CN107556035B - Concrete product and preparation method thereof - Google Patents
Concrete product and preparation method thereof Download PDFInfo
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- CN107556035B CN107556035B CN201710815740.4A CN201710815740A CN107556035B CN 107556035 B CN107556035 B CN 107556035B CN 201710815740 A CN201710815740 A CN 201710815740A CN 107556035 B CN107556035 B CN 107556035B
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Abstract
The invention discloses a concrete product and a preparation method thereof. The concrete product is prepared from the following raw materials: 50-100 parts of cement, 25-55 parts of fly ash, 2-10 parts of graphene, 50-100 parts of water, 3-8 parts of foaming agent, 0.5-5 parts of foam stabilizer, 0.5-2 parts of early strength agent and 0.5-3 parts of water reducing agent. The heat insulating performance of the concrete product is improved.
Description
Technical Field
The invention relates to a concrete product and a preparation method thereof, in particular to a self-heat-preservation concrete product and a preparation method thereof.
Background
At present, building energy conservation is more and more concerned by people. The structure energy-saving integration becomes an important direction for building material development and application. The existing heat insulation system has the problems of crack, falling off, complex construction process, difficult adhesion and combination with an external wall and the like. The self-insulation concrete product is a novel wall material integrating bearing and heat insulation, and has the advantages of low heat conductivity coefficient, heat insulation, light weight, high strength, fire resistance and the like. At present, the main measures for improving the thermal performance of the self-insulation concrete product comprise optimizing the components of the building block material and the building block hole structure, and adopting a composite structure to compound the concrete product. However, the main measures for improving the thermal performance of the self-insulation concrete product are still complex at present, and the industrial production is difficult to realize. In addition, the self-insulation concrete product still needs to be further improved in the aspects of heat insulation performance and the like.
Graphene is an ultrathin nanometer material consisting of pure carbon atoms, has an ultra-large specific surface area, and has excellent mechanical properties and mechanical properties due to the layered structure. By utilizing the special performance of the graphene, the performance of the concrete product can be improved. For example, CN106280264A discloses an exterior wall panel concrete product with excellent mechanical properties, comprising: 25-55 parts of expandable polystyrene, 25-35 parts of polyurethane modified epoxy resin, 35-45 parts of organic silicon modified phenolic resin, 8-12 parts of modified graphite powder, 1.5-2.5 parts of bis-tributylphenol polyoxyethylene ether, 3-4 parts of epoxidized soybean oil, 4-8 parts of mica powder, 8-12 parts of graphene nanosheets, 6-10 parts of calcium silicate, 2-4 parts of aluminum oxide, 3-5 parts of sodium silicate, 2-3 parts of magnesium oxide, 4-12 parts of calcined pottery clay, 1.5-2.5 parts of phosphoric acid, 1.5-2.5 parts of p-methanesulfonic acid, 2-3 parts of physical foaming agent and 35-55 parts of water. However, the organic material and the inorganic material are completely mixed together, and the function of the graphene cannot be fully exerted, so that the material has poor flame retardant property and low thermal insulation property. In addition, in the prior art, the mechanical property of the building material is improved by adopting the graphene, and no report that the thermal insulation property of the building material is improved by adopting the graphene is reported.
Disclosure of Invention
It is an object of the present invention to provide a concrete article which has good thermal insulation properties.
Another object of the present invention is to provide a method for preparing a concrete product, which is suitable for mass production and can obtain a concrete product with good heat insulation performance.
The invention provides a concrete product which is prepared from the following raw materials:
50 to 100 parts by weight of cement,
25-55 parts of fly ash by weight,
2-10 parts by weight of graphene,
50 to 100 parts by weight of water,
3 to 8 parts by weight of a foaming agent,
0.5 to 5 parts by weight of a foam stabilizer,
0.5 to 2 parts by weight of an early strength agent, and
0.5-3 parts of a water reducing agent.
According to the concrete product of the invention, preferably, the concrete product is prepared by adopting the following raw materials:
60 to 80 parts by weight of cement,
30-35 parts by weight of fly ash,
5-8 parts by weight of graphene,
50-80 parts by weight of water,
3 to 5 parts by weight of a foaming agent,
1-3 parts by weight of a foam stabilizer,
0.6 to 1 part by weight of an early strength agent, and
0.6-1 part by weight of a water reducing agent.
According to the concrete product of the invention, preferably, the graphene has a purity of not less than 98%, a width of not more than 15 μm and a thickness of 1-3 nm.
According to the concrete product of the present invention, preferably, the cement is selected from one or more of portland cement, aluminate cement, sulphoaluminate cement, ferro-aluminate cement, fluoroaluminate cement, and phosphate cement.
According to the concrete product of the invention, preferably, the foaming agent is selected from one or more of hydrogen peroxide, sodium bicarbonate, ammonium carbonate, azodicarbonamide or azodiisobutyronitrile.
According to the concrete product of the invention, preferably, the foam stabilizer is selected from one or more of silicone amide, dodecyl dimethyl amine oxide, alkyl alcohol amide, polyacrylamide, polyvinyl alcohol, cellulose and protein; the early strength agent is selected from one or more of calcium chloride, potassium chloride, sodium sulfate, calcium thiosulfate, triethanolamine or triisopropanolamine; the water reducing agent is selected from one or more of magnesium lignosulfonate, sodium lignosulfonate, melamine formaldehyde resin and a naphthalene-containing water reducing agent.
Preferably, the concrete article according to the invention, the cement is portland cement; the foaming agent is hydrogen peroxide; the foam stabilizer is silicone amide; the early strength agent is triethanolamine; and the water reducing agent is sodium lignosulfonate.
According to the concrete product, the volume weight of the concrete product is preferably 500-800 kg/m3The compression strength is 8-12 MPa, the heat conductivity coefficient is 0.035-0.045W/m.K, the volume water absorption is less than or equal to 10%, and the fire-proof grade is A1 grade.
The invention also provides a preparation method of the concrete product, which comprises the following steps:
(1) dispersing graphene in a portion of water to form a graphene nanodispersion;
(2) uniformly mixing cement, fly ash and the graphene nano dispersion to obtain a premix; then adding a foaming agent, a foam stabilizer, an early strength agent, a water reducing agent and the balance of water into the premix, and uniformly mixing to obtain slurry; pouring the slurry into a mold for molding, standing for foaming, demolding and maintaining to form the concrete product.
According to the preparation method provided by the invention, preferably, the standing foaming time is 8-25 h, and the curing time is 8-28 days.
According to the invention, graphene is uniformly dispersed in a concrete matrix, heterogeneous nucleation is performed, and the foaming closed-cell rate and the pore size are adjusted, so that the microstructure of a concrete product is regulated and controlled, and the heat insulation performance of the concrete product is obviously improved.
Detailed Description
The present invention will be further described with reference to the following specific examples, but the scope of the present invention is not limited thereto.
< concrete product >
The concrete product of the invention includes but is not limited to a self-heat-insulating concrete product. The concrete product is prepared from the following raw materials: 50-100 parts of cement, 25-55 parts of fly ash, 2-10 parts of graphene, 50-100 parts of water, 3-8 parts of foaming agent, 0.5-5 parts of foam stabilizer, 0.5-2 parts of early strength agent and 0.5-3 parts of water reducing agent. According to one embodiment of the invention, the concrete article is made from raw materials comprising: 60-80 parts of cement, 30-35 parts of fly ash, 5-8 parts of graphene, 50-80 parts of water, 3-5 parts of foaming agent, 1-3 parts of foam stabilizer, 0.6-1 part of early strength agent and 0.6-1 part of water reducing agent. According to one embodiment of the invention, the concrete product is prepared from the following raw materials: 60 parts of cement, 30 parts of fly ash, 5 parts of graphene, 60 parts of water, 3 parts of foaming agent, 1.6 parts of foam stabilizer, 0.8 part of early strength agent and 0.6 part of water reducing agent. By adopting the raw materials in the range, the heat insulation performance of the concrete product can be obviously improved.
In the invention, the purity of the graphene can be not less than 98%, the width can be not more than 15 μm, and the thickness can be 1-3 nm. According to one embodiment of the present invention, the graphene of the present invention has a purity of 99% or more, a width of 3 to 8 μm, and a thickness of 2 nm. The graphene is more beneficial to improving the heat insulation performance of the concrete product. The graphene of the present invention can be obtained by a conventional method. For example, graphene is obtained from expandable flake graphite by Hummers method. The graphene of the present invention is not limited to graphene by Hummers method, and may be obtained by chemical vapor deposition, SiC epitaxial growth, electrochemistry, mechanical exfoliation, or the like.
In the invention, the cement is selected from one or more of Portland cement, aluminate cement, sulphoaluminate cement, ferro-aluminate cement, fluoroaluminate cement and phosphate cement. Preferably, the cement is selected from portland cement or aluminate cement.
In the present invention, the blowing agent may be selected from one or more of hydrogen peroxide, sodium bicarbonate, ammonium carbonate, azodicarbonamide, or azobisisobutyronitrile. Hydrogen peroxide is preferable from the viewpoint of improving the heat insulating property.
In the present invention, the foam stabilizer may be selected from one or more of silicone amide, dodecyl dimethyl amine oxide, alkylolamide, polyacrylamide, polyvinyl alcohol, cellulose, and protein. The protein of the present invention may be an animal protein or a plant protein. The foam stabilizer of the present invention is preferably selected from the group consisting of silicone amide, dodecyl dimethyl amine oxide, polyvinyl alcohol; more preferably a silicone amide. The early strength agent can be one or more selected from calcium chloride, potassium chloride, sodium sulfate, calcium thiosulfate, triethanolamine or triisopropanolamine; preferably triethanolamine. The water reducing agent can be one or more selected from magnesium lignosulfonate, sodium lignosulfonate, melamine formaldehyde resin and naphthalene-containing water reducing agent; preferably magnesium lignosulfonate or sodium lignosulfonate. The components are adopted, so that the heat insulation performance of the concrete product is improved.
According to one embodiment of the invention, the cement is portland cement; the foaming agent is hydrogen peroxide; the foam stabilizer is silicone amide; the early strength agent is triethanolamine; and the water reducing agent is sodium lignosulfonate. By adopting the raw materials, the heat insulation performance of the concrete product is better. According to one embodiment of the invention, the concrete product of the invention is prepared from the following raw materials: 60 parts of portland cement, 30 parts of fly ash, 60 parts of water, 5 parts of graphene, 3 parts of hydrogen peroxide, 1.6 parts of silicone amide, 0.8 part of triethanolamine and 0.6 part of sodium lignosulfonate.
The volume weight of the concrete product can be 500-800 kg/m3The compression strength is 8-12 MPa, the heat conductivity coefficient is 0.035-0.045W/m.K, the volume water absorption is less than or equal to 10%, and the fire-proof grade is A1 grade. Preferably, the volume weight of the concrete product is 700-800 kg/m3The high-strength concrete has the compression strength of 9-11 MPa, the heat conductivity coefficient of 0.040-0.045W/m.K, the volume water absorption rate of less than or equal to 9.5 percent and the fire-proof grade of A1. The volume weight has a meaning well known in the art and will not be described in detail herein.
< preparation method >
The preparation method of the concrete product comprises the following steps:
(1) dispersing graphene in a portion of water to form a graphene nanodispersion;
(2) uniformly mixing cement, fly ash and the graphene nano dispersion to obtain a premix; then adding a foaming agent, a foam stabilizer, an early strength agent, a water reducing agent and the balance of water into the premix, and uniformly mixing to obtain slurry; pouring the slurry into a mold for molding, standing for foaming, demolding and maintaining to form the concrete product.
In step (1) of the present invention, the graphene may be dispersed using a conventional method. For example, graphene is mixed with a part of water, and then ultrasonic dispersion is performed, thereby obtaining a uniformly dispersed graphene nanodispersion. The amount of graphene used is as described above and will not be described herein.
In the step (2) of the present invention, the above mixing sequence is adopted, such that the uniform dispersion degree of graphene in the concrete matrix can be improved, and the thermal insulation performance can be improved. The types and the amounts of the raw materials are as described above, and the description is omitted here. The mixing method is not particularly limited. For example, these raw materials are stirred in a high-speed stirrer. The mould is determined according to actual needs.
In the step (2), the standing foaming time can be controlled within 8-25 h, preferably 12-20 h. The curing time can be controlled within 8-28 days, preferably 10-15 days. Such condition control can improve the thermal insulation performance of the concrete product.
"parts by weight" in the following examples and comparative examples means parts by weight unless otherwise specified.
The graphene in the following embodiment has the purity of not less than 98%, the width of not more than 15 μm and the thickness of 1-3 nm, cement is portland cement, a foaming agent is hydrogen peroxide, a foam stabilizer is silicone amide, an early strength agent is triethanolamine, and a water reducing agent is sodium lignosulfonate.
The finished products in the following examples and comparative examples were tested as follows:
the volume weight is measured by GB/T50081-2016; the compressive strength and the volume water absorption are measured by JC/T2125-2012; the heat conductivity coefficient is determined by GB/T10294-; the combustion performance is measured by GB/T5464-.
Example 1
Mixing 5 parts by weight of graphene with 10 parts by weight of water, and carrying out ultrasonic treatment to obtain the graphene nano dispersion. Stirring and mixing 60 parts by weight of cement, 30 parts by weight of fly ash and the graphene nano dispersion by using a high-speed stirrer, adding a mixed solution of 3 parts by weight of foaming agent, 1.6 parts by weight of foam stabilizer, 0.8 part by weight of early strength agent, 0.6 part by weight of water reducing agent and 50 parts by weight of water, stirring at a high speed to obtain slurry, pouring the slurry into a mold for molding, standing and foaming for 12 hours, demolding, and maintaining for 12 days to obtain a concrete product, wherein the surface of the product needs to be kept moist during maintenance, so that the final strength of the product is ensured.
The concrete product has a volume weight of 700kg/m3The compression strength is 9MPa, the thermal conductivity is 0.045W/m.k, the volume water absorption is 9.5 percent, and the fire-proof rating is A1.
Comparative example 1
Stirring and mixing 60 parts by weight of cement and 30 parts by weight of fly ash by a high-speed stirrer, adding a mixed solution of 3 parts by weight of foaming agent, 1.6 parts by weight of foam stabilizer, 0.8 part by weight of early strength agent, 0.6 part by weight of water reducing agent and 60 parts by weight of water, stirring at a high speed to obtain slurry, pouring the slurry into a mold for molding, standing and foaming for 12 hours, demolding, and maintaining for 12 days to obtain a concrete product, wherein the surface of the product is kept moist during the maintenance period, so that the final strength of the product is ensured.
The concrete product has a volume weight of 700kg/m3The compression strength is 8.5MPa, the thermal conductivity is 0.11W/m.k, the volume water absorption is 10 percent, and the fire-proof rating is A1.
The present invention is not limited to the above-described embodiments, and any variations, modifications, and substitutions which may occur to those skilled in the art may be made without departing from the spirit of the invention.
Claims (5)
1. The concrete product is characterized by being prepared from the following raw materials:
60 parts by weight of cement, namely,
30 parts by weight of fly ash,
5 parts by weight of graphene, namely 5 parts by weight of graphene,
60 parts by weight of water, namely,
3 parts by weight of a foaming agent,
1.6 parts by weight of a foam stabilizer,
0.8 part by weight of an early strength agent, and
0.6 part of water reducing agent;
wherein the purity of the graphene is not less than 98%, the width of the graphene is 3-8 mu m, and the thickness of the graphene is 1-3 nm; the foaming agent is hydrogen peroxide; the foam stabilizer is silicone amide; the early strength agent is triethanolamine; the water reducing agent is sodium lignosulphonate.
2. The concrete article as claimed in claim 1, wherein the cement is selected from one or more of portland cement, aluminate cement, sulphoaluminate cement, ferro-aluminate cement, fluoroaluminate cement, phosphate cement.
3. The concrete product according to any one of claims 1 to 2, wherein the concrete product has a bulk density of 500 to 800kg/m3The compression strength is 8-12 MPa, the heat conductivity coefficient is 0.035-0.045W/m.K, the volume water absorption is less than or equal to 10%, and the fire-proof grade is A1 grade.
4. A method of making a concrete article according to any one of claims 1 to 3 comprising the steps of:
(1) dispersing graphene in a portion of water to form a graphene nanodispersion;
(2) uniformly mixing cement, fly ash and the graphene nano dispersion to obtain a premix; then adding a foaming agent, a foam stabilizer, an early strength agent, a water reducing agent and the balance of water into the premix, and uniformly mixing to obtain slurry; pouring the slurry into a mold for molding, standing for foaming, demolding and maintaining to form the concrete product.
5. The method according to claim 4, wherein the standing foaming time is 8 to 25 hours, and the curing time is 8 to 28 days.
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108069665A (en) * | 2018-01-24 | 2018-05-25 | 威海南海碳材料科技研究院有限公司 | A kind of graphene concrete and its preparation process |
| CN108383413B (en) * | 2018-03-14 | 2020-02-14 | 扬州工业职业技术学院 | Novel light compression-resistant foam concrete and preparation method thereof |
| CN108383414B (en) * | 2018-03-14 | 2020-01-31 | 殷成胜 | novel foaming agent and application thereof in preparation of foam concrete |
| GB201804261D0 (en) * | 2018-03-16 | 2018-05-02 | Univ Exeter | Graphene reinforced concrete |
| CN108585927A (en) * | 2018-07-13 | 2018-09-28 | 深圳中天精装股份有限公司 | A kind of nano-cellulose aerogel thermal insulation board and preparation method thereof |
| CN108821660A (en) * | 2018-07-25 | 2018-11-16 | 佛山陵朝新材料有限公司 | A kind of preparation method of air-entrained concrete building block |
| CN108947563A (en) * | 2018-09-07 | 2018-12-07 | 邢台禹神新型建筑材料有限公司 | Cellular concrete product and preparation method thereof |
| CN109384424A (en) * | 2018-11-19 | 2019-02-26 | 泸州时为节能科技有限公司 | A kind of cement foam board and preparation method thereof |
| CN109912283B (en) * | 2019-04-23 | 2021-02-23 | 台州普立德建筑科技有限公司 | Light prefabricated component flier |
| CN110180515A (en) * | 2019-06-27 | 2019-08-30 | 中素新科技有限公司 | Graphene oxide and polyamines class water-soluble polymer complex and its preparation method and application |
| AU2020310951A1 (en) * | 2019-07-08 | 2022-02-10 | Alter Biota Inc. | Preparation of hydrous graphene oxide for use as a concrete admixture |
| CN110642546B (en) * | 2019-10-25 | 2022-04-29 | 菲大装配式建筑工程(重庆)有限责任公司 | Graphene aerated concrete additive, preparation method thereof and graphene aerated concrete |
| CN110615432B (en) * | 2019-10-25 | 2021-07-13 | 菲大装配式建筑工程(重庆)有限责任公司 | Graphene slurry, preparation method thereof and graphene aerated concrete |
| CN110642547B (en) * | 2019-10-25 | 2022-05-27 | 菲大装配式建筑工程(重庆)有限责任公司 | Graphene slurry and graphene aerated concrete |
| CN110803901A (en) * | 2019-12-06 | 2020-02-18 | 山东领军新材料科技有限公司 | Production process for preparing aggregate-free concrete pile building block from graphene slag |
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| CN105622161B (en) * | 2016-02-18 | 2018-04-20 | 陕西科技大学 | Cement base foamed light composite material and preparation method |
| CN106000315B (en) * | 2016-07-20 | 2018-10-30 | 陕西科技大学 | The preparation method of light cement base graphene oxide composite adsorption material |
| CN107140896A (en) * | 2017-07-12 | 2017-09-08 | 合肥雅克丽新型建材有限公司 | A kind of concrete and preparation method thereof |
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