CN114835429A - Foam concrete additive - Google Patents
Foam concrete additive Download PDFInfo
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- CN114835429A CN114835429A CN202210385879.0A CN202210385879A CN114835429A CN 114835429 A CN114835429 A CN 114835429A CN 202210385879 A CN202210385879 A CN 202210385879A CN 114835429 A CN114835429 A CN 114835429A
- Authority
- CN
- China
- Prior art keywords
- foam concrete
- parts
- additive
- concrete additive
- foam
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 239000011381 foam concrete Substances 0.000 title claims abstract description 51
- 239000000654 additive Substances 0.000 title claims abstract description 36
- 230000000996 additive effect Effects 0.000 title claims abstract description 35
- VJHCJDRQFCCTHL-UHFFFAOYSA-N acetic acid 2,3,4,5,6-pentahydroxyhexanal Chemical compound CC(O)=O.OCC(O)C(O)C(O)C(O)C=O VJHCJDRQFCCTHL-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 17
- 229920000142 Sodium polycarboxylate Polymers 0.000 claims abstract description 16
- 239000004816 latex Substances 0.000 claims abstract description 15
- 229920000126 latex Polymers 0.000 claims abstract description 15
- 239000006004 Quartz sand Substances 0.000 claims abstract description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 238000002360 preparation method Methods 0.000 claims abstract description 5
- 239000004568 cement Substances 0.000 claims description 26
- 238000003756 stirring Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims 1
- 239000002002 slurry Substances 0.000 abstract description 17
- 230000000740 bleeding effect Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 5
- 239000004567 concrete Substances 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 4
- 238000001556 precipitation Methods 0.000 abstract description 3
- 238000005204 segregation Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 231100000956 nontoxicity Toxicity 0.000 abstract description 2
- 239000006260 foam Substances 0.000 description 14
- 238000002474 experimental method Methods 0.000 description 7
- 239000000047 product Substances 0.000 description 6
- 239000002893 slag Substances 0.000 description 5
- 206010016807 Fluid retention Diseases 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000573 polycarboxylate cement Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000004088 foaming agent Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 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 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229920002522 Wood fibre Polymers 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 239000002025 wood fiber 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a foam concrete additive which is composed of sodium polycarboxylate, carboxymethyl cellulose ether, lignocellulose, dispersible latex powder and quartz sand. The concrete additive provided by the invention has the advantages of easily purchased raw materials, moderate price, simple and easily operated preparation method, no toxicity, no harm, little environmental pollution, safety and environmental protection. The additive overcomes the problems of poor process adaptability, unsatisfactory slurry forming effect, poor stability, easy generation of bleeding segregation, poor stability, easy generation of hard precipitation and the like in the prior foam concrete production process, and after the additive is added, the foam concrete slurry is stable and smooth and is easy to construct, the construction efficiency is greatly improved, and the additive has great practical construction application value.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a foam concrete additive.
Background
The foam concrete is light concrete which is prepared by taking cement as a bonding material and taking solid wastes such as furnace slag and the like as aggregates and adding foam and fully stirring and mixing, has the problems of poor process adaptability, unsatisfactory slurry forming effect, poor stability, easy generation of bleeding segregation, poor stability, easy generation of hard precipitation and the like in the existing foam concrete production process, needs to improve the working performance in the actual construction process, and is beneficial to the transportation and pouring of the foam concrete.
Disclosure of Invention
The invention aims to provide a foam concrete additive.
In order to achieve the purpose, the invention is implemented according to the following technical scheme:
the foam concrete additive consists of sodium polycarboxylate, carboxymethyl cellulose ether, lignocellulose, dispersible emulsion powder and quartz sand.
Further, each part of the foam concrete additive comprises, by weight, 0.5-2 parts of the sodium polycarboxylate, 1-3 parts of the carboxymethyl cellulose ether, 1-3 parts of the lignocellulose, 2-5 parts of the dispersible latex powder and 1-3 parts of the quartz sand.
Preferably, each part of the foam concrete additive comprises 1 part of the sodium polycarboxylate, 2 parts of the carboxymethyl cellulose ether, 2 parts of the lignocellulose, 3 parts of the dispersible latex powder and 1.8 parts of the quartz sand by weight.
Preferably, the fineness of the quartz sand is more than 50 meshes.
The invention relates to a preparation method of a foam concrete additive, which comprises the following steps: and (2) pouring 1 part of sodium polycarboxylate, 2 parts of carboxymethyl cellulose ether, 2 parts of lignocellulose, 3 parts of dispersible latex powder and 1.8 parts of quartz sand into a roller mixer according to parts by weight, fully and uniformly stirring, and bagging to obtain the foam concrete additive.
The invention relates to an application of a foam concrete additive, which comprises the following steps: when the foam concrete is mixed, the foam concrete additive is added according to one percent of the cement dosage, and the foam concrete for production is formed after full stirring.
The invention has the beneficial effects that:
the invention relates to a foam concrete additive, which has the following technical effects compared with the prior art:
(1) the concrete additive provided by the invention has the advantages of easily purchased raw materials, moderate price, simple and easily operated preparation method, no toxicity, no harm, little environmental pollution, safety and environmental protection.
(2) The additive provided by the invention overcomes the problems of poor process adaptability, poor grouting effect, poor stability, easy generation of bleeding segregation, poor stability, easy generation of hard precipitation and the like in the existing foam concrete production process, and after the additive is added, foam concrete slurry is stable and smooth and is easy to construct, the construction efficiency is greatly improved, and the additive has great practical construction application value.
Detailed Description
The invention is further described below in conjunction with specific examples, which are set forth to illustrate, but are not to be construed as limiting the invention.
According to the mass ratio, 1 part of sodium polycarboxylate, 2 parts of carboxymethyl cellulose ether, 2 parts of lignocellulose, 3 parts of dispersible latex powder and 1.8 parts of quartz sand with fineness of more than 50 meshes. Weighing the above materials, pouring into a drum mixer in proportion, stirring thoroughly, and bagging to obtain the final product. When the foam concrete is mixed, finished product additives are added according to one percent of the cement dosage, and the foam concrete for production is formed after full stirring.
1% of the amount of the sodium polycarboxylate cement; the main function is water reduction, so as to improve the strength of the foam concrete, reduce the cement consumption and keep the foam in the slurry evenly distributed.
The dosage of 10 ten thousand units of carboxymethyl cellulose ether is 2 percent of the dosage of cement, thereby increasing the viscosity of the slurry and stabilizing the slurry. Is beneficial to the stability of foam in the slurry and reduces the foam loss. 2% of the dosage of the lignocellulose cement, increases the water retention of the foam concrete, and reduces bleeding. 3 percent of the dosage of the dispersible latex powder cement. The internal stress of the foam concrete is changed, the cracking of the finished product is reduced, and the strength of the finished product of the foam concrete is further improved.
Experiment:
purpose of the experiment: the design effect of the additive and the effect of various components are tested.
The experimental principle is as follows:
1) proper amount of sodium polycarboxylate is added to reduce water, so as to improve the strength of the foam concrete, reduce the cement consumption and keep the uniform distribution of foam in the slurry.
2) The carboxymethyl cellulose ether increases the viscosity of the slurry and stabilizes the slurry. The foam in the slurry is stable, the foam is uniformly distributed, and the foam loss is reduced.
3) Lignocellulose increases the water retention of the foam concrete and reduces bleeding.
4) The emulsion powder can be dispersed, the internal stress of the foam concrete is changed, the cracking of the finished product is reduced, and the strength of the finished product of the foam concrete is further improved.
Experimental equipment and materials:
equipment: the model of the cement mortar mixer is NJ-160A, the model of the cement mortar fluidity tester is NLD-3, the model of the full-automatic specific surface area tester is FBT-9, the concrete penetration resistance tester HG-1000s, the standard cement curing box GB/T17671-40A, the model of the electric bending resistance tester DKZ-5000, the model of the constant stress pressure tester BC-300 and the model of the pressure tester SYE-2000. 100 x 100 mm test block module, 5000 ml measuring cylinder, collapse barrel, meter ruler and electronic scale. PO42.5R cement, power plant slag and animal foaming agent.
Preparing foam concrete:
the process flow comprises the following steps: selecting raw materials, stirring to produce light mortar, adding foam, forming foam concrete, reversing mold, maintaining, and detecting
The method comprises the following operation steps:
preparation of raw materials: solid waste slag of a thermal power plant is screened, particles with the particle size larger than 10 mm are removed, the solid waste slag is used as aggregate of light foam concrete, and P.O42.5R (common silicate early strength cement) is used as a cementing material, an additive and an animal foaming agent.
Stirring and pulping: mixing and stirring the slag, the cement and the additive (the dosage is 3 percent of the cement) with tap water to prepare mortar, wherein the slump is between 100 and 120 millimeters.
Preparing foam by using an animal foaming agent, and stirring and mixing the foam and the mortar components to form the light foam concrete.
And respectively filling the foam concrete into a measuring cylinder and a test block module.
Maintaining the test block for 28 days
And measuring the compression strength and the bending strength of the test block.
Experiment design:
the formula of the additive is as follows: 1 percent of the consumption of the polycarboxylic acid sodium cement,
the dosage of 10 ten thousand units of carboxymethyl cellulose ether is 2 percent of the dosage of cement.
2 percent of the dosage of the lignocellulose cement.
3 percent of the dispersible latex powder cement
And (3) finishing experimental data:
a first group:
the dosage of 10 ten thousand units of carboxymethyl cellulose ether is 2 percent of the dosage of the cement
The dosage of the lignocellulose cement is 2 percent
3 percent of the dispersible latex powder cement
Second group:
1% of the amount of the sodium polycarboxylate cement;
2 percent of the dosage of the lignocellulose cement,
3 percent of the dosage of the dispersible latex powder cement.
Third group:
1% of the amount of the sodium polycarboxylate cement;
carboxymethyl cellulose ether used for 10 ten thousand units
3 percent of the dispersible latex powder cement
And a fourth group: .
1% of the amount of the sodium polycarboxylate cement;
the dosage of 10 ten thousand units of carboxymethyl cellulose ether is 2 percent of the dosage of the cement
2 percent of the dosage of the lignocellulose cement,
and (3) experimental evaluation:
1 and workability of 45 points, wherein the fluidity is 15 points, the cohesiveness is 15 points, and the water retention is 15 points.
2, slurry foam stability 25 minutes.
3, intensity 15 points
4 durability 15 points.
Experimental results and evaluation:
the first set of experiments: no sodium polycarboxylate is added, the fluidity is greatly reduced, and the foam concrete can not meet the pumping requirement. While the strength is reduced.
The second set of experiments: and no carboxymethyl cellulose ether is added, so that the cohesiveness of the slurry is reduced, the stability of foam in the slurry is reduced, and the foam floats upwards. Cracks appear in the later period of the product, and the durability is reduced.
The third set of experiments: no wood fiber is added, the water retention of the slurry is reduced, and the bleeding phenomenon occurs.
Fourth set of experiments: the additive-free dispersible latex powder reduces the fluidity of the slurry and the stability of the foam concrete.
The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.
Claims (6)
1. A foam concrete additive is characterized in that: the environment-friendly water-based paint is composed of sodium polycarboxylate, carboxymethyl cellulose ether, lignocellulose, dispersible latex powder and quartz sand.
2. The foam concrete additive according to claim 1 wherein: according to parts by weight, each part of the foam concrete additive comprises 0.5-2 parts of sodium polycarboxylate, 1-3 parts of carboxymethyl cellulose ether, 1-3 parts of lignocellulose, 2-5 parts of dispersible latex powder and 1-3 parts of quartz sand.
3. The foam concrete additive according to claim 2, wherein: according to parts by weight, each part of the foam concrete additive comprises 1 part of the sodium polycarboxylate, 2 parts of the carboxymethyl cellulose ether, 2 parts of the lignocellulose, 3 parts of the dispersible latex powder and 1.8 parts of the quartz sand.
4. The foam concrete additive according to claims 1-3 wherein: the fineness of the quartz sand is more than 50 meshes.
5. A preparation method of a foam concrete additive is characterized by comprising the following steps: and (2) pouring 1 part of sodium polycarboxylate, 2 parts of carboxymethyl cellulose ether, 2 parts of lignocellulose, 3 parts of dispersible latex powder and 1.8 parts of quartz sand into a roller mixer according to parts by weight, fully and uniformly stirring, and bagging to obtain the foam concrete additive.
6. The application of the foam concrete additive is characterized in that: when the foam concrete is mixed, the foam concrete additive is added according to one percent of the cement dosage, and the foam concrete for production is formed after full stirring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210385879.0A CN114835429A (en) | 2022-04-13 | 2022-04-13 | Foam concrete additive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210385879.0A CN114835429A (en) | 2022-04-13 | 2022-04-13 | Foam concrete additive |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114835429A true CN114835429A (en) | 2022-08-02 |
Family
ID=82563541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210385879.0A Pending CN114835429A (en) | 2022-04-13 | 2022-04-13 | Foam concrete additive |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114835429A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140174325A1 (en) * | 2011-08-02 | 2014-06-26 | Lafarge | Process for the production of a rapid hydraulic binder |
| CN107324735A (en) * | 2017-07-13 | 2017-11-07 | 重庆大学 | A kind of ultralight foam concrete and preparation method thereof |
| CN108328993A (en) * | 2018-03-29 | 2018-07-27 | 合肥市闵葵电力工程有限公司 | A kind of energy saving concrete insulating brick and preparation method thereof |
| CN109678424A (en) * | 2019-01-14 | 2019-04-26 | 青岛天利兴达新型建材有限公司 | A kind of autoclave aerated concrete building block and preparation method thereof |
| CN111574119A (en) * | 2020-05-17 | 2020-08-25 | 郑宝霞 | Foam concrete with high light weight and performance and preparation method thereof |
-
2022
- 2022-04-13 CN CN202210385879.0A patent/CN114835429A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140174325A1 (en) * | 2011-08-02 | 2014-06-26 | Lafarge | Process for the production of a rapid hydraulic binder |
| CN107324735A (en) * | 2017-07-13 | 2017-11-07 | 重庆大学 | A kind of ultralight foam concrete and preparation method thereof |
| CN108328993A (en) * | 2018-03-29 | 2018-07-27 | 合肥市闵葵电力工程有限公司 | A kind of energy saving concrete insulating brick and preparation method thereof |
| CN109678424A (en) * | 2019-01-14 | 2019-04-26 | 青岛天利兴达新型建材有限公司 | A kind of autoclave aerated concrete building block and preparation method thereof |
| CN111574119A (en) * | 2020-05-17 | 2020-08-25 | 郑宝霞 | Foam concrete with high light weight and performance and preparation method thereof |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20220802 |