CN112062531B - High-strength aerated concrete and preparation method thereof - Google Patents
High-strength aerated concrete and preparation method thereof Download PDFInfo
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- CN112062531B CN112062531B CN202010980892.1A CN202010980892A CN112062531B CN 112062531 B CN112062531 B CN 112062531B CN 202010980892 A CN202010980892 A CN 202010980892A CN 112062531 B CN112062531 B CN 112062531B
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- 239000004567 concrete Substances 0.000 title claims abstract description 78
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 72
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 60
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims abstract description 46
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 38
- 239000010440 gypsum Substances 0.000 claims abstract description 38
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 25
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 25
- 239000004310 lactic acid Substances 0.000 claims abstract description 23
- 235000014655 lactic acid Nutrition 0.000 claims abstract description 23
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 21
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 20
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 20
- 239000002253 acid Substances 0.000 claims abstract description 20
- 239000004568 cement Substances 0.000 claims abstract description 20
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 20
- 239000004571 lime Substances 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 17
- XYRAEZLPSATLHH-UHFFFAOYSA-N trisodium methoxy(trioxido)silane Chemical compound [Na+].[Na+].[Na+].CO[Si]([O-])([O-])[O-] XYRAEZLPSATLHH-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 239000003623 enhancer Substances 0.000 claims abstract description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 62
- 238000003756 stirring Methods 0.000 claims description 52
- 239000002002 slurry Substances 0.000 claims description 41
- 235000012239 silicon dioxide Nutrition 0.000 claims description 24
- 239000005543 nano-size silicon particle Substances 0.000 claims description 21
- 239000000126 substance Substances 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 16
- 238000005520 cutting process Methods 0.000 claims description 10
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims description 9
- 150000004683 dihydrates Chemical class 0.000 claims description 9
- 230000009467 reduction Effects 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 229920006395 saturated elastomer Polymers 0.000 claims description 7
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 6
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 6
- 229910052744 lithium Inorganic materials 0.000 claims description 6
- 239000011777 magnesium Substances 0.000 claims description 6
- 229910052749 magnesium Inorganic materials 0.000 claims description 6
- 239000011591 potassium Substances 0.000 claims description 6
- 229910052700 potassium Inorganic materials 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 239000011734 sodium Substances 0.000 claims description 6
- 229910052708 sodium Inorganic materials 0.000 claims description 6
- 229940104869 fluorosilicate Drugs 0.000 abstract description 10
- 239000000203 mixture Substances 0.000 description 25
- 230000000052 comparative effect Effects 0.000 description 12
- 239000004576 sand Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 239000010881 fly ash Substances 0.000 description 7
- 230000000630 rising effect Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 239000011148 porous material Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 239000012744 reinforcing agent Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- MCSXGCZMEPXKIW-UHFFFAOYSA-N 3-hydroxy-4-[(4-methyl-2-nitrophenyl)diazenyl]-N-(3-nitrophenyl)naphthalene-2-carboxamide Chemical compound Cc1ccc(N=Nc2c(O)c(cc3ccccc23)C(=O)Nc2cccc(c2)[N+]([O-])=O)c(c1)[N+]([O-])=O MCSXGCZMEPXKIW-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 150000001450 anions Chemical group 0.000 description 1
- 239000012237 artificial material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000011019 hematite Substances 0.000 description 1
- 229910052595 hematite Inorganic materials 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910001387 inorganic aluminate Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920001290 polyvinyl ester Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 239000002699 waste material Substances 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
- C04B28/141—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 containing dihydrated gypsum before the final hardening step, e.g. forming a dihydrated gypsum product followed by a de- and rehydration step
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
-
- 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
- C04B28/142—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 containing synthetic or waste calcium sulfate cements
- C04B28/143—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 containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being phosphogypsum
-
- 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
- C04B2111/00008—Obtaining or using nanotechnology related 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
Abstract
The invention discloses high-strength aerated concrete and a preparation method thereof. The high-strength aerated concrete comprises the following raw materials, by weight, 40-60 parts of modified red sandstone, 15-23 parts of cement, 13-19 parts of lime, 1-7 parts of gypsum, 0.1-0.5 part of aluminum powder, 0.5-2 parts of sodium hydroxide, 0.3-0.9 part of polycarboxylic acid water reducer and 70-80 parts of water. The modified red sandstone is prepared by reacting lactic acid and a reinforcer prepared by mixing natural red sandstone, polyvinyl alcohol, fluorosilicate and sodium methylsilicate. The natural red sandstone is modified by the polyvinyl alcohol, the enhancer and the lactic acid, so that the problems that the red sandstone is easy to soften after absorbing water and the strength of concrete is reduced can be effectively solved. The aerated concrete prepared by the invention has the characteristics of high compressive strength and low dry density.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to high-strength aerated concrete and a preparation method thereof.
Background
The aerated concrete is an artificial material with a porous structure, has the advantages of light weight, heat preservation, sound insulation, earthquake resistance, fire resistance and the like, and is a wall material which saves soil, wastes and energy. Statistics show that about 600 aerated concrete production enterprises are built in China, the total production capacity exceeds 5000 ten thousand cubic meters, and the aerated concrete production enterprises develop into a main wall material. The aerated concrete produced at present mainly adopts two raw materials of cement-lime-sand and cement-lime-fly ash. River sand and fly ash are main siliceous raw materials for producing sand aerated concrete, the reserves of available river sand are continuously reduced, and the problem of serious resource shortage can be even encountered in the next decades; the fly ash is gradually a resource, and the weather resistance and the volume stability of the fly ash aerated concrete are poor. It is very important to find new raw materials with sufficient reserves and low price.
The red sandstone is formed by weathering and disintegrating sedimentary rocks such as mudstone, sandy mudstone, sandstone, argillaceous or shale, and the appearance of the red sandstone is red, deep red or brown. The red sandstone resources are widely distributed in the areas of Hubei, Hunan and the like of China, and only lakesThe distribution quantity in south areas is as high as 40000km3In the field of road engineering, when the technical conditions do not meet the requirement of applying the red sandstone as a roadbed filler, the red sandstone needs to be remotely transported, discarded and piled in a place, so that the construction cost is high, and the environment can be polluted. In addition, research on the solid phase reaction of the red sandstone at high temperature to produce high-temperature sintered bricks or ceramic materials and the like has the advantages of high energy consumption, environmental pollution caused by emission and low market share.
Because the silicon content in the red sandstone reaches more than 70 percent and the iron content reaches more than 1 percent, the red sandstone mainly exists in the form of quartz, feldspar and hematite. The calcium material has high silicon content and aluminum content, and can react with the calcium material under the autoclaved condition and the alkali environment. Therefore, the red sandstone can be used as a siliceous material to replace river sand or fly ash to prepare the aerated concrete.
At present, the patent of replacing river sand with red sandstone to prepare aerated concrete is less, and the patent document of application number ' CN201510223176.8 ' red sandstone aerated concrete and preparation method thereof ' discloses a technical scheme for preparing aerated concrete by completely replacing river sand with red sandstone, so that red sandstone resources are reasonably utilized, but the compressive strength of the prepared aerated concrete only reaches 2.81-2.98 Mpa; the compressive strength is not ideal, and the prepared concrete has low compressive strength mainly because the red sandstone has low quartz content and is easy to soften after absorbing water.
Disclosure of Invention
The invention aims to provide high-strength aerated concrete and a preparation method thereof, and aims to solve the problems in the background art.
In order to solve the technical problems, the invention provides the following technical scheme: the high-strength aerated concrete comprises, by weight, 40-60 parts of modified red sandstone, 15-23 parts of cement, 13-19 parts of lime, 1-7 parts of gypsum, 0.1-0.5 part of aluminum powder, 0.5-2 parts of sodium hydroxide, 0.3-0.9 part of a polycarboxylic acid water reducer and 70-80 parts of water.
Further, the method comprises the following steps of; the modified red sandstone is mainly prepared from natural red sandstone, polyvinyl alcohol, nano silicon dioxide, a reinforcer and lactic acid.
Further: the enhancer is prepared by mixing fluosilicate and sodium methylsilicate.
Further, the method comprises the following steps of; the fluosilicate is any one or more of sodium fluosilicate, magnesium fluosilicate, potassium fluosilicate and lithium fluosilicate.
Further, the method comprises the following steps of; the mass ratio of the red sandstone to the nano silicon dioxide is 50: 1.
Further, the method comprises the following steps of; the gypsum is any one of natural dihydrate gypsum and phosphogypsum.
A preparation method of high-strength aerated concrete comprises the following steps;
(1) preparing modified red sandstone;
(2) preparing concrete slurry;
(3) and preparing a finished product of the high-strength aerated concrete.
Further: the preparation method of the high-strength aerated concrete comprises the following steps;
(1) preparing modified red sandstone: dissolving fluosilicate in water, adding sodium methyl silicate, and stirring to obtain an enhancer; crushing the red sandstone, adding nano silicon dioxide, and uniformly stirring; adding a reinforcer solution, stirring, standing until the surface of the red sandstone is saturated, and drying to obtain a substance A;
dissolving polyvinyl alcohol in water, and heating; dropwise adding concentrated sulfuric acid solution, stirring uniformly, and dropwise adding lactic acid; reacting, and cooling to room temperature to obtain a solution B; spraying a solution B on the surface of the substance A until the surface of the substance A is coated with water, thereby obtaining modified red sandstone;
in the scheme, lactic acid reacts with polyvinyl alcohol, and ester-based anion groups are introduced to a polyvinyl alcohol molecular chain, so that the solubility and the dispersibility of the polyvinyl alcohol are improved, and the polyvinyl alcohol can be quickly dissolved on the surface of the red sandstone to form a bonding protective film. In addition, lactic acid is weakly acidic, so that pH in a reaction environment is reduced, silicon-oxygen bonds and aluminum-oxygen bonds on the surface of the red sandstone are more easily broken, and SiO is dissolved4 4-、AlO4 5-Thereby increasing the reactivity of the red sandstone.
The red sandstone is disintegrated due to long-term weathering, and the surface and the interior of the red sandstone have more pores; according to the scheme, the nano silicon dioxide powder is added to physically fill the pores of the natural red sandstone; the physical filling of the pores can increase the silica content of the red sandstone and improve the hardness of the red sandstone, but because the nano-silica powder is in a discrete state, part of the nano-silica can fall off from the pores when the concrete is prepared, and the single physical filling effect is not ideal. According to the scheme, fluosilicate and sodium methyl silicate are combined to form an enhancer; infiltrating natural red sandstone filled with nano silicon dioxide by using a reinforcer, wherein fluorosilicate in the reinforcer and hydroxyl on the surfaces of red sandstone and nano silicon dioxide molecules are subjected to dehydration condensation reaction to form a bonding material, so that the problem that nano silicon dioxide powder falls off due to dispersion is solved; and simultaneously, the sodium methyl silicate further penetrates into the pores in the bonding material to fill the residual small amount of pores to form a stable structure. And finally, infiltrating the red sandstone with a polyethanol solution, wherein the polyethanol solution can be quickly bonded and coated on the surface of the red sandstone to form a protective film, and the stable structure of the red sandstone is coated to achieve the purpose of reinforcement.
(2) Preparing slurry: sequentially adding lime, cement, gypsum and a polycarboxylic acid water reducing agent into the mixture, mixing, adding the modified red sandstone prepared in the step (1), water and sodium hydroxide, and stirring to obtain slurry; heating, adding aluminum powder, and stirring to obtain concrete slurry;
(3) pouring the slurry into a mold, and maintaining; after curing, demolding and cutting into building blocks; and (5) performing autoclaved curing and demoulding to obtain the high-strength aerated concrete finished product.
Further: the preparation method of the high-strength aerated concrete comprises the following steps;
(1) preparing modified red sandstone: dissolving fluosilicate in water, adding sodium methyl silicate, and stirring to obtain an enhancer; crushing the red sandstone to continuous grade particles with the particle size of 0.1-0.5 mu m, adding nano silicon dioxide, and uniformly stirring; adding a reinforcer solution, stirring, standing for 1-2 hours until the surface of the red sandstone is saturated, and drying to obtain a substance A;
dissolving polyvinyl alcohol in water, and heating to 130-145 ℃; dropwise adding concentrated sulfuric acid solution, stirring uniformly, and dropwise adding lactic acid; reacting for 15-20 min, and cooling to room temperature to obtain a solution B;
spraying a solution B on the surface of the substance A until the surface of the substance A is coated with water, thereby obtaining modified red sandstone;
(2) preparing slurry: sequentially adding and mixing lime, cement, gypsum and a polycarboxylic acid water reducing agent, stirring for 25-50 s, adding the modified red sandstone prepared in the step (1), water and sodium hydroxide, and stirring for 25-50 s to obtain slurry; heating to 50-60 ℃, adding aluminum powder, and stirring for 25-50 s to prepare concrete slurry;
(3) pouring the slurry into a mold, and curing for 3-7 h at the temperature of 45-55 ℃; after curing, demolding and cutting into building blocks; and (3) carrying out autoclaved curing, wherein the steam pressure is 0.8-2.0 MPa, the temperature is 180-210 ℃, the temperature rise time is 1-3 h, the constant temperature time is 4-8 h, the temperature reduction time is 2-3 h, and demoulding is carried out to obtain the high-strength aerated concrete finished product.
Further: in the step (1), the weight ratio of the fluosilicate to the water is 1: 10.
compared with the prior art, the invention has the following beneficial effects: the method utilizes polyvinyl alcohol, nano silicon dioxide, a reinforcer and lactic acid to carry out multi-step treatment on the natural red sandstone, and solves the problem of low strength caused by easy softening of the natural red sandstone due to water absorption and low content of silicon dioxide; the modified red sandstone has higher strength, and the aerated concrete prepared from the modified red sandstone has higher compressive strength. In addition, the red sandstone is used for replacing the traditional siliceous materials such as river sand or fly ash to prepare the aerated concrete, so that the reasonable utilization of discarded resources is realized, the problem of shortage of river sand and fly ash resources is solved, and the ecological environment-friendly requirement is met.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The high-strength aerated concrete comprises the following raw materials, by weight, 40 parts of modified red sandstone, 15 parts of cement, 13 parts of lime, 1 part of gypsum, 0.1 part of aluminum powder, 0.5 part of sodium hydroxide, 0.3 part of a polycarboxylic acid water reducing agent and 70 parts of water.
The modified red sandstone is mainly prepared from natural red sandstone, polyvinyl alcohol, nano silicon dioxide, a reinforcer and lactic acid.
The enhancer is prepared by mixing fluosilicate and sodium methylsilicate.
The fluosilicate is any one or more of sodium fluosilicate, magnesium fluosilicate, potassium fluosilicate and lithium fluosilicate.
The mass ratio of the red sandstone to the nano silicon dioxide is 50: 1.
The gypsum is any one of natural dihydrate gypsum and phosphogypsum.
A preparation method of high-strength aerated concrete comprises the following steps;
(1) preparing modified red sandstone: dissolving fluorosilicate in water, wherein the weight ratio of the fluorosilicate to the water is 1: 10; adding sodium methyl silicate, and stirring to obtain a reinforcer; crushing the red sandstone to continuous grade particles with the particle size of 0.1-0.5 mu m, adding nano silicon dioxide, and uniformly stirring; adding a reinforcer solution, stirring, standing for 1h until the surface of the red sandstone is saturated, and drying to obtain a substance A;
dissolving polyvinyl alcohol in water, and heating to 130 ℃; dropwise adding concentrated sulfuric acid solution, stirring uniformly, and dropwise adding lactic acid; reacting for 15min, and cooling to room temperature to obtain a solution B; spraying a solution B on the surface of the substance A until the surface of the substance A is coated with water, thereby obtaining modified red sandstone;
(2) preparing slurry: sequentially adding lime, cement, gypsum and a polycarboxylic acid water reducing agent into the mixture, mixing the mixture for 25s, adding the modified red sandstone prepared in the step (1), water and sodium hydroxide into the mixture, and stirring the mixture for 25s to obtain slurry; heating to 50 ℃, adding aluminum powder, and stirring for 25s to prepare concrete slurry;
(3) pouring the slurry into a mold, and curing for 3 hours at the temperature of 45 ℃; after curing, demolding and cutting into building blocks; and (3) carrying out autoclaved curing, wherein the steam pressure is 0.8MPa, the temperature is 180 ℃, the temperature rising time is 1h, the constant temperature time is 4h, the temperature reduction time is 2h, and demoulding is carried out to obtain the high-strength aerated concrete finished product.
Example 2
The high-strength aerated concrete comprises the following raw materials, by weight, 53 parts of modified red sandstone, 18 parts of cement, 16 parts of lime, 5 parts of gypsum, 0.4 part of aluminum powder, 1.2 parts of sodium hydroxide, 0.5 part of a polycarboxylic acid water reducing agent and 73 parts of water.
The modified red sandstone is mainly prepared from natural red sandstone, polyvinyl alcohol, nano silicon dioxide, a reinforcer and lactic acid.
The enhancer is prepared by mixing fluosilicate and sodium methylsilicate.
The fluosilicate is any one or more of sodium fluosilicate, magnesium fluosilicate, potassium fluosilicate and lithium fluosilicate.
The mass ratio of the red sandstone to the nano silicon dioxide is 50: 1.
The gypsum is any one of natural dihydrate gypsum and phosphogypsum.
A preparation method of high-strength aerated concrete comprises the following steps;
(1) preparing modified red sandstone: dissolving fluorosilicate in water, wherein the weight ratio of the fluorosilicate to the water is 1: 10; adding sodium methyl silicate, and stirring to obtain a reinforcer; crushing the red sandstone to continuous grade particles with the particle size of 0.1-0.5 mu m, adding nano silicon dioxide, and uniformly stirring; adding a reinforcer solution, stirring, standing for 1.5h until the surface of the red sandstone is saturated, and drying to obtain a substance A;
dissolving polyvinyl alcohol in water, and heating to 137 ℃; dropwise adding concentrated sulfuric acid solution, stirring uniformly, and dropwise adding lactic acid; reacting for 17min, and cooling to room temperature to obtain a solution B; spraying a solution B on the surface of the substance A until the surface of the substance A is coated with water, thereby obtaining modified red sandstone;
(2) preparing slurry: sequentially adding lime, cement, gypsum and a polycarboxylic acid water reducing agent into the mixture, mixing the mixture for 37 seconds, adding the modified red sandstone prepared in the step (1), water and sodium hydroxide into the mixture, and stirring the mixture for 32 seconds to obtain slurry; heating to 53 ℃, adding aluminum powder, and stirring for 37s to prepare concrete slurry;
(3) pouring the slurry into a mold, and curing for 5 hours at the temperature of 51 ℃; after curing, demolding and cutting into building blocks; and (3) carrying out autoclaved curing, wherein the steam pressure is 1.5MPa, the temperature is 195 ℃, the temperature rising time is 2h, the constant temperature time is 6h, the temperature reduction time is 2.5h, and demoulding is carried out to obtain the high-strength aerated concrete finished product.
Example 3
The high-strength aerated concrete comprises the following raw materials, by weight, 60 parts of modified red sandstone, 23 parts of cement, 19 parts of lime, 7 parts of gypsum, 0.5 part of aluminum powder, 2 parts of sodium hydroxide, 0.9 part of a polycarboxylic acid water reducing agent and 80 parts of water.
The modified red sandstone is mainly prepared from natural red sandstone, polyvinyl alcohol, nano silicon dioxide, a reinforcer and lactic acid.
The enhancer is prepared by mixing fluosilicate and sodium methylsilicate.
The fluosilicate is any one or more of sodium fluosilicate, magnesium fluosilicate, potassium fluosilicate and lithium fluosilicate.
The mass ratio of the red sandstone to the nano silicon dioxide is 50: 1.
The gypsum is any one of natural dihydrate gypsum and phosphogypsum.
A preparation method of high-strength aerated concrete comprises the following steps;
(1) preparing modified red sandstone: dissolving fluorosilicate in water, wherein the weight ratio of the fluorosilicate to the water is 1: 10; adding sodium methyl silicate, and stirring to obtain a reinforcer; crushing the red sandstone to continuous grade particles with the particle size of 0.1-0.5 mu m, adding nano silicon dioxide, and uniformly stirring; adding a reinforcer solution, stirring, standing for 2 hours until the surface of the red sandstone is saturated, and drying to obtain a substance A;
dissolving polyvinyl alcohol in water, and heating to 145 ℃; dropwise adding concentrated sulfuric acid solution, stirring uniformly, and dropwise adding lactic acid; reacting for 20min, and cooling to room temperature to obtain a solution B; spraying a solution B on the surface of the substance A until the surface of the substance A is coated with water, thereby obtaining modified red sandstone;
(2) preparing slurry: sequentially adding lime, cement, gypsum and a polycarboxylic acid water reducing agent into the mixture, mixing the mixture for 50s, adding the modified red sandstone prepared in the step (1), water and sodium hydroxide into the mixture, and stirring the mixture for 50s to obtain slurry; heating to 60 ℃, adding aluminum powder, and stirring for 50s to prepare concrete slurry;
(3) pouring the slurry into a mold, and curing for 7 hours at the temperature of 55 ℃; after curing, demolding and cutting into building blocks; and (3) carrying out autoclaved curing, wherein the steam pressure is 2.0MPa, the temperature is 210 ℃, the temperature rising time is 3h, the constant temperature time is 8h, the temperature reduction time is 3h, and demoulding is carried out to obtain the high-strength aerated concrete finished product.
Comparative example 1
The high-strength aerated concrete comprises the following raw materials, by weight, 60 parts of modified red sandstone, 23 parts of cement, 19 parts of lime, 7 parts of gypsum, 0.5 part of aluminum powder, 2 parts of sodium hydroxide, 0.9 part of a polycarboxylic acid water reducing agent and 80 parts of water.
The modified red sandstone is mainly prepared from natural red sandstone, polyvinyl alcohol, nano silicon dioxide and lactic acid.
The mass ratio of the red sandstone to the nano silicon dioxide is 50: 1.
The gypsum is any one of natural dihydrate gypsum and phosphogypsum.
A preparation method of high-strength aerated concrete comprises the following steps;
(1) preparing modified red sandstone: crushing the red sandstone to continuous grade particles with the particle size of 0.1-0.5 mu m, adding nano silicon dioxide, and uniformly stirring; obtaining a substance A;
dissolving polyvinyl alcohol in water, and heating to 145 ℃; dropwise adding concentrated sulfuric acid solution, stirring uniformly, and dropwise adding lactic acid; reacting for 20min, and cooling to room temperature to obtain a solution B; spraying a solution B on the surface of the substance A until the surface of the substance A is coated with water, thereby obtaining modified red sandstone;
(2) preparing slurry: sequentially adding lime, cement, gypsum and a polycarboxylic acid water reducing agent into the mixture, mixing the mixture for 50s, adding the modified red sandstone prepared in the step (1), water and sodium hydroxide into the mixture, and stirring the mixture for 50s to obtain slurry; heating to 60 ℃, adding aluminum powder, and stirring for 50s to prepare concrete slurry;
(3) pouring the slurry into a mold, and curing for 7 hours at the temperature of 55 ℃; after curing, demolding and cutting into building blocks; and (3) carrying out autoclaved curing, wherein the steam pressure is 2.0MPa, the temperature is 210 ℃, the temperature rising time is 3h, the constant temperature time is 8h, the temperature reduction time is 3h, and demoulding is carried out to obtain the high-strength aerated concrete finished product.
Comparative example 2
The high-strength aerated concrete comprises the following raw materials, by weight, 60 parts of modified red sandstone, 23 parts of cement, 19 parts of lime, 7 parts of gypsum, 0.5 part of aluminum powder, 2 parts of sodium hydroxide, 0.9 part of a polycarboxylic acid water reducing agent and 80 parts of water.
The modified red sandstone is mainly prepared from natural red sandstone, polyvinyl alcohol and lactic acid.
The gypsum is any one of natural dihydrate gypsum and phosphogypsum.
A preparation method of high-strength aerated concrete comprises the following steps;
(1) preparing modified red sandstone: crushing the red sandstone to continuous grade particles with the particle size of 0.1-0.5 mu m, dissolving polyvinyl alcohol in water, and heating to 145 ℃; dropwise adding concentrated sulfuric acid solution, stirring uniformly, and dropwise adding lactic acid; reacting for 20min, and cooling to room temperature to obtain a solution A; spraying the solution A on the surface of the red sandstone until the surface of the red sandstone is coated with water, thereby obtaining the modified red sandstone;
(2) preparing slurry: sequentially adding lime, cement, gypsum and a polycarboxylic acid water reducing agent into the mixture, mixing the mixture for 50s, adding the modified red sandstone prepared in the step (1), water and sodium hydroxide into the mixture, and stirring the mixture for 50s to obtain slurry; heating to 60 ℃, adding aluminum powder, and stirring for 50s to prepare concrete slurry;
(3) pouring the slurry into a mold, and curing for 7 hours at the temperature of 55 ℃; after curing, demolding and cutting into building blocks; and (3) carrying out autoclaved curing, wherein the steam pressure is 2.0MPa, the temperature is 210 ℃, the temperature rising time is 3h, the constant temperature time is 8h, the temperature reduction time is 3h, and demoulding is carried out to obtain the high-strength aerated concrete finished product.
Comparative example 3
The high-strength aerated concrete comprises the following raw materials, by weight, 60 parts of modified red sandstone, 23 parts of cement, 19 parts of lime, 7 parts of gypsum, 0.5 part of aluminum powder, 2 parts of sodium hydroxide, 0.9 part of a polycarboxylic acid water reducing agent and 80 parts of water.
The modified red sandstone is mainly prepared from natural red sandstone and a reinforcing agent.
The enhancer is prepared by mixing fluosilicate and sodium methylsilicate.
The fluosilicate is any one or more of sodium fluosilicate, magnesium fluosilicate, potassium fluosilicate and lithium fluosilicate.
The gypsum is any one of natural dihydrate gypsum and phosphogypsum.
A preparation method of high-strength aerated concrete comprises the following steps;
(1) preparing modified red sandstone: dissolving fluorosilicate in water, wherein the weight ratio of the fluorosilicate to the water is 1: 10; adding sodium methyl silicate, and stirring to obtain a reinforcer; crushing the red sandstone into continuous-grade particles with the particle size of 0.1-0.5 mu m; adding a reinforcer solution, stirring, standing for 2 hours until the surface of the red sandstone is saturated, and drying to obtain modified red sandstone;
(2) preparing slurry: sequentially adding lime, cement, gypsum and a polycarboxylic acid water reducing agent into the mixture, mixing the mixture for 50s, adding the modified red sandstone prepared in the step (1), water and sodium hydroxide into the mixture, and stirring the mixture for 50s to obtain slurry; heating to 60 ℃, adding aluminum powder, and stirring for 50s to prepare concrete slurry;
(3) pouring the slurry into a mold, and curing for 7 hours at the temperature of 55 ℃; after curing, demolding and cutting into building blocks; and (3) carrying out autoclaved curing, wherein the steam pressure is 2.0MPa, the temperature is 210 ℃, the temperature rising time is 3h, the constant temperature time is 8h, the temperature reduction time is 3h, and demoulding is carried out to obtain the high-strength aerated concrete finished product.
Comparative example 4
The high-strength aerated concrete comprises the following raw materials, by weight, 60 parts of red sandstone, 23 parts of cement, 19 parts of lime, 7 parts of gypsum, 0.5 part of aluminum powder, 2 parts of sodium hydroxide, 0.9 part of a polycarboxylic acid water reducing agent and 80 parts of water.
The gypsum is any one of natural dihydrate gypsum and phosphogypsum.
A preparation method of high-strength aerated concrete comprises the following steps;
(1) preparing slurry: sequentially adding lime, cement, gypsum and a polycarboxylic acid water reducing agent, mixing, stirring for 50s, adding red sandstone, water and sodium hydroxide, and stirring for 50s to obtain slurry; heating to 60 ℃, adding aluminum powder, and stirring for 50s to prepare concrete slurry;
(2) pouring the slurry into a mold, and curing for 7 hours at the temperature of 55 ℃; after curing, demolding and cutting into building blocks; and (3) carrying out autoclaved curing, wherein the steam pressure is 2.0MPa, the temperature is 210 ℃, the temperature rising time is 3h, the constant temperature time is 8h, the temperature reduction time is 3h, and demoulding is carried out to obtain the high-strength aerated concrete finished product.
Experimental comparison and analysis
Examples 1 to 3 are the technical scheme;
in comparative example 1, the modified red sandstone is prepared from natural red sandstone, polyvinyl alcohol, nano-silica and lactic acid, and the rest is the same as in example 3;
in comparative example 2, the modified red sandstone was prepared from natural red sandstone, polyvinyl alcohol, and lactic acid, and the rest was the same as in example 3;
in the comparative example 3, the modified red sandstone is prepared from natural red sandstone and a reinforcing agent, and the rest contents are the same as those in the example 3;
in comparative example 4, the modified red sandstone was replaced with red sandstone, and the rest of the contents were the same as in example 3.
Testing the strength of the aerated concrete according to the requirements of GB/T11969-2008 autoclaved aerated concrete performance test method, and the test results are shown in Table 1;
| group of | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 |
| Compressive strength MPa | 8.7 | 8.7 | 8.9 | 4.95 | 4.36 | 4.08 | 2.14 |
| Dry density kg/m3 | 555.7 | 556.5 | 556.9 | 619.5 | 619.5 | 621.0 | 623.5 |
TABLE 1
As can be seen from the data in table 1, the compressive strength of the aerated concrete prepared in examples 1 to 3 reaches 8.7Mpa and above, and is greater than that of concrete prepared from polyvinyl alcohol and lactic acid modified natural red sandstone only and concrete prepared from reinforcer modified red sandstone only; the compressive strength of the concrete prepared in the embodiments 1-3 is higher than that of the concrete prepared by using the red sandstone to replace the modified red sandstone; therefore, the aerated concrete prepared by the technical scheme has the characteristics of low density and high strength.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A high strength aerated concrete is characterized in that; the high-strength aerated concrete comprises the following raw materials, by weight, 40-60 parts of modified red sandstone, 15-23 parts of cement, 13-19 parts of lime, 1-7 parts of gypsum, 0.1-0.5 part of aluminum powder, 0.5-2 parts of sodium hydroxide, 0.3-0.9 part of polycarboxylic acid water reducer and 70-80 parts of water;
the modified red sandstone is mainly prepared from natural red sandstone, polyvinyl alcohol, nano silicon dioxide, a reinforcer and lactic acid;
the enhancer is prepared by mixing fluosilicate and sodium methylsilicate;
the mass ratio of the natural red sandstone to the nano-silica is 50: 1.
2. The high-strength aerated concrete according to claim 1, wherein: the fluosilicate is any one or more of sodium fluosilicate, magnesium fluosilicate, potassium fluosilicate and lithium fluosilicate.
3. The high-strength aerated concrete according to claim 1, wherein: the gypsum is any one of natural dihydrate gypsum and phosphogypsum.
4. A high strength aerated concrete according to claim 1, wherein; the preparation method comprises the following steps;
(1) preparing modified red sandstone: dissolving fluosilicate in water, adding sodium methyl silicate, and stirring to obtain an enhancer; crushing the red sandstone to continuous grade particles with the particle size of 0.1-0.5 mu m, adding nano silicon dioxide, and uniformly stirring; adding a reinforcer solution, stirring, standing for 1-2 hours until the surface of the red sandstone is saturated, and drying to obtain a substance A;
dissolving polyvinyl alcohol in water, and heating to 130-145 ℃; dropwise adding concentrated sulfuric acid solution, stirring uniformly, and dropwise adding lactic acid; reacting for 15-20 min, and cooling to room temperature to obtain a solution B;
spraying a solution B on the surface of the substance A until the surface of the substance A is coated with water, thereby obtaining modified red sandstone;
(2) preparing slurry: sequentially adding and mixing lime, cement, gypsum and a polycarboxylic acid water reducing agent, stirring for 25-50 s, adding the modified red sandstone prepared in the step (1), water and sodium hydroxide, and stirring for 25-50 s to obtain slurry; heating to 50-60 ℃, adding aluminum powder, and stirring for 25-50 s to prepare concrete slurry;
(3) pouring the slurry into a mold, and curing for 3-7 h at the temperature of 45-55 ℃; after curing, demolding and cutting into building blocks; and (3) carrying out autoclaved curing, wherein the steam pressure is 0.8-2.0 MPa, the temperature is 180-210 ℃, the temperature rise time is 1-3 h, the constant temperature time is 4-8 h, the temperature reduction time is 2-3 h, and demoulding is carried out to obtain the high-strength aerated concrete finished product.
5. A high strength aerated concrete according to claim 4, wherein; in the step (1), the weight ratio of the fluosilicate to the water is 1: 10.
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| CN103922652A (en) * | 2014-03-31 | 2014-07-16 | 桂林理工大学 | Method of preparing aerated concrete by utilizing water-quenched manganese slag |
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| CN104829261A (en) * | 2015-05-05 | 2015-08-12 | 湖北省建筑工程质量监督检验测试中心 | Red sandstone aerated concrete and preparation method thereof |
| CN104987119A (en) * | 2015-06-30 | 2015-10-21 | 江苏中技新型建材有限公司 | Production process for low-cost autolaved aerated concrete blocks |
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| CN103922652A (en) * | 2014-03-31 | 2014-07-16 | 桂林理工大学 | Method of preparing aerated concrete by utilizing water-quenched manganese slag |
| CN103964889A (en) * | 2014-04-18 | 2014-08-06 | 东南大学 | Aerated concrete prepared from coal ash-nanosilicon dioxide-silica fume as main siliceous material |
| CN104829261A (en) * | 2015-05-05 | 2015-08-12 | 湖北省建筑工程质量监督检验测试中心 | Red sandstone aerated concrete and preparation method thereof |
| CN104987119A (en) * | 2015-06-30 | 2015-10-21 | 江苏中技新型建材有限公司 | Production process for low-cost autolaved aerated concrete blocks |
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