CN115521127A - Aerated concrete and preparation method thereof - Google Patents
Aerated concrete and preparation method thereof Download PDFInfo
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- CN115521127A CN115521127A CN202211297977.5A CN202211297977A CN115521127A CN 115521127 A CN115521127 A CN 115521127A CN 202211297977 A CN202211297977 A CN 202211297977A CN 115521127 A CN115521127 A CN 115521127A
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- 239000004567 concrete Substances 0.000 title claims abstract description 60
- 238000002360 preparation method Methods 0.000 title abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000000463 material Substances 0.000 claims abstract description 32
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 28
- 239000004568 cement Substances 0.000 claims abstract description 23
- 239000010881 fly ash Substances 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000006260 foam Substances 0.000 claims abstract description 14
- 239000003381 stabilizer Substances 0.000 claims abstract description 14
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 13
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 13
- 150000004683 dihydrates Chemical class 0.000 claims abstract description 13
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 13
- 239000010440 gypsum Substances 0.000 claims abstract description 13
- 239000004571 lime Substances 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 10
- 239000002002 slurry Substances 0.000 claims description 44
- 230000033558 biomineral tissue development Effects 0.000 claims description 33
- 238000012423 maintenance Methods 0.000 claims description 17
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 8
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 7
- 239000011398 Portland cement Substances 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 235000008429 bread Nutrition 0.000 claims description 6
- 239000000292 calcium oxide Substances 0.000 claims description 6
- 235000012255 calcium oxide Nutrition 0.000 claims description 6
- 238000001746 injection moulding Methods 0.000 claims description 6
- 239000002480 mineral oil Substances 0.000 claims description 6
- 235000010446 mineral oil Nutrition 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 229920003086 cellulose ether Polymers 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- WPJGWJITSIEFRP-UHFFFAOYSA-N 1,3,5-triazine-2,4,6-triamine;hydrate Chemical compound O.NC1=NC(N)=NC(N)=N1 WPJGWJITSIEFRP-UHFFFAOYSA-N 0.000 claims description 4
- 229920001732 Lignosulfonate Polymers 0.000 claims description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 4
- 108010082495 Dietary Plant Proteins Proteins 0.000 claims description 3
- 241001465754 Metazoa Species 0.000 claims description 3
- -1 alkylbenzene sulfonate Chemical class 0.000 claims description 3
- 150000001408 amides Chemical class 0.000 claims description 3
- 239000002956 ash Substances 0.000 claims description 3
- 239000003245 coal Substances 0.000 claims description 3
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 3
- 239000000194 fatty acid Substances 0.000 claims description 3
- 229930195729 fatty acid Natural products 0.000 claims description 3
- 150000004665 fatty acids Chemical class 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 229920005646 polycarboxylate Polymers 0.000 claims description 3
- 239000001397 quillaja saponaria molina bark Substances 0.000 claims description 3
- 229930182490 saponin Natural products 0.000 claims description 3
- 150000007949 saponins Chemical class 0.000 claims description 3
- IIACRCGMVDHOTQ-UHFFFAOYSA-M sulfamate Chemical compound NS([O-])(=O)=O IIACRCGMVDHOTQ-UHFFFAOYSA-M 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 8
- 239000004566 building material Substances 0.000 abstract description 7
- 238000009776 industrial production Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 24
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000002912 waste gas Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- 235000012241 calcium silicate Nutrition 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 230000001089 mineralizing effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000009919 sequestration Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012932 thermodynamic analysis Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 1
- 235000019976 tricalcium silicate Nutrition 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/02—Portland cement
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of building materials, and particularly provides aerated concrete which comprises the following components in percentage by mass: 30-60 parts of mineralized cementing material, 10-30 parts of cement, 15-30 parts of fly ash, 20-40 parts of lime, 3-6 parts of dihydrate gypsum, 0.05-0.15 part of gas former, 10-20 parts of mixing water, 0.01-1 part of foam stabilizer and 0.1-2 parts of water reducer. The aerated concrete provided by the invention adopts the mineralized gelled material as the main base material, and the air hardness principle and the excellent mechanical property of the mineralized gelled material are utilized, so that the cement consumption is greatly saved under the condition of the same strength, the consumption of high-carbon-increasing main materials of a certain scale can be saved, and the problem of carbon emission caused by industrial production can be solved. The invention also provides a preparation method of the aerated concreteMethod, can directly utilize CO discharged from industrial production 2 The curing process does not need pressurization, the process flow is simple, the time required by the mechanical property increase of the aerated concrete is effectively shortened, the curing energy consumption is reduced, and the environment-friendly and economic benefits are obvious.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to aerated concrete and a preparation method thereof.
Background
The climate change is a global problem faced by human beings, and with the emission of carbon dioxide in various countries, greenhouse gases are increased dramatically, which already form a serious threat to the global ecological environment and life system. CO 2 2 The theory of capture, sequestration and utilization (CCUS) is brought forward, and the CO is provided by the practical achievement of small scale in recent years 2 The capacity of net zero emission has important significance for the efficient utilization of fossil energy. CO 2 2 The mineralization utilization technology is taken as an important branch in the technology, and the technical means is mainly through CO 2 The calcium carbonate reacts with the calcium and magnesium alkaline components in natural minerals or industrial solid wastes to be converted into stable carbonate, thereby achieving the purpose of solid-phase storage of greenhouse gases. In connection with the current situation, concrete-like buildings occupy more than 80% of the global scale, with no doubt CO 2 The technology of mineralizing and curing concrete is considered to be the most potential CO for realizing large-scale industrial application 2 Techniques are utilized.
CO 2 The principle of mineralization maintenance is to utilize alkaline components (tricalcium silicate, dicalcium silicate, calcium hydroxide and calcium silicate hydrate gel) in the gelled material to accelerate carbonation reaction, compared with the conventional maintenance means, the mineralization maintenance can be adopted to efficiently utilize certain gelled materials with low hydration activity and high carbonation activity, and has important significance for promoting the establishment of a resource-saving society. The generated compact mineralized product is filled in the pores of the internal structure of the product, the mechanical and durable properties of the material are improved, and according to the knowledge of thermodynamic analysis, CO 2 The mineralization reaction can be carried out spontaneously in theory, the reaction degree is severe, a large amount of heat is released, the subsequent proceeding of the mineralization reaction is promoted indirectly, the energy consumption is saved, and the production efficiency of the aerated block is improved.
The aerated concrete is used as a wall material with the greatest development prospect, has the advantages of light weight, shock resistance, waste utilization, soil conservation, heat preservation, heat insulation, sound absorption, sound insulation and the like, and has higher commercial application value. Compared with common concrete building materials, the aerated concrete can reduce the self weight of a building, reduce the size of a designed building structure, reduce the bearing requirements of building structural members, save building material consumption and construction cost, and is widely applied to the construction of industrial and civil facilities (reinforced foundations, backfilled pipelines, roof insulation and the like) and certain basic facilities (such as bridges, culvert backfilling and road widening). However, most of the existing curing systems of aerated concrete adopt a steam pressurization mode to improve the product curing degree, the curing period is long, the energy consumption is high, the curing period is contrary to the great trend of energy conservation and emission reduction, and the serious waste is caused to limited resources.
For CO 2 In the mineralization curing aspect, aerated concrete is undoubtedly the preferred material for the mineralization curing of carbon dioxide, and the higher initial porosity of the aerated concrete is beneficial to the diffusion process, so that higher CO is achieved 2 And (5) maintaining the degree. Under the national introduction of policies for supporting the development of green energy-saving building materials, the market demand of aerated concrete is rising year by year. According to the current domestic production scale, if all CO is adopted 2 Mineralized and cured aerated concrete, calculated by the block density B06 and the carbon fixation rate of 10 percent, the CO of the aerated concrete is calculated every year 2 The consumption will exceed 500 million tons (as CO) 2 Mass meter). Research and development of CO 2 The mineralized maintenance aerated concrete not only can greatly absorb waste gas in the industrial production process, but also is beneficial to popularization and application of energy-saving and emission-reduction policies in building material industry.
Domestic to CO 2 The research starting time of the mineralized maintenance aerated concrete is short, the current research target only aims at improving the performance of mineralized products, and the high-purity CO is introduced into the mineralized products without exception for the selection of the maintenance mode 2 The method can greatly improve the mechanical property of the aerated concrete test piece in a short time by using a pressurized curing mode with gas as an auxiliary material, but the pressurizing process still generates energy consumption of a certain scale, and in addition, high-purity CO is introduced 2 The maintenance mode of gas is not in accordance with the actual and industrial productionThe waste gas has complex components, wherein the concentration of carbon dioxide is mostly between 10 and 20 percent, the waste gas needs to be subjected to pretreatment such as purification and enrichment, and the potential energy consumption of the aerated concrete product is improved.
The existing research on the mineralization and maintenance of aerated concrete mainly aims at the research on the mechanical properties of mineralized aerated concrete products. For example, CN202111265435.5 is a high-pressure carbonization method to prepare mineralized aerated concrete with density grade B05 and strength grade A5.0. However, the method has certain limitations and the energy consumption for preparing the product is higher. For another example, a mineralized curing mode is disclosed in chinese patent CN202111078165.7, and two curing technologies of steam autoclaving and carbon dioxide mineralization are coupled to cure the fly ash aerated block, so that the strength of the fly ash aerated block is further enhanced, steam consumption is reduced, and production efficiency is improved. Therefore, the aerated concrete product with low energy consumption and high mineralization activity is developed and prepared, and is a large-scale sealing and storing product for building material industry and utilizing CO 2 The method is an important measure for realizing energy conservation and emission reduction in the industry.
Disclosure of Invention
The invention aims to solve the problems of high energy consumption and complex preparation process in the preparation and maintenance processes of the existing mineralized aerated concrete.
Therefore, the invention provides aerated concrete which comprises the following components in percentage by mass: 30-60 parts of mineralized cementing material, 10-30 parts of cement, 15-30 parts of fly ash, 20-40 parts of lime, 3-6 parts of dihydrate gypsum, 0.05-0.15 part of gas former, 10-20 parts of mixing water, 0.01-1 part of foam stabilizer and 0.1-2 parts of water reducer.
Specifically, the mineralized cementitious material comprises gamma-C 2 S，β-C 2 S、C 3 S; the gamma-C is calculated by mass percentage 2 S≥90％，β-C 2 S≤5％，C 3 S≤8％。
Specifically, the fineness of the mineralized gelled material is 75 microns, and the screen residue is less than 1%.
Specifically, the fly ash is ash particles discharged in the coal burning process, and the residue of the fly ash after being sieved by a sieve with the diameter of 45 mu m is less than 20 percent.
Specifically, the lime is more than two-grade quicklime.
Specifically, the cement comprises one or more of ordinary portland cement, sulphoaluminate cement and ferro-aluminate cement; the gas former comprises one or more of animal and vegetable protein gas former, saponin gas former, fatty acid gas former, alkylbenzene sulfonate gas former, and aluminum powder paste; the foam stabilizer comprises one or more of cellulose ether, amide and polyvinyl alcohol; the water reducing agent comprises one or more of lignosulfonate water reducing agents, melamine water reducing agents, sulfamate water reducing agents and polycarboxylate water reducing agents.
The invention also provides a preparation method of the aerated concrete, which comprises the following steps:
(1) Preparing slurry: preparing a premix from the mineralized cementitious material, cement, fly ash, lime and dihydrate gypsum in a stirrer, uniformly mixing a water reducing agent and water, adding the mixture into the premix, and fully stirring to form a homogenized slurry; then adding a gas former and a foam stabilizer into the slurry and uniformly stirring to obtain slurry;
(2) Slurry injection molding: injecting the prepared slurry into a mold with the inner wall coated with mineral oil;
(3) Standing and maintaining: adjusting the temperature of the curing room, and curing the slurry and the die;
(4) Demolding and cutting: removing the mould, cutting off the bread heads of the mineralized aerated concrete blocks, and processing the shapes of the blocks as required;
(5) Pre-curing: curing the demolded and shaped building block;
(6) Mineralization maintenance: and transferring the pre-cured building block into a mineralization device under the normal temperature condition for mineralization curing.
Specifically, the step (3) is to adjust the temperature of the curing room, so that the slurry and the mold are cured for 4 to 6 hours in an environment of 50 to 60 ℃.
Specifically, the step (5) is to cure the demolded and shaped block for 1 to 3 days at 20. + -. 2 ℃ and 60. + -. 10% RH.
Specifically, the step (6) is to transfer the pre-cured building block into a mineralization device, and introduce 40-60% CO at a rate of 5-10L/min after sealing 2 And (3) gas, and simultaneously adjusting the air pressure in the exhaust valve control device to be close to the normal pressure state, wherein the mineralization curing time is 6-8h.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) The aerated concrete provided by the invention adopts the mineralized cementitious material as the main base material, and utilizes the air hardening principle and excellent mechanical property of the mineralized cementitious material to greatly save the cement consumption under the same strength condition, thereby not only saving the consumption of high-carbon-increasing main materials on a certain scale, but also solving the problem of carbon emission brought by industrial production.
(2) The preparation method of the aerated concrete provided by the invention can directly utilize CO discharged by industrial production 2 The curing process does not need pressurization, the process flow is simple, the time required by the mechanical property increase of the aerated concrete is effectively shortened, the curing energy consumption is reduced, and the environment and economic benefits are obvious.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Although representative embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that various modifications and changes may be made thereto without departing from the scope of the invention. Therefore, the scope of the present invention should not be limited to the embodiments, but should be defined by the appended claims and equivalents thereof.
The invention provides aerated concrete which comprises the following components in percentage by mass: 30-60 parts of mineralized cementing material, 10-30 parts of cement, 15-30 parts of fly ash, 20-40 parts of lime, 3-6 parts of dihydrate gypsum, 0.05-0.15 part of gas former, 10-20 parts of mixing water, 0.01-1 part of foam stabilizer and 0.1-2 parts of water reducer.
Wherein the mineralized gelled material is mainly composed of gamma-C 2 S, accompanied by a small amount of beta-C 2 S、C 3 S and the like, and the gamma-C is calculated by mass percent 2 S≥90％，β-C 2 S≤5％，C 3 S is less than or equal to 8 percent, and the fineness is less than 1 percent of 75 mu m screen residue;
the fly ash is micro ash particles discharged in the coal burning process of a thermal power plant, and the main component of the fly ash is SiO 2 、Al 2 O 3 And Fe 2 O 3 The residue is less than 20 percent after sieving with a sieve of 45 mu m;
the lime is more than two-grade quicklime;
the cement comprises one or more of ordinary portland cement, sulphoaluminate cement and ferro-aluminate cement, is used for improving the early strength of the sample and is convenient for demoulding and maintenance;
the gas former comprises one or more of animal and vegetable protein gas former, saponin gas former, fatty acid gas former, alkylbenzene sulfonate gas former, and aluminum powder paste; the foam stabilizer comprises one or more of cellulose ether, amide and polyvinyl alcohol; the water reducing agent comprises one or more of lignosulfonate water reducing agent, melamine water reducing agent, sulfamate water reducing agent and polycarboxylate water reducing agent. By reasonably preparing the proportion of the foaming agent to the foam stabilizer, the aerated concrete sample has better product appearance and internal pore structure, and spontaneous proceeding of the subsequent mineralization curing process is promoted.
The invention also provides
The preparation method of the aerated concrete comprises the following steps:
(1) Preparing slurry: preparing a premix from the mineralized cementitious material, cement, fly ash, lime and dihydrate gypsum in a stirrer, uniformly mixing a water reducing agent and water with the temperature higher than the normal temperature, and adding the mixture into the premix to be fully stirred to form homogenized slurry; then adding a gas former and a foam stabilizer into the slurry and uniformly stirring to obtain slurry;
(2) Slurry injection molding: injecting the prepared slurry into a mold with the inner wall coated with mineral oil;
(3) Standing and maintaining: adjusting the temperature of the curing room to enable the slurry and the die to be cured for 4-6 hours in an environment of 50-60 ℃;
(4) Demolding and cutting: removing the die, cutting off the bread heads of the mineralized aerated concrete blocks by using a 0.2-0.5mm steel wire saw, and processing the shapes of the blocks as required;
(5) Pre-curing: curing the demolded and shaped blocks at 20 + -2 deg.C and 60 + -10% RH for 1-3 days;
(6) Mineralization maintenance: transferring the pre-cured building block into a mineralization device at normal temperature, sealing, and introducing 40-60% CO at a rate of 5-10L/min 2 And (3) gas, and simultaneously adjusting the air pressure in the exhaust valve control device to be close to the normal pressure state, wherein the mineralization curing time is 6-8h.
The following examples are intended to study the effects of the aerated concrete and the method for producing the aerated concrete of the present invention.
Example 1:
the embodiment provides an aerated concrete, which comprises the following components in percentage by mass: 45 parts of mineralized cementitious material, 10 parts of ordinary portland cement, 20 parts of fly ash, 25 parts of quicklime, 4 parts of dihydrate gypsum, 0.14 part of aluminum powder, 10 parts of mixing water and 0.02 part of polyvinyl alcohol, and 0.64 part of polycarboxylic acid water reducing agent.
The aerated concrete is prepared by the following steps:
(1) Preparing slurry: preparing a premix from the mineralized cementitious material, cement, fly ash, lime and dihydrate gypsum in a stirrer, uniformly mixing a water reducing agent and water with the temperature higher than the normal temperature, and adding the mixture into the premix to be fully stirred to form homogenized slurry; then adding a foaming agent and a foam stabilizer into the slurry and uniformly stirring to prepare slurry;
(2) Slurry injection molding: injecting the prepared slurry into a mold with the inner wall coated with mineral oil;
(3) Standing and maintaining: adjusting the temperature of the curing room, and curing the slurry and the die for 6 hours in an environment of 60 ℃;
(4) Demolding and cutting: after the mould is disassembled, cutting off the bread heads of the mineralized aerated concrete blocks by using a 0.3mm steel wire saw, and processing the shapes of the blocks as required;
(5) Pre-curing: curing the demolded and shaped blocks at 20 deg.C and 70% RH for 1 day;
(6) Mineralization maintenance: transferring the pre-cured building block into a mineralization device under the normal temperature condition, and introducing 50% CO at the speed of 10L/min after sealing 2 And (3) gas, and meanwhile, the air pressure in the exhaust valve control device is adjusted to be close to the normal pressure state, and the mineralization curing time is 8 hours.
The mechanical property test of the mineralized aerated concrete block obtained in the above step shows that the dry density of the block is 603kg/m 3 The dry compressive strength is 3.8MPa, the requirements of A3.5 and B06 in GB11968-2020 Standard are met, and CO 2 Absorption rate of 126kg/m 3 。
Example 2:
the embodiment provides an aerated concrete, which comprises the following components in percentage by mass: 40 parts of mineralized cementing material, 10 parts of ordinary portland cement, 5 parts of sulphoaluminate cement, 25 parts of fly ash, 20 parts of quick lime, 3 parts of dihydrate gypsum, 0.12 part of aluminum powder, 12 parts of mixed water, 0.03 part of cellulose ether and 0.75 part of lignosulfonate water reducing agent.
The aerated concrete is prepared by the following steps:
(1) Preparing slurry: preparing a premix from the mineralized cementitious material, cement, fly ash, lime and dihydrate gypsum in a stirrer, uniformly mixing a water reducing agent and water with the temperature higher than the normal temperature, and adding the mixture into the premix to be fully stirred to form homogenized slurry; then adding a gas former and a foam stabilizer into the slurry and uniformly stirring to obtain slurry;
(2) Slurry injection molding: injecting the prepared slurry into a mold with the inner wall coated with mineral oil;
(3) Standing and maintaining: adjusting the temperature of the curing room, and curing the slurry and the die for 6 hours in an environment at 60 ℃;
(4) Demolding and cutting: removing the mould, cutting off the bread of the mineralized aerated concrete block by using a 0.3mm steel wire saw, and processing the shape of the block as required;
(5) Pre-curing: curing the demolded and shaped blocks at 20 deg.C and 60% RH for 2 days;
(6) Mineralization maintenance: transferring the pre-cured building block into a mineralization device under the normal temperature condition, and sealingThen introducing 60% CO at a rate of 10L/min 2 And (3) gas, and meanwhile, the air pressure in the exhaust valve control device is adjusted to be close to the normal pressure state, and the mineralization curing time is 6 hours.
The mechanical property test of the mineralized aerated concrete block obtained in the above step shows that the dry density of the block is 611kg/m 3 The dry compressive strength is 4.1MPa, the requirements of A3.5 and B06 in GB11968-2020 on CO 2 The absorption rate is 131kg/m 3 。
Example 3:
the embodiment provides an aerated concrete, which comprises the following components in percentage by mass: 45 parts of mineralized cementing material, 10 parts of ordinary portland cement, 5 parts of ferro-aluminate cement, 15 parts of fly ash, 20 parts of quick lime, 4 parts of dihydrate gypsum, 0.15 part of aluminum powder, 10 parts of mixed water, 0.02 part of cellulose ether and 0.64 part of melamine water reducer.
The aerated concrete is prepared by the following steps:
(1) Preparing slurry: preparing a premix from the mineralized cementitious material, cement, fly ash, lime and dihydrate gypsum in a stirrer, uniformly mixing a water reducing agent and water with the temperature higher than the normal temperature, and adding the mixture into the premix to be fully stirred to form homogenized slurry; then adding a gas former and a foam stabilizer into the slurry and uniformly stirring to obtain slurry;
(2) Slurry injection molding: injecting the prepared slurry into a mold with the inner wall coated with mineral oil;
(3) Standing and maintaining: adjusting the temperature of the curing room, and curing the slurry and the die for 6 hours in an environment at 60 ℃;
(4) Demolding and cutting: after the mould is disassembled, cutting off the bread heads of the mineralized aerated concrete blocks by using a 0.3mm steel wire saw, and processing the shapes of the blocks as required;
(5) Pre-curing: curing the demolded and shaped blocks at 20 deg.C and 55% RH for 3 days;
(6) Mineralization maintenance: transferring the pre-cured building block into a mineralization device under the normal temperature condition, and introducing 60% CO at the speed of 5L/min after sealing 2 Gas, simultaneously regulating the gas pressure in the exhaust valve control meansThe mineralization curing time is 8 hours when the pressure is close to the normal pressure state.
The mechanical property test of the mineralized aerated concrete block obtained in the above steps shows that the dry density of the block is 597kg/m 3 The dry compressive strength is 4.0MPa, the requirements of A3.5 and B06 in GB11968-2020 Standard are met, and CO 2 The absorption rate was 119kg/m 3 。
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims.
Claims (10)
1. The aerated concrete is characterized by comprising the following components in percentage by mass: 30-60 parts of mineralized cementing material, 10-30 parts of cement, 15-30 parts of fly ash, 20-40 parts of lime, 3-6 parts of dihydrate gypsum, 0.05-0.15 part of gas former, 10-20 parts of mixing water, 0.01-1 part of foam stabilizer and 0.1-2 parts of water reducer.
2. The aerated concrete of claim 1, wherein: the mineralized cementitious material comprises gamma-C 2 S，β-C 2 S、C 3 S; the gamma-C is calculated by mass percentage 2 S≥90％，β-C 2 S≤5％，C 3 S≤8％。
3. The aerated concrete of claim 2, wherein: the fineness of the mineralized gelled material is 75 mu m, and the screen residue is less than 1%.
4. The aerated concrete of claim 1, wherein: the fly ash is ash particles discharged in the coal burning process, and the residue of the fly ash after being sieved by 45 mu m is less than 20 percent.
5. The aerated concrete of claim 1, wherein: the lime is more than two-grade quicklime.
6. The aerated concrete of claim 1, wherein: the cement comprises one or more of ordinary portland cement, sulphoaluminate cement and ferro-aluminate cement; the gas former comprises one or more of animal and vegetable protein gas former, saponin gas former, fatty acid gas former, alkylbenzene sulfonate gas former, and aluminum powder paste; the foam stabilizer comprises one or more of cellulose ether, amide and polyvinyl alcohol; the water reducing agent comprises one or more of lignosulfonate water reducing agents, melamine water reducing agents, sulfamate water reducing agents and polycarboxylate water reducing agents.
7. A method of producing aerated concrete according to any one of claims 1 to 6, comprising the steps of:
(1) Preparing slurry: preparing a premix from the mineralized cementitious material, cement, fly ash, lime and dihydrate gypsum in a stirrer, uniformly mixing a water reducing agent and water, adding the mixture into the premix, and fully stirring to form a homogenized slurry; then adding a gas former and a foam stabilizer into the slurry and uniformly stirring to obtain slurry;
(2) Slurry injection molding: injecting the prepared slurry into a mold with the inner wall coated with mineral oil;
(3) Standing and maintaining: adjusting the temperature of the curing room, and curing the slurry and the die;
(4) Demolding and cutting: removing the mould, cutting off the bread heads of the mineralized aerated concrete blocks, and processing the shapes of the blocks as required;
(5) Pre-curing: curing the demolded and shaped building block;
(6) Mineralization maintenance: and transferring the pre-cured building block into a mineralization device under the normal temperature condition for mineralization and maintenance.
8. The method for preparing aerated concrete according to claim 7, wherein the method comprises the following steps: and (3) specifically, adjusting the temperature of the curing room, and curing the slurry and the die for 4-6h in an environment at 50-60 ℃.
9. The method for preparing aerated concrete according to claim 7, wherein the method comprises the following steps: the step (5) is to cure the demolded and shaped building block for 1 to 3 days under the conditions of 20 plus or minus 2 ℃ and 60 plus or minus 10 percent RH.
10. The method for producing an aerated concrete according to claim 7, wherein: the step (6) is specifically that the pre-cured building block is transferred into a mineralization device, and CO with the concentration of 40-60% is introduced at the speed of 5-10L/min after sealing 2 And (3) gas, and simultaneously adjusting the air pressure in the exhaust valve control device to be close to the normal pressure state, wherein the mineralization curing time is 6-8h.
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Application publication date: 20221227 |