet pipe; the container contains a solution for removing acidic gas, 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-induced 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 comprises: a temperature and humidity sensor, wherein the temperature and humidity sensor 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 for performing 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-induced material weathering test device, the funnel-shaped air outlet portion further includes an air suction fan support platform, and the air suction fan support platform 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, wherein the partition includes a partition body and a sub-plate arranged at the lower part of the partition body, and when the forces on both sides of the sub-plate are unbalanced, the sub-plate swings to the side with less force.

[0019] As a preferred technical solution, in the alkali-induced 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 with the prior art, the alkali-activated material weathering test device provided by the present invention can divide the sealed cavity into two parts by setting a partition inside the box, and cooperate with the exhaust mechanism to create a pressure gradient in the sealed cavity, so that the alkali-activated material test block is in the experimental gas, ensuring the accuracy of the experimental results. The washing mechanism can eliminate the influence of the acidic gas in the test gas on the weathering phenomenon of the alkali-activated material. The device is suitable for exploring the influence of the weathering phenomenon of the alkali-activated material after eliminating the acidic gas in the environmental conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an overall schematic diagram of the alkali-induced 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 three-dimensional diagram 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 effect of the present invention clearer and more specific, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used 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 sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and do not mean a necessary sequence, unless otherwise specified that a certain sequence 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, a scrubbing mechanism 20 and an exhaust mechanism 30, wherein 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, and 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, and 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 with transparent glass. By using transparent materials to prepare the box, it is convenient to intuitively observe the changes in the alkali-excited material test block during the experiment.

[0034] Combination 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 disposed at the lower part 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 disposing a sub-plate 112 at the lower part of the partition body 111, the pressure in the two cavities inside the box body 10 can be assisted to adjust by utilizing the swing of 112. 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 the two sides of the box body 10 are movably arranged.

[0036] In one implementation of the present invention, a shaft is disposed at the end of the partition body 111, and the sub-plate 112 is disposed on the shaft. In another implementation, a reset spring (not shown) may be sleeved on the shaft to reset the sub-plate 112 using the reset spring.

[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 gas flow rate flowing into the box body 10, or adjust the speed of the suction fan of the exhaust mechanism.

[0038] In the present invention, a temperature and humidity sensor 150 is disposed in the first chamber 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, etc., which are used to detect the temperature and humidity in the first cavity 120. A constant temperature and humidity controller (not shown) is also provided in the first cavity 120. The constant temperature and humidity controller is provided in the first cavity and is used to perform timed heating and timed humidification on the first cavity. The alkali-excited material test block in the first cavity is kept in a relatively constant temperature and humidity range to avoid the influence of temperature and humidity fluctuations on the experimental results. At the same time, the alkali-excited material can also be subjected to weathering tests under different 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 gas, one end of the air inlet pipe 210 extends into the solution, and 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. As an example, it can be regarded as a scrubbing bottle, which contains a liquid for removing acidic gas, that is, an alkaline washing method, using a high-strength alkaline solution prepared with sodium hydroxide and sodium carbonate or trisodium phosphate to soften, loosen, emulsify and disperse sediments. Some surfactants are often added to increase the cleaning effect. It is commonly used for removing oil and dirt from boilers and silicate scale of alkaline deposits. The specific formula can be adjusted according to the different cleaning objects, generally sodium hydroxide (NaOH): 5-10% (weight percentage), sodium carbonate (Na2CO3): 2-5%, etc. The present invention uses Ca(OH)2 for the purpose of better generating 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 dissolution equilibrium, calcium has a tendency 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 is the precipitation dissolution equilibrium constant, that 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 of 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 clear solution, a white precipitate was produced, indicating 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 gas washing mechanism 20. The gas storage container plays the role of both gas storage and buffering. It should be noted that when the volume of the alkali-activated material test block in the experiment is relatively large, the size of the corresponding box should also be changed accordingly, and the amount of gas required for the experiment is relatively large. If the gas in the gas washing mechanism is directly introduced into the box, pressure fluctuations are likely to occur, and the gas washing mechanism is also prone to 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 air outlet 310. The air intake fan 300 is arranged at the end of a bucket body 311 of the funnel-shaped air outlet 310. The tube body 312 of the funnel-shaped air outlet is connected to the air outlet. The air intake fan has a diameter of 12 cm, a voltage of 12 V, a speed of 0-3250 rpm, and is equipped with a debugging adapter to adjust the air volume and air pressure.

[0050] In the present invention, the funnel-shaped air outlet 310 further includes an air suction fan support platform 313, which is arranged at the end of the bucket body 311 and is integrally formed with the bucket body 311 (such as being printed and formed by 3D printing technology). The air suction fan support platform 313 is a frame formed by four plates that are perpendicular to each other, which is drawn after measuring the size of the air suction fan in the early stage, and is mainly used to carry and fix the fan. The second part is a funnel-shaped mold (bucket body), and the third part is a narrower inlet (tube body). The third part is mainly connected to the hose of the air outlet. The design of this device mainly utilizes the Venturi effect; specifically: when a fluid (gas or liquid) flows through a gradually narrowing pipe, according to the Bernoulli principle, the flow rate will increase, while the static pressure will decrease. This is because the total energy of the fluid (including kinetic energy, potential energy and pressure energy) remains unchanged. Specifically, when the pipe becomes narrower, the fluid must accelerate through the narrow part, resulting in an increase in kinetic energy; in order to maintain the conservation of total energy, the pressure energy (static pressure) of the fluid will decrease. The box body and the second part of the funnel-shaped mold are equivalent to the wider part, while the middle hose and the third part of the narrow inlet are equivalent to a whole. Thus, an artificially manufactured Venturi tube is realized, and 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 is arranged in the sealed cavity, the partition divides the sealed cavity into a first cavity and a second cavity, the first cavity is connected to the second cavity; an air inlet is arranged on the side wall of the first cavity, and an air outlet is arranged on the side wall of the second cavity; the first cavity is used to hold an alkali-activated material test block; a 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, the air suction fan is arranged at the end of the bucket body of the funnel-shaped air outlet, and the tube body of the funnel-shaped air outlet is connected to the air outlet. The experimental device provided by the present invention utilizes an alkali washing method to remove acidic gases in the air, and is suitable for exploring the influence of alkali-induced material weathering phenomena 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 ordinary technicians in this field, 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, a partition is arranged in the sealed cavity, the partition divides the sealed cavity into a first cavity and a second cavity, the first cavity is connected with the second cavity; an air inlet is arranged on the side wall of the first cavity, and an air outlet is arranged on the side wall of the second cavity; the first cavity is used to hold an alkali-excited material test block; The gas washing mechanism comprises a sealed container, an air inlet pipe and an air outlet pipe; the container contains a solution for removing acidic gas, 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 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.

2. The alkali-induced 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-induced 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-induced material weathering test device according to claim 3, characterized in that: Also includes: A constant temperature and humidity controller is arranged 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 solution contains calcium ions, hydroxide ions and carbonate ions.

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

7. The alkali-induced material weathering test device according to claim 1, characterized in that: The alkali-activated material weathering test device also includes: 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.

8. The alkali-induced material weathering test device according to claim 1, characterized in that: 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.

9. The alkali-induced material weathering test device according to claim 8, characterized in that: A rotating shaft is arranged at the end of the partition body, and the auxiliary plate is arranged on the rotating shaft.

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

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