CN114988912A - Preparation method of polymer foam concrete for filling cold-formed thin-wall steel - Google Patents
Preparation method of polymer foam concrete for filling cold-formed thin-wall steel Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/006—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 mineral polymers, e.g. geopolymers of the Davidovits type
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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
- C04B12/00—Cements not provided for in groups C04B7/00 - C04B11/00
- C04B12/005—Geopolymer cements, e.g. reaction products of aluminosilicates with alkali metal hydroxides or silicates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a preparation method of polymer foam concrete for filling cold-formed thin-walled steel, which comprises the following steps: s1 preparation of slurry: weighing dry materials according to parts by weight, taking 18-22 parts of slag micro powder, 32-36 parts of phospho aluminosilicate powder, 8-12 parts of sintered red mud, 6-9 parts of slaked lime and 13-15 parts of water glass, wherein the weight ratio of water to dry materials is 0.4-0.45, and preparing foam by S2; s3 preparing a geopolymer slurry; s4 casting and molding; and S5, curing. According to the preparation method of the geopolymer foam concrete, the distribution ratio is reasonably adjusted, and the process parameters are improved, so that the prepared geopolymer foam concrete is lighter in weight, higher in strength, good in sound insulation and fire resistance and strong in shock resistance, can be suitable for filling of cold-formed thin-walled steel, and has a promoting effect on the application of expanded geopolymer foam concrete.
Description
Technical Field
The invention relates to the technical field of combined filling of cold-formed thin-wall section steel and foam concrete, in particular to a preparation method of polymer foam concrete for filling cold-formed thin-wall section steel.
Background
Along with the rapid development of economy and the progress of society, the awareness of energy conservation and emission reduction of people is continuously improved, the attention on environmental protection is increased in various industries, particularly in the building industry, the use of various green and environment-friendly new materials for replacing traditional materials is the main trend at present, however, whether the new materials can reach the standard on various performance indexes is still to be studied, along with the continuous development of high-rise buildings, the load born by foundations and reinforced concrete is increasingly large, and the production of light and high-strength reinforced concrete materials is a problem needing to be considered and improved next step.
The concept of geopolymers was proposed in 1978 by the French nation Davidovits, a species of AlO 4 And SiO 4 The tetrahedral structural unit forms an inorganic polymer with a three-dimensional network structure, and the chemical formula is Mn { - (SiO) 2 )zAlO 2 }n·wH 2 O, amorphous to semi-crystalline, belonging to non-metallic materials. The material has excellent mechanical performance, acid and alkali resistance, fire resistance and high temperature resistance, has the characteristics of replacing common portland cement and utilizing mineral waste and construction waste as raw materials, and has application in the aspects of building materials, high-strength materials, solid core and solid waste materials, sealing materials, high temperature resistant materials and the like.
Patent CN106588107A discloses a geopolymer-based foam concrete, which comprises the following raw materials in parts by weight: 5-30 parts of bentonite micro powder, 3-28 parts of iron tailing slag micro powder, 2-15 parts of expanded vermiculite powder, 3-25 parts of alkali activator, 0.1-0.6 part of ecological fiber, 0.1-10 parts of foaming agent, 0.2-1.0 part of thickening agent and 5-25 parts of water. The foam concrete has toughness by utilizing the good stretch-proof deformation resistance and light specific gravity of the ecological fiber, and China has rich ecological plant resources, can save a large amount of resources and is beneficial to the living environment of human beings. By utilizing good grain gradation of the bentonite micro powder, the fly ash, the iron tailing slag micro powder and the expanded vermiculite powder, the effect of micro-aggregate can be well played, and the strength and the durability of the foam concrete product are improved. However, the geopolymer-based foam concrete is slightly easy to prepare, and the prepared concrete is easy to have high water absorption rate and may have the problem of air holes inside.
Disclosure of Invention
Aiming at the problems, the invention provides a preparation method of polymer foam concrete for filling cold-formed thin-walled steel.
The technical scheme of the invention is as follows:
a preparation method of polymer foam concrete for filling cold-formed thin-walled steel comprises the following steps:
s1 preparation of slurry: weighing dry materials according to parts by weight, wherein the dry materials comprise 18-22 parts of slag micro powder, 32-36 parts of phospho aluminosilicate powder, 8-12 parts of sintered red mud, 6-9 parts of hydrated lime and 13-15 parts of water glass, the weight ratio of water to water ash of the dry materials is 0.4-0.45, weighing and stirring the slag micro powder, the phospho aluminosilicate powder, the sintered red mud and the hydrated lime according to the proportion for 5-10min, then weighing and stirring the water glass and the water for 5-10min, and mixing to obtain mixed slurry;
s2 preparation of foam: mixing and stirring the composite foaming agent and water in a high-pressure container for 15-20min according to the mass ratio of 1:13.5-15.5, and introducing supercritical CO while stirring 2 Maintaining the temperature at 42-46 ℃ and the pressure at 9-12MPa to obtain foam, wherein the total amount of the composite foaming agent and the water is 3-4 parts by weight;
s3 preparation of polymer slurry: pouring the foam obtained in the step S2 into the mixed slurry obtained in the step S1, and mixing and stirring for 20-30min to obtain geopolymer foam slurry;
s4 casting molding: pouring the geopolymer foam slurry obtained in the step S3 into a mould, placing the mould under a vacuum condition, simultaneously and manually vibrating for 5-10min, and then standing for 1h under the vacuum condition;
s5 maintenance: and (2) putting the mould into a curing room for curing treatment, adjusting the room temperature to 25 +/-3 ℃, adjusting the relative humidity to 85-90%, covering a layer of wet cloth soaked with curing liquid above the mould for moisturizing, standing for 24h, then demoulding to obtain a geopolymer test piece, wrapping the geopolymer test piece with a plastic film, and then placing the geopolymer test piece at the temperature of 60-65 ℃ for continuous curing for 3d to obtain a concrete test piece.
Further, in the step S1, the slag micro powder comprises the following components in percentage by mass: SiO 2 2 30-35％，CaO 32-34％，Al 2 O 3 17-23%, MgO 7-9%, and Fe in balance 2 O 3 The average particle size of the fine slag powder is 30 to 40 μm. The slag micropowder is one of main raw materials for preparing geopolymer foam concrete, and has good activity.
Further, the preparation method of the phospho-aluminosilicate powder in the step S1 specifically includes:
s1-1, preparing aluminum sol: mixing aluminum nitrate and absolute ethyl alcohol according to a molar ratio of 1:12, vacuumizing and stirring for 8 hours to obtain aluminum sol;
s1-2, preparing silica sol: mixing tetraethoxysilane and absolute ethyl alcohol according to a molar ratio of 1:6, vacuumizing and stirring for 8 hours to obtain silica sol;
s1-3, preparation of composite sol: pouring the aluminum sol obtained in the step S1-1 and the silica sol obtained in the step S1-2 into a phosphoric acid solution, wherein the molar ratio of the aluminum sol to the silica sol to the phosphoric acid solution is 2:3:5, and ultrasonically stirring for 2 hours to obtain a composite sol;
s1-4, preparing phospho aluminosilicate powder: and (4) carrying out rotary evaporation on the composite sol obtained in the step S1-3 for 1h to obtain wet gel, putting the wet gel into a high-temperature oven, heating to 650-700 ℃ at a heating rate of 80 ℃/h, preserving heat for 3h, naturally cooling to room temperature, discharging, and grinding until the average particle size is 20-30 mu m.
Further, in the step S1-3, the ultrasonic stirring power is 40kHz, and the stirring speed is 100 rpm. The stirring and dispersing effect is better.
Further, the modulus of the water glass in the step S1 is 2.4-2.6. Has strong acid resistance, strong binding power and good heat resistance, and has good performance as an alkali activator.
Further, in the step S2, the composite foaming agent comprises the following components in percentage by mass: 85-90% of fatty alcohol-polyoxyethylene ether sodium sulfate, 2-3% of sodium dodecyl benzene sulfonate and the balance of silicone polyether emulsion and supercritical CO 2 The injection amount of (2) was 0.08L/min. Good foaming effect, stable foam and large volume, and is prepared by adding supercritical CO 2 So that the bleeding amount and the subsidence amount of the foam are small.
Further, the stirring speed in step S1 is 200rpm, the stirring speed in step S2 is 400rpm, the stirring manner in step S3 is magnetic stirring, and the stirring speed is 300 rpm. The proper stirring speed is selected for different preparation processes to achieve the optimal stirring effect.
Further, the curing liquid in the step S5 comprises the following components in percentage by mass: 66% of paraffin emulsion and 34% of hydrogen peroxide with the mass concentration of 30%. The curing liquid is stable, does not need heating, does not contain organic solvent, and has low viscosity and good curing effect.
Furthermore, the paraffin emulsion comprises the following components in percentage by mass: 44-48% of solid paraffin, 0.5-2% of fatty alcohol-polyoxyethylene ether, 1-2% of linear polyacrylamide and the balance of deionized water. The obtained paraffin emulsion is nontoxic and odorless, and has high stability and low cost.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the preparation method of the geopolymer foam concrete, the distribution ratio is reasonably adjusted, and the process parameters are improved, so that the prepared geopolymer foam concrete is lighter in weight, higher in strength, good in sound insulation and fire resistance and strong in shock resistance, can be suitable for filling of cold-formed thin-wall section steel, and has a pushing effect on the application of expanded geopolymer foam concrete.
(2) The preparation method of the geopolymer foam concrete ensures the strength of the geopolymer foam concrete while achieving low cost by reasonably adjusting the component proportion, and researches the factors influencing the strength to obtain the most reasonable water-cement weight ratio and the content of each component.
(3) According to the preparation method of the geopolymer foam concrete, phosphate aluminosilicate powder is added, the preparation method of the phosphate aluminosilicate powder is improved, phosphoric acid is mixed with high-activity alumina sol and silica sol, and the activity of the aluminosilicate powder is excited by phosphoric acid solution, so that the compressive strength and the structural stability of the geopolymer foam concrete are further improved.
(4) The preparation method of the geopolymer foam concrete of the invention adds supercritical CO when preparing foam 2 The temperature and pressure of the reaction are controlled in a proper range, the foaming effect is good, the foam is stable and large in volume, and the bleeding amount and the subsidence amount of the foam are small.
Detailed Description
Example 1
A preparation method of polymer foam concrete for filling cold-formed thin-walled steel comprises the following steps:
s1 preparation of slurry: weighing dry materials according to parts by weight, wherein the dry materials comprise 20 parts of slag micro powder, 34 parts of phospho aluminosilicate powder, 10 parts of sintered red mud, 8 parts of hydrated lime and 14 parts of water glass, the weight ratio of water to ash of the dry materials is 0.4, and the slag micro powder comprises the following components in percentage by weight: SiO 2 2 33％，CaO33％，Al 2 O 3 20 percent of MgO 8 percent and the balance of Fe 2 O 3 The method comprises the following steps of weighing and stirring slag micro powder, phospho-aluminosilicate powder, sintered red mud and hydrated lime for 8min according to a ratio, wherein the stirring speed is 200rpm, then weighing and stirring water glass and water for 7min, the stirring speed is 200rpm, the modulus of the water glass is 2.5, and mixing to obtain mixed slurry;
s2 preparation of foam: mixing and stirring the composite foaming agent and water in a high-pressure container for 16min at a mass ratio of 1:14, wherein the stirring speed is 400rpm, the temperature is kept at 43 ℃, and the pressure is kept at 11MPa, so as to obtain foam, wherein the total amount of the composite foaming agent and water is 3.5 parts by weight, and the composite foaming agent comprises the following components in percentage by mass: 88 percent of fatty alcohol-polyoxyethylene ether sodium sulfate, 2.5 percent of sodium dodecyl benzene sulfonate and the balance of silicone polyether emulsion;
s3 preparation of polymer slurry: pouring the foam obtained in the step S2 into the mixed slurry obtained in the step S1, and mixing and stirring for 20-30min in a magnetic stirring mode at the stirring speed of 300rpm to obtain geopolymer foam slurry;
s4 casting molding: pouring the geopolymer foam slurry obtained in the step S3 into a mold, placing the mold under a vacuum condition, simultaneously manually vibrating for 9min, and then standing for 1h under the vacuum condition;
s5 maintenance: putting the mould into a curing room for curing treatment, adjusting the room temperature to 25 ℃, adjusting the relative humidity to 87%, covering a layer of wet cloth soaked with curing liquid above the mould for moisturizing, standing for 24 hours, then demoulding to obtain a geopolymer test piece, wrapping the geopolymer test piece with a plastic film, and then placing the geopolymer test piece at 62 ℃ for continuous curing for 3 days to obtain a concrete test piece, wherein the curing liquid comprises the following components in percentage by mass: 66% of paraffin emulsion, 34% of hydrogen peroxide with the mass concentration of 30%, and the paraffin emulsion comprises the following components in percentage by mass: 45% of solid paraffin, 1% of fatty alcohol-polyoxyethylene ether, 1.5% of linear polyacrylamide and the balance of deionized water.
Example 2
This embodiment is substantially the same as embodiment 1, except that: and step S1, the mixture ratio of each component in the prepared slurry is different.
S1 preparation of slurry: weighing dry materials according to parts by weight, wherein the dry materials comprise 18 parts of slag micro powder, 32 parts of phospho aluminosilicate powder, 12 parts of sintered red mud, 9 parts of hydrated lime and 15 parts of water glass.
Example 3
This embodiment is substantially the same as embodiment 1, except that: step S1 is to prepare slurry with different proportions of the components.
S1 preparation of slurry: weighing dry materials according to parts by weight, wherein the dry materials comprise 22 parts of slag micro powder, 36 parts of phospho aluminosilicate powder, 8 parts of sintered red mud, 6 parts of hydrated lime and 13 parts of water glass.
Example 4
This embodiment is substantially the same as embodiment 1, except that: step S1 produced a water-to-ash weight ratio of 0.42 for water to dry stock in the slurry.
Example 5
This embodiment is substantially the same as embodiment 1, except that: step S1 provides a water/ash weight ratio of 0.45 for water to dry stock in the prepared slurry.
Example 6
This embodiment is substantially the same as embodiment 1, except that: and step S1, the contents of all components of the slag micro powder in the slurry prepared in the step S1 are different in percentage by mass.
S1 preparation of slurry: the slag micro powder comprises the following components in percentage by mass: SiO 2 2 30％，CaO32％，Al 2 O 3 23 percent of MgO 9 percent and the balance of Fe 2 O 3 And unavoidable impurities, wherein the average particle size of the slag micro powder is 30 microns, and the slag micro powder, the phosphoaluminosilicate powder, the sintered red mud and the hydrated lime are weighed and stirred for 5min according to the proportion, and the stirring speed is 200 rpm.
Example 7
This embodiment is substantially the same as embodiment 1, except that: and step S1, the contents of all components of the slag micro powder in the slurry prepared in the step S1 are different in percentage by mass.
S1 preparation of slurry: the slag micro powder comprises the following components in percentage by mass: SiO 2 2 35％，CaO34％，Al 2 O 3 17%, MgO 7%, and the balance of Fe 2 O 3 And unavoidable impurities, wherein the average particle size of the slag micro powder is 40 mu m, and the slag micro powder, the phospho-aluminosilicate powder, the sintered red mud and the hydrated lime are weighed and stirred for 10min according to the proportion, and the stirring speed is 200 rpm.
Example 8
This embodiment is substantially the same as embodiment 1, except that: the modulus of water glass is different.
And weighing and stirring the water glass and water for 5min, wherein the stirring speed is 200rpm, and the modulus of the water glass is 2.4 to obtain the mixed slurry.
Example 9
This embodiment is substantially the same as embodiment 1, except that: the modulus of water glass is different.
And weighing and stirring the water glass and water for 10min, wherein the stirring speed is 200rpm, and the modulus of the water glass is 2.6 to obtain the mixed slurry.
Example 10
This embodiment is substantially the same as embodiment 1, except that: the preparation method of the phospho aluminosilicate powder comprises the following steps:
s1-1, preparing aluminum sol: mixing aluminum nitrate and absolute ethyl alcohol according to a molar ratio of 1:12, vacuumizing and stirring for 8 hours to obtain aluminum sol;
s1-2, preparing silica sol: mixing tetraethoxysilane and absolute ethyl alcohol according to the molar ratio of 1:6, vacuumizing and stirring for 8 hours to obtain silica sol;
s1-3, preparation of composite sol: pouring the aluminum sol obtained in the step S1-1 and the silica sol obtained in the step S1-2 into a phosphoric acid solution, wherein the molar ratio of the aluminum sol to the silica sol to the phosphoric acid solution is 2:3:5, carrying out ultrasonic stirring for 2 hours to obtain a composite sol, wherein the ultrasonic stirring power is 40kHz, and the stirring speed is 100 rpm;
s1-4, preparing phospho aluminosilicate powder: and (4) carrying out rotary evaporation on the composite sol obtained in the step (S1-3) for 1h to obtain wet gel, putting the wet gel into a high-temperature oven, heating to 670 ℃ at a heating rate of 80 ℃/h, keeping the temperature for 3h, naturally cooling to room temperature, discharging, and grinding until the average particle size is 25 mu m.
Example 11
This embodiment is substantially the same as embodiment 1, except that: the preparation method of the phospho aluminosilicate powder comprises the following steps:
s1-1 preparation of aluminum sol: mixing aluminum nitrate and absolute ethyl alcohol according to a molar ratio of 1:12, vacuumizing and stirring for 8 hours to obtain aluminum sol;
s1-2, preparing silica sol: mixing tetraethoxysilane and absolute ethyl alcohol according to a molar ratio of 1:6, vacuumizing and stirring for 8 hours to obtain silica sol;
s1-3, preparing composite sol: pouring the aluminum sol obtained in the step S1-1 and the silica sol obtained in the step S1-2 into a phosphoric acid solution, wherein the molar ratio of the aluminum sol to the silica sol to the phosphoric acid solution is 2:3:5, carrying out ultrasonic stirring for 2 hours to obtain a composite sol, wherein the ultrasonic stirring power is 40kHz, and the stirring speed is 100 rpm;
s1-4, preparing phosphate group aluminosilicate powder: and (4) carrying out rotary evaporation on the composite sol obtained in the step (S1-3) for 1h to obtain wet gel, putting the wet gel into a high-temperature oven, heating to 650 ℃ at a heating rate of 80 ℃/h, keeping the temperature for 3h, naturally cooling to room temperature, discharging, and grinding until the average particle size is 20 microns.
Example 12
This embodiment is substantially the same as embodiment 1, except that: the preparation method of the phospho aluminosilicate powder comprises the following steps:
s1-1, preparing aluminum sol: mixing aluminum nitrate and absolute ethyl alcohol according to a molar ratio of 1:12, vacuumizing and stirring for 8 hours to obtain aluminum sol;
s1-2, preparing silica sol: mixing tetraethoxysilane and absolute ethyl alcohol according to a molar ratio of 1:6, vacuumizing and stirring for 8 hours to obtain silica sol;
s1-3, preparing composite sol: pouring the aluminum sol obtained in the step S1-1 and the silica sol obtained in the step S1-2 into a phosphoric acid solution, wherein the molar ratio of the aluminum sol to the silica sol to the phosphoric acid solution is 2:3:5, carrying out ultrasonic stirring for 2 hours to obtain a composite sol, wherein the ultrasonic stirring power is 40kHz, and the stirring speed is 100 rpm;
s1-4, preparing phospho aluminosilicate powder: and (4) performing rotary evaporation on the composite sol obtained in the step (S1-3) for 1h to obtain wet gel, putting the wet gel into a high-temperature oven, heating to 700 ℃ at a heating rate of 80 ℃/h, preserving heat for 3h, naturally cooling to room temperature, discharging, and grinding until the average particle size is 30 mu m.
Example 13
This embodiment is substantially the same as embodiment 1, except that: the specific process parameters of step S2 are different.
S2 preparation of foam: mixing and stirring the composite foaming agent and water in a high-pressure container for 15min at a mass ratio of 1:13.5, wherein the stirring speed isAt 400rpm, supercritical CO was introduced while stirring 2 Supercritical CO 2 The injection amount of the foaming agent is 0.08L/min, the temperature is kept at 42 ℃, the pressure is kept at 9MPa, and the foam is obtained, wherein the total amount of the composite foaming agent and the water is 3 parts by weight, and the composite foaming agent comprises the following components in percentage by mass: 85% of fatty alcohol-polyoxyethylene ether sodium sulfate, 2% of sodium dodecyl benzene sulfonate and the balance of silicone polyether emulsion.
Example 14
This embodiment is substantially the same as embodiment 1, except that: the specific process parameters of step S2 are different.
S2 preparation of foam: mixing and stirring the composite foaming agent and water in a high-pressure container for 20min at a mass ratio of 1:15.5, wherein the stirring speed is 400rpm, and introducing supercritical CO while stirring 2 Supercritical CO 2 The injection amount of the composite foaming agent is 0.08L/min, the temperature is kept at 46 ℃, the pressure is kept at 12MPa, and the foam is obtained, wherein the total amount of the composite foaming agent and water is 4 parts by weight, and the composite foaming agent comprises the following components in percentage by mass: 90% of fatty alcohol-polyoxyethylene ether sodium sulfate, 3% of sodium dodecyl benzene sulfonate and the balance of silicone polyether emulsion.
Example 15
This embodiment is substantially the same as embodiment 1, except that: the specific process parameters of steps S4 and S5 are different.
S4 casting molding: pouring the geopolymer foam slurry obtained in the step S3 into a mold, placing the mold under a vacuum condition, simultaneously manually vibrating for 5min, and then standing for 1h under the vacuum condition;
s5 maintenance: and (3) putting the mould into a curing room for curing treatment, adjusting the room temperature to 28 ℃, adjusting the relative humidity to 90%, covering a layer of wet cloth soaked with curing liquid above the mould for moisturizing, standing for 24 hours, demoulding to obtain a geopolymer test piece, wrapping the geopolymer test piece with a plastic film, and then placing the geopolymer test piece at 65 ℃ for continuous curing for 3 days to obtain a concrete test piece.
Example 16
This embodiment is substantially the same as embodiment 1, except that: the specific process parameters of steps S4 and S5 are different.
S4 casting molding: pouring the geopolymer foam slurry obtained in the step S3 into a mould, placing the mould under a vacuum condition, simultaneously and manually vibrating for 10min, and then standing for 1h under the vacuum condition;
s5 maintenance: and (3) putting the mould into a curing room for curing treatment, adjusting the room temperature to 22 ℃, adjusting the relative humidity to 85%, covering a layer of wet cloth soaked with curing liquid above the mould for moisturizing, standing for 24 hours, demoulding to obtain a geopolymer test piece, wrapping the geopolymer test piece with a plastic film, and then placing the geopolymer test piece at 60 ℃ for continuous curing for 3 days to obtain a concrete test piece.
Example 17
This embodiment is substantially the same as embodiment 1, except that: the components of the curing liquid are different in mass percentage.
The maintenance liquid comprises the following components in percentage by mass: 66% of paraffin emulsion, 34% of hydrogen peroxide with the mass concentration of 30%, and the paraffin emulsion comprises the following components in percentage by mass: 44% of solid paraffin, 0.5% of fatty alcohol-polyoxyethylene ether, 2% of linear polyacrylamide and the balance of deionized water.
Example 18
This embodiment is substantially the same as embodiment 1, except that: the components of the curing liquid are different in mass percentage.
The maintenance liquid comprises the following components in percentage by mass: 66% of paraffin emulsion, 34% of hydrogen peroxide with the mass concentration of 30%, and the paraffin emulsion comprises the following components in percentage by mass: 48% of solid paraffin, 2% of fatty alcohol-polyoxyethylene ether, 1% of linear polyacrylamide and the balance of deionized water.
Examples of the experiments
The geopolymer foam concrete prepared using the process and parameters of examples 1-18 was tested for performance and the results are shown in table 1:
TABLE 1 Properties of geopolymer foam concrete of examples 1-18
| Examples | Dry density Kg/m 3 | Compressive strength MPa | Water absorption Rate% |
| Example 1 | 857.3 | 19.56 | 21.87 |
| Example 2 | 813.4 | 18.95 | 19.80 |
| Example 3 | 920.1 | 20.68 | 22.94 |
| Example 4 | 932.8 | 20.77 | 21.41 |
| Example 5 | 898.5 | 20.58 | 24.15 |
| Example 6 | 881.9 | 19.87 | 21.50 |
| Example 7 | 831.6 | 19.41 | 22.03 |
| Example 8 | 932.2 | 20.87 | 20.48 |
| Example 9 | 822.4 | 19.01 | 22.41 |
| Example 10 | 950.5 | 20.90 | 19.82 |
| Example 11 | 957.4 | 20.64 | 19.58 |
| Example 12 | 952.3 | 20.62 | 19.20 |
| Example 13 | 927.7 | 20.08 | 20.06 |
| Example 14 | 925.8 | 20.00 | 20.13 |
It can be seen from this that, in examples 1 to 3, changing the mixing ratio of the components in the slurry has an influence on the performance of the geopolymer foam concrete, increasing the contents of the fine slag powder and the phosphoaluminosilicate powder increases the dry density of the geopolymer foam concrete, while increasing the water glass decreases the porosity and decreases the water absorption, and the mixing ratio of the components in example 1 is preferred to be the most reasonable.
In examples 1, 4 and 5, the water-cement ratio of water to dry material was changed to have an effect on the performance of the polymer foam concrete, and the dry density increased and the water absorption rate decreased as the water content increased, but the water content was not too high, and the water-cement ratio in example 4 was most reasonable.
In examples 1, 6 and 7, the change of the mass percentage content of each component of the slag micro powder has little influence on the performance of the geopolymer foam concrete, and the slag micro powder can be selected within the reasonable range provided by the invention.
In examples 1, 8 and 9, the change of the modulus of the water glass has an influence on the performance of the geopolymer foam concrete, the water glass is used as an alkali activator and a reactant in the reaction of the geopolymer, the reaction speed of the polymer foam concrete slurry with increased modulus is accelerated, the consistency is increased, and the water requirement is increased, so that the reasonable modulus of the water glass needs to be selected, and the modulus of the water glass in example 8 is most reasonable.
In examples 1 and 10 to 12, the phospho-aluminosilicate powders prepared by the process steps of the present invention can improve various properties of geopolymer foam concrete, and in addition, the phospho-oxytetrahedron balances the negative charge of the alundum in phospho-geopolymer, and there is no small radius ion that can move freely, so the insulation property is better.
In examples 1, 13 and 14, supercritical CO was used 2 The temperature and pressure of the reaction are controlled in a proper range, the foaming effect is good, the foam is stable and large in volume, and the bleeding amount and the subsidence amount of the foam are small. Thereby leading the performance of the geopolymer foam concrete to be better.
The freeze-thaw resistance of the geopolymer foamed concretes in examples 15-18 is shown in Table 2:
TABLE 2 Freeze and thaw resistance of geopolymer foam concrete in examples 15-18
| Examples | Freeze-thaw resistance% |
| Comparative example | 90 |
| Example 15 | 93 |
| Example 16 | 92 |
| Example 17 | 94 |
| Example 18 | 92 |
In examples 1 and 15-18, the freeze-thaw resistance of geopolymer foam concrete was improved by using the curing process and the reasonably adjusted curing solution formulation of the present invention, wherein the performance of the curing solution formulation in example 17 was the best.
Claims (9)
1. A preparation method of polymer foam concrete for filling cold-formed thin-wall section steel is characterized by comprising the following steps:
s1 preparation of slurry: weighing dry materials according to parts by weight, wherein the dry materials comprise 18-22 parts of slag micro powder, 32-36 parts of phospho aluminosilicate powder, 8-12 parts of sintered red mud, 6-9 parts of hydrated lime and 13-15 parts of water glass, the weight ratio of water to water ash of the dry materials is 0.4-0.45, weighing and stirring the slag micro powder, the phospho aluminosilicate powder, the sintered red mud and the hydrated lime according to the proportion for 5-10min, then weighing and stirring the water glass and the water for 5-10min, and mixing to obtain mixed slurry;
s2 preparation of foam: mixing and stirring the composite foaming agent and water in a high-pressure container for 15-20min according to the mass ratio of 1:13.5-15.5, and introducing supercritical CO while stirring 2 Maintaining the temperature at 42-46 ℃ and the pressure at 9-12MPa to obtain foam, wherein the total amount of the composite foaming agent and the water is 3-4 parts by weight;
s3 preparation of polymer slurry: pouring the foam obtained in the step S2 into the mixed slurry obtained in the step S1, and mixing and stirring for 20-30min to obtain geopolymer foam slurry;
s4 casting molding: pouring the geopolymer foam slurry obtained in the step S3 into a mould, placing the mould under a vacuum condition, simultaneously and manually vibrating for 5-10min, and then standing for 1h under the vacuum condition;
s5 maintenance: and (2) putting the mould into a curing room for curing treatment, adjusting the room temperature to 25 +/-3 ℃, adjusting the relative humidity to 85-90%, covering a layer of wet cloth soaked with curing liquid above the mould for moisturizing, standing for 24h, then demoulding to obtain a geopolymer test piece, wrapping the geopolymer test piece with a plastic film, and then placing the geopolymer test piece at the temperature of 60-65 ℃ for continuous curing for 3d to obtain a concrete test piece.
2. The method for preparing polymer foam concrete for filling cold-formed thin-walled steel as claimed in claim 1, wherein the slag micropowder in step S1 comprises the following components in percentage by mass: SiO 2 2 30-35％，CaO 32-34％，Al 2 O 3 17-23%, MgO 7-9%, and Fe in balance 2 O 3 The average particle size of the fine slag powder is 30 to 40 μm.
3. The method for preparing polymer foam concrete for filling cold-formed thin-walled steel as claimed in claim 1, wherein the method for preparing the phospho-aluminosilicate powder in step S1 comprises:
s1-1, preparing aluminum sol: mixing aluminum nitrate and absolute ethyl alcohol according to a molar ratio of 1:12, vacuumizing and stirring for 8 hours to obtain aluminum sol;
s1-2, preparing silica sol: mixing tetraethoxysilane and absolute ethyl alcohol according to a molar ratio of 1:6, vacuumizing and stirring for 8 hours to obtain silica sol;
s1-3, preparing composite sol: pouring the aluminum sol obtained in the step S1-1 and the silica sol obtained in the step S1-2 into a phosphoric acid solution, wherein the molar ratio of the aluminum sol to the silica sol to the phosphoric acid solution is 2:3:5, and ultrasonically stirring for 2 hours to obtain a composite sol;
s1-4, preparing phospho aluminosilicate powder: and (4) carrying out rotary evaporation on the composite sol obtained in the step S1-3 for 1h to obtain wet gel, putting the wet gel into a high-temperature oven, heating to 650-700 ℃ at a heating rate of 80 ℃/h, preserving heat for 3h, naturally cooling to room temperature, discharging, and grinding until the average particle size is 20-30 mu m.
4. The method for producing polymer foam concrete for filling cold-formed thin-walled steel according to claim 3, wherein the ultrasonic stirring power is 40kHz and the stirring speed is 100rpm in step S1-3.
5. The method for producing a polymer foam concrete for filling cold-formed thin-walled steel according to claim 1, wherein the modulus of water glass in step S1 is 2.4 to 2.6.
6. The method for preparing polymer foam concrete for filling cold-formed thin-walled steel as claimed in claim 1, wherein the foaming agent composition is compounded in step S2The components by mass percentage are as follows: 85-90% of fatty alcohol-polyoxyethylene ether sodium sulfate, 2-3% of sodium dodecyl benzene sulfonate and the balance of silicone polyether emulsion and supercritical CO 2 The injection amount of (2) was 0.08L/min.
7. The method of claim 1, wherein the stirring speed in step S1 is 200rpm, the stirring speed in step S2 is 400rpm, the stirring mode in step S3 is magnetic stirring, and the stirring speed is 300 rpm.
8. The method for preparing polymer foam concrete for filling thin-walled cold-formed steel according to claim 1, wherein the curing liquid in step S5 comprises the following components by mass percent: 66% of paraffin emulsion and 34% of hydrogen peroxide with the mass concentration of 30%.
9. The method for preparing polymer foam concrete for filling thin-walled cold-formed steel according to claim 8, wherein the paraffin emulsion comprises the following components by mass percent: 44-48% of solid paraffin, 0.5-2% of fatty alcohol-polyoxyethylene ether, 1-2% of linear polyacrylamide and the balance of deionized water.
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