Maintenance method of aerated concrete plate

Abstract

The invention relates to the technical field of building materials, in particular to a curing method of an aerated concrete plate. A curing method for aerated concrete plates comprises the following steps that a plurality of aerated concrete plates are arranged in a stacked mode, an isolation device is arranged between any adjacent layers of aerated concrete plates, and a stacked body is obtained; performing N-stage carbonization treatment, Ngt, on the laminated body; 2, in the carbonization process from the first stage to the Nth stage, the CO2 concentration in the carbonization gas is in an increasing trend, the carbonization treatment pressure is in an increasing trend, and the carbonization treatment time is in an increasing trend; the CO2 concentration of the first-stage carbonization treatment is 20%-30%, the pressure of the first-stage carbonization treatment is 0.01-0.05 MPa, and the carbonization time of the first-stage carbonization treatment is 10-15 min. According to the method, the plate can be uniformly and completely carbonized on the premise of ensuring the apparent performance and the mechanical performance of the industrial grade aerated concrete, and the carbon sequestration amount of the plate can be effectively increased.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to a curing method for an aerated concrete plate. Background Art

[0002] Aerated concrete board is a porous board made of siliceous and calcareous materials as the main raw materials, aluminum powder as the gas-generating material, and anti-corrosion treated steel mesh. It is made by adding water, mixing, casting, pre-curing, cutting, and autoclaving. It has the characteristics of light weight, heat preservation, and fire resistance. In the preparation process of traditional aerated concrete boards, high temperature and high pressure curing is required to improve the strength of the board, and the high temperature and high pressure curing process requires a lot of energy consumption. At present, the use of carbon dioxide curing can not only replace autoclave curing and improve the strength of aerated concrete boards, but also fix a large amount of carbon dioxide, which is an important way to develop aerated concrete green and low-carbon. However, industrial aerated concrete boards are often large in size, and after the cutting of the blank is completed, the upper and lower layers of the board are tightly attached. During the carbonization process, carbonization cannot be achieved inside, which affects the quality and carbon fixation of aerated concrete boards.

[0003] The existing technology is mainly designed for the formula of aerated concrete to improve the performance and carbon fixation of aerated concrete. In the carbonization process, it is mainly aimed at the carbonization of small-volume aerated concrete blocks, which is not suitable for industrial-grade aerated concrete. In addition, the usual method for increasing the carbonization depth of aerated concrete is to increase the carbonization pressure, which has a certain effect on small-volume aerated concrete blocks, but for industrial-grade large-volume aerated concrete panels, increasing the carbonization pressure cannot achieve complete carbonization of the panels.

[0004] Therefore, it is crucial to obtain a carbonization curing method suitable for industrial-grade aerated concrete panels to obtain high-quality, high-carbon-fixing aerated concrete panels.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] One object of the present invention is to provide a method for curing an aerated concrete board, so as to solve the problem that the methods in the prior art cannot simultaneously obtain industrial-grade aerated concrete boards with high quality and high carbon fixation.

[0007] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0008] A method for curing an aerated concrete plate comprises the following steps:

[0009] A plurality of aerated concrete panels are stacked and arranged, and an isolation device is provided between the aerated concrete panels of any adjacent layers to obtain a stacked body; the stacked body is subjected to N-level carbonization treatment, N>2, and in the carbonization process from the first level to the Nth level, the CO2 concentration in the carbonization gas is increasing, the pressure of the carbonization treatment is increasing, and the time of the carbonization treatment is increasing; the CO2 concentration of the first level carbonization treatment is 20% to 30%, the pressure is 0.01 to 0.05 MPa, and the carbonization time is 10 to 15 minutes.

[0010] In some embodiments, the isolation device includes a plurality of partitions, wherein the partitions of each layer are spaced apart along the length direction of the aerated concrete board, and the length direction of the partitions is perpendicular to the length direction of the aerated concrete board; the partitions have a first surface and a second surface relative to each other, and along the length direction of the partitions, the first surface has a plurality of spaced apart first recessed structures, and a first boss is formed between any adjacent first recessed structures, and the second surface has a plurality of spaced apart second recessed structures, and a second boss is formed between any adjacent second recessed structures, and an extension direction of the first recessed structure and an extension direction of the second recessed structure are respectively perpendicular to the length direction of the partition.

[0011] In some embodiments, the first recessed structure and the second recessed structure each independently present a semicircular curved surface.

[0012] In some embodiments, the spacing between adjacent first bosses and the spacing between adjacent second bosses are each independently 5 to 10 cm, the width of the first boss and the second boss are each 3 to 10 cm, the height of the partition is 5.5 to 13 cm, the width of the partition is 3 to 10 cm, and the length of the partition is the same as the width of the aerated concrete board.

[0013] In some embodiments, the distance between any adjacent partitions in each layer is 30-50 cm.

[0014] In some embodiments, N is 3-6.

[0015] In some embodiments, the CO2 concentration of the Nth stage carbonization treatment is 90% to 100%, the pressure of the Nth stage carbonization treatment is 0.7 to 1 MPa, and the carbonization time of the Nth stage carbonization treatment is 30 to 60 min.

[0016] In some embodiments, the N is 4, wherein the CO2 concentration of the second stage carbonization treatment is 45% to 55%, the pressure of the second stage carbonization treatment is 0.1 to 0.2 MPa, and the carbonization time of the second stage carbonization treatment is 15 to 20 min; the CO2 concentration of the third stage carbonization treatment is 70% to 80%, the pressure of the third stage carbonization treatment is 0.3 to 0.5 MPa, and the carbonization time of the third stage carbonization treatment is 20 to 25 min.

[0017] In some embodiments, the CO2 concentration of the first stage carbonization treatment is 24% to 28%, the pressure of the first stage carbonization treatment is 0.02 to 0.04 MPa, and the carbonization time of the first stage carbonization treatment is 10 to 13 min; the CO2 concentration of the second stage carbonization treatment is 48% to 52%, the pressure of the second stage carbonization treatment is 0.13 to 0.17 MPa, and the carbonization time of the second stage carbonization treatment is 15 to 18 min; the CO2 concentration of the third stage carbonization treatment is 72% to 78%, the pressure of the third stage carbonization treatment is 0.35 to 0.45 MPa, and the carbonization time of the third stage carbonization treatment is 20 to 22 min; the CO2 concentration of the fourth stage carbonization treatment is 95% to 100%, the pressure of the fourth stage carbonization treatment is 0.8 to 1 MPa, and the carbonization time of the fourth stage carbonization treatment is 35 to 50 min.

[0018] In some embodiments, the sources of the plurality of aerated concrete panels include: cutting and pre-curing the aerated concrete original panels obtained after pouring.

[0019] In some implementations, the cutting process is performed when the hardness of the aerated concrete original board is 450-600.

[0020] In some embodiments, the humidity of the environment during the pre-curing treatment is greater than 90%, and the strength of the board after the pre-curing treatment is 1 to 1.5 MPa.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The method of the present invention is applicable to industrial-grade aerated concrete panels. By increasing the contact surface between the aerated concrete panels and CO2 and combining with suitable carbonization treatment conditions, the panels can be uniformly and completely carbonized while ensuring the apparent properties and mechanical properties of industrial-grade aerated concrete, thereby effectively increasing the carbon fixation amount of the panels. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 It is a structural schematic diagram of the partition of the present invention;

[0025] Figure 2 Schematic diagram of the structure of the stack in Example 1 of the present invention.

[0026] Reference numerals:

[0027] 1- partition, 101- first surface, 1011- first recessed structure, 1012- first boss, 102- second surface, 1021- second recessed structure, 1022- second boss, 2- aerated concrete board. DETAILED DESCRIPTION

[0028] 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.

[0029] A method for curing an aerated concrete plate comprises the following steps:

[0030] A plurality of aerated concrete panels are stacked and arranged, and an isolation device is provided between the aerated concrete panels of any adjacent layers to obtain a stacked body; the stacked body is subjected to N-level carbonization treatment, N>2, and in the carbonization process from the first level to the Nth level, the CO2 concentration in the carbonization gas is increasing, the pressure of the carbonization treatment is increasing, and the time of the carbonization treatment is increasing; the CO2 concentration of the first level carbonization treatment is 20% to 30%, the pressure is 0.01 to 0.05 MPa, and the carbonization time is 10 to 15 minutes.

[0031] The method of the present invention is applicable to industrial-grade aerated concrete plates. By increasing the contact surface between the aerated concrete plates and CO2 and matching appropriate carbonization treatment conditions, the plates can be uniformly and completely carbonized while ensuring the apparent performance and mechanical properties of industrial-grade aerated concrete, thereby effectively increasing the carbon fixation amount of the plates. The method is applicable to existing aerated concrete production lines and has strong practicality.

[0032] In some embodiments, the length of the air concrete board is 100-500 cm, the width is 40-80 cm, and the height is 10-25 cm. In some embodiments, the length is, for example, 100 cm, 150 cm, 200 cm, 300 cm, 350 cm, 400 cm, 450 cm, 500 cm, etc. The width is, for example, 40 cm, 45 cm, 50 cm, 55 cm, 60 cm, 65 cm, 70 cm, 80 cm, etc., and the height is, for example, 10 cm, 12 cm, 15 cm, 18 cm, 20 cm, 25 cm, etc.

[0033] In some embodiments, the isolation device includes a partition. The material of the isolation device includes polytetrafluoroethylene. The partition is used to form a suitable gap between the multiple aerated concrete plates, which is conducive to making the subsequent carbonization treatment more uniform and comprehensive, so that the carbonization is complete and the carbon fixation amount is guaranteed.

[0034] In some embodiments, the isolation device includes a plurality of partitions, wherein the partitions of each layer are arranged at intervals along the length direction of the aerated concrete board, and the length direction of each partition is perpendicular to the length direction of the aerated concrete board; the partition has a first surface and a second surface relative to each other, and along the length direction of the partition, the first surface has a plurality of spaced first recessed structures, and a first boss is formed between any adjacent first recessed structures, and the second surface has a plurality of spaced second recessed structures, and a second boss is formed between any adjacent second recessed structures, and the extension direction of the first recessed structure and the extension direction of the second recessed structure are respectively perpendicular to the length direction of the partition.

[0035] In some embodiments, the partition is a square structure, and the height of the partition is 5.5 to 13 cm, such as 5.5 cm, 6 cm, 7 cm, 8 cm, 9 cm, 10 cm, 11 cm, 12 cm or 13 cm; the width of the partition is 3 to 10 cm, such as 3 cm, 4 cm, 5 cm, 6 cm, 7 cm, 8 cm, 9 cm, 10 cm, etc.; the length of the partition is the same as the width of the aerated concrete board. The first concave structure and the second concave structure are each independently semicircular curved surface, and the spacing between adjacent first bosses and the spacing between adjacent second bosses are each independently 5 to 10 cm, such as 5 cm, 6 cm, 7 cm, 8 cm, 9 cm or 10 cm. The width of the first boss and the second boss is each 3 to 10 cm, such as 3 cm, 4 cm, 5 cm, 6 cm, 7 cm, 8 cm, 9 cm or 10 cm. The distance between any adjacent partitions of each layer is 30 to 50 cm, for example, 30 cm, 35 cm, 40 cm, 45 cm, 50 cm, etc. In some embodiments, the multiple first concave structures on the first surface and the multiple second concave structures on the second surface correspond to each other and are symmetrically arranged. The first boss and the second boss correspond to each other and are symmetrically arranged. In some embodiments, the number and size of the partitions of each layer are the same, and the partitions of any layer are arranged one by one along the stacking direction of the aerated concrete board.

[0036] In the present invention, the isolation device is set up with the above conditions, such as an appropriate spacing between adjacent first bosses, an appropriate spacing between adjacent second bosses, an appropriate width of the first boss and the second boss, and the distance between any adjacent partitions in each layer. This can ensure better support for the concrete slab during the subsequent carbonization treatment, prevent deformation of the slab from affecting its final surface properties and mechanical properties, and at the same time, CO2 can be more fully in contact with the concrete slab to achieve efficient carbonization and increase carbon fixation.

[0037] In some embodiments, the method for obtaining the above-mentioned stacked body specifically includes: placing M spaced partitions on the side panels of the mold box to form a first layer of isolation device, using a clamping device (such as a board breaking machine) to clamp the concrete slab and place it on the above-mentioned first layer of isolation device, and then placing M spaced partitions on the above-mentioned first concrete slab, which are arranged one-to-one with the partitions of the first layer of isolation device, that is, the number of the second layer of isolation devices is consistent with that of the first layer of isolation devices, and the positions correspond to each other, forming a second layer of isolation device, and then placing a second concrete slab on the second layer of isolation device, and so on, until all concrete slabs are separated by isolation devices.

[0038] In some embodiments, N is 3 to 6, for example, 3 times, 4 times, 5 times or 6 times. The present invention adopts a suitable number of carbonization treatments to be more conducive to the carbonization effect.

[0039] In some implementations, the N-stage carbonization uses a carbonization working gas, and the CO2 concentration in the working gas of the first-stage carbonization treatment is 20% to 30%, where the CO2 concentration refers to the volume concentration, and the remaining gas includes other components of the air.

[0040] In some embodiments, the CO2 concentration of the first stage carbonization treatment is 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, etc., the pressure of the first stage carbonization treatment is 0.01-0.05 MPa, for example, 0.01 MPa, 0.02 MPa, 0.03 MPa, 0.04 MPa, 0.045 MPa, 0.05 MPa, etc., and the carbonization time of the first stage carbonization treatment is 10-15 min, for example, 10 min, 11 min, 12 min, 13 min, 14 min or 15 min, etc. The CO2 concentration of the Nth carbonization treatment is 90% to 100%, such as 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100%, etc. The pressure of the Nth carbonization treatment is 0.7 to 1MPa, such as 0.7MPa, 0.75MPa, 0.8MPa, 0.85MPa, 0.9MPa or 1MPa, etc. The carbonization time of the Nth carbonization treatment is 30 to 60min, such as 30min, 35min, 40min, 45min, 50min, 55min or 60min, etc. The present invention adopts appropriate first-stage carbonization treatment conditions to make the initial carbonization reaction degree appropriate and the heat released appropriate. Subsequently, the carbon dioxide concentration and reaction pressure are increased step by step so that the concrete board can better adapt to the carbonization conditions, ensuring that the final concrete board has excellent apparent properties, mechanical properties and carbonization effect.

[0041] In some embodiments, the temperature of each carbonization treatment is 25-80°C, such as 25°C, 30°C, 35°C, 40°C, 45°C, 50°C, 55°C, 60°C, 70°C or 80°C, etc. In some embodiments, the carbonization temperature of each example is 65°C.

[0042] In some embodiments, the number N of carbonization treatments of the present invention is 4, wherein the CO2 concentration of the second stage carbonization treatment is 45% to 55%, for example, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54% or 55%, etc., the pressure of the second stage carbonization treatment is 0.1 to 0.2 MPa, for example, 0.1 MPa, 0.11 MPa, 0.15 MPa, 0.16 MPa, 0.18 MPa, 0.2 MPa, etc., and the carbonization time of the second stage carbonization treatment is 15 to 20 min, for example, 15 min, 16 min, 17 min, 18 min, 19 min or 20 min, etc. The CO2 concentration of the third-stage carbonization treatment is 70% to 80%, such as 70%, 71%, 73%, 75%, 76%, 78%, 80%, etc. The pressure of the third-stage carbonization treatment is 0.3 to 0.5 MPa, such as 0.3 MPa, 0.35 MPa, 0.4 MPa, 0.45 MPa, 0.5 MPa, etc. The carbonization time of the third-stage carbonization treatment is 20 to 25 minutes, such as 20 minutes, 21 minutes, 22 minutes, 23 minutes, 24 minutes or 25 minutes, etc. The four-stage carbonization treatment of the present invention adopts the above-mentioned suitable conditions to make the concrete roller soil board better adapt to the changes in suitable carbonization conditions to ensure the apparent properties, mechanical properties and carbonization effect of the final concrete moving material.

[0043] In some preferred embodiments, the CO2 concentration of the first stage carbonization treatment is 24% to 28%, the pressure of the first stage carbonization treatment is 0.02 to 0.04 MPa, and the carbonization time of the first stage carbonization treatment is 10 to 13 min; the CO2 concentration of the second stage carbonization treatment is 48% to 52%, the pressure of the second stage carbonization treatment is 0.13 to 0.17 MPa, and the carbonization time of the second stage carbonization treatment is 15 to 18 min; the CO2 concentration of the third stage carbonization treatment is 72% to 78%, the pressure of the third stage carbonization treatment is 0.35 to 0.45 MPa, and the carbonization time of the third stage carbonization treatment is 20 to 22 min; the CO2 concentration of the fourth stage carbonization treatment is 95% to 100%, the pressure of the fourth stage carbonization treatment is 0.8 to 1 MPa, and the carbonization time of the fourth stage carbonization treatment is 35 to 50 min. The present invention can better carbonize the aerated concrete board by further optimizing the carbonization treatment stages and the conditions corresponding to each stage, thereby ensuring the final high quality and high carbon fixation amount.

[0044] In some embodiments, the source of the plurality of aerated concrete panels includes: cutting and pre-curing the original aerated concrete panels obtained after pouring. By adopting appropriate cutting and pre-curing, a good foundation can be laid for the subsequent carbonization treatment.

[0045] In some embodiments, the cutting process is performed when the hardness of the aerated concrete original plate is 450-600. The hardness of the aerated concrete original plate is appropriate to meet the subsequent operations. If the hardness of the aerated concrete original plate is not enough, the plate obtained after the final carbonization will be deformed and the strength will be reduced. The cutting process uses steel wire, and the blank is cut into horizontally stacked plates by horizontal cutting. The diameter of the steel wire is 0.6-1.5mm, such as 0.6mm, 0.7mm, 0.8mm, 1mm, 1.2mm or 1.5mm. Steel wire with appropriate diameter is conducive to ensuring cutting quality. If the cutting wire is too thin and the cutting seam is too narrow, the hydration of the cementitious material after cutting will bond the upper and lower plates together, affecting the subsequent carbonization process.

[0046] In some embodiments, the humidity of the pre-curing environment is greater than 90%, such as 90%, 92%, 95%, 96%, 98% or 100%, and the pre-curing is performed to a strength of the board of 1 to 1.5 MPa, such as 1 MPa, 1.2 MPa, 1.3 MPa, 1.4 MPa or 1.5 MPa. The strength of the aerated concrete board before carbonization treatment is too low, and the board breaking machine is easy to crush the board.

[0047] In some embodiments, the method for preparing the above-mentioned aerated concrete original board includes: by weight, 25 to 35 parts of P·Ⅱ52.5 cement, 15 to 25 parts of aerated concrete with a specific surface area of ​​350 to 400 kg / m 2 Steel slag, 35-45 parts of granite tailings with a sieve residue of 4%-6% on a 80μm square hole sieve, 1-3 parts of desulfurized gypsum stone, and 1-3 parts of lime are placed in a mixer and stirred evenly, and then water is added to control the water-to-material ratio to 0.3-0.4. An appropriate amount of water reducer is used to adjust the fluidity of the slurry to 280-320mm. After adding water and stirring for 1-3 minutes, 0.2%-0.4% of the mass of the cementitious material is added to the aluminum powder paste, and then stirred for 40s-1.5min to obtain concrete slurry, which is poured into an industrial mold box to obtain an aerated concrete original board. The water reducer uses a conventional concrete water reducer, such as a polycarboxylic acid water reducer, a sodium lignin sulfonate water reducer, a naphthalene-based high-efficiency water reducer, and the like. Polycarboxylic acid water reducers can be used in each embodiment and comparative example.

[0048] The following is further explained in conjunction with specific embodiments and comparative examples.

[0049] Example 1

[0050] A method for curing an industrial-grade aerated concrete plate comprises the following steps:

[0051] (a) Obtaining an aerated concrete original board, comprising: mixing 30 parts of P·Ⅱ52.5 cement, 20 parts of a specific surface area of ​​385 kg / m 2Steel slag, 40 parts of granite tailings with a 80μm square hole sieve residue of 5%, 2.5 parts of desulfurized gypsum stone, and 2.5 parts of lime are placed in a mixer and stirred evenly, then water is added to control the water-to-material ratio to 0.35. An appropriate amount of water reducer is used to adjust the fluidity of the slurry to 300mm. After adding water and stirring for 2 minutes, 0.3% of the aluminum powder paste by weight of the cementitious material is added, and then stirred for another 1 minute to obtain concrete slurry. The slurry is poured into an industrial mold box. After pouring, a hardness tester is used to measure the hardness of the cast body. When the hardness develops to 450, a 0.6mm steel wire is used to horizontally cut the body into upper and lower stacked plates.

[0052] (b) After the cutting is completed, the cut plates are placed in an environment with a humidity of 90% for pre-curing until the plate strength reaches 1 MPa, thereby obtaining a plurality of aerated concrete plates 2. Each aerated concrete plate 3 is 465 cm long, 55 cm wide and 20 cm high.

[0053] (c) stacking the plurality of aerated concrete panels 2 obtained in step (b) and providing an isolation device between any adjacent layers of aerated concrete panels 2 to obtain a stacked body. Figure 2 As shown; the isolation device includes a plurality of partitions 1, the partition 1 is as Figure 1 As shown, the partitions 1 of each layer are arranged at intervals along the length direction of the aerated concrete plate 2, and the length direction of the partitions 1 is perpendicular to the length direction of the aerated concrete plate 2, and the number of partitions 1 in any layer is the same and the positions correspond one to one; the partition 1 has a first surface 101 and a second surface 102 relative to each other, the first surface 101 has a plurality of spaced first recessed structures 1011, and a first boss 1012 is formed between any adjacent first recessed structures 1011, the second surface 102 has a plurality of spaced second recessed structures 1021, and a second boss 1022 is formed between any adjacent second recessed structures 1021, the first boss 1012 and the second boss 1022 are arranged opposite to each other, and the extension direction of a recessed structure 1011 and the extension direction of the second recessed structure 1021 are respectively perpendicular to the length direction of the partition 1. The first recessed structure 1011 and the second recessed structure 1021 are each independently semicircular, the spacing between adjacent first bosses 1012 and the spacing between adjacent second bosses 1022 are each independently 5 cm (i.e., the diameter of the semicircular surface is 5 cm), and the width of the first boss 1012 and the second boss 1022 are each 3 cm; the height of the partition 1 is 5.5 cm, the width is 3 cm, and the length of the partition 1 is the same as the width of the aerated concrete board 2; in the same layer, the spacing distance between adjacent partitions 1 is 30 cm; the partition material is polytetrafluoroethylene.

[0054] (d) The laminate obtained in the above step (c) is sent to a carbonization kettle for four-stage carbonization treatment: the CO2 concentration of the first stage carbonization treatment is 20%, the pressure is 0.01 MPa, and the carbonization time is 10 min; the CO2 concentration of the second stage carbonization treatment is 45%, the pressure is 0.1 MPa, and the carbonization time is 15 min; the CO2 concentration of the third stage carbonization treatment is 70%, the pressure is 0.3 MPa, and the carbonization time is 20 min; the CO2 concentration of the fourth stage carbonization treatment is 90%, the pressure is 0.7 MPa, and the carbonization time is 30 min.

[0055] Example 2

[0056] A method for curing an industrial-grade aerated concrete plate comprises the following steps:

[0057] (a) A concrete slurry was prepared according to step (a) of Example 1, and the slurry was poured into an industrial mold box. After the pouring was completed, the hardness of the cast body was measured by a hardness tester. When the hardness reached 500, a 1 mm steel wire was used to horizontally cut the body into upper and lower stacked plates.

[0058] (b) After the cutting is completed, the cut plates are placed in an environment with a humidity of 95% for pre-curing until the plate strength reaches 1 MPa, thereby obtaining a plurality of aerated concrete plates 2. Each aerated concrete plate 3 is 455 cm long, 60 cm wide and 10 cm high.

[0059] (c) stacking the plurality of aerated concrete panels 2 obtained in step (b) and providing an isolation device between any adjacent layers of aerated concrete panels 2 to obtain a stacked body. Figure 2 As shown, the isolation device includes a plurality of partitions 1, and the partitions 1 are as shown in FIG. Figure 1As shown, the partitions 1 of each layer are arranged at intervals along the length direction of the aerated concrete plate 2, and the length direction of the partitions 1 is perpendicular to the length direction of the aerated concrete plate 2, and the number of partitions 1 in any layer is the same and the positions correspond one to one; the partition 1 has a first surface 101 and a second surface 102 relative to each other, the first surface 101 has a plurality of spaced first recessed structures 1011, and a first boss 1012 is formed between any adjacent first recessed structures 1011, the second surface 102 has a plurality of spaced second recessed structures 1021, and a second boss 1022 is formed between any adjacent second recessed structures 1021, the first boss 1012 and the second boss 1022 are arranged opposite to each other, and the extension direction of a recessed structure 1011 and the extension direction of the second recessed structure 1021 are respectively perpendicular to the length direction of the partition 1. The first recessed structure 1011 and the second recessed structure 1021 are each independently semicircular, the spacing between adjacent first bosses 1012 and the spacing between adjacent second bosses 1022 are each independently 6 cm (i.e., the diameter of the semicircular surface is 6 cm), the width of the first boss 1012 and the second boss 1022 are each 4 cm; the height of the partition 1 is 7 cm and the width is 5 cm; the length of the partition 1 is the same as the width of the aerated concrete board 2; in the same layer, the spacing distance between adjacent partitions 1 is 40 cm; the partition material is polytetrafluoroethylene.

[0060] (d) The laminate obtained in the above step (c) is sent to a carbonization kettle for four-stage carbonization treatment: the CO2 concentration of the first stage carbonization treatment is 25%, the pressure is 0.03 MPa, and the carbonization time is 13 min; the CO2 concentration of the second stage carbonization treatment is 50%, the pressure is 0.15 MPa, and the carbonization time is 18 min; the CO2 concentration of the third stage carbonization treatment is 75%, the pressure is 0.4 MPa, and the carbonization time is 23 min; the CO2 concentration of the fourth stage carbonization treatment is 95%, the pressure is 0.8 MPa, and the carbonization time is 45 min.

[0061] Example 3

[0062] A method for curing an industrial-grade aerated concrete plate comprises the following steps:

[0063] (a) A concrete slurry was prepared according to step (a) of Example 1, and the slurry was poured into an industrial mold box. After the pouring was completed, the hardness of the cast body was measured by a hardness tester. When the hardness reached 600, a 1.5 mm steel wire was used to horizontally cut the body into upper and lower stacked plates.

[0064] (b) After the cutting is completed, the cut plates are placed in an environment with a humidity of 100% for pre-curing until the plate strength reaches 1 MPa, thereby obtaining a plurality of aerated concrete plates 2. Each aerated concrete plate 3 is 470 cm long, 70 m wide and 25 cm high.

[0065] (c) stacking the plurality of aerated concrete panels 2 obtained in step (b) and providing an isolation device between any adjacent layers of aerated concrete panels 2 to obtain a stacked body. Figure 2 As shown, the isolation device includes a plurality of partitions 1, and the partitions 1 are as shown in FIG. Figure 1 As shown, the partitions 1 of each layer are arranged at intervals along the length direction of the aerated concrete plate 2, and the length direction of the partitions 1 is perpendicular to the length direction of the aerated concrete plate 2, and the number of partitions 1 in any layer is the same and the positions correspond one to one; the partition 1 has a first surface 101 and a second surface 102 relative to each other, the first surface 101 has a plurality of spaced first recessed structures 1011, and a first boss 1012 is formed between any adjacent first recessed structures 1011, the second surface 102 has a plurality of spaced second recessed structures 1021, and a second boss 1022 is formed between any adjacent second recessed structures 1021, the first boss 1012 and the second boss 1022 are arranged opposite to each other, and the extension direction of a recessed structure 1011 and the extension direction of the second recessed structure 1021 are respectively perpendicular to the length direction of the partition 1. The first recessed structure 1011 and the second recessed structure 1021 are each independently semicircular surfaces, the spacing between adjacent first bosses 1012 and the spacing between adjacent second bosses 1022 are each independently 10 cm (that is, the diameter of the semicircular surface is 10 cm), the width of the first boss 1012 and the second boss 1022 are each 10 cm, the height of the partition 1 is 13 cm, and the width is 10 cm; the length of the partition 1 is the same as the width of the aerated concrete board 2; in the same layer, the spacing distance between adjacent partitions 1 is 50 cm; the partition material is polytetrafluoroethylene.

[0066] (d) The laminate obtained in the above step (c) is sent to a carbonization kettle for four-stage carbonization treatment: the CO2 concentration of the first stage carbonization treatment is 30%, the pressure is 0.05 MPa, and the carbonization time is 15 min; the CO2 concentration of the second stage carbonization treatment is 55%, the pressure is 0.2 MPa, and the carbonization time is 20 min; the CO2 concentration of the third stage carbonization treatment is 80%, the pressure is 0.5 MPa, and the carbonization time is 25 min; the CO2 concentration of the fourth stage carbonization treatment is 100%, the pressure is 1 MPa, and the carbonization time is 60 min.

[0067] Example 4

[0068] A method for maintaining an industrial-grade aerated concrete plate is different from that of Example 1 in that:

[0069] In the same layer, the spacing distance between adjacent partitions 1 is 60 cm.

[0070] Example 5

[0071] A method for maintaining an industrial-grade aerated concrete plate is different from that of Example 1 in that:

[0072] The width of the first boss 1012 and the second boss 1022 are each 2 cm.

[0073] Comparative Example 1

[0074] A method for maintaining an industrial-grade aerated concrete plate is different from that of Example 1 in that:

[0075] The multiple aerated concrete panels obtained in step (b) are directly stacked without providing an isolation device.

[0076] Comparative Example 2

[0077] A method for maintaining an industrial-grade aerated concrete plate is different from that of Example 3 in that:

[0078] The concentration of CO2 in the 1st to 4th stage carbonization treatments is 100%.

[0079] Comparative Example 3

[0080] A method for maintaining an industrial-grade aerated concrete plate is different from Example 2 in that:

[0081] In step (d), the stack obtained in step (c) is sent to a carbonization kettle for three-stage carbonization treatment: the CO2 concentration of the first stage carbonization treatment is 30%, the pressure is 0.1 MPa, and the carbonization time is 10 min; the CO2 concentration of the second stage carbonization treatment is 50%, the pressure is 0.3 MPa, and the carbonization time is 20 min; the CO2 concentration of the third stage carbonization treatment is 100%, the pressure is 0.5 MPa, and the carbonization time is 20 min.

[0082] Comparative Example 4

[0083] A method for maintaining an industrial-grade aerated concrete plate is different from that of Example 1 in that:

[0084] In step (a), when the hardness develops to 400, the blank is horizontally cut into upper and lower stacked plates using a 0.6 mm steel wire.

[0085] Comparative Example 5

[0086] A carbonization curing method for an industrial-grade aerated concrete plate is different from Example 1 in that:

[0087] In step (b), the cut plate is placed in an environment with a humidity of 90% for pre-curing until the plate strength reaches 0.5 MPa.

[0088] Experimental example

[0089] The aerated concrete panels obtained by the curing methods of each embodiment and comparative example were tested for appearance, carbonization, and strength. Among them, the appearance test uses naked eye observation combined with a level to determine the appearance quality and surface flatness. The carbonization condition is determined by cutting the panel perpendicular to the long side along the midpoint of the long side, and then observing the interface color through a phenolphthalein color reaction. The strength determination method is determined in accordance with GB / T11969-2020 "Autoclaved Aerated Concrete Performance Test Method". The details are shown in Table 1.

[0090] Table 1 Test results

[0091]

[0092] It can be seen from the above that the curing method of the industrial-grade aerated concrete board of the present invention can obtain high-quality, high-strength and completely carbonized aerated concrete boards through the coordination of various steps. The strength of the aerated concrete boards of Examples 1 to 3 is greater than or equal to 6 MPa.

[0093] The method in Example 4 can achieve complete carbonization. The aerated concrete board has a certain degree of pressure, but the adjacent partitions are placed slightly wide. The board shrinks slightly during the carbonization process and its own weight causes the concrete board to have a slight bending deformation compared to Example 1.

[0094] The method in Example 5 can achieve complete carbonization, and the aerated concrete board has a certain degree of pressure, but the width of the boss is too narrow, and the width of the upper and lower platforms in contact with the board is narrow, resulting in a small stress area at the stress point and a large pressure per unit area, resulting in marks, and the appearance performance is slightly worse than that of Example 1.

[0095] In Comparative Example 1, no isolation device is provided, and the adjacent plates are bonded together and then carbonized, resulting in that CO2 cannot completely penetrate into the interior and is not completely carbonized.

[0096] In Comparative Example 2, the concentration of CO2 in each carbonization treatment is 100%. When high-concentration CO2 is used for carbonization, the carbonization reaction is violent at the beginning, a large amount of heat is released in a short period of time, the temperature rises rapidly, and the large volume of the board causes the board to crack and have poor strength.

[0097] In Comparative Example 3, the initial carbonization pressure of the first-stage carbonization treatment was too high, resulting in a violent carbonization reaction, uneven increase in the temperature of the plate, and the plate was in a thin sheet shape, resulting in cracking of the plate. In addition, the final carbonization pressure was low, resulting in incomplete carbonization.

[0098] In Comparative Example 4, the blank was not hard enough during cutting, resulting in deformation of the sheet and reduced strength.

[0099] In Comparative Example 5, the strength of the aerated concrete board before carbonization treatment is too low, and the board breaking machine can easily crush the board.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. 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.

Claims

1. A method for curing an aerated concrete plate, characterized in that: The following steps are involved: Stacking a plurality of aerated concrete panels, and providing an isolation device between the aerated concrete panels in any adjacent layers to obtain a stacked body; The stack is subjected to N-level carbonization treatment, N>2, and during the carbonization process from the 1st level to the Nth level, the CO2 concentration in the carbonization gas shows an increasing trend, the pressure of the carbonization treatment shows an increasing trend, and the time of the carbonization treatment shows an increasing trend; the CO2 concentration of the first level carbonization treatment is 20% to 30%, the pressure is 0.01 to 0.05 MPa, and the carbonization time is 10 to 15 minutes.

2. The curing method of aerated concrete board according to claim 1, characterized in that: The isolation device comprises a plurality of partitions, wherein the partitions of each layer are arranged at intervals along the length direction of the aerated concrete board, and the length direction of the partitions is perpendicular to the length direction of the aerated concrete board; The partition has a first surface and a second surface relative to each other. Along the length direction of the partition, the first surface has a plurality of spaced first recessed structures, and a first boss is formed between any adjacent first recessed structures. The second surface has a plurality of spaced second recessed structures, and a second boss is formed between any adjacent second recessed structures. The extension direction of the first recessed structure and the extension direction of the second recessed structure are respectively perpendicular to the length direction of the partition.

3. The curing method of aerated concrete board according to claim 2, characterized in that: Contains at least one of the following features (1) to (3): (1) The first concave structure and the second concave structure are each independently a semicircular curved surface; (2) The spacing between adjacent first bosses and the spacing between adjacent second bosses are each independently 5 to 10 cm, the width of the first boss and the width of the second boss are each 3 to 10 cm, the height of the partition is 5.5 to 13 cm, the width of the partition is 3 to 10 cm, and the length of the partition is the same as the width of the aerated concrete board; (3) The distance between any adjacent partitions in each layer is 30 to 50 cm.

4. The curing method of aerated concrete board according to claim 1, characterized in that: The N is 3-6.

5. The curing method of aerated concrete board according to claim 1, characterized in that: The CO2 concentration of the N-th stage carbonization treatment is 90% to 100%, the pressure of the N-th stage carbonization treatment is 0.7 to 1 MPa, and the carbonization time of the N-th stage carbonization treatment is 30 to 60 minutes.

6. The curing method of aerated concrete board according to claim 5, characterized in that: The N is 4, wherein the CO2 concentration of the second stage carbonization treatment is 45% to 55%, the pressure of the second stage carbonization treatment is 0.1 to 0.2 MPa, and the carbonization time of the second stage carbonization treatment is 15 to 20 min; the CO2 concentration of the third stage carbonization treatment is 70% to 80%, the pressure of the third stage carbonization treatment is 0.3 to 0.5 MPa, and the carbonization time of the third stage carbonization treatment is 20 to 25 min.

7. The curing method of aerated concrete board according to claim 6, characterized in that: The CO2 concentration of the first stage carbonization treatment is 24% to 28%, the pressure of the first stage carbonization treatment is 0.02 to 0.04 MPa, and the carbonization time of the first stage carbonization treatment is 10 to 13 minutes; the CO2 concentration of the second stage carbonization treatment is 48% to 52%, the pressure of the second stage carbonization treatment is 0.13 to 0.17 MPa, and the carbonization time of the second stage carbonization treatment is 15 to 18 minutes; the CO2 concentration of the third stage carbonization treatment is 72% to 78%, the pressure of the third stage carbonization treatment is 0.35 to 0.45 MPa, and the carbonization time of the third stage carbonization treatment is 20 to 22 minutes; the CO2 concentration of the fourth stage carbonization treatment is 95% to 100%, the pressure of the fourth stage carbonization treatment is 0.8 to 1 MPa, and the carbonization time of the fourth stage carbonization treatment is 35 to 50 minutes.

8. The curing method of aerated concrete board according to claim 1, characterized in that: The sources of the plurality of aerated concrete panels include: cutting and pre-curing the aerated concrete original panels obtained after pouring.

9. The curing method of aerated concrete board according to claim 8, characterized in that: The cutting process is performed when the hardness of the aerated concrete original plate is 450-600.

10. The curing method of aerated concrete board according to claim 8, characterized in that: The environmental humidity of the pre-curing treatment is greater than 90%, and the pre-curing treatment is performed to a strength of the plate of 1 to 1.5 MPa.

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