CN116553897B - Foam concrete and preparation method thereof - Google Patents
Foam concrete and preparation method thereof Download PDFInfo
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- CN116553897B CN116553897B CN202310334408.1A CN202310334408A CN116553897B CN 116553897 B CN116553897 B CN 116553897B CN 202310334408 A CN202310334408 A CN 202310334408A CN 116553897 B CN116553897 B CN 116553897B
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- 239000011381 foam concrete Substances 0.000 title claims abstract description 83
- 238000002360 preparation method Methods 0.000 title abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 80
- 239000000835 fiber Substances 0.000 claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 37
- 239000004088 foaming agent Substances 0.000 claims abstract description 29
- 239000002893 slag Substances 0.000 claims abstract description 23
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 21
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 16
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000003546 flue gas Substances 0.000 claims abstract description 16
- 239000004567 concrete Substances 0.000 claims abstract description 8
- 239000002002 slurry Substances 0.000 claims description 28
- 241000196324 Embryophyta Species 0.000 claims description 26
- 239000006260 foam Substances 0.000 claims description 17
- 238000005187 foaming Methods 0.000 claims description 14
- 239000010440 gypsum Substances 0.000 claims description 14
- 229910052602 gypsum Inorganic materials 0.000 claims description 14
- 238000001354 calcination Methods 0.000 claims description 12
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 11
- 239000011707 mineral Substances 0.000 claims description 11
- 239000011575 calcium Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 239000010456 wollastonite Substances 0.000 claims description 10
- 229910052882 wollastonite Inorganic materials 0.000 claims description 10
- 239000004814 polyurethane Substances 0.000 claims description 8
- 229920002635 polyurethane Polymers 0.000 claims description 8
- 244000198134 Agave sisalana Species 0.000 claims description 7
- 244000060011 Cocos nucifera Species 0.000 claims description 7
- 235000013162 Cocos nucifera Nutrition 0.000 claims description 7
- 239000013078 crystal Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 239000000428 dust Substances 0.000 claims description 4
- 239000010459 dolomite Substances 0.000 claims description 3
- 229910000514 dolomite Inorganic materials 0.000 claims description 3
- 239000000779 smoke Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- 239000004568 cement Substances 0.000 abstract description 26
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 16
- 238000012360 testing method Methods 0.000 description 10
- 235000010755 mineral Nutrition 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 239000000395 magnesium oxide Substances 0.000 description 8
- 235000012245 magnesium oxide Nutrition 0.000 description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 238000003763 carbonization Methods 0.000 description 4
- 238000003837 high-temperature calcination Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000002667 nucleating agent Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000003381 stabilizer Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229920000297 Rayon Polymers 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000007863 gel particle Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 239000002964 rayon Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000010025 steaming Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 1
- 239000010428 baryte Substances 0.000 description 1
- 229910052601 baryte Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009422 external insulation Methods 0.000 description 1
- 239000011210 fiber-reinforced concrete Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- -1 fluorgypsum Chemical compound 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000000643 oven drying Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/0427—Dry 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
-
- 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
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
- C04B7/42—Active ingredients added before, or during, the burning process
-
- 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
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
- C04B7/42—Active ingredients added before, or during, the burning process
- C04B7/421—Inorganic materials
- C04B7/424—Oxides, Hydroxides
-
- 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
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/44—Burning; Melting
-
- 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
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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- 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
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- 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
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- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses foam concrete and a preparation method thereof, and belongs to the technical field of concrete materials, wherein the foam concrete consists of dry materials, water, a water reducing agent and a foaming agent; the dry material comprises 40-55 wt.% of high alite cementing material, 27-42 wt.% of dry carbide slag, 2-5 wt.% of light calcium carbonate, 1-3 wt.% of natural fiber and 10-15 wt.% of hardening accelerator. The early strength of cement can be greatly enhanced by adopting the high-Alisking cementing material; and the foam concrete is maintained by using the flue gas at the tail of the cement kiln, so that the heat in the flue gas is effectively utilized, and the emission of CO 2 in a cement plant is reduced.
Description
Technical Field
The invention belongs to the technical field of concrete materials, and particularly relates to foam concrete and a preparation method thereof.
Background
In recent years, foam concrete has been rapidly developed, and has become a widely used civil engineering material, and has many excellent properties such as small volume density, good thermal performance, excellent earthquake resistance, good sound insulation performance, and the like. The foam concrete can be used for heat preservation and insulation of building walls and roofs, mine backfilling engineering, foundation engineering, retaining wall engineering and environmental engineering. The external wall insulation board made of foam concrete has a series of excellent performances such as light weight, heat preservation, crack resistance and the like, is suitable for industrial and civil buildings, enhances the external wall external insulation fireproof performance and living condition of the building, saves energy and protects the environment.
The existing precast foam concrete production has the following three problems: firstly, the slurry is slowly coagulated and hardened, and the die is easy to collapse; secondly, the shrinkage is large, and the cracking is easy; and thirdly, the maintenance period is generally 7-28 days, and the period is long. The Chinese patent application 201410530304.9 discloses a high-strength heat-insulating foam concrete and a preparation method thereof, wherein the foam concrete is prepared by sulphoaluminate cement, so that the requirements of demoulding speed and production efficiency are met, but the sulphoaluminate cement is easy to carbonize and has the advantages of low later strength, large carbonization shrinkage and poor durability; chinese patent application 201710429087.8 discloses a sulfoaluminate cement foam concrete using carbon dioxide as foaming gas and a preparation method thereof, wherein the sulfoaluminate cement, mineral admixture, carbon dioxide foaming agent, foam stabilizer and water are adopted to prepare the foam concrete, and although the heat conductivity coefficient of CO 2 is lower than that of air, CO 2 in bubbles is easily absorbed by the sulfoaluminate cement to generate CaCO 3, so that the pore walls are loose and porous. In addition, a great deal of research has been conducted on reducing shrinkage of foam concrete using rayon, but rayon is expensive. In order to shorten the curing time of the foam concrete, the Chinese patent invention 202210895977.9 releases the foam concrete after the pre-curing, and the foam concrete is placed in a carbonization kettle with normal temperature and carbon dioxide partial pressure of 0.1-1.0 MPa for carbonization curing for 0.5-2 hours, so that a finished product is obtained, but the invention is difficult to realize industrialized production.
The invention provides foam concrete, which is prepared from high alite cementing material and dry carbide slag as cementing materials, light calcium carbonate as a foam stabilizer and a nucleating agent, polyurethane as a foaming agent and fibers as a shrinkage reducing agent. The invention provides a preparation method of foam concrete, which comprises the following steps: the foam concrete is maintained by using the flue gas of the cement kiln tail, so that the CO 2 emission of a cement plant can be obviously reduced, and the strength of the foam concrete is improved in a short time.
Disclosure of Invention
The invention aims to solve the technical problems that: a foam concrete and a preparation method thereof are provided to at least solve the technical problems of the above parts.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a foam concrete is composed of dry materials, water, a water reducing agent and a foaming agent;
the dry material comprises the following components in percentage by mass:
The water consumption is determined by the hollow cylinder fluidity of the foam concrete slurry of 180+/-20 mm;
the water reducing agent is powder, and the mixing amount is 0.8-1.2 per mill of the total dry material;
The foaming agent is polyurethane foaming agent;
the density of the foam concrete slurry is 2000-2100 kg/m 3.
Further, the high alite cementing material consists of 95% clinker and 5% gypsum, wherein the clinker comprises the following mineral components in percentage by mass:
Further, the clinker is formed by high-temperature calcination of calcareous materials (limestone and dolomite), siliceous materials (shale and siltstone), aluminum materials (fly ash and steel slag), mineralizer and seed crystals, the calcination temperature is 1450-1530 ℃, the calcination time is 20-90 min, and the high-alite cementing material with the specific surface area of 380-500 kg/m 2 is prepared by grinding the calcined particles and a proper amount of gypsum.
The mineralizer is one or more of phosphogypsum, fluorgypsum, manganese slag, barite, phosphorus slag, nickel slag and strontium slag.
The seed crystal adopts the cement clinker in the small-particle cement clinker with the patent number of CN 104926164B.
The range of the three-rate value of the clinker is as follows: KH 0.91-0.95; SM 2.4-3.2; IM 0.9-1.7.
Further, the components of the dry carbide slag are Ca (OH) 2, the fineness is 45-100 mu m, and the median diameter is 8-10 mu m.
Further, the light calcium carbonate is aragonite type calcium carbonate with fineness of 800 meshes, and the light calcium carbonate is used as a foam stabilizer and a nucleating agent.
Further, the natural fibers are composed of plant fibers and fibrous wollastonite according to a mass ratio of 5:1, wherein the plant fibers are one or two of coconut shell fibers and sisal fibers, the length of the plant fibers is 1-10 mm, and the length of the fibrous wollastonite is 20-200 mu m; the plant fiber is steamed for 8 to 12 hours under the water vapor condition of 180 ℃ and 1MPa, and then is taken out, washed and dried, and saccharification is removed; then, the ultraviolet lamp is adopted to irradiate for 8 to 12 hours, the microstructure of the plant fiber is changed, and the bonding force between the fiber and the matrix is increased.
Further, the mineral composition of the hardening accelerator is glassy C 12A7 and mixed gypsum.
A preparation method of foam concrete comprises the following steps:
Step 1, weighing raw materials of the aerated concrete according to a proportion;
step 2, adding the weighed dry materials and the water reducer into a stirrer to stir into a uniform mixed material;
Step 3, adding a foaming agent and water required by foaming in a foaming machine in proportion to generate foam;
step 4, adding water into the mixed material until the consistency of the slurry is 160-200 mm;
Step 5, calculating the adding volume V Bubble of foam according to the requirement of the volume weight M of the foam concrete and a formula V Bubble ＝1-M/ρ Material , adding the foam into the slurry, and stirring for 3-4 min, wherein M is the volume weight of the foam concrete, and ρ Material is the density of the slurry;
Step 6, pouring the slurry into a mould, curing for 6-8 hours in the environment of 50 ℃, and cutting according to the specification requirements after demoulding;
and 7, curing the cut foam concrete by kiln tail smoke.
Further, the step 7 includes:
Step 71, placing the cut foam concrete in closed equipment and vacuumizing;
And 72, introducing the flue gas discharged from the dust collection of the kiln tail bag into the closed equipment, boosting the pressure to 1.0-2.0 MPa within 2 hours, opening a micro-opening exhaust valve on the sealing equipment, and ensuring the working pressure of the equipment to be 1.0-2.0 MPa while enabling the gas to flow, wherein the duration time is 12-24 hours.
And 73, slowly exhausting and cooling, and taking out the foam concrete.
Further, the temperature of the flue gas discharged from the kiln tail bag for dust collection is 40-70 ℃, and the concentration of CO 2 is 15-20%.
Compared with the prior art, the invention has the following beneficial effects:
(1) GB199 quick hardening Portland Cement for improving early strength of cement requires to improve the content of C 3 S, wherein the content of C 3 S in quick hardening Portland cement clinker is 50-60%, and the content of C 3 S is not too high, otherwise, calcination is difficult, and cement performance is reduced. The high alite cementing material adopted by the invention has the C 3 S content exceeding 64 percent, and can greatly enhance the early strength of cement.
(2) Because the content of C 3 S in the high-alite cementing material clinker is too high, the current industrial production is difficult to realize, and the invention realizes industrial sintering through the following three measures:
Firstly, dolomite is adopted to provide MgO as a solid solvent, so that the sintering temperature is reduced, and a large amount of C 3 S is formed. In view of stability, the MgO content in the general calcareous raw material is less than 3.0%, the MgO content in the raw material is obviously higher, so that a large amount of C 3 S is formed, a certain amount of periclase is formed at the same time, mgCO 3 is generated by redundant periclase in the carbonization maintenance process of foam concrete, the stability of products is not affected, and the high-alite cementing material prepared by the invention is suitable for carbonized maintenance products;
Secondly, a mineralizer is adopted to reduce the viscosity of the firing liquid phase, which is beneficial to the formation of C 3 S;
thirdly, seed crystal is adopted as a nucleating agent to promote the formation of C 3 S.
(3) The foam concrete slurry is prepared from carbide slag, is easy to thicken, can stabilize foam and prevent foam concrete from collapsing. Ca (OH) 2 in the carbide slag absorbs water in the slurry to form gel particles, and the gel particles are mutually bonded under the action of molecular force and gradually form a space network of a condensation structure. The smaller the carbide slag particles, the more colloidal particles are in an amount corresponding to the unit volume of Ca (OH) 2, and the more bonding points are formed in the agglomerated structure. When the cement is hydrated and a compact structure is not formed, the agglomeration structure formed by the Ca (OH) 2 colloid particles thickens the slurry to a certain extent, and stabilizes the foam.
(4) In order to improve the crack resistance of the foam concrete and reduce shrinkage, the invention adds low-cost plant fibers. Plant fibers are poor conductors of heat with a thermal conductivity of 0.03W/(m.k), whereas common man-made fibers have a thermal conductivity of more than 0.2W/(m.k). The plant fiber is used in the foam concrete, so that not only can the crack resistance of the foam concrete be improved, but also the effect of preventing heat transmission can be achieved.
(5) The plant fiber has the characteristic of insufficient long-term durability in the environment with the pH value more than 12, so that the strength and the crack resistance of the foam concrete are reduced in the service stage, which is a key technical problem of the plant fiber reinforced concrete in the industry at present. In order to solve the problems, the preparation method of the foam concrete provided by the invention adopts the flue gas at the tail of a cement kiln to maintain the foam concrete, and CO 2 in the flue gas can enable Ca (OH) 2 generated by hydration in a foam concrete matrix to react rapidly to generate CaCO 3, so that the content of alkaline Ca (OH) 2 is reduced, and the crack resistance of plant fibers is improved.
(6) The preparation method of the foam concrete provided by the invention has the advantages that the pre-curing time is 6-8 h, the kiln tail smoke high-pressure curing time is 12-24 h, the curing period of the foam concrete can be shortened, and the emission of CO 2 in a cement plant can be reduced. The process is added at the kiln tail of a cement plant, so that the production of the high-Alisking cement cementing material, the preparation and maintenance of foam concrete are integrated, and huge reform is brought to the industry.
Detailed Description
The present invention will be described in further detail below in order to make the objects, technical solutions and advantages of the present invention more apparent. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
A foam concrete is composed of dry materials, water, a water reducing agent and a foaming agent;
Wherein the dry material comprises the following components in percentage by mass:
40wt.% of high alite cementing material, 42wt.% of dry carbide slag, 5wt.% of light calcium carbonate, 3wt.% of natural fiber and 10wt.% of hardening accelerator;
the water reducing agent is powder, and the mixing amount is 1.2 per mill of the total amount of the dry materials;
The foaming agent is polyurethane foaming agent.
In this example, the high alite cementing material is composed of 95% clinker and 5% gypsum, the clinker comprises the following mineral components in percentage by mass: 70wt.% C 3S;10wt.％C2S;4wt.％C3A;14wt.％C4 AF;2wt.% MgO.
The clinker is formed by high-temperature calcination of a calcareous material, a siliceous material, an aluminum material, a mineralizer and seed crystals, wherein the calcination temperature is 1530 ℃ and the calcination time is 70min.
The specific surface area of the high alite cementing material is 400kg/m 2.
In this example, the dry carbide slag component is Ca (OH) 2, and the fineness is 45-100 μm.
In this embodiment, the light calcium carbonate is aragonite type calcium carbonate, and the fineness is 800 meshes.
In the embodiment, the natural fibers are composed of plant fibers and fibrous wollastonite according to a mass ratio of 5:1, wherein the plant fibers are coconut fibers, the length of the coconut fibers is 1-10 mm, and the length of the fibrous wollastonite is 20-200 mu m. The coconut shell fiber is steamed for 8 to 12 hours under the water vapor condition of 180 ℃ and 1MPa, and then is taken out, washed and dried, and saccharified; then, the ultraviolet lamp is adopted to irradiate for 8 to 12 hours, the microstructure of the fiber is changed, and the bonding force between the fiber and the matrix is increased.
In this example, the mineral composition of the hardening accelerator was 1:1 by mass of glassy C 12A7 and mixed gypsum.
In this embodiment, a method for preparing foam concrete includes the steps of:
Step 1, weighing raw materials of the aerated concrete according to a proportion;
step 2, adding the weighed dry materials and the water reducer into a stirrer to stir into a uniform mixed material;
Step3, adding a foaming agent and water required by foaming into a foaming machine in proportion, and producing a proper amount of foam according to a program specified by the foaming machine;
Step 4, adding water into the mixed material until the consistency of the slurry is 165mm, wherein the density of the slurry is 2100kg/m 3;
Step 5, preparing foam concrete with the target volume weight M of 600kg/M 3, adding 0.71M 3 foam into the slurry, and continuously stirring for 3min;
And 6, pouring the slurry into a die, curing for 4 hours at 50 ℃, and cutting according to specification requirements after demoulding.
Example 2
A foam concrete is composed of dry materials, water, a water reducing agent and a foaming agent;
Wherein the dry material comprises the following components in percentage by mass:
55wt.% of high alite cementing material, 27wt.% of dry carbide slag, 2wt.% of light calcium carbonate, 1wt.% of natural fiber and 15wt.% of hardening accelerator;
The water reducing agent is powder, and the mixing amount is 1.0 per mill of the total amount of the dry materials;
The foaming agent is polyurethane foaming agent.
In this example, the high alite cementing material is composed of 95% clinker and 5% gypsum, the clinker comprises the following mineral components in percentage by mass: 64wt.% C 3S;16wt.％C2S;7wt.％C3A;8wt.％C4 AF;5wt.% MgO.
The clinker is formed by high-temperature calcination of calcareous material, siliceous material, aluminum material, mineralizer and seed crystal, the calcination temperature is 1480 ℃ and the calcination time is 70min,
The specific surface area of the high alite cementing material is 450kg/m 2.
In this example, the dry carbide slag component is Ca (OH) 2, and the fineness is 45 μm to 100. Mu.m.
In this example, the light calcium carbonate is aragonite calcium carbonate with a fineness of 800 mesh.
In the embodiment, the natural fibers are composed of plant fibers and fibrous wollastonite according to a mass ratio of 5:1, wherein the plant fibers are sisal fibers, the length of the sisal fibers is 1-10 mm, and the length of the fibrous wollastonite is 20-200 mu m. Steaming sisal fiber for 8-12 hr at 180deg.C under 1MPa, taking out, cleaning, oven drying, and removing saccharification; then, the ultraviolet lamp is adopted to irradiate for 8 to 12 hours, the microstructure of the fiber is changed, and the bonding force between the fiber and the matrix is increased.
In this example, the mineral composition of the hardening accelerator was 1:1 by mass of glassy and mixed gypsum.
In this embodiment, a foam concrete and a method for preparing the same, comprising the steps of:
Step 1, weighing raw materials of the aerated concrete according to a proportion;
step 2, adding the weighed dry materials and the water reducer into a stirrer to stir into a uniform mixed material;
Step3, adding a foaming agent and water required by foaming into a foaming machine in proportion, and producing a proper amount of foam according to a program specified by the foaming machine;
step 4, adding water into the mixed material until the consistency of the slurry is 180mm and the density of the slurry is 2000kg/m 3;
Step 5, preparing foam concrete with the target volume weight M of 400kg/M 3, adding 0.8M 3 foam into the slurry, and continuously stirring for 3min;
and 6, pouring the slurry into a die, curing for 5 hours at 50 ℃, and cutting according to specification requirements after demoulding.
Example 3
A foam concrete is composed of dry materials, water, a water reducing agent and a foaming agent;
Wherein the dry material comprises the following components in percentage by mass:
50wt.% of high alite cementing material, 30wt.% of dry carbide slag, 4wt.% of light calcium carbonate, 2wt.% of natural fiber and 14wt.% of hardening accelerator;
The water reducing agent is powder, and the mixing amount is 0.8 per mill of the total amount of the dry materials;
The foaming agent is polyurethane foaming agent.
In this example, the high alite cement consists of 95% clinker and 4% gypsum, and comprises the following mineral components in percentage by mass: 68wt.% C 3S;12wt.％C2S;6wt.％C3A;10wt.％C4 AF;4wt.% MgO.
In this example, the clinker is formed by high-temperature calcination of calcareous material, siliceous material, aluminous material, mineralizer and seed crystal, the calcination temperature is 1450 ℃, the calcination time is 60min,
The specific surface area of the high alite cementing material is 500kg/m 2.
In this example, the dry carbide slag component is Ca (OH) 2, and the fineness is 45-100 μm.
In this embodiment, the light calcium carbonate is aragonite type calcium carbonate, and the fineness is 800 meshes.
In the embodiment, the natural fibers are composed of plant fibers and fibrous wollastonite according to a mass ratio of 5:1, wherein the plant fibers are coconut shell fibers and sisal fibers, the fiber length is 1-10 mm, and the fibrous wollastonite length is 20-200 mu m. Steaming coconut shell fiber and sisal fiber for 8-12 h under the water vapor condition of 180 ℃ and 1MPa, taking out, cleaning, drying and removing saccharification; then, the ultraviolet lamp is adopted to irradiate for 8 to 12 hours, the microstructure of the fiber is changed, and the bonding force between the fiber and the matrix is increased.
In this example, the mineral composition of the hardening accelerator was 1:1 by mass of glassy C 12A7 and mixed gypsum.
In this embodiment, a method for preparing foam concrete includes the steps of:
Step 1, weighing raw materials of the aerated concrete according to a proportion;
step 2, adding the weighed dry materials and the water reducer into a stirrer to stir into a uniform mixed material;
Step3, adding a foaming agent and water required by foaming into a foaming machine in proportion, and producing a proper amount of foam according to a program specified by the foaming machine;
Step 4, adding water into the mixed material until the consistency of the slurry is 173mm and the density of the slurry is 2100kg/m 3;
Step 5, preparing foam concrete with the target volume weight M of 800kg/M 3, adding 0.62M 3 foam into the slurry, and continuously stirring for 3min;
And 6, pouring the slurry into a die, curing for 6 hours at 50 ℃, and cutting according to specification requirements after demoulding.
Comparative example 1
A foam concrete is composed of dry materials, water, a water reducing agent and a foaming agent;
Wherein the dry material comprises the following components in percentage by mass:
the water reducing agent is powder, and the mixing amount is 1.2 per mill of the total amount of the dry materials;
The foaming agent is polyurethane foaming agent.
The other conditions and preparation methods of this comparative example were the same as in example 1.
Comparative example 2
A foam concrete is prepared from dry material, water reducer and foaming agent.
Wherein the dry material comprises the following components in percentage by mass:
the water reducing agent is powder, and the mixing amount is 1.2 per mill of the total amount of the dry materials;
The foaming agent is polyurethane foaming agent.
The other conditions and preparation methods of this comparative example were the same as in example 1.
After demoulding, the foam concrete prepared in the examples 1-3 and the comparative examples 1-2 is subjected to natural curing 28d and kiln tail flue gas curing, and the kiln tail flue gas curing conditions are as described in the step 7 of the invention. The properties after curing are shown in Table 1.
TABLE 1 physical Properties of foam concrete
Note that:
(1) The experimental methods of compressive strength and dry density of foam concrete are referred to the standard JG/T266-2011.
(2) A 40×40×160mm test piece with copper bars embedded at both ends was used to test the dry shrinkage properties (dry shrinkage value) of the foam concrete. Placing the cured test block in a constant temperature water tank at 20+/-2 ℃ and keeping the water surface higher than the test piece by 3cm, and taking out the test block after placing for 72 hours to measure the initial length of the test block; then the test is put under the environment of constant temperature (20+/-2) and constant humidity (43+/-3)%, the length of the test at the 90d age is measured, the reading is repeated for 3 times each time, and the test process reference standard GB/T11969-2008 autoclaved aerated concrete performance test method.
(3) The calculation formula of the carbon fixation rate is as follows: (kiln tail flue gas curing foam concrete dry density M1-natural curing 28d foam concrete dry density M2). Times.100%/natural curing 28d foam concrete dry density M2.
As shown in table 1, in examples 1 to 3, the compressive strength and dry density of the foam concrete cured by kiln tail gas were both higher than those of the foam concrete cured for 28 days naturally, the 90d dry shrinkage rate was significantly lower than that of the test piece cured by nature, and the carbon fixation rate was 39 to 43%, and as the foam concrete cured by kiln tail gas, ca (OH) 2 in cement and carbide slag absorbed CO 2 in gas to produce CaCO 3, resulting in an increase in dry density. Therefore, the foam concrete is maintained by using the flue gas of the cement kiln tail, so that the heat in the flue gas is effectively utilized, the CO 2 emission of a cement plant is reduced, and the shrinkage of the foam concrete can be reduced to a certain extent.
The p.i 52.5R cement of comparative example 1 consisted of 95% portland cement clinker and 5% gypsum, while the high alite cement of example 1 comprised 95% high strength clinker and 5% gypsum. Since the high alite binder C 3 S content of example 1 is higher than p.i 52.5R, both the compressive strength and dry density of example 1 are higher than comparative example 1.
In comparative example 2, the slag replaces carbide slag, and since the CaO content in the slag is lower than that of the carbide slag and the amount of CaCO 3 generated after kiln tail flue gas curing is less, the compressive strength is lower and the carbon fixation rate is lower.
Finally, it should be noted that: the above embodiments are merely preferred embodiments of the present invention for illustrating the technical solution of the present invention, but not limiting the scope of the present invention; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions; that is, even though the main design concept and spirit of the present invention is modified or finished in an insubstantial manner, the technical problem solved by the present invention is still consistent with the present invention, and all the technical problems are included in the protection scope of the present invention; in addition, the technical scheme of the invention is directly or indirectly applied to other related technical fields, and the technical scheme is included in the scope of the invention.
Claims (7)
1. The foam concrete is characterized by comprising dry materials, water, a water reducing agent and a foaming agent;
the dry material comprises the following components in percentage by mass:
The water consumption is determined by the hollow cylinder fluidity of the foam concrete slurry of 180+/-20 mm;
the water reducing agent is powder, and the mixing amount is 0.8-1.2 per mill of the total dry material;
The foaming agent is polyurethane foaming agent;
The density of the foam concrete slurry is 2000-2100 kg/m 3;
the components of the dry carbide slag are Ca (OH) 2, and the fineness is 45-100 mu m; the foam concrete is subjected to kiln tail flue gas maintenance;
The high alite cementing material consists of 95% clinker and 5% gypsum, wherein the clinker comprises the following mineral components in percentage by mass:
wherein, dolomite is adopted to provide MgO as a solid solvent;
The clinker is formed by calcining a calcareous material, a siliceous material, an aluminum material, a mineralizer and a seed crystal at a high temperature, wherein the calcining temperature is 1450-1530 ℃, the calcining time is 20-90 min, and the sintered particles and gypsum are ground to prepare the high-alite cementing material with the specific surface area of 380-500 kg/m 2.
2. The foam concrete according to claim 1, wherein the light calcium carbonate is aragonite calcium carbonate having a fineness of 800 mesh.
3. The foam concrete according to claim 1, wherein the natural fibers are composed of plant fibers and fibrous wollastonite in a mass ratio of 5:1, wherein the plant fibers are one or two of coconut fibers and sisal fibers, the plant fibers have a length of 1-10 mm, and the fibrous wollastonite has a length of 20-200 μm; the plant fiber is steamed for 8 to 12 hours under the water vapor condition of 180 ℃ and 1MPa, and then is taken out, washed and dried, and saccharification is removed; then, the ultraviolet lamp is adopted to irradiate for 8 to 12 hours, the microstructure of the plant fiber is changed, and the bonding force between the fiber and the matrix is increased.
4. A foam concrete according to claim 1, wherein the mineral composition of the hardening accelerator is glassy C 12A7 and mixed gypsum.
5. A method for preparing a foam concrete according to any one of claims 1 to 4, comprising the steps of:
Step 1, weighing raw materials of the aerated concrete according to a proportion;
step 2, adding the weighed dry materials and the water reducer into a stirrer to stir into a uniform mixed material;
Step 3, adding a foaming agent and water required by foaming in a foaming machine in proportion to generate foam;
step 4, adding water into the mixed material until the consistency of the slurry is 160-200 mm;
Step 5, calculating the adding volume V Bubble of foam according to the requirement of the volume weight M of the foam concrete and a formula V Bubble ＝1-M/ρ Material , adding the foam into the slurry, and stirring for 3-4 min, wherein M is the volume weight of the foam concrete, and ρ Material is the density of the slurry;
Step 6, pouring the slurry into a mould, curing for 6-8 hours in the environment of 50 ℃, and cutting according to the specification requirements after demoulding;
and 7, curing the cut foam concrete by kiln tail smoke.
6. The method for preparing foam concrete according to claim 5, wherein the step 7 comprises:
Step 71, placing the cut foam concrete in closed equipment and vacuumizing;
step 72, introducing the flue gas discharged from the dust collection of the kiln tail bag into the closed equipment, boosting the pressure to 1.0-2.0 MPa in 2 hours, opening a micro-opening exhaust valve on the sealing equipment, and ensuring the working pressure of the equipment to be 1.0-2.0 MPa while enabling the gas to flow, wherein the duration time is 12-24 hours;
And 73, slowly exhausting and cooling, and taking out the foam concrete.
7. The method for preparing foam concrete according to claim 6, wherein the temperature of flue gas discharged from the kiln tail bag for dust collection is 40-70 ℃ and the concentration of CO 2 is 15-20%.
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| CN104909644A (en) * | 2015-05-08 | 2015-09-16 | 盐城工学院 | Foamed cement concrete and preparation method thereof |
| CN104926164B (en) * | 2015-07-01 | 2017-12-26 | 嘉华特种水泥股份有限公司 | A kind of little particle clinker |
| CN106396574A (en) * | 2016-09-06 | 2017-02-15 | 清华大学建筑设计研究院有限公司 | Silicon-aluminum based lightweight concrete material and preparation method thereof |
| CN110698088B (en) * | 2019-11-10 | 2021-08-17 | 四川省宁南县白鹤滩水泥有限责任公司 | Retarded portland cement and preparation method thereof |
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| CN115784769A (en) * | 2022-08-02 | 2023-03-14 | 华润水泥技术研发有限公司 | Foam concrete based on high-activity calcium-based carbon absorption and preparation method thereof |
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