CN113004017B - High-strength aerated concrete - Google Patents
High-strength aerated concrete Download PDFInfo
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- CN113004017B CN113004017B CN202110385462.XA CN202110385462A CN113004017B CN 113004017 B CN113004017 B CN 113004017B CN 202110385462 A CN202110385462 A CN 202110385462A CN 113004017 B CN113004017 B CN 113004017B
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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
- 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
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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
- 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
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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
- 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
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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
- C04B2111/00008—Obtaining or using nanotechnology related 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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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
Abstract
The invention discloses high-strength aerated concrete. 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. Wherein the modified red sandstone is prepared by reacting a strengthening agent prepared by mixing natural red sandstone, polyvinyl alcohol, fluorosilicate and sodium methyl silicate with lactic acid. The natural red sandstone is modified by using polyvinyl alcohol, a reinforcing agent and lactic acid, so that the problem 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.
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 prevention and the like, and is a wall material with the advantages of saving soil, utilizing waste and saving energy. Statistics show that about 600 aerated concrete production enterprises are built nationwide, the total production capacity exceeds 5000 ten thousand cubic meters, and the aerated concrete production enterprises are developed into a main wall material. The main raw materials adopted in the production of aerated concrete at present are cement-lime-sand, cement-lime-fly ash. River sand and fly ash are main siliceous raw materials for producing sand aerated concrete, while the reserve of available river sand stone is continuously reduced, and the problem of serious resource deficiency can be even faced in the next decades; fly ash becomes a pretty resource gradually, and the fly ash aerated concrete has poor weather resistance and volume stability. 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, mud or shale, and the like, and has the appearance of red, deep red or brown. Red sandstone resources are widely distributed in areas such as Hubei province, hunan province and the like in China, and the distribution quantity of the areas only in Hunan province is up to 40000km 3 In the field of road engineering, when the technical conditions cannot meet the requirement of using red sandstone as roadbed filler, remote transportation discarding and ground searching stacking are needed, so that the engineering cost is high and the environment is possibly polluted. In addition, the red sandstone is used for producing high-temperature by solid-phase reaction at high temperatureThe products have huge energy consumption, environmental pollution emission and low market share, and are used for sintering bricks or ceramic materials.
The silicon content in the red sandstone is more than 70 percent, the iron content is more than 1 percent, and the red sandstone mainly exists in the form of quartz, feldspar and hematite. Wherein the silicon content and the aluminum content are higher, and the silicon-aluminum alloy can react with calcareous materials under autoclaved conditions and alkali environments. Therefore, the red sandstone can be used as siliceous material to replace river sand or fly ash to prepare the aerated concrete.
At present, the patent of preparing aerated concrete by using red sandstone to replace river sand is less, in the patent document of application number CN201510223176.8, which is a red sandstone aerated concrete and a preparation method thereof, the technical scheme of preparing the aerated concrete by using the red sandstone to completely replace the river sand is disclosed, 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 main factor is that the quartz content in the red sandstone is low, and the red sandstone is easy to soften after water absorption, so that the compressive strength of the prepared concrete is low.
Disclosure of Invention
The invention aims to provide high-strength aerated concrete and a preparation method thereof, so as to solve the problems in the background technology.
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 modified red sandstone is mainly prepared from natural red sandstone, polyvinyl alcohol, nano silicon dioxide, a reinforcing agent and lactic acid.
Further: the reinforcing agent is prepared by mixing fluorosilicate and sodium methyl silicate.
Further; the fluorosilicate is any one or more of sodium fluorosilicate, magnesium fluorosilicate, potassium fluorosilicate and lithium fluorosilicate.
Further; the mass ratio of the red sandstone to the nano silicon dioxide is 50:1.
Further; the gypsum is any one of natural dihydrate gypsum and phosphogypsum.
A preparation method of high-strength aerated concrete comprises the following steps of;
(1) Preparing modified red sandstone;
(2) Preparing concrete slurry;
(3) And preparing a high-strength aerated concrete finished product.
Further: the preparation method of the high-strength aerated concrete comprises the following steps of;
(1) Preparation of modified red sandstone: dissolving fluorosilicate in water, adding sodium methyl silicate, and stirring to obtain the reinforcing agent; crushing red sandstone, adding nano silicon dioxide, and uniformly stirring; adding the enhancer 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, uniformly stirring, and dropwise adding lactic acid; reacting, cooling to room temperature to obtain a solution B; spraying the solution B on the surface of the substance A until water hanging appears on the surface of the substance A to obtain modified red sandstone;
in the scheme, lactic acid reacts with polyvinyl alcohol, and ester group anionic groups are introduced to a polyvinyl alcohol molecular chain, so that the solubility and dispersibility of the polyvinyl alcohol are improved, and the polyvinyl alcohol can be rapidly dissolved on the surface of the red sandstone to form a bonding protective film. In addition, as lactic acid presents weak acidity, the pH in the reaction environment is reduced, so that the silicon oxygen bond and the aluminum oxygen bond on the surface of the red sandstone are easier to break, and SiO is dissolved out 4 4- 、AlO 4 5- Thereby increasing the reactivity of the red sandstone.
The red sandstone disintegrates due to long-term weathering, and the surface and the inside of the red sandstone have more pores; according to the scheme, nano silicon dioxide powder is added to physically fill the pores of natural red sandstone; 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 nano silica can fall off from the pores when the concrete is prepared, so that the independent physical filling effect is not ideal. The scheme combines fluorosilicate and sodium methyl silicate to form a strengthening agent; the natural red sandstone filled with the nano silicon dioxide is soaked by the reinforcing agent, at the moment, the fluorosilicate in the reinforcing agent, the red sandstone and the hydroxyl on the surfaces of nano silicon dioxide molecules undergo dehydration condensation reaction to form a binder, so that the problem of discrete shedding of nano silicon dioxide powder is solved; and meanwhile, the sodium methyl silicate further permeates into pores in the binder, and a small amount of residual pores are filled to form a stable structure. Finally, the red sandstone is soaked by the polyethylene glycol solution, the polyethylene glycol solution can be rapidly adhered and coated on the surface of the red sandstone to form a protective film, the red sandstone is firmly wrapped, the reinforcing purpose is achieved, and on the other hand, the protective film can prevent the red sandstone from absorbing water and avoid the problem that the red sandstone is softened due to water absorption.
(2) Preparing slurry: sequentially adding lime, cement, gypsum and a polycarboxylate water reducer, 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 mould and curing; after curing, demolding and cutting into a block body; and (5) performing autoclaved curing and demoulding to obtain a high-strength aerated concrete finished product.
Further: the preparation method of the high-strength aerated concrete comprises the following steps of;
(1) Preparation of modified red sandstone: dissolving fluorosilicate in water, adding sodium methyl silicate, and stirring to obtain the reinforcing agent; crushing 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 the reinforcing agent solution, stirring, standing for 1-2 h 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, uniformly stirring, and dropwise adding lactic acid; reacting for 15-20 min, and cooling to room temperature to obtain a solution B;
spraying the solution B on the surface of the substance A until water hanging appears on the surface of the substance A to obtain modified red sandstone;
(2) Preparing slurry: sequentially adding lime, cement, gypsum and a polycarboxylate water reducer, mixing, 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 obtain concrete slurry;
(3) Pouring the slurry into a mould, and curing for 3-7 h at the temperature of 45-55 ℃; after curing, demolding and cutting into a block body; autoclaved curing is carried out, the steam pressure is 0.8-2.0 MPa, the temperature is 180-210 ℃, the heating time is 1-3 h, the constant temperature is 4-8 h, the cooling time is 2-3 h, and the high-strength aerated concrete product is prepared after demoulding.
Further: the weight ratio of the fluorosilicate to the water in the step (1) is 1:10.
compared with the prior art, the invention has the following beneficial effects: the invention utilizes polyvinyl alcohol, nano silicon dioxide, a reinforcing agent and lactic acid to carry out multi-step treatment on natural red sandstone, thereby solving the problem of low strength of the natural red sandstone caused by easy softening of water absorption and low silicon dioxide content; the modified red sandstone has higher strength, and the aerated concrete prepared from the modified red sandstone has higher compressive strength. In addition, red sandstone is used for replacing traditional siliceous materials such as river sand or fly ash to prepare aerated concrete, so that reasonable utilization of discarded resources is realized, the shortage problem of river sand and fly ash resources is relieved, and the ecological environment-friendly requirement is met.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. 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
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 reducer and 70 parts of water.
The modified red sandstone is mainly prepared from natural red sandstone, polyvinyl alcohol, nano silicon dioxide, a reinforcing agent and lactic acid.
The reinforcing agent is prepared by mixing fluorosilicate and sodium methyl silicate.
The fluorosilicate is any one or more of sodium fluorosilicate, magnesium fluorosilicate, potassium fluorosilicate and lithium fluorosilicate.
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 of;
(1) Preparation of 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 reinforcing agent; crushing 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 the enhancer 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, uniformly stirring, and dropwise adding lactic acid; reacting for 15min, and cooling to room temperature to obtain a solution B; spraying the solution B on the surface of the substance A until water hanging appears on the surface of the substance A to obtain modified red sandstone;
(2) Preparing slurry: sequentially adding lime, cement, gypsum and a polycarboxylate water reducer, mixing, stirring for 25s, adding the modified red sandstone prepared in the step (1), water and sodium hydroxide, and stirring for 25s to obtain slurry; heating to 50 ℃, adding aluminum powder, and stirring for 25s to obtain concrete slurry;
(3) Pouring the slurry into a mould, and curing for 3 hours at the temperature of 45 ℃; after curing, demolding and cutting into a block body; and (3) autoclaved curing, wherein the steam pressure is 0.8MPa, the temperature is 180 ℃, the heating time is 1h, the constant temperature is 4h, the cooling time is 2h, and the high-strength aerated concrete finished product is prepared.
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 reducer and 73 parts of water.
The modified red sandstone is mainly prepared from natural red sandstone, polyvinyl alcohol, nano silicon dioxide, a reinforcing agent and lactic acid.
The reinforcing agent is prepared by mixing fluorosilicate and sodium methyl silicate.
The fluorosilicate is any one or more of sodium fluorosilicate, magnesium fluorosilicate, potassium fluorosilicate and lithium fluorosilicate.
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 of;
(1) Preparation of 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 reinforcing agent; crushing 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 the enhancer 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, uniformly stirring, and dropwise adding lactic acid; reacting for 17min, and cooling to room temperature to obtain a solution B; spraying the solution B on the surface of the substance A until water hanging appears on the surface of the substance A to obtain modified red sandstone;
(2) Preparing slurry: sequentially adding lime, cement, gypsum and a polycarboxylate water reducer, mixing, stirring for 37s, adding the modified red sandstone prepared in the step (1), water and sodium hydroxide, and stirring for 32s to obtain slurry; heating to 53 ℃, adding aluminum powder, and stirring for 37s to prepare concrete slurry;
(3) Pouring the slurry into a mould, and curing for 5h at the temperature of 51 ℃; after curing, demolding and cutting into a block body; and (3) autoclaved curing, wherein the steam pressure is 1.5MPa, the temperature is 195 ℃, the heating time is 2h, the constant temperature is 6h, the cooling time is 2.5h, and the high-strength aerated concrete finished product is prepared.
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 reducer and 80 parts of water.
The modified red sandstone is mainly prepared from natural red sandstone, polyvinyl alcohol, nano silicon dioxide, a reinforcing agent and lactic acid.
The reinforcing agent is prepared by mixing fluorosilicate and sodium methyl silicate.
The fluorosilicate is any one or more of sodium fluorosilicate, magnesium fluorosilicate, potassium fluorosilicate and lithium fluorosilicate.
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 of;
(1) Preparation of 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 reinforcing agent; crushing 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 the enhancer solution, stirring, standing for 2h 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, uniformly stirring, and dropwise adding lactic acid; reacting for 20min, and cooling to room temperature to obtain a solution B; spraying the solution B on the surface of the substance A until water hanging appears on the surface of the substance A to obtain modified red sandstone;
(2) Preparing slurry: sequentially adding lime, cement, gypsum and a polycarboxylate water reducer, mixing, stirring for 50s, adding the modified red sandstone prepared in the step (1), water and sodium hydroxide, and stirring for 50s to obtain slurry; heating to 60 ℃, adding aluminum powder, and stirring for 50s to obtain concrete slurry;
(3) Pouring the slurry into a mould, and curing for 7h at the temperature of 55 ℃; after curing, demolding and cutting into a block body; and (3) autoclaved curing, wherein the steam pressure is 2.0MPa, the temperature is 210 ℃, the heating time is 3h, the constant temperature is 8h, the cooling time is 3h, and the high-strength aerated concrete finished product is prepared.
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 reducer 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 of;
(1) Preparation of modified red sandstone: crushing 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, uniformly stirring, and dropwise adding lactic acid; reacting for 20min, and cooling to room temperature to obtain a solution B; spraying the solution B on the surface of the substance A until water hanging appears on the surface of the substance A to obtain modified red sandstone;
(2) Preparing slurry: sequentially adding lime, cement, gypsum and a polycarboxylate water reducer, mixing, stirring for 50s, adding the modified red sandstone prepared in the step (1), water and sodium hydroxide, and stirring for 50s to obtain slurry; heating to 60 ℃, adding aluminum powder, and stirring for 50s to obtain concrete slurry;
(3) Pouring the slurry into a mould, and curing for 7h at the temperature of 55 ℃; after curing, demolding and cutting into a block body; and (3) autoclaved curing, wherein the steam pressure is 2.0MPa, the temperature is 210 ℃, the heating time is 3h, the constant temperature is 8h, the cooling time is 3h, and the high-strength aerated concrete finished product is prepared.
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 reducer 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 of;
(1) Preparation of modified red sandstone: crushing red sandstone into 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, uniformly stirring, 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 water hanging occurs on the surface of the red sandstone, so as to obtain modified red sandstone;
(2) Preparing slurry: sequentially adding lime, cement, gypsum and a polycarboxylate water reducer, mixing, stirring for 50s, adding the modified red sandstone prepared in the step (1), water and sodium hydroxide, and stirring for 50s to obtain slurry; heating to 60 ℃, adding aluminum powder, and stirring for 50s to obtain concrete slurry;
(3) Pouring the slurry into a mould, and curing for 7h at the temperature of 55 ℃; after curing, demolding and cutting into a block body; and (3) autoclaved curing, wherein the steam pressure is 2.0MPa, the temperature is 210 ℃, the heating time is 3h, the constant temperature is 8h, the cooling time is 3h, and the high-strength aerated concrete finished product is prepared.
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 reducer and 80 parts of water.
The modified red sandstone is mainly prepared from natural red sandstone and a reinforcing agent.
The reinforcing agent is prepared by mixing fluorosilicate and sodium methyl silicate.
The fluorosilicate is any one or more of sodium fluorosilicate, magnesium fluorosilicate, potassium fluorosilicate and lithium fluorosilicate.
The gypsum is any one of natural dihydrate gypsum and phosphogypsum.
A preparation method of high-strength aerated concrete comprises the following steps of;
(1) Preparation of 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 reinforcing agent; crushing the red sandstone into continuous-grade particles with the particle size of 0.1-0.5 mu m; adding the enhancer 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 polycarboxylate water reducer, mixing, stirring for 50s, adding the modified red sandstone prepared in the step (1), water and sodium hydroxide, and stirring for 50s to obtain slurry; heating to 60 ℃, adding aluminum powder, and stirring for 50s to obtain concrete slurry;
(3) Pouring the slurry into a mould, and curing for 7h at the temperature of 55 ℃; after curing, demolding and cutting into a block body; and (3) autoclaved curing, wherein the steam pressure is 2.0MPa, the temperature is 210 ℃, the heating time is 3h, the constant temperature is 8h, the cooling time is 3h, and the high-strength aerated concrete finished product is prepared.
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 reducer 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 of;
(1) Preparing slurry: sequentially adding lime, cement, gypsum and a polycarboxylate water reducer, 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 obtain concrete slurry;
(2) Pouring the slurry into a mould, and curing for 7h at the temperature of 55 ℃; after curing, demolding and cutting into a block body; and (3) autoclaved curing, wherein the steam pressure is 2.0MPa, the temperature is 210 ℃, the heating time is 3h, the constant temperature is 8h, the cooling time is 3h, and the high-strength aerated concrete finished product is prepared.
Test comparison and analysis
Examples 1 to 3 are the present technical solutions;
in comparative example 1, modified red sandstone was prepared from natural red sandstone, polyvinyl alcohol, nano silica, and lactic acid, and the rest was the same as in example 3;
in comparative example 2, modified red sandstone was prepared from natural red sandstone, polyvinyl alcohol, and lactic acid, the remainder being the same as in example 3;
in comparative example 3, modified red sandstone was prepared from natural red sandstone and a reinforcing agent, and the rest was the same as in example 3;
in comparative example 4, the modified red sandstone was replaced with red sandstone, and the rest was the same as in example 3.
The strength of the aerated concrete is tested 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/m 3 | 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 reached 8.7MPa and above, and the compressive strength was greater than that of the concrete prepared from polyvinyl alcohol and lactic acid modified natural red sandstone alone and that prepared from the reinforcing agent modified red sandstone alone; and the compressive strength of the concrete prepared in the examples 1 to 3 is greater than that of the concrete prepared by replacing the modified red sandstone with the 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: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. The high-strength aerated concrete comprises the following raw materials: 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 polycarboxylic acid water reducer and 73 parts of water;
the modified red sandstone is mainly prepared from natural red sandstone, polyvinyl alcohol, nano silicon dioxide, a reinforcing agent and lactic acid;
the reinforcer is prepared by mixing fluorosilicate and sodium methyl silicate;
the fluorosilicate is any one or more of sodium fluorosilicate, magnesium fluorosilicate, potassium fluorosilicate and lithium fluorosilicate;
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;
the preparation method of the high-strength aerated concrete comprises the following steps of;
(1) Preparation of 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 reinforcing agent; crushing 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 the enhancer 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, uniformly stirring, and dropwise adding lactic acid; reacting for 17min, and cooling to room temperature to obtain a solution B; spraying the solution B on the surface of the substance A until water hanging appears on the surface of the substance A to obtain modified red sandstone;
(2) Preparing slurry: sequentially adding lime, cement, gypsum and a polycarboxylate water reducer, mixing, stirring for 37s, adding the modified red sandstone prepared in the step (1), water and sodium hydroxide, and stirring for 32s to obtain slurry; heating to 53 ℃, adding aluminum powder, and stirring for 37s to prepare concrete slurry;
(3) Pouring the slurry into a mould, and curing for 5h at the temperature of 51 ℃; after curing, demolding and cutting into a block body; and (3) autoclaved curing, wherein the steam pressure is 1.5MPa, the temperature is 195 ℃, the heating time is 2h, the constant temperature is 6h, the cooling time is 2.5h, and the high-strength aerated concrete finished product is prepared.
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