Industrial-grade aerated concrete block as well as preparation method and application thereof

Abstract

The invention relates to the technical field of building materials, in particular to an industrial-grade aerated concrete block as well as a preparation method and application thereof. The preparation method of the industrial-grade aerated concrete building block comprises the following steps: a plurality of building blocks obtained by cutting a green body are vertically arranged on a top layer of a partition plate at intervals, the top layer is provided with a plurality of through holes, and supporting columns are arranged below the top layer; and then carrying out carbonization curing to obtain the industrial-grade aerated concrete block. The building blocks are vertically arranged on the partition plate with the through holes at intervals, the contact area of CO2 and the building blocks can be increased, each building block has high carbonization efficiency, uniform carbonization of the building blocks is guaranteed, and therefore the average carbonization efficiency of the industrial-grade aerated concrete building blocks is improved.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to an industrial-grade aerated concrete building block and a preparation method and application thereof. Background Art

[0002] Aerated concrete blocks are a lightweight, porous, thermally insulating, fireproof building material that can be nailed, sawed, planed, and has a certain degree of earthquake resistance. In the industrial production process of aerated concrete blocks, after the cutting is completed, the blanks often need to undergo a high-temperature and high-pressure steaming process. This process requires a lot of energy consumption and also increases the carbon emissions of the blocks. Under the background of "carbon peak and carbon neutrality", the use of carbon dioxide mineralization to maintain aerated concrete blocks can effectively improve the compressive strength of the blocks and replace the steaming process. While effectively reducing energy consumption, it also absorbs a large amount of fixed carbon dioxide, which is an important way to develop a green and low-carbon aerated concrete block.

[0003] However, unlike aerated concrete blocks prepared in the laboratory, the volume of industrial-grade aerated concrete blocks is often dozens or even hundreds of times that of laboratory-grade aerated concrete blocks. In the process of preparing industrial-grade aerated concrete blocks in the prior art, the upper and lower layers of the blocks are fitted together after the blank is cut, which is not conducive to the carbonization of the blocks in the middle. The carbonization efficiency of the industrial-grade aerated concrete blocks in this area is low, resulting in uneven carbonization and low average carbonization efficiency (referring to the average value of the carbonization efficiency of several blocks).

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The first object of the present invention is to provide a method for preparing industrial-grade aerated concrete blocks, by arranging the blocks vertically and at intervals on a partition with through holes, the contact area between CO2 and each block can be increased, so that each block has a high carbonization efficiency, ensuring uniform carbonization of the blocks, thereby improving the average carbonization efficiency of industrial-grade aerated concrete blocks. The problem of incomplete carbonization of the blocks located in the middle after the blank is cut, resulting in uneven carbonization and low average carbonization efficiency in the prior art is solved.

[0006] The second object of the present invention is to provide an industrial-grade aerated concrete block, which has uniform carbonization and high average carbon fixation.

[0007] The third object of the present invention is to provide an industrial-grade aerated concrete block prepared by the method for preparing an industrial-grade aerated concrete block or the application of the industrial-grade aerated concrete block in a construction project.

[0008] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0009] The present invention first provides a method for preparing an industrial-grade aerated concrete block, comprising the following steps: a plurality of blocks obtained after cutting a blank are arranged upright and at intervals on a top layer of a partition, the top layer having a plurality of through holes, and a support column being arranged below the top layer; and then carbonization curing is performed to obtain the industrial-grade aerated concrete block.

[0010] Furthermore, the distance between every two adjacent building blocks is ≥0.5 cm.

[0011] Furthermore, the distance between every two adjacent building blocks is 0.5-3 cm.

[0012] Furthermore, the shape of the building block includes a cuboid, and the length of the building block is 500-800 mm, the width is 100-300 mm, and the height is 100-300 mm.

[0013] Furthermore, a plurality of said building blocks are arranged regularly.

[0014] Furthermore, the number of the through holes is greater than or equal to the number of the building blocks.

[0015] Furthermore, the shape of the through hole includes a circle, and the diameter of the through hole is 3 to 6 cm.

[0016] Furthermore, the distance between every two adjacent through holes is 2-5 cm.

[0017] Furthermore, the through holes are arranged regularly.

[0018] Furthermore, the height of the support column is ≥0.5 cm.

[0019] Furthermore, the height of the support column is 0.5 to 2 cm.

[0020] Furthermore, the number of the support columns is greater than or equal to the number of the building blocks.

[0021] Furthermore, the support columns are regularly arranged.

[0022] Furthermore, the top end of the support column forms a connection point with the top layer, and a plurality of the connection points are distributed between the through holes at intervals.

[0023] Furthermore, the shape of the support column includes a cylinder, and the diameter of the top surface or the bottom surface of the support column is 1 to 3 cm.

[0024] Furthermore, the partition plate also includes a bottom layer away from the building blocks, the bottom layer is arranged parallel to the top layer, and the top layer and the bottom layer are connected by the support column.

[0025] Furthermore, a movable flatbed vehicle is provided below the partition.

[0026] Furthermore, the carbonization curing method comprises: using a gas containing CO2 to first carbonize the blocks at a first pressure, and then increasing the pressure to a second pressure for second carbonization.

[0027] Furthermore, in the CO2-containing gas, the volume fraction of CO2 is ≥20%.

[0028] Furthermore, the first pressure is 0.25-0.35 MPa.

[0029] Furthermore, the first carbonization time is 0.5 to 2 hours.

[0030] Furthermore, the second pressure is 0.45-0.6 MPa.

[0031] Furthermore, the second carbonization time is 1 to 3 hours.

[0032] Furthermore, the carbonization curing temperature of the first carbonization and / or the second carbonization is 25-150°C.

[0033] Furthermore, after the cutting and before the arranging, a pre-curing step is also included; the pre-curing specifically includes: pre-curing the blocks in an environment with a humidity greater than 80% until the strength of the blocks is ≥0.5MPa.

[0034] Furthermore, after the casting is completed, the cutting is performed when the hardness of the blank is 450-600 HV.

[0035] Furthermore, the cutting specifically includes: firstly cutting the blank horizontally with a steel wire having a diameter of 0.5 to 0.8 mm, and then cutting the blank vertically with a steel wire having a diameter of 1.0 to 1.5 mm.

[0036] The present invention further provides an industrial-grade aerated concrete building block, which is mainly prepared by the preparation method of the industrial-grade aerated concrete building block.

[0037] Furthermore, the industrial-grade aerated concrete block includes the following components in parts by mass: 15 to 40 parts of cement, 5 to 25 parts of steel slag, 40 to 60 parts of aggregate tailings, 1 to 10 parts of desulfurized gypsum, 1 to 10 parts of lime, 0.1 to 0.5 parts of water reducer, 0.1 to 0.5 parts of aluminum paste, and 20 to 60 parts of water.

[0038] Furthermore, the average carbon fixation content of the industrial-grade aerated concrete blocks is ≥15%.

[0039] The present invention also provides an industrial-grade aerated concrete block prepared by the method for preparing the industrial-grade aerated concrete block or application of the industrial-grade aerated concrete block in construction engineering.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] (1) The method for preparing industrial-grade aerated concrete blocks provided by the present invention arranges the blocks upright and at intervals on a partition with through holes, which can increase the contact area between CO2 and each block, so that each block has a high carbonization efficiency, ensuring uniform carbonization of the blocks, thereby improving the average carbonization efficiency of the industrial-grade aerated concrete blocks.

[0042] (2) The method for preparing the industrial-grade aerated concrete blocks provided by the present invention can ensure uniform and sufficient carbon fixation of the industrial-grade aerated concrete blocks, thereby improving the quality, especially the strength, of the industrial-grade aerated concrete blocks.

[0043] (3) The method for preparing industrial-grade aerated concrete blocks provided by the present invention can ensure that all blocks can be completely carbonized by further controlling parameters such as the distance between adjacent blocks, the arrangement of blocks, the diameter, number and distribution of through holes, the height, number, size and arrangement of support columns.

[0044] (4) The method for preparing the industrial-grade aerated concrete blocks provided by the present invention can reduce the cracking probability of the industrial-grade aerated concrete blocks.

[0045] (5) The industrial-grade aerated concrete blocks provided by the present invention have high carbon fixation and high strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 A schematic diagram of stacking the cut building blocks provided by the present invention;

[0048] Figure 2 A schematic diagram of the arrangement of the building blocks provided by the present invention;

[0049] Figure 3 A top view of the partition provided by the present invention;

[0050] Figure 4 A front view of the partition provided by the present invention;

[0051] Figure 5 The left side view of the partition provided by the present invention. DETAILED DESCRIPTION

[0052] The technical scheme of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but it will be understood by those skilled in the art that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention. If specific conditions are not specified in the embodiments, they are carried out according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not specified in the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0053] If there is no special explanation, in the present invention, "the first aspect", "the second aspect", "the third aspect", "the fourth aspect", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or quantity, nor can they be understood as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "the first", "the second", "the third", "the fourth", etc. only serve the purpose of non-exhaustive enumeration and description, and it should be understood that they do not constitute a closed limitation on quantity.

[0054] If there is no special explanation, the "include" and "comprising" mentioned in the present invention represent open-ended or closed-ended expressions. For example, the "include" and "comprising" may represent that other components not listed may also be included or only the listed components may be included or only the listed components may be included.

[0055] If there is no special explanation, in the present invention, "one or more" or "at least one" refers to any one, any two or more of the listed items. Among them, "several" refers to any two or more of the listed items.

[0056] In a first aspect, the present invention provides a method for preparing an industrial-grade aerated concrete block, and also a method for carbonization curing of an industrial-grade aerated concrete block, which specifically comprises the following steps:

[0057] The green body formed after casting is cut to obtain a plurality of building blocks. Then the plurality of building blocks obtained after cutting the green body are arranged upright and at intervals on the top layer of the partition. Wherein, a plurality of through holes are provided on the top layer, and a support column is provided below the top layer. That is, each building block is upright or vertically placed on the top layer of the partition with through holes, and there is a certain gap between adjacent building blocks, which are arranged at intervals. Wherein, the number of building blocks includes but is not limited to any one of the point values ​​of 3, 5, 10, 15, 20, 30, 40, 50, 60, 80, 100, 150, 200, 250, 300, 500, 800, 1000 or the range value between any two. The number of through holes includes, but is not limited to, any one of 3, 5, 10, 15, 20, 30, 40, 50, 60, 80, 100, 150, 200, 250, 300, 500, 800, 1000 or any range between them. The number of supporting columns includes, but is not limited to, any one of 3, 5, 10, 15, 20, 30, 40, 50, 60, 80, 100, 150, 200, 250, 300, 500, 800, 1000 or any range between them.

[0058] Then, the blocks are carbonized and cured. After the carbonization and curing is completed, the industrial-grade aerated concrete blocks are obtained.

[0059] The present invention can significantly increase the contact area between the blocks and carbon dioxide by placing each block upright and at intervals, and setting a plurality of through holes on the top layer where the blocks contact the partition, and can ensure that each block achieves a high carbonization efficiency, ensure uniform carbonization of the blocks, thereby improving the average carbonization efficiency of industrial-grade aerated concrete blocks. The problem of incomplete carbonization of the blocks located in the middle after the blank is cut, resulting in uneven carbonization and low average carbonization efficiency in the prior art is solved.

[0060] The average carbonization efficiency refers to the average value of the carbonization efficiencies of a number of (eg, 3, 5, 10, 20 or more) building blocks.

[0061] The method for preparing the industrial-grade aerated concrete building block provided by the present invention can ensure uniform and sufficient carbon fixation of the industrial-grade aerated concrete building block, thereby ensuring the quality of the industrial-grade aerated concrete building block.

[0062] In some specific embodiments, the distance between every two adjacent blocks is ≥0.5 cm, including but not limited to any point value of 0.5 cm, 0.6 cm, 0.8 cm, 1 cm, 1.3 cm, 1.5 cm, 1.8 cm, 2 cm, 2.2 cm, 2.5 cm, 2.7 cm, 3 cm, 4 cm, 5 cm, 6 cm, 8 cm, 10 cm, 15 cm, 20 cm, or any range value between two of them. Controlling the distance between adjacent blocks to be ≥0.5 cm can further improve the carbonization efficiency.

[0063] In some specific implementations, the distance between every two adjacent blocks is 0.5-3 cm, including but not limited to any one of 0.5 cm, 0.6 cm, 0.8 cm, 1 cm, 1.3 cm, 1.5 cm, 1.8 cm, 2 cm, 2.2 cm, 2.5 cm, 2.7 cm, and 3 cm, or any range between two of them. This is beneficial to improving carbonization efficiency and saving space.

[0064] In some specific embodiments, the shape of the building block includes a cuboid, and the length of the building block is 500-800mm, the width is 100-300mm, and the height is 100-300mm. Wherein, the length of the building block includes but is not limited to any point value of 500mm, 530mm, 550mm, 580mm, 600mm, 650mm, 700mm, 750mm, 800mm or any range value between two; the width of the building block includes but is not limited to any point value of 100mm, 150mm, 200mm, 250mm, 300mm or any range value between two; the height of the building block includes but is not limited to any point value of 100mm, 150mm, 200mm, 250mm, 300mm or any range value between two. The building blocks obtained after cutting of the present invention are large-volume industrial-grade building blocks, and the volume of industrial-grade building blocks is often dozens or even hundreds of times that of laboratory-grade building blocks. Therefore, it is difficult to achieve uniform carbonization of industrial-grade building blocks by conventional methods. The method provided by the present invention can achieve uniform carbonization of industrial-grade building blocks with high carbonization efficiency.

[0065] In some specific implementations, a plurality of the building blocks are arranged regularly, that is, regularly, which is conducive to further improving the uniformity of carbonization.

[0066] In some specific implementations, the number of the through holes is greater than or equal to the number of the building blocks, which is beneficial to further improve the carbonization efficiency.

[0067] In some specific embodiments, the shape of the through hole includes a circle, and the diameter of the through hole is 3 to 6 cm, including but not limited to any point value of 3 cm, 4 cm, 5 cm, and 6 cm or a range value between any two of them. Controlling the diameter of the through hole within this range is conducive to further improving the carbonization efficiency.

[0068] In another embodiment, the shape of the through hole may also be set to be an ellipse, a triangle or an irregular shape, etc., and may be set as needed.

[0069] In some specific embodiments, the distance between each two adjacent through holes is 2-5 cm, including but not limited to any point value of 2 cm, 3 cm, 4 cm, 5 cm or any range value between the two. By controlling the distance between adjacent through holes, the carbonization efficiency can be further improved.

[0070] In some specific implementations, the through holes are arranged regularly, which is beneficial to further promote uniform carbonization.

[0071] In some specific implementations, a plurality of through holes may be provided under each block, or a through hole may be provided directly under each block. In this way, almost all of the six faces of the block can be in direct contact with CO2, which is conducive to promoting uniform and complete carbonization of industrial-grade aerated concrete blocks.

[0072] In some specific embodiments, the height of the support column is ≥ 0.5 cm, including but not limited to any point value of 0.5 cm, 0.6 cm, 0.8 cm, 1 cm, 1.3 cm, 1.5 cm, 1.8 cm, 2 cm, 3 cm, 5 cm, 8 cm, 10 cm, 15 cm, 20 cm, or any range value between two of them. A support column with a certain height is conducive to the entry of carbon dioxide to ensure that the block is fully carbonized.

[0073] In some specific embodiments, the height of the support column is 0.5-2 cm, including but not limited to any point value of 0.5 cm, 0.6 cm, 0.8 cm, 1 cm, 1.3 cm, 1.5 cm, 1.8 cm, 2 cm, or any range value between two of them. This is beneficial to improve the average carbonization efficiency and save space.

[0074] In some specific implementations, the number of the support columns is ≥ the number of the building blocks; this is beneficial to improving the stability of the partition.

[0075] In some specific implementations, the support pillars are regularly arranged to accommodate the positions of the through holes.

[0076] In some specific embodiments, the top of the support column forms a connection point with the top layer, and a plurality of the connection points are spaced and distributed between the through holes, that is, the connection points are located around the through holes, for example, they can be set at the center of four adjacent through holes, so as to provide sufficient support force to support the top layer of the partition.

[0077] In some specific embodiments, the shape of the support column includes a cylinder, and the diameter of the top surface or the bottom surface of the support column is 1 to 3 cm, including but not limited to any point value of 1 cm, 2 cm, 3 cm or any range value between the two. This is conducive to providing better support.

[0078] In another embodiment, the support column may also be in the shape of a cuboid, a truncated cone, etc., which can be set as needed.

[0079] The present invention can ensure that all building blocks can be completely carbonized by further controlling parameters such as the distance between adjacent building blocks, the arrangement of building blocks, the diameter, number and distribution of through holes, the height, number, size and arrangement of support columns.

[0080] The present invention realizes uniform carbonization of blocks and completely carbonizes each block, thereby increasing the carbon fixation amount of each large-volume industrial-grade aerated concrete block, thereby improving the quality, especially the strength, of the large-volume industrial-grade aerated concrete block.

[0081] The preparation method of industrial-grade aerated concrete blocks, or the carbonization curing method of industrial-grade aerated concrete blocks provided by the present invention, explores a new path for the green and low-carbon development of aerated concrete blocks and the "carbon neutrality" of the building materials industry.

[0082] In some specific embodiments, the material of the top layer of the separator includes steel.

[0083] In some specific implementations, the material of the support column includes steel.

[0084] In some specific implementations, the partition further comprises a bottom layer away from the building blocks, the bottom layer is arranged parallel to the top layer, and the top layer and the bottom layer are connected via the support column, which is conducive to further improving the stability of the partition.

[0085] In some specific implementations, the bottom layer of the separator is a solid steel plate.

[0086] In some specific implementations, a movable flatbed truck is further provided below the partition for moving the partition and the building blocks.

[0087] In some specific implementations, the arrangement is performed using a board breaking machine and a block clamping machine. Specifically, after horizontal and vertical cutting, the board breaking machine is first used to clamp the building blocks of the top layer (i.e., the first layer from top to bottom), and the building blocks are placed on a turning table. After the building blocks are turned 90 degrees, a block clamping machine is used to place the building blocks on the partition on a flatbed trolley (i.e., a movable flatbed trolley). Then, a board breaking machine is used to clamp the building blocks of the second layer and place them on the turning table. After the building blocks are turned 90 degrees, a block clamping machine is used to place the building blocks on the partition on the flatbed trolley, and so on, until all layers of building blocks are turned 90 degrees and placed on the partition on the flatbed trolley. After each layer of building blocks is turned over, it is placed in parallel and at intervals on the partition. The schematic diagram of the stacking of building blocks before arrangement and the schematic diagram of the placement of building blocks after arrangement are respectively shown as follows: Figure 1 and Figure 2 As shown. Figure 2 As shown, the blocks are arranged vertically and spaced apart.

[0088] In some specific embodiments, when there is a bottom layer, the structure diagram of the partition is as follows Figure 3 , Figure 4 and Figure 5 As shown, Figure 3 is a top view, Figure 4 For the main view, Figure 5 It is the left view. Figure 3 It can be seen that the through holes are evenly distributed, the support columns are evenly distributed, the tops of the support columns form several connection points with the top layer, and the several connection points are distributed between the through holes at intervals. Figure 4 and Figure 5 It can be seen that the support column is located between the top layer and the bottom layer, and is used to support or connect the top layer and the bottom layer of the partition.

[0089] In some specific embodiments, the carbonization curing method includes: using a gas containing CO2 to first carbonize the blocks at a first pressure, and then increasing the pressure to a second pressure for second carbonization. Carbonization curing is an exothermic process. The present invention can prevent the carbonization reaction from being too intense and releasing heat too quickly, which may lead to cracking of the blocks, by first carbonizing at a first pressure and then carbonizing at a higher pressure. That is, this method can reduce the probability of cracking of industrial-grade aerated concrete blocks.

[0090] In some specific embodiments, the volume fraction of CO2 in the CO2-containing gas is ≥ 20%, including but not limited to any point value of 20%, 30%, 50%, 80%, 100%, or any range value between the two. This is conducive to improving carbonization efficiency and promoting complete carbonization.

[0091] In some specific embodiments, the first pressure is 0.25-0.35 MPa, including but not limited to any point value of 0.25 MPa, 0.26 MPa, 0.28 MPa, 0.3 MPa, 0.33 MPa, 0.35 MPa or any range value between two of them. The first carbonization at low pressure can reduce the cracking probability of industrial-grade aerated concrete blocks.

[0092] In some specific embodiments, the first carbonization time is 0.5 to 2 hours, including but not limited to any one of 0.5 hours, 1 hour, 1.5 hours, and 2 hours, or a range of any two thereof. By controlling the first carbonization time, the cracking probability of industrial-grade aerated concrete blocks can be further reduced.

[0093] In some specific embodiments, the second pressure is 0.45-0.6 MPa, including but not limited to any one of 0.45 MPa, 0.5 MPa, 0.55 MPa, and 0.6 MPa, or a range between any two of them. This pressure is beneficial to improving carbonization efficiency.

[0094] The present invention can achieve complete carbonization of industrial-grade large-volume aerated concrete blocks without using excessively high pressure.

[0095] In some specific embodiments, the second carbonization time is 1 to 3 hours, including but not limited to any one of 1 hour, 2 hours, and 3 hours, or any range between the two, which is conducive to promoting complete carbonization.

[0096] In some specific embodiments, the carbonization curing temperature of the first carbonization and / or the second carbonization is 25-150°C, including but not limited to any one of 25°C, 30°C, 40°C, 50°C, 60°C, 80°C, 100°C, 120°C, 150°C or a range between any two of them.

[0097] In some specific embodiments, after the cutting and before the arrangement, a pre-curing step is also included. The pre-curing step specifically includes: pre-curing the blocks in an environment with a humidity greater than 80% (including but not limited to any point value of 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90% or any range value between the two), until the strength of the blocks is ≥ 0.5MPa (including but not limited to any point value of 0.5MPa, 0.52MPa, 0.53MPa, 0.55MPa, 0.58MPa, 0.6MPa or any range value between the two). The present invention pre-cures the blocks before arranging the blocks, which can improve the strength of the blocks and provide an initial strength to the blocks. On the one hand, it can prevent the subsequent carbonization process from cracking due to the increase in the temperature of the exothermic blocks. On the other hand, when arranging the blocks (for example, using a board breaking machine to clamp the blocks), the blocks need to have a certain strength, otherwise the blocks are easily crushed.

[0098] In some specific embodiments, after pouring is completed, the cutting is performed when the hardness of the blank is 450-600 HV (including but not limited to any point value of 450 HV, 500 HV, 550 HV, 600 HV or a range value between any two); this can prevent the blocks from cracking.

[0099] In some specific embodiments, the cutting specifically includes: firstly using a steel wire with a diameter of 0.5-0.8 mm (including but not limited to any point value of 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm or any range value between the two) to horizontally cut the blank, and then using a steel wire with a diameter of 1.0-1.5 mm (including but not limited to any point value of 1 mm, 1.1 mm, 1.3 mm, 1.5 mm or any range value between the two) to vertically cut the blank. This is conducive to preventing the block from cracking. If the diameter of the steel wire is too large, it is easy to cause cracks in the blank during the cutting process.

[0100] In a second aspect, the present invention provides an industrial-grade aerated concrete block, which is prepared by the above-mentioned method for preparing the industrial-grade aerated concrete block.

[0101] The industrial-grade aerated concrete building block provided by the invention has high carbon fixation amount and good carbonization uniformity, and the industrial-grade aerated concrete building block has high strength.

[0102] In some specific embodiments, the industrial-grade aerated concrete block includes the following components in parts by mass: 15 to 40 parts of cement, 5 to 25 parts of steel slag, 40 to 60 parts of aggregate tailings, 1 to 10 parts of desulfurized gypsum, 1 to 10 parts of lime, 0.1 to 0.5 parts of water reducer, 0.1 to 0.5 parts of aluminum paste, and 20 to 60 parts of water. Among them, cement, by mass, includes but is not limited to any one of 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts or any range between two parts; steel slag, by mass, includes but is not limited to any one of 5 parts, 10 parts, 15 parts, 20 parts, 25 parts or any range between two parts; aggregate tailings, by mass, includes but is not limited to any one of 40 parts, 45 parts, 50 parts, 55 parts, 60 parts or any range between two parts; desulfurized gypsum, by mass, includes but is not limited to any one of 1 part, 2 parts, 3 parts, 5 parts, 6 parts, 8 parts, 10 parts or any range between two parts; lime, by mass, includes but is not limited to any one of 1 part, 2 parts, 3 parts, 5 parts, 6 parts, 8 parts, 10 parts or any range between two parts; The quantity in parts includes but is not limited to any one of 1 part, 2 parts, 3 parts, 5 parts, 6 parts, 8 parts, and 10 parts, or a range of values ​​between any two of them; the mass proportion of water reducer includes but is not limited to any one of 0.1 part, 0.2 part, 0.3 part, 0.4 part, and 0.5 parts, or a range of values ​​between any two of them; the mass proportion of aluminum paste includes but is not limited to any one of 0.1 part, 0.2 part, 0.3 part, 0.4 part, and 0.5 parts, or a range of values ​​between any two of them; the mass proportion of water includes but is not limited to any one of 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 50 parts, and 60 parts, or a range of values ​​between any two of them.

[0103] The present invention can achieve the effect of promoting the carbonization degree and increasing the carbon fixation amount without adding additional carbonization accelerators or other additives. The industrial-grade aerated concrete block has low production cost and simpler formula.

[0104] In some specific embodiments, the average carbon fixation of the industrial-grade aerated concrete block is ≥ 15%, including but not limited to any point value of 15%, 16%, 17%, 18%, 19%, 20%, or any range value between two of them. The average carbon fixation refers to the average value of the carbon fixation measured by several (e.g., 3, 5, 10, 20, 50 or more) industrial-grade aerated concrete block products.

[0105] The industrial-grade aerated concrete building block provided by the invention has a high average carbon fixation amount, thereby improving the strength of the industrial-grade aerated concrete building block.

[0106] In a third aspect, the present invention provides an industrial-grade aerated concrete block prepared by the method for preparing the industrial-grade aerated concrete block, or the use of the industrial-grade aerated concrete block in a construction project.

[0107] The industrial-grade aerated concrete blocks provided by the present invention can be widely used in the field of construction engineering, for example, in multiple locations such as building walls, partition walls, and floor slabs, and the present invention does not limit this.

[0108] The embodiments of the present invention will be described in detail below in conjunction with the examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present invention and should not be considered as limiting the scope of the present invention. If no specific conditions are specified in the examples, the conditions are carried out according to normal conditions or the conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be obtained commercially.

[0109] Example 1

[0110] The method for preparing the industrial-grade aerated concrete blocks provided in this embodiment comprises the following steps:

[0111] (1) By weight, 25 parts of P·Ⅱ52.5 cement and 15 parts of cement with a specific surface area of ​​385 kg / m 2 Steel slag, 50 parts of aggregate tailings with a residue of 5% on a 80μm square hole sieve (i.e., 5% of the aggregate tailings have a particle size greater than 80μm), 5 parts of desulfurized gypsum stone, and 5 parts of lime are placed in a mixer and stirred evenly. Then, 33 parts of water are added thereto, and the water-to-material ratio (the mass ratio of water to solid material) is controlled to be 0.33. 0.2 parts of a water reducer is added thereto to adjust the fluidity of the slurry to 350mm. After adding water and stirring for 2 minutes, 0.15 parts of aluminum powder paste is added, and after stirring for 1 minute, the slurry is poured into an industrial mold box.

[0112] (2) After pouring, when the hardness of the blank reaches 550 HV, the blank is first cut horizontally with a steel wire with a diameter of 0.6 mm, and then cut vertically with a steel wire with a diameter of 1.2 mm. After cutting, a number of aerated concrete blocks are obtained, which are rectangular in shape, with a length of 600 mm, a width of 200 mm, and a height of 200 mm.

[0113] (3) Pre-curing the blocks obtained after cutting in an environment with a humidity of 85% until the strength of the blocks reaches 0.5 MPa.

[0114] (4) After the pre-curing is completed, use a board breaking machine to clamp the top layer of blocks (i.e., the first layer from top to bottom). The clamp of the board breaking machine is perpendicular to the long side of the blocks and placed on a turning table. After the blocks are turned 90 degrees, a block clamp is used to place the blocks on the top layer of the partition on the movable flatbed truck. Then, use a board breaking machine to clamp the blocks of the second layer and place them on the turning table. After the blocks are turned 90 degrees, a block clamp is used to place the blocks on the top layer of the partition on the movable flatbed truck. This is repeated until all layers of blocks are turned 90 degrees and placed on the partition on the movable flatbed truck. After each layer of blocks is turned over, they are arranged regularly on the partition. Several blocks are arranged upright and spaced apart on the top layer of the partition. The distance between two adjacent blocks is 2 cm. The top layer of the partition is a steel plate with multiple through holes, and the bottom layer of the partition is a horizontal solid steel plate. The bottom layer is arranged parallel to the top layer. The through holes are circular in shape, with a diameter of 5 cm. The through holes are regularly and evenly distributed on the top layer. The distance between two adjacent through holes is 4 cm, and the number of through holes is equal to the number of blocks. The top layer and the bottom layer of the partition are connected by multiple support columns. The support columns are solid cylindrical steel, that is, the shape of the support columns is a cylinder, the diameter of the top and bottom surfaces of the support columns is 2 cm, and the height of the support columns is 1 cm (that is, the distance between the top layer and the bottom layer is 1 cm). The support columns are regularly arranged, and a connection point is formed between the top of the support column and the top layer. Several connection points are spaced and evenly distributed between the through holes. The number of support columns is greater than the number of blocks.

[0115] (5) The blocks that have been turned over and hoisted and arranged are sent to a carbonization kettle for carbonization curing: at room temperature (25°C), a CO2-containing gas (a mixture of CO2 and air) with a CO2 volume fraction of 50% is used to carbonize the blocks at 0.3 MPa for 1 hour, and then the pressure is increased to 0.5 MPa for carbonization for 2 hours to obtain industrial-grade aerated concrete blocks.

[0116] Example 2

[0117] The preparation method of the industrial-grade aerated concrete blocks provided in this embodiment is basically the same as that in embodiment 1, except that step (4) is as follows: after the pre-curing is completed, the top layer of blocks is clamped by a board breaking machine, the clamp of the board breaking machine is perpendicular to the long side of the blocks, and is placed on a turning table. After the blocks are turned 90 degrees, the blocks are placed on the top layer of the partition on the movable flatbed truck by a block clamping machine. Then, the second layer of blocks is clamped by a board breaking machine and placed on the turning table. After the blocks are turned 90 degrees, the blocks are placed on the top layer of the partition on the movable flatbed truck by a block clamping machine, and so on, until all layers of blocks are turned 90 degrees and placed on the partition on the movable flatbed truck. After each layer of blocks is turned over, they are arranged regularly on the partition, and several blocks are arranged upright and spaced apart on the top layer of the partition, and the distance between two adjacent blocks is 0.5 cm. The top layer of the partition is a steel plate with multiple through holes, and the bottom layer of the partition is a horizontal solid steel plate. The bottom layer is arranged parallel to the top layer. The through holes are circular in shape, with a diameter of 6 cm. The through holes are regularly and evenly distributed on the top layer. The distance between two adjacent through holes is 2 cm, and the number of through holes is equal to the number of blocks. The top layer and the bottom layer of the partition are connected by multiple support columns. The support columns are solid cylindrical steel, that is, the support columns are cylindrical in shape, with a diameter of 3 cm on the top and bottom surfaces of the support columns, and a height of 2 cm. The support columns are regularly arranged, and a connection point is formed between the top of the support column and the top layer. Several connection points are spaced and evenly distributed between the through holes, and the number of support columns is equal to the number of blocks.

[0118] Example 3

[0119] The preparation method of the industrial-grade aerated concrete blocks provided in this embodiment is basically the same as that in embodiment 1, except that step (4) is as follows: after the pre-curing is completed, the top layer of blocks is clamped by a board breaking machine, the clamp of the board breaking machine is perpendicular to the long side of the blocks, and is placed on a turning table. After the blocks are turned 90 degrees, the blocks are placed on the top layer of the partition on the movable flatbed truck by a block clamping machine. Then, the second layer of blocks is clamped by a board breaking machine and placed on the turning table. After the blocks are turned 90 degrees, the blocks are placed on the top layer of the partition on the movable flatbed truck by a block clamping machine, and so on, until all layers of blocks are turned 90 degrees and placed on the partition on the movable flatbed truck. After each layer of blocks is turned over, they are arranged regularly on the partition, and several blocks are arranged upright and spaced apart on the top layer of the partition, and the distance between two adjacent blocks is 3 cm. The top layer of the partition is a steel plate with multiple through holes, and the bottom layer of the partition is a horizontal solid steel plate. The bottom layer is arranged parallel to the top layer. The through holes are circular in shape, with a diameter of 3 cm. The through holes are regularly and evenly distributed on the top layer. The distance between two adjacent through holes is 5 cm, and the number of through holes is greater than the number of blocks. The top layer and the bottom layer of the partition are connected by multiple support columns. The support columns are solid cylindrical steel, that is, the support columns are cylindrical in shape, with a diameter of 1 cm on the top and bottom surfaces of the support columns, and a height of 0.5 cm. The support columns are regularly arranged, and a connection point is formed between the top of the support column and the top layer. Several connection points are spaced and evenly distributed between the through holes, and the number of support columns is greater than the number of blocks.

[0120] Example 4

[0121] The preparation method of the industrial-grade aerated concrete blocks provided in this embodiment is basically the same as that in Embodiment 1, except that step (5) is as follows: the blocks that have been turned over, hoisted and arranged are sent to a carbonization kettle for carbonization curing: at 50° C., a CO2-containing gas (a mixture of CO2 and air) with a volume fraction of CO2 of 30% is used to carbonize the blocks at 0.25 MPa for 2 h, and then the pressure is increased to 0.6 MPa for carbonization for 1 h to obtain industrial-grade aerated concrete blocks.

[0122] Example 5

[0123] The method for preparing the industrial-grade aerated concrete blocks provided in this embodiment is basically the same as that in Embodiment 1, except that step (3) is: pre-curing the blocks obtained after cutting in an environment with a humidity of 90% until the strength of the blocks reaches 0.8 MPa.

[0124] Example 6

[0125] The preparation method of the industrial-grade aerated concrete blocks provided in this embodiment is basically the same as that in Embodiment 1, except that, in step (2), after the pouring is completed, when the hardness of the blank reaches 450 HV, the blank is firstly cut horizontally with a steel wire with a diameter of 0.7 mm, and then the blank is cut vertically with a steel wire with a diameter of 1.0 mm.

[0126] Example 7

[0127] The preparation method of the industrial-grade aerated concrete blocks provided in this embodiment is basically the same as that in Embodiment 1, except that in step (2), after cutting, the length of the blocks is 600 mm, the width is 300 mm, and the height is 100 mm.

[0128] Example 8

[0129] The preparation method of the industrial-grade aerated concrete block provided in this embodiment is basically the same as that in embodiment 1, except that step (1) is as follows: 35 parts by weight of P·Ⅱ52.5 cement and 20 parts by weight of aerated concrete block having a specific surface area of ​​385 kg / m 2 Steel slag, 40 parts of aggregate tailings with a 80μm square hole sieve residue of 5%, 3 parts of desulfurized gypsum stone, and 8 parts of lime are placed in a mixer and stirred evenly. Then, 45 parts of water are added thereto, and 0.3 parts of a water reducer are added thereto to adjust the fluidity of the slurry to 360mm. After adding water and stirring for 2 minutes, 0.2 parts of aluminum powder paste are added, and after stirring for 1 minute, the slurry is poured into an industrial mold box.

[0130] Comparative Example 1

[0131] The method for preparing the industrial-grade aerated concrete blocks provided in this comparative example is basically the same as that in Example 1, except that step (4) is not performed, and instead the blocks obtained after pre-curing in step (3) are directly sent to a carbonization kettle for carbonization curing, wherein the parameters of the carbonization curing are the same as those in Example 1.

[0132] Comparative Example 2

[0133] The method for preparing the industrial-grade aerated concrete blocks provided in this comparative example is basically the same as that in Example 1, except that step (3) is not performed, and instead the blocks cut in step (2) are directly flipped, hoisted and arranged.

[0134] In this comparative example, due to the lack of pre-curing, some blocks were crushed when the block was clamped by the board breaking machine, and some blocks cracked after carbonization, which greatly reduced the qualified rate of the product. Compared with Example 1, the qualified rate of Comparative Example 2 was reduced by 60%.

[0135] Comparative Example 3

[0136] The preparation method of the industrial-grade aerated concrete blocks provided in this comparative example is basically the same as that of Example 1, except that step (5) is: sending the overturned, hoisted and arranged blocks to a carbonization kettle for carbonization curing: at room temperature (25°C), using a CO2-containing gas (a mixture of CO2 and air) with a volume fraction of CO2 of 50%, each block is carbonized at 0.5 MPa for 3 hours to obtain an industrial-grade aerated concrete block.

[0137] In this comparative example, low-pressure carbonization (first carbonization) was not performed first. Due to the excessively violent carbonization reaction and the rapid heat release, some blocks cracked, reducing the qualified rate of the product. Compared with Example 1, the qualified rate of Comparative Example 3 was reduced by 30%.

[0138] Comparative Example 4

[0139] The preparation method of the industrial-grade aerated concrete blocks provided in this comparative example is basically the same as that in Example 1, except that step (4) is as follows: after the pre-curing is completed, the top layer of blocks is clamped by a board breaking machine, the clamp of the board breaking machine is perpendicular to the long side of the blocks, and is placed on a turning table. After the blocks are turned 90 degrees, the blocks are placed on the top layer of the partition on the movable flatbed truck by a block clamping machine. Then, the second layer of blocks is clamped by a board breaking machine and placed on the turning table. After the blocks are turned 90 degrees, the blocks are placed on the top layer of the partition on the movable flatbed truck by a block clamping machine, and so on, until all layers of blocks are turned 90 degrees and placed on the partition on the movable flatbed truck. After each layer of blocks is turned over, they are arranged regularly on the partition, and several blocks are arranged upright and spaced apart on the top layer of the partition, and the distance between two adjacent blocks is 0.2 cm. The top layer of the partition is a steel plate with multiple through holes, and the bottom layer of the partition is a horizontal solid steel plate. The bottom layer is arranged parallel to the top layer. The through holes are circular in shape, with a diameter of 1 cm. The through holes are regularly and evenly distributed on the top layer. The distance between two adjacent through holes is 10 cm, and the number of through holes is less than the number of blocks. The top layer and the bottom layer of the partition are connected by multiple support columns. The support columns are solid cylindrical steel, that is, the shape of the support columns is a cylinder, the diameter of the top and bottom surfaces of the support columns is 2 cm, the height of the support columns is 0.1 cm, and the support columns are regularly arranged. A connection point is formed between the top of the support column and the top layer. Several connection points are spaced and evenly distributed between the through holes. The number of support columns is greater than the number of blocks.

[0140] Experimental example

[0141] Take 30 industrial-grade aerated concrete blocks prepared in Example 1 for carbon fixation test, where the sampling positions of the industrial-grade aerated concrete blocks include the two ends and the middle of the placement position, and take 10 each. The method of carbon fixation test is as follows: the industrial-grade aerated concrete blocks are dried in an oven at 55°C to constant weight, ground with a vibration mill, calcined in an electric furnace at 600°C to constant weight, and then calcined in an electric furnace at 900°C to constant weight, and the mass difference before and after is taken to calculate the carbon fixation of the aerated concrete. Then, the average value of the carbon fixation of the 30 groups is taken as the average carbon fixation, and the absolute value of the difference between the maximum and minimum values ​​in the 30 groups is calculated as the carbon fixation deviation. The results are shown in Table 1. Using the same method, the average carbon fixation and carbon fixation deviation of other embodiments and comparative examples are tested and calculated, and the results are shown in Table 1.

[0142] Table 1 Average carbon fixation and carbon fixation deviation of industrial aerated concrete blocks

[0143]

[0144]

[0145] It can be seen from Table 1 that the industrial-grade aerated concrete blocks prepared by the methods of the embodiments have a higher average carbon fixation amount and a smaller carbon fixation amount deviation. This shows that the present invention provides a method for preparing an industrial-grade aerated concrete block, so that each block has a high carbonization efficiency, ensuring uniform carbonization of the block, thereby improving the average carbonization efficiency of the industrial-grade aerated concrete block.

[0146] Specifically, by comparing Example 1 and Comparative Example 1, it can be seen that, compared with Comparative Example 1 which is not subjected to the overturning, hoisting and placement arrangement, the average carbon fixation amount of Example 1 after the overturning, hoisting and placement arrangement is performed is increased by more than 80%.

[0147] Although the average carbon fixation amount and the carbon fixation amount deviation of Comparative Examples 2 and 3 did not change significantly, the yield rate decreased significantly.

[0148] Comparative Example 4 has an inappropriate arrangement, such as a small distance between adjacent blocks, a small through hole diameter, and a small distance between the top and bottom layers of the partition, resulting in a decrease in the average carbon fixation amount compared to Example 1. At the same time, by comparing Example 1, Example 3 and Example 4, it can be seen that the average carbon fixation amount will also change by adjusting the arrangement, such as the distance between adjacent blocks, the through hole diameter, the distance between the top and bottom layers of the partition, etc. This shows that the present invention is conducive to further promoting the average carbonization efficiency by controlling the arrangement and its parameters, so that all blocks are carbonized and carbonized completely.

[0149] Although the present invention has been illustrated and described with specific embodiments, it should be appreciated that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Those skilled in the art should understand that the technical solutions described in the above embodiments may be modified, or some or all of the technical features thereof may be replaced by equivalents without departing from the spirit and scope of the present invention. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. Therefore, this means that all such replacements and modifications within the scope of the present invention are included in the appended claims.

Claims

1. A method for preparing an industrial-grade aerated concrete block, characterized in that: The steps include: A plurality of blocks obtained after cutting the blank are arranged vertically and at intervals on the top layer of the partition, the top layer has a plurality of through holes, and a support column is arranged below the top layer; then carbonization curing is performed to obtain the industrial-grade aerated concrete blocks.

2. The method for preparing the industrial-grade aerated concrete block according to claim 1, characterized in that: At least one of the following conditions is met: (1) The distance between every two adjacent building blocks is ≥ 0.5 cm; (2) The distance between each two adjacent blocks is 0.5 to 3 cm; (3) The shape of the building block includes a rectangular parallelepiped, the length of the building block is 500-800 mm, the width is 100-300 mm, and the height is 100-300 mm; (4) a plurality of said building blocks are arranged regularly; (5) The number of the through holes is ≥ the number of the building blocks; (6) The shape of the through hole includes a circle, and the diameter of the through hole is 3 to 6 cm; (7) The distance between each two adjacent through holes is 2 to 5 cm; (8) The through holes are arranged regularly.

3. The method for preparing the industrial-grade aerated concrete block according to claim 1, characterized in that: At least one of the following conditions is met: (1) The height of the support column is ≥ 0.5 cm; (2) The height of the support column is 0.5 to 2 cm; (3) The number of the support columns is greater than or equal to the number of the building blocks; (4) The support columns are arranged regularly; (5) The top of the support column forms a connection point with the top layer, and a plurality of the connection points are spaced and distributed between the through holes; (6) The shape of the support column includes a cylinder, and the diameter of the top surface or the bottom surface of the support column is 1 to 3 cm; (7) The partition further comprises a bottom layer away from the building blocks, the bottom layer is arranged parallel to the top layer, and the top layer and the bottom layer are connected by the support column; (8) A movable flatbed truck is also provided below the partition.

4. The method for preparing the industrial-grade aerated concrete block according to claim 1, characterized in that: The carbonization curing method comprises: using a gas containing CO2 to firstly carbonize the blocks at a first pressure, and then increasing the pressure to a second pressure to perform a second carbonization.

5. The method for preparing the industrial-grade aerated concrete block according to claim 4, characterized in that: At least one of the following conditions is met: (1) The volume fraction of CO2 in the CO2-containing gas is ≥ 20%; (2) The first pressure is 0.25 to 0.35 MPa; (3) The first carbonization time is 0.5 to 2 hours; (4) The second pressure is 0.45-0.6 MPa; (5) The second carbonization time is 1 to 3 hours; (6) The carbonization curing temperature of the first carbonization and / or the second carbonization is 25 to 150°C.

6. The method for preparing the industrial-grade aerated concrete block according to claim 1, characterized in that: After the cutting and before the arranging, a pre-curing step is also included; the pre-curing specifically includes: pre-curing the blocks in an environment with a humidity greater than 80% until the strength of the blocks is ≥0.5MPa.

7. The method for preparing the industrial-grade aerated concrete block according to claim 1, characterized in that: After the pouring is completed, the cutting is performed when the hardness of the blank is 450-600 HV; And / or, the cutting specifically includes: firstly cutting the blank horizontally with a steel wire having a diameter of 0.5-0.8 mm, and then cutting the blank vertically with a steel wire having a diameter of 1.0-1.5 mm.

8. An industrial-grade aerated concrete block, characterized in that: The aerated concrete block is mainly prepared by the preparation method of the industrial-grade aerated concrete block according to any one of claims 1 to 7.

9. The industrial-grade aerated concrete block according to claim 8, characterized in that: The industrial-grade aerated concrete block comprises the following components by weight: 15-40 parts of cement, 5-25 parts of steel slag, 40-60 parts of aggregate tailings, 1-10 parts of desulfurized gypsum, 1-10 parts of lime, 0.1-0.5 parts of water reducer, 0.1-0.5 parts of aluminum powder paste, and 20-60 parts of water; And / or, the average carbon fixation content of the industrial-grade aerated concrete blocks is ≥15%.

10. Use of the industrial-grade aerated concrete block prepared by the method for preparing the industrial-grade aerated concrete block according to any one of claims 1 to 7, or the industrial-grade aerated concrete block according to any one of claims 8 to 9 in construction projects.

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