CN112551979A - Autoclaved aerated concrete and preparation method thereof - Google Patents
Autoclaved aerated concrete and preparation method thereof Download PDFInfo
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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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/32—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed at least two layers being foamed and next to each other
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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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/10—Lime cements or magnesium oxide cements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2266/00—Composition of foam
- B32B2266/04—Inorganic
- B32B2266/049—Water-setting material, e.g. concrete, plaster or asbestos cement
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/726—Permeability to liquids, absorption
- B32B2307/7265—Non-permeable
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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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
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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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/29—Frost-thaw resistance
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—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
Abstract
The invention discloses autoclaved aerated concrete, which relates to the technical field of autoclaved aerated concrete and comprises an outer surface layer, a connecting layer and a core layer, wherein the outer surface layer is made of high-strength concrete, cellulose ether, redispersible polymer latex powder and an anti-cracking agent, the connecting layer is made of cement, quartz sand, heavy calcium powder, redispersible polymer latex powder, cellulose ether and an anti-cracking agent, and the core layer is made of cement, fly ash, lime, gypsum, aluminum powder paste and waste slurry; the invention also provides a preparation method, which comprises the steps of preparing the outer surface layer concrete, the connecting layer concrete and the core layer concrete, then horizontally and uniformly filling the outer surface layer concrete, the connecting layer concrete and the core layer concrete into the mould, finally placing the mould into a steam-pressing room for steam-pressing air-entrapping, and demoulding after curing. The invention maintains the good lightweight property, mechanical strength and frost resistance of the traditional autoclaved aerated concrete, greatly improves the waterproof capability and ensures that the autoclaved aerated concrete has wider applicability.
Description
Technical Field
The invention relates to the technical field of autoclaved aerated concrete, and particularly relates to autoclaved aerated concrete and a preparation method thereof.
Background
The autoclaved aerated concrete is a light porous silicate product prepared by taking siliceous materials (sand, fly ash, siliceous tailings and the like) and calcareous materials (lime, cement) as main raw materials, adding a gas former (aluminum powder), and carrying out the technical processes of proportioning, stirring, pouring, pre-curing, cutting, autoclaving, curing and the like.
The autoclaved aerated concrete has the advantages of heat preservation, fire resistance, flame retardance, sound absorption, sound insulation, lightness, processability and the like because innumerable tiny air holes are formed inside the autoclaved aerated concrete and form a static air layer in the material, but the air holes can also make the autoclaved aerated concrete easy to absorb water and moisture along with the advantages, so that the use of the autoclaved aerated concrete has limitation.
In order to improve the hygroscopicity of autoclaved aerated concrete products, a waterproof coating is often coated on the surface of the autoclaved aerated concrete products to play a waterproof role, but the method has the problems that the affinity of the waterproof coating and the surface of the autoclaved aerated concrete products is not high, moisture enters the autoclaved aerated concrete products from gaps, the autoclaved aerated concrete products expand after absorbing moisture, the waterproof coating is separated, and the like.
Disclosure of Invention
In view of the above, the invention provides the autoclaved aerated concrete and the preparation method thereof, and the outer surface layer, the connecting layer and the core layer are arranged, so that the traditional autoclaved aerated concrete is kept to have better lightweight property, mechanical strength and frost resistance, and meanwhile, the waterproof capability is effectively improved, so that the autoclaved aerated concrete has wider applicability.
In order to solve the technical problems, the technical scheme provided by the invention is that the autoclaved aerated concrete comprises an outer surface layer, a connecting layer and a core layer,
the materials of the outer surface layer comprise high-strength concrete, cellulose ether, redispersible polymer emulsion powder and an anti-cracking agent;
the connecting layer is made of cement, quartz sand, heavy calcium carbonate powder, redispersible polymer latex powder, cellulose ether and an anti-cracking agent;
the core layer is made of cement, fly ash, lime, gypsum, aluminum powder paste and waste slurry.
Further, the material of the outer surface layer comprises the following components in parts by weight of dry materials: 80-90 parts of high-strength concrete, 2-5 parts of cellulose ether, 2-4 parts of redispersible polymer latex powder and 5-8 parts of anti-cracking agent.
Further, the high-strength concrete comprises the following components in parts by weight of dry materials: 50-70 parts of Portland cement, 10-25 parts of granite with the granularity of 1-3mm, 18-30 parts of fly ash, 8-9 parts of silica powder and 0.75-1.25 parts of water reducing agent.
Further, the water reducing agent is a naphthalene high-efficiency water reducing agent.
Further, the material of the connecting layer comprises the following components in parts by weight of dry materials: 40-70 parts of Portland cement, 20-35 parts of quartz sand, 5-10 parts of heavy calcium carbonate powder, 1-5 parts of redispersible polymer latex powder, 2-5 parts of cellulose ether and 5-8 parts of anti-cracking agent.
Further, the granularity range of the quartz sand is 50-60 meshes; the particle size range of the heavy calcium powder is 200 meshes.
Further, the core layer comprises the following components in parts by weight of dry materials: 10-20 parts of Portland cement, 65-70 parts of fly ash, 20-25 parts of lime, 1-3 parts of gypsum and 0.04-0.08 part of aluminum powder paste.
Further, the portland cement in the core layer is 425 ordinary portland cement.
Further, the main components of the waste slurry are calcium hydroxide, calcium silicate hydrate gel and water, and the ratio of the mass of the waste slurry to the total mass of the dry materials in the core layer is 0.01-0.03.
The technical scheme of the application also provides a preparation method of the autoclaved aerated concrete, which comprises the following steps:
a. preparing outer surface layer concrete according to the outer surface layer group distribution, preparing connecting layer concrete according to the connecting layer group distribution, and preparing core layer concrete according to the core layer group;
b. uniformly filling outer surface layer concrete with the thickness of 7-12mm into the mould horizontally;
c. uniformly filling connecting layer concrete with the thickness of 3-5mm into the die for forming the outer surface layer;
d. uniformly filling core layer concrete with the thickness of 5-25cm into the mould for forming the connecting layer;
e. and (4) placing the mould filled with the outer surface layer concrete, the connecting layer concrete and the core layer concrete into a steam-pressing room for steam-pressing air-entrapping operation, and demoulding after curing.
Based on the explanation above, this application compares with prior art, and its beneficial effect lies in:
according to the invention, the autoclaved aerated concrete is made into the outer surface layer, the connecting layer and the core layer, so that the waterproof capability is greatly improved while the traditional autoclaved aerated concrete has better lightweight property, mechanical strength and frost resistance, and the autoclaved aerated concrete has wider applicability for the following specific reasons;
(1) the outer surface layer is made of high-strength concrete as a main body, the main body has high compressive strength and low porosity, and a water-resistant layer with high bonding strength is formed by matching cellulose ether and redispersible polymer latex powder, so that the water resistance of the outer surface layer is obviously improved; the crack resistance agent has good dispersion effect, and the phenomena of poor hardening and cracking caused by too fast drying of cement are improved, so that the crack resistance agent is favorable for better combination with a connecting layer, the outer surface layer becomes a better bonding base material, and simultaneously, the outer surface layer can absorb certain internal stress, the plasticity is increased, and the autoclaved aerated concrete is favorable for processing and cutting; the naphthalene-based superplasticizer in the outer surface layer enhances the dispersion effect of ions in cement, and improves the initial collapse degree and the water reducing rate, so that the compatibility of other components is good, and the waterproof effect is better; the fly ash in the outer surface layer has lower water requirement, so that the cement amount and the water consumption are reduced, the temperature of the autoclaved aerated concrete during manufacturing can be reduced, the reaction during the formation of the outer surface layer is milder, and the workability is improved.
(2) The connecting layer mainly used connects extexine and sandwich layer, and the affinity degree of connecting layer and extexine and sandwich layer is high, makes difficult separation between extexine, connecting layer and the sandwich layer, plays buffering and reducing action to the internal stress that produces because of the sandwich layer is out of shape, makes difficult separation between extexine, connecting layer and the sandwich layer to water-proof effects has been strengthened.
(3) The bonding effect between the outer surface layer, the connecting layer and the bonding agent is better, so that outside water is not easy to enter the core layer through bonding positions, and the core layer is effectively prevented from water absorption and expansion, so that the waterproof effect is enhanced.
(4) By using the waste slurry in the core layer, on one hand, secondary pollution is reduced, on the other hand, the viscosity and the performance of the waste slurry can be improved by using the calcium hydroxide and the calcium silicate hydrate gel in the waste slurry, and the stability can be improved; the gypsum can improve the strength, reduce the shrinkage, slow down the setting thickening speed of slurry and ensure that the formation of pores is more uniform and smooth.
Drawings
FIG. 1 is a schematic structural diagram of an autoclaved aerated concrete of the present invention;
reference numerals in the drawings indicate: 1-outer surface layer, 2-connecting layer and 3-core layer.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following detailed description of the present invention is provided with reference to specific embodiments.
Example 1
The preparation method of the autoclaved aerated concrete comprises the following steps:
a. portland cement, granite with the granularity of 2mm, fly ash, silicon powder, a naphthalene-based high-efficiency water reducing agent, cellulose ether, redispersible polymer latex powder and an anti-cracking agent are mixed according to the mass ratio of 55: 15: 20: 8: 1: 5: 4: 8, uniformly mixing and adding water to prepare outer surface layer concrete;
portland cement, 60-mesh quartz sand, 200-mesh heavy calcium carbonate powder, redispersible polymer latex powder, cellulose ether and an anti-cracking agent are mixed according to the mass ratio of 55: 30: 8: 4: 4: 6, uniformly mixing and adding water to prepare connecting layer concrete;
425 ordinary portland cement, fly ash, lime, gypsum, aluminum powder paste and waste slurry are mixed according to the mass ratio of 17: 67: 23: 3:0.05: 3, uniformly mixing and adding water to prepare the core layer concrete.
b. Uniformly filling outer surface layer concrete with the thickness of 10mm into the mould horizontally;
c. uniformly filling connecting layer concrete with the thickness of 3mm into the die for forming the outer surface layer;
d. uniformly filling core layer concrete with the thickness of 15mm into the die for forming the connecting layer;
e. and (3) placing the mould filled with the outer surface layer concrete, the connecting layer concrete and the core layer concrete into a steam-pressing room for steam-pressing air-entrapping operation, and demoulding after curing to obtain the steam-pressing aerated concrete.
Example 2
The preparation method of the autoclaved aerated concrete comprises the following steps:
a. portland cement, granite with the granularity of 3mm, fly ash, silicon powder, a naphthalene-based high-efficiency water reducing agent, cellulose ether, redispersible polymer latex powder and an anti-cracking agent are mixed according to the mass ratio of 60: 15: 25: 9: 1: 5: 4: 8, uniformly mixing and adding water to prepare outer surface layer concrete;
portland cement, 60-mesh quartz sand, 200-mesh heavy calcium carbonate powder, redispersible polymer latex powder, cellulose ether and an anti-cracking agent are mixed according to the mass ratio of 60: 30: 8: 5: 4: 8, uniformly mixing and adding water to prepare connecting layer concrete;
425 ordinary portland cement, fly ash, lime, gypsum, aluminum powder paste and waste slurry are mixed according to the mass ratio of 18: 68: 23: 2.5:0.06: 3, uniformly mixing and adding water to prepare the core layer concrete.
b. Uniformly filling outer surface layer concrete with the thickness of 10mm into the mould horizontally;
c. evenly filling concrete with a thickness of 5mm into the mould for forming the outer surface layer;
d. horizontally and uniformly filling core layer concrete with the thickness of 15cm into the die for forming the connecting layer;
e. and (3) placing the mould filled with the outer surface layer concrete, the connecting layer concrete and the core layer concrete into a steam-pressing room for steam-pressing air-entrapping operation, and demoulding after curing to obtain the steam-pressing aerated concrete.
Example 3
The preparation method of the autoclaved aerated concrete comprises the following steps:
a. portland cement, granite with the granularity of 3mm, fly ash, silicon powder, a naphthalene-based high-efficiency water reducing agent, cellulose ether, redispersible polymer latex powder and an anti-cracking agent are mixed according to the mass ratio of 65: 20: 25: 8: 1: 5: 4: 8, uniformly mixing and adding water to prepare outer surface layer concrete;
portland cement, 60-mesh quartz sand, 200-mesh heavy calcium carbonate powder, redispersible polymer latex powder, cellulose ether and an anti-cracking agent are mixed according to the mass ratio of 65: 25: 7: 3: 4: 7, uniformly mixing and adding water to prepare connecting layer concrete;
425 ordinary portland cement, fly ash, lime, gypsum, aluminum powder paste and waste slurry are mixed according to the mass ratio of 18: 67: 23: 2: 0.06: 3, uniformly mixing and adding water to prepare the core layer concrete.
b. Uniformly filling outer surface layer concrete with the thickness of 10mm into the mould horizontally;
c. evenly filling concrete with a thickness of 5mm into the mould for forming the outer surface layer;
d. uniformly filling core layer concrete with the thickness of 20mm into the die for forming the connecting layer;
e. and (3) placing the mould filled with the outer surface layer concrete, the connecting layer concrete and the core layer concrete into a steam-pressing room for steam-pressing air-entrapping operation, and demoulding after curing to obtain the steam-pressing aerated concrete.
After the autoclaved aerated concrete prepared in example 1, example 2 and example 3 was left for 8 days, the cubic compressive strength, dry bulk density and frost resistance index were measured according to the method described in autoclaved aerated concrete block GB 11968-20062018-7-18, and the data were obtained as follows:
according to the embodiment, the material prepared from the autoclaved aerated concrete provided by the invention has better lightweight property, mechanical strength and frost resistance.
Taking the autoclaved aerated concrete prepared in the embodiments 1, 2 and 3 and common commercially available ordinary autoclaved aerated concrete which are placed for 8 days, respectively bonding the autoclaved aerated concrete and the common commercially available ordinary autoclaved aerated concrete by using common commercially available waterproof binders, uniformly coating common commercially available waterproof emulsion paint on one surface of the common autoclaved aerated concrete, placing the ordinary autoclaved aerated concrete in a cool and ventilated place for 3 days to prepare an autoclaved aerated concrete wall, respectively spraying the autoclaved aerated concrete wall onto the wall for 72 hours, respectively taking the edge of the autoclaved aerated concrete wall, spraying the autoclaved aerated concrete which cannot be sprayed to the side wall of the autoclaved aerated concrete, splitting the autoclaved aerated concrete, and determining the water immersion depth to obtain the following data:
| item | Depth of water penetration (cm) | 24h depth of water penetration (cm) | 72h depth of water penetration (cm) |
| Example 1 | 0.1 | 0.4 | 2.3 |
| Example 2 | 0 | 0.4 | 2.6 |
| Example 3 | 0.1 | 0.5 | 2.2 |
| Ordinary autoclaved aerated concrete | 0.2 | 3.9 | 12.5 |
Experiments also find that the phenomenon that the ordinary autoclaved aerated concrete coated with the waterproof emulsion paint on the outer wall is partially separated from the ordinary autoclaved aerated concrete at the beginning of 16 hours is considered because a certain gap exists at the bonding part between the ordinary autoclaved aerated concrete, so that the waterproof paint on the outer wall does not completely cover the bonding part, when water enters from the gap, due to the characteristics of the ordinary autoclaved aerated concrete, the volume is changed after water absorption and expansion, so that the partial ordinary autoclaved aerated concrete is separated from the bonding agent, and the phenomenon that the ordinary autoclaved aerated concrete is partially separated from the waterproof paint on the outer wall is generated.
Compared with the common autoclaved aerated concrete, the water penetration depth of the common autoclaved aerated concrete in each time period is obviously higher than that of the autoclaved aerated concrete after being sprayed for 72 hours, the volume expansion deformation of the common autoclaved aerated concrete after water absorption occurs, part of the common autoclaved aerated concrete is separated from the binder, and part of the common autoclaved aerated concrete is separated from the waterproof paint of the outer wall; the outer surface layer has good waterproof capability, and can effectively play a role in waterproofing, and in addition, the bonding effect between the outer surface layer and the bonding agent is better, so that external water is not easy to enter the core layer through the bonding part, and the water absorption and expansion of the core layer are effectively avoided, and meanwhile, the waterproof capability is also enhanced.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (10)
1. An autoclaved aerated concrete is characterized by comprising an outer surface layer, a connecting layer and a core layer,
the materials of the outer surface layer comprise high-strength concrete, cellulose ether, redispersible polymer emulsion powder and an anti-cracking agent;
the connecting layer is made of cement, quartz sand, heavy calcium carbonate powder, redispersible polymer latex powder, cellulose ether and an anti-cracking agent;
the core layer is made of cement, fly ash, lime, gypsum, aluminum powder paste and waste slurry.
2. The autoclaved aerated concrete according to claim 1, wherein the outer surface layer comprises the following components in parts by weight of dry materials: 80-90 parts of high-strength concrete, 2-5 parts of cellulose ether, 2-4 parts of redispersible polymer latex powder and 5-8 parts of anti-cracking agent.
3. The autoclaved aerated concrete according to claim 2, wherein the high-strength concrete comprises the following components in parts by weight of dry materials: 50-70 parts of Portland cement, 10-25 parts of granite with the granularity of 1-3mm, 18-30 parts of fly ash, 8-9 parts of silica powder and 0.75-1.25 parts of water reducing agent.
4. The autoclaved aerated concrete according to claim 3, wherein the water reducing agent is a naphthalene-based superplasticizer.
5. The autoclaved aerated concrete according to claim 1, wherein the connecting layer is made of the following materials in parts by weight: 40-70 parts of Portland cement, 20-35 parts of quartz sand, 5-10 parts of heavy calcium carbonate powder, 1-5 parts of redispersible polymer latex powder, 2-5 parts of cellulose ether and 5-8 parts of anti-cracking agent.
6. The autoclaved aerated concrete according to claim 5, wherein the quartz sand has a particle size range of 50-60 mesh; the particle size range of the heavy calcium powder is 200 meshes.
7. The autoclaved aerated concrete according to claim 1, wherein the core layer comprises the following components in parts by weight of dry materials: 10-20 parts of Portland cement, 65-70 parts of fly ash, 20-25 parts of lime, 1-3 parts of gypsum and 0.04-0.08 part of aluminum powder paste.
8. The autoclaved aerated concrete according to claim 7, wherein the portland cement in the core layer is 425 ordinary portland cement.
9. The autoclaved aerated concrete according to claim 7, wherein the main components of the slugs are calcium hydroxide, calcium silicate hydrate gel and water, and the mass ratio of the slugs to the total mass of the dry materials in the core layer is in the range of 0.01 to 0.03.
10. The method for preparing an autoclaved aerated concrete according to any one of claims 1 to 9, comprising the following steps:
a. preparing outer surface layer concrete according to the outer surface layer group distribution, preparing connecting layer concrete according to the connecting layer group distribution, and preparing core layer concrete according to the core layer group;
b. uniformly filling outer surface layer concrete with the thickness of 7-12mm into the mould horizontally;
c. uniformly filling connecting layer concrete with the thickness of 3-5mm into the die for forming the outer surface layer;
d. uniformly filling core layer concrete with the thickness of 5-25cm into the mould for forming the connecting layer;
e. and (4) placing the mould filled with the outer surface layer concrete, the connecting layer concrete and the core layer concrete into a steam-pressing room for steam-pressing air-entrapping operation, and demoulding after curing.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113700209A (en) * | 2021-07-20 | 2021-11-26 | 江苏宝鹏建筑工业化材料有限公司 | Waterproof autoclaved aerated concrete slab |
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