CN110105013B - High-strength anti-cracking foam concrete and preparation method thereof - Google Patents
High-strength anti-cracking foam concrete and preparation method thereof Download PDFInfo
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- CN110105013B CN110105013B CN201910376226.4A CN201910376226A CN110105013B CN 110105013 B CN110105013 B CN 110105013B CN 201910376226 A CN201910376226 A CN 201910376226A CN 110105013 B CN110105013 B CN 110105013B
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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
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to high-strength anti-cracking foam concrete and a preparation method thereof, wherein the high-strength anti-cracking foam concrete is prepared from the following raw materials in parts by weight: 200 portions of cement-containing material 240 portions, 20 to 45 portions of slag powder, 80 to 120 portions of water, 1 to 3 portions of waterproof agent, 1 to 5 portions of foaming agent, 0.2 to 0.5 portion of foam stabilizer, 45 to 70 portions of light aggregate and 0.3 to 0.8 portion of wood fiber. According to the invention, a double-foaming method of a physical foaming agent and a chemical foaming agent is adopted, and the use of wood fibers is combined, so that a large number of stable closed air holes can be formed in the foam concrete, and the convection and radiation effects in the air holes are weakened, thereby reducing the water absorption of the material and simultaneously ensuring that the high-strength anti-cracking foam concrete provided by the invention has a lower heat conductivity coefficient; and the performance of materials such as cement, slag powder, wood fiber and the like can be fully exerted by using the double-foaming method, and the high-strength anti-cracking foam concrete with higher strength and better crack resistance than the conventional foam concrete is obtained.
Description
Technical Field
The invention relates to the technical field of materials, in particular to high-strength anti-cracking foam concrete and a preparation method thereof.
Background
With the continuous development of the building industry, low-carbon energy conservation becomes a new development direction of modern buildings. The foam concrete is also called as foaming cement, lightweight concrete and the like, and is a novel building energy-saving material which is waste-utilizing, environment-friendly, energy-saving, low in cost and non-combustible. As a novel energy-saving environment-friendly building material, foam concrete is applied to a roof heat-insulating layer at a non-bearing part of a building, and the foam concrete has the following main advantages: low density, light weight, heat insulation, sound insulation, shock resistance and the like. However, the foam concrete has certain defects, such as low strength, cracking, water absorption and the like, which affect the popularization and application of the foam concrete.
Disclosure of Invention
Aiming at the problems, the high-strength anti-cracking foam concrete suitable for roof construction and the preparation method thereof are provided, and the high-strength anti-cracking foam concrete which can overcome the defects of low strength, cracking and the like and can have higher strength after initial setting is provided.
The specific technical scheme is as follows:
the invention provides high-strength anti-cracking foam concrete which is characterized by comprising the following raw materials in parts by weight: 200 portions of cement, 240 portions of slag powder, 20 to 45 portions of water, 80 to 120 portions of water, 1 to 3 portions of waterproof agent, 1 to 5 portions of foaming agent, 0.2 to 0.5 portion of foam stabilizer, 45 to 70 portions of light aggregate and 0.3 to 0.8 portion of wood fiber;
the foaming agent is prepared from a physical foaming agent and a chemical foaming agent according to a mass ratio of 1: 0.3, and the physical foaming agent is selected from one of a protein type foaming agent or a rosin type foaming agent, and the chemical foaming agent is selected from one of a sodium hydroxide solution and a hydrogen peroxide solution.
The high-strength anti-cracking foam concrete is also characterized in that cement is prepared from P.O42.5R ordinary portland cement and P.C32.5 composite portland cement in a mass ratio of 7: 3, mixing and forming.
The high-strength anti-cracking foam concrete is also characterized in that the slag powder is prepared from fly ash, steel slag, desulfurized gypsum and water-quenched slag according to the mass ratio of 6: 2: 1: 1 are mixed to form.
The high-strength anti-cracking foam concrete is characterized in that the waterproof agent is selected from one of a polycarboxylic acid water reducing agent, a naphthalene water reducing agent or an aliphatic water reducing agent.
The high-strength anti-cracking foam concrete also has the characteristic that the foam stabilizer is one selected from water-based calcium stearate, bone glue, alkylolamide, amine oxide, dodecyl dimethyl amine oxide, polyacrylamide or polyvinyl alcohol.
The high-strength anti-cracking foam concrete also has the characteristics that the light aggregate is ceramsite, and the particle size of the light aggregate is 3.75-11.75 mm.
The second aspect of the present invention provides a method for preparing the above high-strength anti-cracking foamed concrete, which has the following characteristics:
1) according to the weight parts, placing cement, slag powder, wood fiber and part of water in a stirrer to be stirred for 3-5 minutes, adding the light aggregate into the stirrer to be continuously stirred for 3-5 minutes to obtain a slurry mixture;
2) adding the balance of water, a physical foaming agent and a foam stabilizer into a foaming machine in sequence according to the parts by weight, stirring for 3-5 minutes, adding a chemical foaming agent into the foaming machine, continuously stirring for 5-8 minutes to prepare an aqueous solution, and foaming at high pressure to form foaming slurry;
3) adding 15-25% of foaming slurry into the slurry mixture under low-speed stirring according to the volume parts, stirring for a period of time to uniformly disperse the materials, adding the rest foaming slurry, stirring at a high speed for 2-3min, and finally performing film covering maintenance on the mixture after natural leveling to form the high-strength anti-cracking foam concrete.
The beneficial effect of above-mentioned scheme is:
1) according to the invention, the early strength type ordinary portland cement with higher early strength, the composite cement, the fly ash with low early strength and high later strength and other mineral admixtures are combined, so that the compressive strength of the foam concrete in and after the construction process is ensured;
2) according to the invention, a certain amount of foam stabilizer is added into the foaming agent, so that the surface tension of the foaming liquid can be reduced, the viscosity of the formed foam is improved, the foam concrete is effectively prevented from being porous and connected to form larger gaps, and the stability of the foam concrete under different conditions is improved;
3) according to the invention, a double-foaming method of a physical foaming agent and a chemical foaming agent is adopted, and the use of wood fibers is combined, so that a large number of stable closed air holes can be formed in the foam concrete, and the convection and radiation effects in the air holes are weakened, thereby reducing the water absorption of the material and simultaneously lowering the thermal conductivity coefficient of the foam concrete provided by the invention; and the performance of materials such as cement, slag powder, wood fiber and the like can be fully exerted by using the double-foaming method, so that the foam concrete with higher strength and better crack resistance compared with the conventional foam concrete is prepared.
4) Compared with the conventional concrete, the high-strength anti-cracking foam concrete provided by the invention has higher strength and better anti-cracking property, and the concrete can be used for foam concrete products and cast-in-place roof insulation layers.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.
The invention provides high-strength anti-cracking foam concrete, and a preparation method thereof comprises the following steps:
1) 200-240 parts of cement, 20-45 parts of slag powder, 0.3-0.8 part of wood fiber and part of water are put into a stirrer to be stirred for 3-5 minutes, and then 45-70 parts of light aggregate are added into the stirrer to be continuously stirred for 3-5 minutes to obtain a slurry mixture;
2) sequentially adding the balance of water, a physical foaming agent and 0.2-0.5 part of a foam stabilizer into a foaming machine according to the parts by weight, stirring for 3-5 minutes, adding a chemical foaming agent into the foaming machine, continuously stirring for 5-8 minutes to prepare an aqueous solution, and foaming at high pressure to form foaming slurry;
3) adding 15-25% of foaming slurry into the slurry mixture under low-speed stirring according to the volume parts, stirring for a period of time to uniformly disperse the materials, adding the rest foaming slurry and stirring at a high speed for 2-3min, and finally performing film covering maintenance on the mixture after natural leveling to form high-strength anti-cracking foam concrete;
wherein the total mass portion of the water is 80-120 portions; the total mass portion of the foaming agent is 1-5, and the foaming agent is prepared from a physical foaming agent and a chemical foaming agent according to the mass ratio of 1: 0.3, the foaming agent is formed by mixing, the physical foaming agent is selected from one of a protein type foaming agent or a rosin type foaming agent, and the chemical foaming agent is selected from one of a sodium hydroxide solution and a hydrogen peroxide solution; the cement is prepared from P.O42.5R ordinary Portland cement and P.C32.5 composite Portland cement in a mass ratio of 7: 3, mixing to form; the slag powder is prepared from fly ash, steel slag, desulfurized gypsum and water-quenched slag according to the mass ratio of 6: 2: 1: 1 mixing to form; the waterproof agent is selected from one of a polycarboxylic acid water reducing agent, a naphthalene water reducing agent or an aliphatic water reducing agent; the foam stabilizer is selected from one of water-based calcium stearate, bone glue, alkylolamide, amine oxide, dodecyl dimethyl amine oxide, polyacrylamide or polyvinyl alcohol; the light aggregate is ceramsite, and the particle size of the light aggregate is 3.75-11.75 mm.
The amounts of the materials used in examples 1-3 of the invention are shown in the following table:
the performance tests for the high strength, crack resistant, foamed concrete provided in examples 1-3 above are shown in the following table:
| example 1 | Example 2 | Example 3 | |
| Dry density/(kg/m)3) | 350 | 375 | 320 |
| Compressive strength/MPa for 25 days | 3.2 | 3.5 | 3.3 |
| Thermal conductivity/(w/(m.k)) | 0.066 | 0.069 | 0.064 |
| Volume Water absorption (%) | 6.5 | 6.8 | 6.6 |
The above table shows that the high-strength anti-cracking foam concrete prepared by optimizing the components meets the requirements of JG/T266-2011 in various performances and has superior index values.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (5)
1. The high-strength anti-cracking foam concrete is characterized by comprising the following raw materials in parts by weight: 200 portions of cement, 240 portions of slag powder, 20 to 45 portions of water, 80 to 120 portions of water, 1 to 3 portions of waterproof agent, 1 to 5 portions of foaming agent, 0.2 to 0.5 portion of foam stabilizer, 45 to 70 portions of light aggregate and 0.3 to 0.8 portion of wood fiber;
the foaming agent is prepared from a physical foaming agent and a chemical foaming agent according to a mass ratio of 1: 0.3, the foaming agent is formed by mixing, the physical foaming agent is selected from one of a protein type foaming agent or a rosin type foaming agent, and the chemical foaming agent is selected from one of a sodium hydroxide solution and a hydrogen peroxide solution;
wherein the cement is prepared from P.O42.5R ordinary portland cement and P.C32.5 composite portland cement in a mass ratio of 7: 3, mixing to form; the slag powder is prepared from fly ash, steel slag, desulfurized gypsum and water-quenched slag according to the mass ratio of 6: 2: 1: 1 are mixed to form.
2. The high-strength anti-cracking foamed concrete according to claim 1, wherein the water-proofing agent is one selected from a polycarboxylic acid water-reducing agent, a naphthalene water-reducing agent or an aliphatic water-reducing agent.
3. The high strength, crack resistant, foamed concrete according to claim 1, wherein said foam stabilizer is one selected from the group consisting of water-based calcium stearate, bone glue, alkylolamides, amine oxide, dodecyldimethyl amine oxide, polyacrylamide and polyvinyl alcohol.
4. The high strength anti-cracking foamed concrete according to claim 1, wherein the lightweight aggregate is ceramsite and has a particle size of 3.75-11.75 mm.
5. A method for preparing a high strength anti-cracking foamed concrete according to any one of claims 1 to 4, comprising the steps of:
1) according to the weight parts, placing cement, slag powder, wood fiber and part of water in a stirrer to be stirred for 3-5 minutes, adding the light aggregate into the stirrer to be continuously stirred for 3-5 minutes to obtain a slurry mixture;
2) adding the balance of water, a physical foaming agent and a foam stabilizer into a foaming machine in sequence according to the parts by weight, stirring for 3-5 minutes, adding a chemical foaming agent into the foaming machine, continuously stirring for 5-8 minutes to prepare an aqueous solution, and foaming at high pressure to form foaming slurry;
3) adding 15-25% of foaming slurry into the slurry mixture under low-speed stirring according to the volume parts, stirring for a period of time to uniformly disperse the materials, adding the rest foaming slurry, stirring at a high speed for 2-3min, and finally performing film covering maintenance on the mixture after natural leveling to form the high-strength anti-cracking foam concrete.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910376226.4A CN110105013B (en) | 2019-05-07 | 2019-05-07 | High-strength anti-cracking foam concrete and preparation method thereof |
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| CN201910376226.4A CN110105013B (en) | 2019-05-07 | 2019-05-07 | High-strength anti-cracking foam concrete and preparation method thereof |
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| CN110105013A CN110105013A (en) | 2019-08-09 |
| CN110105013B true CN110105013B (en) | 2021-10-01 |
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| CN110451861B (en) * | 2019-08-31 | 2022-02-08 | 四川圣吉鸿博建筑材料有限公司 | Preparation method of light foam concrete |
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| CN113149543A (en) * | 2021-03-11 | 2021-07-23 | 四川齐能新型材料有限公司 | Non-autoclaved high-strength foam concrete and preparation method thereof |
| CN113149707A (en) * | 2021-04-24 | 2021-07-23 | 上海练定新材料科技有限公司 | Compression-resistant foam concrete and preparation method thereof |
| CN113264717B (en) * | 2021-06-11 | 2023-03-21 | 东北大学 | Large-mixing-amount solid waste base-activated foam concrete and preparation method thereof |
| CN113336570B (en) * | 2021-07-02 | 2023-04-21 | 重庆大学 | Novel composite foaming gypsum sound absorption material and preparation method thereof |
| CN113929389B (en) * | 2021-10-25 | 2022-08-12 | 杭州瑞鼎建材有限公司 | High-strength lightweight concrete and preparation method thereof |
| CN115108769B (en) * | 2022-07-29 | 2023-04-07 | 烟台大学 | High-performance mixed alkali-shock foam concrete and preparation method thereof |
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