CN115536328B - Foam concrete with high stability and preparation method thereof - Google Patents
Foam concrete with high stability and preparation method thereof Download PDFInfo
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- CN115536328B CN115536328B CN202211029196.8A CN202211029196A CN115536328B CN 115536328 B CN115536328 B CN 115536328B CN 202211029196 A CN202211029196 A CN 202211029196A CN 115536328 B CN115536328 B CN 115536328B
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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
- 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
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
- C04B2201/30—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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- 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 provides foam concrete with high stability and a preparation method thereof, wherein each cubic meter comprises the following raw materials by weight: 210-270kg of cement, 0.5-1.6kg of foaming agent, 10-20kg of fly ash, 100-140kg of water and 1-3kg of heat-resistant agent, wherein the heat-resistant agent consists of hectorite clay, acidic silica sol, brucite fiber dispersion liquid and expanded graphite. According to the invention, cement, a foaming agent, fly ash, water and a heat-resistant agent in a certain proportion are selected, and the heat-resistant agent composed of hectorite clay, acidic silica sol, brucite fiber dispersion liquid and expanded graphite in a certain proportion is combined, so that the phenomenon of drying shrinkage caused by internal factors is effectively avoided, the maximum deformation range of foam concrete is kept, the shock resistance and stability of the foam concrete are improved, the consumption of cement, the foaming agent and the fly ash is reduced, and the foam concrete is environment-friendly and controllable in quality.
Description
Technical Field
The invention relates to the field of foam concrete, in particular to foam concrete with high stability and a preparation method thereof.
Background
Foam concrete, also called bubble concrete, is a lightweight filled concrete material containing a large number of closed pores, which is formed by uniformly mixing a foaming agent and cement slurry through a foaming system, performing cast-in-place construction or mold forming through a pumping system, and curing under certain conditions. In recent years, physical properties such as porosity, fluidity, water absorption and the like of foam concrete have been receiving extensive attention from researchers, particularly energy absorption and buffering properties. Therefore, the static and dynamic mechanical properties and energy absorption properties of foam concrete are studied more in the prior art.
The brucite fiber has been found to have obvious improvement on the road performance of asphalt and asphalt mixture, and the research shows that hectorite can partially replace cellulose ethers, so that the workability and thixotropic property of special mortar are improved, the impermeability of the mortar can be improved, and the brucite fiber is an ideal and efficient mineral rheological aid. However, the prior art lacks the use of brucite fibers and hectorite for the preparation of foam concrete.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a foam concrete with high stability and a preparation method thereof.
The technical scheme of the invention is realized as follows:
a foam concrete with high stability performance comprises the following raw materials by weight per cubic meter: 210-270kg of cement, 0.5-1.6kg of foaming agent, 10-20kg of fly ash, 100-140kg of water and 1-3kg of heat-resistant agent, wherein the heat-resistant agent consists of water-based hectorite clay, acidic silica sol, brucite fiber dispersion liquid and expanded graphite.
The further proposal is that each cubic meter comprises the following raw materials by weight: 240-270kg of cement, 0.8-1.2kg of foaming agent, 10kg of fly ash, 120kg of water and 2kg of heat-resistant agent, wherein the heat-resistant agent comprises the following components in percentage by mass of 1-2:1-3:1-3:0.5-1.5 of water-based hectorite clay, acidic silica sol, brucite fiber dispersion liquid and expanded graphite.
Further, each cubic meter comprises the following raw materials by weight: 240-270kg of cement, 0.8-1.2kg of foaming agent, 10kg of fly ash, 120kg of water and 2kg of heat-resistant agent, wherein the heat-resistant agent comprises the following components in percentage by mass of 1-2:1-2:2:0.5 of an aqueous hectorite clay, an acidic silica sol, a brucite fiber dispersion and expanded graphite.
Further, the hectorite clay particles have a particle size of 5-10 μm.
The brucite fiber dispersion liquid is obtained by adding polyurethane solution into preheated brucite fibers, stirring, ultrasonic dispersing and homogenizing.
In a further scheme, the mass ratio of the brucite fiber to the polyurethane solution is 1:5-6; the solid content of the polyurethane solution is 50-60%; the brucite fiber is preheated to 110-130 ℃; the stirring time is 1-2h, the ultrasonic dispersion time is 1-5h, the homogenizing pressure is 900-1200bar, and the homogenizing time is 30-50min.
The preparation method of the foam concrete comprises the following preparation steps:
s1, preparing slurry: weighing cement, foaming agent, fly ash, water and heat-resistant agent according to the weight parts; adding water accounting for 35-40% of the total weight of the formula water into cement and fly ash, and stirring to obtain slurry;
s2, preparing foaming liquid: mixing the rest water with a foaming agent to obtain a foaming liquid;
s3, preparing a mixture: mixing the slurry with the foaming liquid, preheating, adding a heat-resisting agent, and stirring to obtain a mixture;
s4, foam concrete: pouring and curing the mixture to obtain the foam concrete.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, cement, a foaming agent, fly ash, water and a heat-resistant agent in a certain proportion are selected, and the heat-resistant agent composed of hectorite clay, acidic silica sol, brucite fiber dispersion liquid and expanded graphite in a certain proportion is combined, so that the phenomenon of drying shrinkage caused by internal factors is effectively avoided, the maximum deformation range of foam concrete is kept, the shock resistance and stability of the foam concrete are improved, the consumption of cement, the foaming agent and the fly ash is reduced, and the foam concrete is environment-friendly and controllable in quality.
In addition, the hectorite clay with the particle size of 5-10 mu m has small-piece-shaped particles, on one hand, the hectorite clay has better swelling property and rheological property, on the other hand, in the brucite fiber dispersion liquid, in the cement hydration process, the hectorite clay also has partial hydration reaction, more hydration layers are formed between the layers of the sheet, ions of the hectorite clay can also stimulate the hydration reaction of the cement, the intensity of the hydration reaction can be weakened, and the release of hydration heat is reduced; however, hectorite clay has poor water retention property, and can reduce the bleeding rate of slurry by introducing acidic silica sol and expanded graphite, and meanwhile, the acidic silica sol and the expanded graphite can also be used for filling the slurry, so that the foam stability is improved; the brucite fiber dispersion liquid is introduced, so that the dispersibility of components in the concrete is improved when the release of hydration heat is reduced, aggregation of components such as brucite fibers, hectorite clay and the like is avoided, the test piece is formed unevenly, and the stability and shock resistance are reduced.
The heat-resistant agent composed of the water-based hectorite clay, the acidic silica sol, the brucite fiber dispersion liquid and the expanded graphite is mutually synergistic, and the cement slurry and the foaming liquid are doped, so that the hydration reaction is slowed down, the highest temperature rise time of the heat of hydration is delayed, the heat release of the heat of hydration is uniform, and the later strength of a test piece is improved.
Drawings
FIG. 1 is a stress-strain curve of the foam concrete test piece of example 3.
Detailed Description
In order to better understand the technical content of the present invention, the following provides specific examples to further illustrate the present invention.
The experimental methods used in the embodiment of the invention are conventional methods unless otherwise specified.
Materials, reagents, and the like used in the examples of the present invention are commercially available unless otherwise specified.
The cement of the invention is P.O42.5 grade cement, and the fly ash is I grade fly ash.
Measuring the heat of hydration according to GB/T12959-2008 method for measuring heat of hydration of Cement; the thermal conductivity is determined according to GB/T10294-2008 heat insulation material steady state thermal resistance and related characteristic determination guard Hot plate method. And curing the molded test piece at the temperature of 22+/-2 ℃ and the relative humidity of 90% until 28d, and taking out to obtain a foam concrete test piece which is used for measuring the performance, wherein the foam concrete without the heat-resisting agent is used as a control group.
The stress-strain experiment adopts an Shimadzu AGX-250 electronic universal tester to test the compressive strength of a foam concrete test piece, the set speed is 0.01mm/S, the compressive strength F (MPa) =P/S of the test piece, wherein P is the damage load (N) applied to the test piece during the final damage, and S is the stress area (mm) of the test piece 2 )。
Example 1
A foam concrete with high stability performance comprises the following raw materials by weight per cubic meter: 210kg of cement, 0.5kg of foaming agent, 10kg of fly ash, 100kg of water and 1kg of heat-resistant agent;
wherein, the heat-resistant agent comprises the following components in percentage by mass: 1:1:0.5 of hectorite clay with particle size of 5-10 mu m, acidic silica sol, brucite fiber dispersion liquid and expanded graphite.
The preparation method of the brucite fiber dispersion liquid comprises the following steps: the mass ratio is 1:5, adding polyurethane solution with the solid content of 55% into brucite fibers preheated to 120 ℃, stirring for 1h, dispersing for 5h by ultrasonic, homogenizing for 40min at a homogenizing pressure of 1000bar, and obtaining brucite fiber dispersion liquid.
Example 2
A foam concrete with high stability performance comprises the following raw materials by weight per cubic meter: 270kg of cement, 1.6kg of foaming agent, 20kg of fly ash, 140kg of water and 3kg of heat-resistant agent;
wherein the heat-resistant agent comprises the following components in percentage by mass: 3:3:1.5, hectorite clay with particle size of 5-10 μm, acidic silica sol, brucite fiber dispersion liquid and expanded graphite.
The preparation method of the brucite fiber dispersion liquid comprises the following steps: the mass ratio is 1: and 6, adding a polyurethane solution with the solid content of 55% into brucite fibers preheated to 120 ℃, stirring for 2 hours, dispersing by ultrasonic for 2 hours, and homogenizing for 30 minutes at a homogenizing pressure of 1200bar to obtain brucite fiber dispersion liquid.
Example 3
A foam concrete with high stability performance comprises the following raw materials by weight per cubic meter: 260kg of cement, 1kg of foaming agent, 10kg of fly ash, 120kg of water and 2kg of heat-resistant agent;
wherein the heat-resistant agent comprises the following components in percentage by mass: 2:2:1, hectorite clay with particle size of 5-10 mu m, acidic silica sol, brucite fiber dispersion liquid and expanded graphite.
The preparation method of the brucite fiber dispersion liquid comprises the following steps: the mass ratio is 1: and 6, adding a polyurethane solution with the solid content of 55% into brucite fibers preheated to 120 ℃, stirring for 2 hours, dispersing by ultrasonic for 2 hours, homogenizing for 40 minutes at a homogenizing pressure of 1000bar, and thus obtaining brucite fiber dispersion liquid.
Example 4
A foam concrete with high stability performance comprises the following raw materials by weight per cubic meter: 240kg of cement, 0.8kg of foaming agent, 10kg of fly ash, 120kg of water and 2kg of heat-resistant agent;
wherein the heat-resistant agent comprises the following components in percentage by mass: 1:2:0.5 of hectorite clay with particle size of 5-10 mu m, acidic silica sol, brucite fiber dispersion liquid and expanded graphite.
The preparation method of the brucite fiber dispersion liquid comprises the following steps: the mass ratio is 1: and 6, adding a polyurethane solution with the solid content of 55% into brucite fibers preheated to 120 ℃, stirring for 2 hours, dispersing by ultrasonic for 2 hours, homogenizing for 40 minutes at a homogenizing pressure of 1000bar, and thus obtaining brucite fiber dispersion liquid.
Comparative example 1
A foam concrete with high stability performance comprises the following raw materials by weight per cubic meter: 240kg of cement, 0.8kg of foaming agent, 10kg of fly ash, 120kg of water and 2kg of heat-resistant agent;
wherein, the heat-resistant agent comprises the following components in percentage by mass: 2:0.5 of acidic silica sol, brucite fiber dispersion liquid and expanded graphite.
The preparation method of the brucite fiber dispersion liquid comprises the following steps: the mass ratio is 1: and 6, adding a polyurethane solution with the solid content of 55% into brucite fibers preheated to 120 ℃, stirring for 2 hours, dispersing by ultrasonic for 2 hours, homogenizing for 40 minutes at a homogenizing pressure of 1000bar, and thus obtaining brucite fiber dispersion liquid.
Comparative example 2
A foam concrete with high stability performance comprises the following raw materials by weight per cubic meter: 240kg of cement, 0.8kg of foaming agent, 10kg of fly ash, 120kg of water and 2kg of heat-resistant agent;
wherein the heat-resistant agent comprises the following components in percentage by mass: 1:0.5 of hectorite clay with particle size of 5-10 mu m, acidic silica sol and expanded graphite.
Comparative example 3
A foam concrete with high stability performance comprises the following raw materials by weight per cubic meter: 240kg of cement, 0.8kg of foaming agent, 10kg of fly ash, 120kg of water and 2kg of heat-resistant agent;
wherein the heat-resistant agent comprises the following components in percentage by mass: 2, a hectorite clay with a particle size of 5-10 mu m and brucite fiber dispersion liquid.
The preparation method of the brucite fiber dispersion liquid comprises the following steps: the mass ratio is 1: and 6, adding a polyurethane solution with the solid content of 55% into brucite fibers preheated to 120 ℃, stirring for 2 hours, dispersing by ultrasonic for 2 hours, homogenizing for 40 minutes at a homogenizing pressure of 1000bar, and thus obtaining brucite fiber dispersion liquid.
The preparation method of the foam concrete test pieces of the above examples 1-4 and comparative examples 1-3 comprises the following preparation steps:
s1, preparing slurry: weighing cement, foaming agent, fly ash, water and heat-resistant agent according to the weight parts; adding water accounting for 35-40% of the total weight of the formula water into cement and fly ash, and stirring to obtain slurry;
s2, preparing foaming liquid: mixing the rest water with a foaming agent to obtain a foaming liquid;
s3, preparing a mixture: mixing the slurry with the foaming liquid, preheating, adding a heat-resisting agent, and stirring to obtain a mixture;
s4, testing a test piece: pouring the mixture into a mould for molding, wherein the test piece is 100mm multiplied by 100mm in size, and obtaining the test piece.
The experimental results of the above experimental test pieces are shown in table 1 below.
Table 1 test pieces hydration heat at different times
As is clear from the above table, the heat of hydration of the test pieces in examples 1 to 4 is 18.6 to 22.7J.g at 18h -1 Rising to 42.3-45.2 J.g in 36h -1 The heat of hydration of cement is increased sharply in the period of 0-20h from the beginning of hydration, the heat of hydration is lower in 18h and is increased slowly in 36h, which shows that the heat-resistant agent composed of water-based hectorite clay, acidic silica sol, brucite fiber dispersion liquid and expanded graphite with specific proportion is adopted to cooperate with each other, and cement slurry and foaming liquid are doped to slow down the hydration reaction and delay the most heat of hydrationThe high temperature rise time ensures that the hydration heat releases heat evenly, and is beneficial to improving the later strength of the test piece.
Test pieces the test results of the cured foam concrete test pieces are shown in Table 2 below.
Table 2 thermal conductivity and shrinkage of foam concrete test pieces 28d
| Project | Thermal conductivity/W (m.g) -1 ) | Shrinkage/% |
| Example 3 | 0.082 | 0.32 |
| Example 4 | 0.087 | 0.36 |
| Control group | 0.077 | 0.51 |
As can be seen from the above table, compared with the control group, the thermal conductivity of the invention in examples 3-4 is improved by 6.5% and 13%, the shrinkage is reduced by 37% and 29%, respectively, which shows that the thermal inhibitor composed of the aqueous hectorite clay, the acidic silica sol, the brucite fiber dispersion liquid and the expanded graphite is adopted, so that the shrinkage deformation rate of the foam concrete can be reduced, the stability of the foam concrete is improved, and the drying shrinkage phenomenon caused by internal factors is effectively avoided.
As can be seen from fig. 1, in example 3, when the strain reaches the peak value, a more gentle drop curve is provided, which indicates that the residual stress is larger in the strain range, which is helpful to maintain the maximum deformation range of the foam concrete, and effectively improves the shock resistance and stability of the foam concrete.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (4)
1. The foam concrete with high stability is characterized by comprising the following raw materials in parts by weight per cubic meter: 240-270kg of cement, 0.8-1.2kg of foaming agent, 10kg of fly ash, 120kg of water and 2kg of heat-resistant agent, wherein the heat-resistant agent comprises the following components in percentage by mass of 1-2:1-3:1-3:0.5-1.5 hectorite clay, acidic silica sol, brucite fiber dispersion and expanded graphite;
the brucite fiber dispersion liquid is obtained by adding polyurethane solution into preheated brucite fibers, stirring, ultrasonic dispersing and homogenizing;
the mass ratio of the brucite fiber to the polyurethane solution is 1:5-6; the solid content of the polyurethane solution is 50-60%; the brucite fiber is preheated to 110-130 ℃; the stirring time is 1-2h, the ultrasonic dispersion time is 1-5h, the homogenizing pressure is 900-1200bar, and the homogenizing time is 30-50min.
2. The foam concrete with high stability according to claim 1, wherein each cubic meter comprises the following raw materials by weight: 260kg of cement, 1kg of foaming agent, 10kg of fly ash, 120kg of water and 2kg of heat-resistant agent; the heat-resistant agent comprises the following components in percentage by mass: 2:2:1, an acidic silica sol, a brucite fiber dispersion and expanded graphite.
3. A high stability foam concrete according to claim 1, wherein the hectorite clay particles have a particle size of 5-10 μm.
4. A method of producing a foam concrete according to any one of claims 1 to 3, comprising the steps of:
s1, preparing slurry: weighing cement, foaming agent, fly ash, water and heat-resistant agent according to the weight parts; adding water accounting for 35-40% of the total weight of the formula water into cement and fly ash, and stirring to obtain slurry;
s2, preparing foaming liquid: mixing the rest water with a foaming agent to obtain a foaming liquid;
s3, preparing a mixture: mixing the slurry with the foaming liquid, preheating, adding a heat-resisting agent, and stirring to obtain a mixture;
s4, foam concrete: pouring and curing the mixture to obtain the foam concrete.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101811884A (en) * | 2010-04-02 | 2010-08-25 | 建研建材有限公司 | High-performance foam concrete and preparation method thereof |
| CN107009484A (en) * | 2017-04-25 | 2017-08-04 | 天津和兴源建筑工程有限公司 | A kind of preparation method of high performance concrete Self-heat-insulation composite building block |
| CN108793887A (en) * | 2018-07-26 | 2018-11-13 | 上海石化安东混凝土有限公司 | A kind of mass concrete and preparation method thereof |
| CN110041025A (en) * | 2019-04-04 | 2019-07-23 | 广西建工集团冶金建设有限公司 | A kind of ameliorative mass concrete and preparation method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101811884A (en) * | 2010-04-02 | 2010-08-25 | 建研建材有限公司 | High-performance foam concrete and preparation method thereof |
| CN107009484A (en) * | 2017-04-25 | 2017-08-04 | 天津和兴源建筑工程有限公司 | A kind of preparation method of high performance concrete Self-heat-insulation composite building block |
| CN108793887A (en) * | 2018-07-26 | 2018-11-13 | 上海石化安东混凝土有限公司 | A kind of mass concrete and preparation method thereof |
| CN110041025A (en) * | 2019-04-04 | 2019-07-23 | 广西建工集团冶金建设有限公司 | A kind of ameliorative mass concrete and preparation method thereof |
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