CN113999039A - In-situ whisker reinforced autoclaved aerated concrete prepared from gasified slag and preparation method thereof - Google Patents
In-situ whisker reinforced autoclaved aerated concrete prepared from gasified slag and preparation method thereof Download PDFInfo
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- CN113999039A CN113999039A CN202111270008.6A CN202111270008A CN113999039A CN 113999039 A CN113999039 A CN 113999039A CN 202111270008 A CN202111270008 A CN 202111270008A CN 113999039 A CN113999039 A CN 113999039A
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- 239000002893 slag Substances 0.000 title claims abstract description 83
- 239000004567 concrete Substances 0.000 title claims abstract description 54
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000006004 Quartz sand Substances 0.000 claims abstract description 25
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000003245 coal Substances 0.000 claims abstract description 23
- 238000002309 gasification Methods 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 19
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 19
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 19
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 19
- 239000001110 calcium chloride Substances 0.000 claims abstract description 19
- 229910001628 calcium chloride Inorganic materials 0.000 claims abstract description 19
- 239000004568 cement Substances 0.000 claims abstract description 19
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 19
- 239000010440 gypsum Substances 0.000 claims abstract description 19
- 239000004571 lime Substances 0.000 claims abstract description 19
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 19
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 19
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 18
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 17
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 7
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 39
- 238000000227 grinding Methods 0.000 claims description 34
- 239000002002 slurry Substances 0.000 claims description 27
- 238000002156 mixing Methods 0.000 claims description 25
- 238000005520 cutting process Methods 0.000 claims description 17
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 12
- 239000004005 microsphere Substances 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 238000004537 pulping Methods 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 8
- 238000001238 wet grinding Methods 0.000 claims description 8
- 239000002440 industrial waste Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 3
- 230000000171 quenching effect Effects 0.000 claims description 3
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 abstract description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 7
- 230000009467 reduction Effects 0.000 abstract description 5
- 238000004064 recycling Methods 0.000 abstract description 4
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000002194 synthesizing effect Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000005188 flotation Methods 0.000 abstract description 2
- 238000001027 hydrothermal synthesis Methods 0.000 abstract description 2
- 239000002910 solid waste Substances 0.000 abstract description 2
- VEFXTGTZJOWDOF-UHFFFAOYSA-N benzene;hydrate Chemical compound O.C1=CC=CC=C1 VEFXTGTZJOWDOF-UHFFFAOYSA-N 0.000 abstract 1
- 238000005261 decarburization Methods 0.000 abstract 1
- 239000006072 paste Substances 0.000 abstract 1
- 229910052782 aluminium Inorganic materials 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000004094 surface-active agent Substances 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 150000001804 chlorine Chemical class 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- MKTRXTLKNXLULX-UHFFFAOYSA-P pentacalcium;dioxido(oxo)silane;hydron;tetrahydrate Chemical compound [H+].[H+].O.O.O.O.[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O MKTRXTLKNXLULX-UHFFFAOYSA-P 0.000 description 3
- 239000002243 precursor Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 235000008429 bread Nutrition 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007676 flexural strength test Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000004137 mechanical activation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000011056 performance test Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses in-situ whisker reinforced autoclaved aerated concrete prepared from gasified slag and a preparation method thereof. The in-situ whisker reinforced autoclaved aerated concrete comprises the following raw materials: the material comprises coal gasification slag, quartz sand tailings, silica fume, cement, lime, gypsum, aluminum powder paste, calcium chloride, sodium sulfate, sodium dodecyl benzene sulfonate and water. The method adopts the gasified slag as the raw material, realizes the recycling of solid waste to prepare the autoclaved aerated concrete, and achieves the purposes of energy conservation, emission reduction and environmental protection; the method for synthesizing the calcium sulfate whiskers by in-situ hydrothermal method is adopted, so that the breaking strength of the aerated concrete is improved, and the phenomena of edge and corner missing are reduced; and the flotation decarburization technology is adopted, so that the influence of carbon residue in the gasified slag on the autoclaved aerated concrete is reduced, and the utilization rate of the gasified slag is improved.
Description
Technical Field
The invention belongs to the field of autoclaved aerated concrete, and particularly relates to in-situ whisker reinforced autoclaved aerated concrete prepared from gasified slag and a preparation method thereof.
Background
The gasified slag is industrial slag formed by water-cooling and quenching coal after a gasification process at high temperature and high pressure, and is melted at high temperature and then water-cooled and quenched to form glass-state granular material. The gas slag is produced in huge quantity every year, and about 8 million tons of gas slag are produced in China in 2020, which seriously occupies land and pollutes soil and underground water. Therefore, the research on the reduction and resource utilization technology of the gasified slag is the key point for realizing the reduction of the gasified slag treatment cost of the coal gasification enterprises and achieving both economic benefit and environmental protection benefit.
However, the excessive carbon residue in the gasified slag is not favorable for the gasified slag to be used as a building material raw material, because the porous carbon grain structure increases the water demand, and the increase of the water demand will cause the drying shrinkage of the product to be large, thereby affecting the strength and the durability thereof. Patent CN108275895A discloses a method for preparing a cementing material by suspension roasting coal gasification slag, which comprises the step of roasting coal gasification slag in a sintering furnace at the temperature of 700-. The methods solve the use problem of the gasified slag to a certain extent, but have the defects of not wide application range and higher energy consumption. The autoclaved aerated concrete is prepared from the gasified residues, unburned carbon is collected to the surface of the aerated concrete through chlorine salt and surfactant flotation, and the aerated concrete is cut and removed, so that the utilization rate of the gasified residues is improved.
Disclosure of Invention
The invention aims to provide in-situ whisker reinforced autoclaved aerated concrete prepared from gasified slag and a preparation method thereof, which are used for realizing energy conservation, emission reduction and environmental protection; the method for synthesizing the calcium sulfate whiskers by in-situ hydrothermal method is adopted, so that the toughness of the aerated concrete is improved, and the breakage rate is reduced; the chlorine salt and the surfactant are used as carbon particle trapping agents, so that the utilization rate of the gasified slag in the autoclaved aerated concrete is improved.
In order to solve the problems of the prior art, the invention adopts the technical scheme that:
an in-situ whisker reinforced autoclaved aerated concrete prepared from gasified slag comprises the following raw materials in parts by weight: 18-25 parts of gasified slag, 32-40 parts of quartz sand tailings, 3-5 parts of silica fume, 15-18 parts of cement, 8-10 parts of lime, 2-3 parts of gypsum, 0.08-0.12 part of aluminum powder paste, 0.13-0.15 part of calcium chloride, 0.18-0.20 part of sodium sulfate, 0.015-0.020 part of sodium dodecyl benzene sulfonate and 42-45 parts of water. The in-situ whisker is prepared from calcium chloride, sodium sulfate and sodium dodecyl benzene sulfonate under the hydrothermal condition of preparing the autoclaved aerated concrete.
Preferably, the gasified slag is industrial waste slag formed by water-cooling and quenching coal after a gasification process at high temperature and high pressure, and SiO is obtained2The content is more than or equal to 40 percent.
The preparation method of the in-situ whisker reinforced autoclaved aerated concrete prepared from the gasified slag comprises the following steps:
step 1, adding a grinding aid into coal gasification slag, grinding for 10-15 minutes by using microspheres, and grinding by using microspheres, wherein the ratio of balls to materials is 30-50: 1, the specific surface area of the coal gasification slag powder is more than or equal to 400m2And/kg, adding water into the quartz sand tailings, wet-milling the quartz sand tailings, mixing the quartz sand tailings with the water, and pulping, wherein the grades of steel balls selected for the microsphere grinding are respectively 4-6mm, 6-8mm and 8-10mm, and the steel balls are 2-3: 1.5-1: 1;
step 2, adding lime, cement, gypsum, silica fume, calcium chloride, sodium sulfate and sodium dodecyl benzene sulfonate into the slurry pool, mixing and stirring for 3-5 minutes, adding aluminum powder paste into the slurry pool, mixing for 40-50 seconds, and pouring the slurry into a mold;
and 3, curing at low temperature, demolding, cutting to obtain a green body, curing the green body at the temperature of 190 ℃ and under the pressure of 1.15-1.30 MPa for 6-7 hours, and cooling to obtain a finished product.
Preferably, the grinding aid in the step (1) is triethanolamine and glycerol in a weight ratio of 1: 1, and the doping amount is 0.4-0.6% of the weight of the gasified slag.
Preferably, the cutting in the step (3) refers to cutting the sample after demolding, and the cutting position is 3-6mm above the formed blank. It should be noted that the demoulded blank is placed in the mould in the same way, and the upper part is 3-6mm from top to bottom.
The invention principle is as follows:
the method uses the gasified slag as a part of raw materials to replace quartz sand tailings to prepare the wall material, the recycling of the gasified slag is greatly limited due to the high carbon content of the gasified slag, the method realizes the recycling of the gasified slag to prepare the autoclaved aerated concrete by combining mechanical activation and chemical activation, and the application range is wide. By adopting the method for synthesizing the calcium sulfate whiskers in situ, spindle-shaped calcium sulfate whiskers are formed through high-temperature steam curing, and the spindle-shaped calcium sulfate whiskers are connected with tobermorite, so that the strength and toughness of the product are improved, and the damage caused by thermal stress is effectively reduced. Meanwhile, the added chlorine salt and the surfactant also play a role of a trapping agent, improve the floatability of the carbon granules, effectively trap the carbon granules, float on the surface of the aerated concrete, and reduce the adverse effect of the carbon granules on the autoclaved aerated concrete by cutting bread heads through green bodies.
Has the advantages that:
(1) according to the whisker reinforced autoclaved aerated concrete, the wall material is prepared by taking the gasified slag as a part of raw material to replace quartz sand tailings, so that the autoclaved aerated concrete is prepared by recycling solid wastes, and the purposes of energy conservation, emission reduction and environment protection are achieved;
(2) the method adopts a calcium sulfate whisker precursor synthesized by calcium chloride and a sodium sulfate solution under normal pressure, generates tobermorite which is a main strength structure of autoclaved aerated concrete in a high-temperature and high-pressure steam-curing stage, and simultaneously, the solubility of the calcium sulfate whisker precursor is increased under a hydrothermal condition so as to enter a liquid phase and form a certain supersaturation degree, and then the calcium sulfate whisker precursor is recrystallized to form the spindle-shaped calcium sulfate whisker. The spindle-shaped calcium sulfate whiskers and the tobermorite are mutually connected, so that the strength and the toughness of the product are improved, and the damage caused by thermal stress is effectively reduced;
(3) the added chloride and the surfactant also play a role of a trapping agent, improve the floatability of the carbon granules, effectively trap the carbon granules, float on the surface of the aerated concrete, and reduce the adverse effect of the carbon granules on the autoclaved aerated concrete by cutting off the upper carbon-rich layer through the green body;
(4) the wall material prepared by the invention meets the index requirements of GB/T15762-.
Drawings
FIG. 1 is an XRD spectrum of gasified slag;
FIG. 2 is an XRD (X-ray diffraction) pattern of an autoclaved aerated concrete hydration product prepared by the invention.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the embodiment as follows:
example 1
An in-situ whisker reinforced autoclaved aerated concrete prepared from gasified slag comprises the following raw materials in parts by weight: 18 parts of gasified slag, 35 parts of quartz sand tailings, 3 parts of silica fume, 15 parts of cement, 8 parts of lime, 2 parts of gypsum, 0.12 part of aluminum paste, 0.13 part of calcium chloride, 0.18 part of sodium sulfate, 0.015 part of sodium dodecyl benzene sulfonate and 42 parts of water.
The preparation method of the in-situ whisker reinforced autoclaved aerated concrete prepared from the gasified slag comprises the following steps:
(1) adding a grinding aid into the coal gasification slag, and grinding for 10 minutes by using microspheres to ensure that the specific surface area of the coal gasification slag powder is more than or equal to 400m2Adding water to wet-grind and mix with quartz sand tailings for pulping; wherein the grinding aid is triethanolamine and glycerol, and the weight ratio of the grinding aid to the grinding aid is 1: 1, the doping amount is 0.4 percent of the weight of the gasified slag;
(2) adding lime, cement, gypsum, silica fume, calcium chloride, sodium sulfate and sodium dodecyl benzene sulfonate into the slurry pool, mixing and stirring for 3 minutes, adding aluminum powder paste into the slurry pool, mixing for 40 seconds, and pouring the slurry into a mold;
(3) maintaining at low temperature (40-50 deg.C), demolding, and cutting to obtain green body; and curing the green body for 6 hours at 170 ℃ under the condition of 1.15MPa, and cooling to obtain a finished product.
Example 2
The in-situ whisker reinforced autoclaved aerated concrete prepared from the gasified slag comprises the following raw materials in parts by weight: 20 parts of gasified slag, 32 parts of quartz sand tailings, 4 parts of silica fume, 18 parts of cement, 9 parts of lime, 2 parts of gypsum, 0.10 part of aluminum paste, 0.15 part of calcium chloride, 0.19 part of sodium sulfate, 0.016 part of sodium dodecyl benzene sulfonate and 45 parts of water.
The preparation method of the in-situ whisker reinforced autoclaved aerated concrete prepared from the gasified slag comprises the following steps:
(1) adding a grinding aid into the coal gasification slag, grinding by using microspheres (the steel ball grading is respectively 4-6mm, 6-8mm and 8-10mm, and the weight ratio is 3: 1.5: 1), and grinding for 12 minutes to ensure that the specific surface area of the coal gasification slag powder is more than or equal to 400m2And/kg, adding water to the quartz sand tailings, wet-grinding, mixing and pulping, wherein the grinding aid is triethanolamine and glycerol, and the weight ratio of the triethanolamine to the glycerol is 1: 1, the doping amount is 0.5 percent of the weight of the gasified slag;
(2) adding lime, cement, gypsum, silica fume, calcium chloride, sodium sulfate and sodium dodecyl benzene sulfonate into the slurry pool, mixing and stirring for 4 minutes, adding aluminum powder paste into the slurry pool, mixing for 45 seconds, and pouring the slurry into a mold;
(3) curing at low temperature (40-50 ℃), demoulding and cutting to obtain a green body. And curing the green body for 7 hours at 180 ℃ under the pressure of 1.20MPa, and cooling to obtain a finished product.
Example 3
The in-situ whisker reinforced autoclaved aerated concrete prepared from the gasified slag comprises the following raw materials in parts by weight: 25 parts of gasified slag, 40 parts of quartz sand tailings, 5 parts of silica fume, 16 parts of cement, 10 parts of lime, 3 parts of gypsum, 0.08 part of aluminum paste, 0.14 part of calcium chloride, 0.20 part of sodium sulfate, 0.018 part of sodium dodecyl benzene sulfonate and 44 parts of water.
The preparation method of the in-situ whisker reinforced autoclaved aerated concrete prepared from the gasified slag comprises the following steps:
(1) adding a grinding aid into the coal gasification slag, and grinding by using microspheres (the steel ball grading is respectively 4-6mm, 6-8mm and 8-10mm, and the weight ratio is 3:1: 1) grinding for 15 minutes to ensure that the specific surface area of the coal gasification slag powder is more than or equal to 400m2And/kg, adding water to the quartz sand tailings, wet-grinding, mixing and pulping, wherein the grinding aid is triethanolamine and glycerol, and the weight ratio of the triethanolamine to the glycerol is 1: 1, the doping amount is 0.6 percent of the weight of the gasified slag;
(2) adding lime, cement, gypsum, silica fume, calcium chloride, sodium sulfate and sodium dodecyl benzene sulfonate into a slurry pool, mixing and stirring for 5 minutes, adding aluminum powder paste into the slurry pool, mixing for 50 seconds, and pouring the slurry into a mold;
(3) curing at low temperature (40-50 ℃), demoulding and cutting to obtain a green body. And curing the green body for 6 hours at 190 ℃ under the condition of 1.30MPa, and cooling to obtain a finished product.
Example 4
The in-situ whisker reinforced autoclaved aerated concrete prepared from the gasified slag comprises the following raw materials in parts by weight: 25 parts of gasified slag, 38 parts of quartz sand tailings, 3 parts of silica fume, 17 parts of cement, 10 parts of lime, 2 parts of gypsum, 0.09 part of aluminum paste, 0.14 part of calcium chloride, 0.18 part of sodium sulfate, 0.017 part of sodium dodecyl benzene sulfonate and 43 parts of water.
The preparation method of the in-situ whisker reinforced autoclaved aerated concrete prepared from the gasified slag comprises the following steps:
(1) adding a grinding aid into the coal gasification slag, grinding by using microspheres (the steel ball grading is respectively 4-6mm, 6-8mm and 8-10mm, and the weight ratio is 2.5: 1.2: 1), and grinding for 12 minutes to ensure that the specific surface area of the coal gasification slag powder is more than or equal to 400m2And/kg, adding water to the quartz sand tailings, wet-grinding, mixing and pulping, wherein the grinding aid is triethanolamine and glycerol, and the weight ratio of the triethanolamine to the glycerol is 1: 1, the doping amount is 0.4 percent of the weight of the gasified slag;
(2) adding lime, cement, gypsum, silica fume, calcium chloride, sodium sulfate and sodium dodecyl benzene sulfonate into the slurry pool, mixing and stirring for 3 minutes, adding aluminum powder paste into the slurry pool, mixing for 45 seconds, and pouring the slurry into a mold;
(3) curing at low temperature (40-50 ℃), demoulding and cutting to obtain a green body. And curing the green body for 7 hours at 175 ℃ under the pressure of 1.25MPa, and cooling to obtain a finished product.
Example 5
The in-situ whisker reinforced autoclaved aerated concrete prepared from the gasified slag comprises the following raw materials in parts by weight: 24 parts of gasified slag, 36 parts of quartz sand tailings, 4 parts of silica fume, 15 parts of cement, 9 parts of lime, 3 parts of gypsum, 0.11 part of gas former, 0.13 part of calcium chloride, 0.19 part of sodium sulfate, 0.020 part of sodium dodecyl benzene sulfonate and 42 parts of water.
The preparation method of the in-situ whisker reinforced autoclaved aerated concrete prepared from the gasified slag comprises the following steps:
(1) adding a grinding aid into the coal gasification slag, grinding by using microspheres (the steel ball grading is respectively 4-6mm, 6-8mm and 8-10mm, and the weight ratio is 2.2: 1: 1), and grinding for 10 minutes to ensure that the specific surface area of the coal gasification slag powder is more than or equal to 400m2And/kg, adding water to the quartz sand tailings, wet-grinding, mixing and pulping, wherein the grinding aid is triethanolamine and glycerol, and the weight ratio of the triethanolamine to the glycerol is 1: 1, the doping amount is 0.5 percent of the weight of the gasified slag;
(2) adding lime, cement, gypsum, silica fume, calcium chloride, sodium sulfate and sodium dodecyl benzene sulfonate into the slurry pool, mixing and stirring for 4 minutes, adding aluminum powder paste into the slurry pool, mixing for 48 seconds, and pouring the slurry into a mold;
(3) curing at low temperature (40-50 ℃), demoulding and cutting to obtain a green body. And curing the green body for 6 hours at 180 ℃ under the condition of 1.15MPa, and cooling to obtain a finished product.
Example 6
The in-situ whisker reinforced autoclaved aerated concrete prepared from the gasified slag comprises the following raw materials in parts by weight: 21 parts of gasified slag, 34 parts of quartz sand tailings, 5 parts of silica fume, 18 parts of cement, 8 parts of lime, 2 parts of gypsum, 0.12 part of aluminum paste, 0.15 part of calcium chloride, 0.20 part of sodium sulfate, 0.019 part of sodium dodecyl benzene sulfonate and 45 parts of water.
The preparation method of the in-situ whisker reinforced autoclaved aerated concrete prepared from the gasified slag comprises the following steps:
(1) adding grinding aid into coal gasification slag, and adopting microsphere powderGrinding (steel ball grading is 4-6mm, 6-8mm and 8-10mm respectively, and the weight ratio is 2: 1.5: 1), and grinding for 15 minutes to make the specific surface area of the coal gasification slag powder be greater than or equal to 400m2And/kg, adding water to the quartz sand tailings, wet-grinding, mixing and pulping, wherein the grinding aid is triethanolamine and glycerol, and the weight ratio of the triethanolamine to the glycerol is 1: 1, the doping amount is 0.6 percent of the weight of the gasified slag;
(2) adding lime, cement, gypsum, silica fume, calcium chloride, sodium sulfate and sodium dodecyl benzene sulfonate into the slurry pool, mixing and stirring for 5 minutes, adding aluminum powder paste into the slurry pool, mixing for 40 seconds, and pouring the slurry into a mold;
(3) and (5) curing at low temperature, demolding and cutting to obtain a green body. And curing the green body at 175 ℃ under the condition of 1.20MPa for 7 hours, and cooling to obtain a finished product.
Comparative example
The raw materials of the embodiment comprise the following components in parts by weight: 60 parts of quartz sand tailings, 8 parts of lime, 15 parts of cement, 3 parts of gypsum and 0.10 part of aluminum paste.
(1) Adding water into quartz sand tailings for wet grinding and pulping;
(2) adding lime, cement and gypsum into the slurry pool, mixing and stirring for 5 minutes, adding aluminum powder paste into the slurry pool, mixing for 45 seconds, and pouring the slurry into a mold;
(3) curing at low temperature (40-50 ℃), demoulding, cutting to obtain a green body, curing the green body at 190 ℃ under 1.20MPa for 8 hours, and cooling to obtain a finished product.
Performance detection
The autoclaved aerated concrete prepared in the above examples 1 to 6 and comparative example was subjected to dry density, compressive strength and flexural strength tests with reference to GBT 11969-2008 "method for testing autoclaved aerated concrete Performance", and the results obtained are shown in the following Table 1.
TABLE 1 tables of Properties of autoclaved aerated concrete prepared in examples 1-6 and comparative examples
And (4) analyzing a performance test result:
as can be seen from Table 1, the whisker reinforced autoclaved aerated concrete prepared by the preparation method meets the requirements of national products, and the indexes of the compressive strength and the flexural strength of the whisker reinforced autoclaved aerated concrete are superior to those of the autoclaved aerated concrete prepared by the method in the comparative example, the dry density of the autoclaved aerated concrete prepared in the examples 1-6 is B05 grade, the compressive strength of the whisker reinforced autoclaved aerated concrete is higher than that of the superior product A3.5 to 3.5MPa, the average value of the compressive strength can reach 3.9MPa at most, the flexural strength is superior to that of the comparative example and can reach 2.3MPa at most, and the whisker reinforced autoclaved aerated concrete prepared by the method disclosed by the invention is high in flexural strength and can effectively improve the phenomena of edge and corner chipping of aerated concrete.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and any simple modifications or equivalent substitutions of the technical solutions that can be obviously obtained by those skilled in the art within the technical scope of the present invention are within the scope of the present invention.
Claims (5)
1. The in-situ whisker reinforced autoclaved aerated concrete prepared from the gasified slag is characterized by comprising the following raw materials in parts by weight: 18-25 parts of gasified slag, 32-40 parts of quartz sand tailings, 3-5 parts of silica fume, 15-18 parts of cement, 8-10 parts of lime, 2-3 parts of gypsum, 0.08-0.12 part of aluminum powder paste, 0.13-0.15 part of calcium chloride, 0.18-0.20 part of sodium sulfate, 0.015-0.020 part of sodium dodecyl benzene sulfonate and 42-45 parts of water.
2. The in-situ whisker reinforced autoclaved aerated concrete prepared from gasified slag according to claim 1, which is characterized in that: the gasified slag is industrial waste slag formed by water-cooling and quenching coal after a gasification process at high temperature and high pressure, and SiO of the industrial waste slag2The content is more than or equal to 40 percent.
3. The preparation method of the in-situ whisker reinforced autoclaved aerated concrete prepared from the gasified slag according to claim 1, which is characterized by comprising the following steps:
step 1, adding a grinding aid into coal gasification slag, grinding for 10-15 minutes by using microspheres, and grinding by using microspheres, wherein the ratio of balls to materials is 30-50: 1, the specific surface area of the coal gasification slag powder is more than or equal to 400m2And/kg, adding water into the quartz sand tailings, wet-milling the quartz sand tailings, mixing the quartz sand tailings with the water, and pulping, wherein the grades of steel balls selected for the microsphere grinding are respectively 4-6mm, 6-8mm and 8-10mm, and the steel balls are 2-3: 1.5-1: 1;
step 2, adding lime, cement, gypsum, silica fume, calcium chloride, sodium sulfate and sodium dodecyl benzene sulfonate into the slurry pool, mixing and stirring for 3-5 minutes, adding aluminum powder paste into the slurry pool, mixing for 40-50 seconds, and pouring the slurry into a mold;
and 3, curing at low temperature, demolding, cutting to obtain a green body, curing the green body at the temperature of 190 ℃ and under the pressure of 1.15-1.30 MPa for 6-7 hours, and cooling to obtain a finished product.
4. The method for preparing the in-situ whisker reinforced autoclaved aerated concrete prepared from the gasified slag according to claim 3, wherein the grinding aid in the step (1) is triethanolamine and glycerol in a weight ratio of 1: 1, and the doping amount is 0.4-0.6% of the weight of the gasified slag.
5. The method for preparing the in-situ whisker reinforced autoclaved aerated concrete prepared from the gasified slag according to claim 3, wherein the cutting in the step (3) is cutting the sample after demolding, and the cutting position is 3-6mm above the formed blank.
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