CN109437966B - Foam concrete based on prefabricated foam pore structure characteristics and preparation method thereof - Google Patents
Foam concrete based on prefabricated foam pore structure characteristics and preparation method thereof Download PDFInfo
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- 239000006260 foam Substances 0.000 title claims abstract description 145
- 239000011381 foam concrete Substances 0.000 title claims abstract description 110
- 239000011148 porous material Substances 0.000 title claims abstract description 55
- 238000002360 preparation method Methods 0.000 title abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000002131 composite material Substances 0.000 claims abstract description 41
- 239000010881 fly ash Substances 0.000 claims abstract description 35
- 239000002002 slurry Substances 0.000 claims abstract description 33
- 239000000843 powder Substances 0.000 claims abstract description 31
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000012190 activator Substances 0.000 claims abstract description 27
- 239000003513 alkali Substances 0.000 claims abstract description 27
- 239000003381 stabilizer Substances 0.000 claims abstract description 21
- 239000004088 foaming agent Substances 0.000 claims abstract description 20
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 19
- 239000011707 mineral Substances 0.000 claims abstract description 19
- 238000010276 construction Methods 0.000 claims abstract description 9
- 150000001875 compounds Chemical class 0.000 claims abstract description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 75
- LQZZUXJYWNFBMV-UHFFFAOYSA-N dodecan-1-ol Chemical compound CCCCCCCCCCCCO LQZZUXJYWNFBMV-UHFFFAOYSA-N 0.000 claims description 44
- 238000003756 stirring Methods 0.000 claims description 44
- 238000012360 testing method Methods 0.000 claims description 39
- 235000019353 potassium silicate Nutrition 0.000 claims description 31
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 31
- 238000005187 foaming Methods 0.000 claims description 30
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 29
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 20
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 20
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 20
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical group [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 18
- 238000005303 weighing Methods 0.000 claims description 16
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 12
- 229910052681 coesite Inorganic materials 0.000 claims description 12
- 229910052593 corundum Inorganic materials 0.000 claims description 12
- 229910052906 cristobalite Inorganic materials 0.000 claims description 12
- 239000000377 silicon dioxide Substances 0.000 claims description 12
- 229910052682 stishovite Inorganic materials 0.000 claims description 12
- 229910052905 tridymite Inorganic materials 0.000 claims description 12
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 12
- 238000010521 absorption reaction Methods 0.000 claims description 11
- 230000000740 bleeding effect Effects 0.000 claims description 8
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- 230000001276 controlling effect Effects 0.000 abstract description 4
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- 239000000126 substance Substances 0.000 description 13
- 239000002893 slag Substances 0.000 description 10
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- 239000004567 concrete Substances 0.000 description 9
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- 235000019333 sodium laurylsulphate Nutrition 0.000 description 9
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- 239000008399 tap water Substances 0.000 description 3
- 235000020679 tap water Nutrition 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
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- RCEAADKTGXTDOA-UHFFFAOYSA-N OS(O)(=O)=O.CCCCCCCCCCCC[Na] Chemical compound OS(O)(=O)=O.CCCCCCCCCCCC[Na] RCEAADKTGXTDOA-UHFFFAOYSA-N 0.000 description 1
- 244000137852 Petrea volubilis Species 0.000 description 1
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B38/106—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam by adding preformed foams
-
- 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
- C04B30/00—Compositions for artificial stone, not containing binders
-
- 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
Abstract
The invention relates to foam concrete based on a prefabricated foam pore structure and a preparation method thereof. The foam concrete is prepared from slurry and prefabricated foam, wherein the slurry comprises the following components in percentage by mass: 25.0-30.0% of mineral powder, 38.0-45.0% of fly ash, 23.0-30.0% of compound alkali activator and 5.0-13.0% of water; the components and the dosage (the mass added in each 1000ml of water) of the prefabricated foam are as follows: 2.0-5.0g of foaming agent, 0.5-2.5g of composite foam stabilizer and 2.5-7.5g of absolute ethyl alcohol. According to the invention, various physical and mechanical performance indexes of the foam concrete are regulated and controlled by controlling the relevant pore structure parameters of the foam concrete, so that different requirements are met to adapt to the field situation in actual construction.
Description
Technical Field
The invention belongs to the technical field of inorganic composite materials, and particularly relates to foam concrete based on prefabricated foam pore structure characteristics and a preparation method thereof.
Background
The foam concrete is a concrete product which is formed by introducing gas into concrete slurry in a chemical or physical mode and reasonably curing and forming, contains a large number of fine closed air holes and has considerable strength.
As a novel energy-saving environment-friendly building material, the foam concrete has the advantages of small density, light weight, heat preservation, sound insulation, shock resistance and the like, but also has the defects of low strength, difficult control of field density, incapability of controlling pore structure parameters of the foam concrete and further regulation and control of various physical and mechanical properties of the foam concrete and the like.
Disclosure of Invention
In view of the above, the invention provides a method for preparing foam concrete based on a prefabricated foam pore structure, which comprises the steps of adopting prefabricated foam, and driving foams prepared according to different mixing ratios into net slurry in different volumes according to different purposes or special requirements of building concrete so as to prepare the foam concrete with different pore structure characteristics; various physical and mechanical performance indexes of the foam concrete are regulated and controlled by controlling relevant pore structure parameters of the foam concrete, and different requirements are met so as to adapt to the field situation in actual construction.
The invention provides a preparation method of foam concrete based on a prefabricated foam pore structure, which comprises the following steps:
s1, preparing prefabricated foam: mixing a foaming agent, a composite foam stabilizer, absolute ethyl alcohol and water, pouring the mixture into a foaming device, and foaming by using a compressed air method to prepare prefabricated foam;
s2, preparing a composite alkali activator: weighing a certain amount of analytically pure sodium hydroxide and water glass, pouring the analytically pure sodium hydroxide into the water glass, fully stirring, covering a preservative film, standing and replenishing water;
s3, preparing slurry: weighing a certain amount of fly ash and mineral powder, uniformly mixing, adding the fly ash and the mineral powder into a stirring pot together with the composite alkali activator prepared in the step S2 and water, and uniformly stirring to prepare slurry;
s4, preparing foam concrete: and (5) adding the prefabricated foam prepared in the step (S1) into the slurry prepared in the step (S3), stirring until the prefabricated foam and the slurry are uniformly mixed, pouring into a mold, and curing after the mold is removed to obtain the foam concrete.
Further, the step S1 is specifically:
s1.1, weighing a certain amount of foaming agent, composite foam stabilizer, absolute ethyl alcohol and water, placing the foaming agent and the foam stabilizer in the absolute ethyl alcohol, stirring for 4 minutes to accelerate dissolution, then adding water, and stirring for 4 minutes to obtain a mixed solution;
s1.2, placing the mixed solution in the step S1.1 into a foaming device, wherein the foaming device is connected with an air compressor through a hose; and foaming by using an air compressor to obtain the prefabricated foam.
Further, the method also comprises the step of testing the pore structure of the prefabricated foam, and the testing method comprises the following steps:
s1.3, taking a small amount of the prefabricated foam prepared in the step S1.2 by using a glass slide, slowly layering by using a knife, and observing and collecting images under an optical microscope;
and S1.4, importing the Image acquired in the step S1.3 into Image analysis software such as Imagepro Plus, Image J and the like, firstly carrying out gray level and binarization processing, setting a scale, and then measuring parameters such as roundness, Feret diameter, aperture distribution and the like of the Image.
The invention also provides foam concrete based on the prefabricated foam pore structure, which is prepared by the method and is prepared from slurry and prefabricated foam; the slurry comprises the following components in percentage by mass: 25.0-30.0% of mineral powder, 38.0-45.0% of fly ash, 23.0-30.0% of compound alkali activator and 5.0-13.0% of water; the prefabricated foam comprises the following components in percentage by mass (per 1000ml of water): 2.0-5.0g of foaming agent, 0.5-2.5g of composite foam stabilizer and 2.5-7.5g of absolute ethyl alcohol.
Further, the foaming agent is sodium dodecyl sulfate, and the purity of the foaming agent is not lower than 90%; the composite foam stabilizer comprises the following components of sodium carboxymethyl cellulose and dodecanol, wherein the purity of the sodium carboxymethyl cellulose is not lower than 90%, the purity of the dodecanol is not lower than 92%, and the ratio (mass percentage) of the sodium carboxymethyl cellulose to the dodecanol in the composite foam stabilizer is as follows: 30.0-50.0% of sodium carboxymethylcellulose and 50.0-70.0% of dodecanol; the purity of the absolute ethyl alcohol is not lower than 95 percent, the mass of the absolute ethyl alcohol is the sum of the mass of lauryl sodium sulfate, sodium carboxymethyl cellulose and lauryl alcohol, the composite alkali activator is prepared by compounding analytically pure sodium hydroxide and water glass for construction, and the proportioning and dosage is as follows (mass percent): 12 to 20 percent of analytically pure sodium hydroxide and 80 to 88 percent of architectural water glass, wherein the analytically pure sodium hydroxide has the purity of over 96 percent, the modulus of the architectural water glass is 1.0 to 3.8, and the baume degree is 34.0 to 42.0.
Furthermore, the compound alkali activator is compounded by analytically pure sodium hydroxide and water glass for construction.
Further, the roundness of the pore structure of the prefabricated foam is 1.3000-2.3000, and the average Feret diameter is 0.1500-0.5500 mm; wherein the average Feret diameter is between 0.1500-0.5000mm and the total number of pores is about 75%, and the average Feret diameter is between 0.5000-0.5500mm and the total number of pores is about 25%.
Further, the density of the prefabricated foam is 0.0100-0.0400g/ml, the foaming times are 40.00-85.00, the settling distance of 1h is 10-40mm, and the bleeding rate of 1h is 30-65%.
Furthermore, the grade of the ore powder is not lower than the grade of S95, and the specific surface area of the ore powder is 400-2/kg, its main component is Al2O3、SiO2And CaO; the fly ash meets the requirements that the screen residue of the fly ash after passing through a 45-micron square-hole sieve is not more than 12 percent, the ignition loss of the fly ash is less than 5 percent, and the main component of the fly ash is Al2O3And SiO2。
Furthermore, the specific surface area of the ore powder is 410-460m2Between/kg.
Furthermore, the dry density of the foam concrete is 1580kg/m3The fluidity is 155-210mm, the 7d compressive strength is 1.0-60.0MPa, the thermal conductivity is 0.040-0.085W/(m.k), the capillary water absorption is 2.20-20.00%, the porosity is 1.0-80.0%, the roundness is 1.0000-2.0500, and the average Feret diameter is 0.4500-0.9000 mm.
The technical scheme of the invention has the following beneficial effects:
(1) the foam concrete raw material is environment-friendly, has low cost and has important significance for the building productivity and the environmental protection in China;
(2) the foam concrete has wide application, and establishes quantitative relation between the performance of the prefabricated foam, particularly between the pore structure parameters and the relevant mechanical properties of the foam concrete;
(3) the foam concrete has excellent dry density and can bear higher pressure, and a series of related indexes such as thermal conductivity, fluidity, capillary water absorption and the like of the foam concrete meet the requirements of first-class products in foam concrete (JG/T266-; during specific construction, the pore structure parameters of the foam can be adjusted by adjusting the mixing proportion of the prefabricated foam or the mixing amount of the foam according to different requirements, and then various indexes of the foam concrete are adjusted, so that different construction and application conditions are met.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention.
FIG. 1 is a flow chart of the preparation of foam concrete based on the structural characteristics of the prefabricated foam cells in an example of the present invention;
FIG. 2 is a flow chart of the preparation of a prefoamed foam in the example of the present invention;
FIG. 3 is a schematic diagram showing the cell structure of the physical prefoamed foam of example 1;
FIG. 4 is a schematic view of the cross-sectional hole structure of foam concrete based on the prefabricated foam hole structure characteristics in example 5 of the present invention;
FIG. 5 is a schematic view of the microscopic features of the cellular structure of the foam concrete under a scanning electron microscope in example 5 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
The fluidity test method is carried out according to the thirteenth item of the homogeneity test method of the concrete admixture (GB/T8077-2012), the compression strength test method is carried out according to the cement mortar strength test method (GB/T17671-1999), and the dry density test method is carried out according to the test method of the inorganic hard heat-insulating product (GB/T5486-2008).
The invention provides a preparation method of foam concrete based on a prefabricated foam pore structure, which comprises the following steps as shown in figure 1:
s1, preparing prefabricated foam: mixing a foaming agent, a composite foam stabilizer and water, pouring the mixture into a foaming device, and foaming by using a compressed air method to prepare prefabricated foam;
as shown in fig. 2, step S1 includes:
s1.1, weighing a certain amount of foaming agent, composite foam stabilizer, absolute ethyl alcohol and water, placing the foaming agent and the foam stabilizer in the absolute ethyl alcohol, stirring for 4 minutes to accelerate dissolution, then adding 1000ml of water, and stirring for 4 minutes to obtain a mixed solution;
s1.2, placing the mixed solution in the step S1.1 into a foaming device, wherein the foaming device is connected with an air compressor through a hose; and foaming by using an air compressor to obtain the prefabricated foam.
Illustratively, the foaming agent is sodium lauryl sulfate, a white powdery substance having a purity of not less than 90%, preferably a purity of more than 97%; the composite foam stabilizer comprises the components of sodium carboxymethyl cellulose and dodecanol, wherein the sodium carboxymethyl cellulose is a yellowish fibrous substance with the purity of not less than 90%, preferably the purity is higher than 96%, and the dodecanol is a yellow oily substance with the purity of not less than 92%, preferably the purity is higher than 96%.
Illustratively, the ratio (mass percentage) of the sodium carboxymethyl cellulose to the dodecanol in the composite foam stabilizer is as follows: 30.0 to 50.0 percent of sodium carboxymethyl cellulose and 50.0 to 70.0 percent of dodecanol.
Illustratively, the absolute ethanol in the prefoamed foam is used for accelerating solute dissolution, and is colorless transparent liquid with purity of not less than 95%, preferably purity of more than 98%, and the mass of the absolute ethanol is the sum of the mass of sodium dodecyl sulfate, sodium carboxymethyl cellulose and lauryl alcohol.
It should be noted that, the prepared prefabricated foam is subjected to a pore structure analysis test, and the specific steps are as follows:
s1.3, taking a small amount of the prefabricated foam prepared in the step S1.2 by using a glass slide, slowly layering by using a knife, and observing and collecting images under an optical microscope;
and S1.4, importing the Image acquired in the step S1.3 into Image analysis software such as Imagepro Plus, Image J and the like, firstly carrying out gray level and binarization processing, setting a scale, and then measuring parameters such as roundness, Feret diameter, aperture distribution and the like of the Image.
The specific pore structure parameters of the precast foam are as follows: the roundness of the pore structure is 1.3000-2.3000, and the average Feret diameter is 0.1500-0.5500 mm; wherein the average Feret diameter is between 0.1500-0.5000mm and the total number of pores is about 75%, and the average Feret diameter is between 0.5000-0.5500mm and the total number of pores is about 25%.
In addition, the density of the prefabricated foam is 0.0100-0.0400g/ml, the foaming multiple is 40.00-85.00, the settling distance of 1h is 10-40mm, and the bleeding rate of 1h is 30-65%; at the same time, the specification in 'foaming agent for foam concrete' (JC/T2199-2013) in China is as follows: the foaming times of the foam liquid are at least more than 15 times, the 1h settlement distance of first-class foam is not more than 50mm, the 1h bleeding rate is not more than 70%, the 1h settlement distance of qualified foam is not more than 70mm, and the 1h bleeding rate is not more than 80%; in contrast to this specification, the preformed foam produced by the present invention is of top-quality.
S2, preparing a composite alkali activator: weighing a certain amount of analytically pure NaOH and water glass, pouring the analytically pure NaOH into the water glass, fully stirring, covering a preservative film, placing at normal temperature for one day, and supplementing water;
illustratively, the composite alkali activator is compounded by analytically pure NaOH and water glass for construction; the purity of the analytically pure sodium hydroxide is preferably over 96 percent, the sodium hydroxide is water glass for buildings, and the water glass is colorless and transparent, the modulus is 2.6-3.8, the baume degree is 34.0-42.0, the preferred modulus is 2.8-3.5, and the baume degree is 36.0-40.0.
S3, preparing slurry: weighing a certain amount of fly ash and mineral powder, uniformly mixing, adding the fly ash and the mineral powder into a stirring pot together with the composite alkali activator prepared in the step S2 and water, and uniformly stirring to prepare slurry;
preferably, theThe grade of the ore powder is not lower than the grade of S95, and the specific surface area of the ore powder is 400-2More preferably, the specific surface area of the ore powder is 410-460m2Per kg; the main component of the mineral powder is Al2O3、SiO2And CaO; the fly ash meets the requirements that the screen residue of the fly ash after passing through a 45-micron square-hole sieve is not more than 12 percent, the ignition loss of the fly ash is less than 5 percent, and the main component is Al2O3And SiO2. The aggregate used by the foam concrete prepared by the invention is mining waste residue, which is beneficial to environmental protection and saves cost.
S4, preparing foam concrete: adding the prefabricated foam prepared in the step S1 into the slurry prepared in the step S3, slowly stirring for 4min until the prefabricated foam and the slurry are uniformly mixed, and pouring into a mold of 40mm multiplied by 40 mm; and removing the mold after 24 hours, and curing for 7 days at the temperature of 25 ℃ and the humidity of 95 percent to obtain the foam concrete.
The foam concrete based on the prefabricated foam pore structure prepared by the method is prepared from slurry and prefabricated foam; the slurry comprises the following components in percentage by mass: 25.0-30.0% of mineral powder, 38.0-45.0% of fly ash, 23.0-30.0% of compound alkali activator and 5.0-13.0% of water; the prefabricated foam comprises the following components in percentage by mass (per 1000ml of water): 2.0-5.0g of foaming agent, 0.5-2.5g of composite foam stabilizer and 2.5-7.5g of absolute ethyl alcohol. The dry density of the foam concrete is 1580kg/m3The fluidity is 155-210mm, the 7d compressive strength is 1.0-60.0MPa, the thermal conductivity is 0.040-0.085W/(m.k), the capillary water absorption is 2.20-20.00%, the porosity is 1.0-80.0%, the roundness is 1.0000-2.0500, and the average Feret diameter is 0.4500-0.9000 mm.
The foam concrete prepared according to the method and the raw material proportion and based on the characteristics of the prefabricated foam pore structure is tested for the pore structure, and the specific process is as follows:
(1) obtaining a foam concrete section picture: the prepared foam concrete is filled into a 200ml plastic cup, and after the foam concrete is coagulated and hardened, a foam concrete sample maintained for 3d is cut off from the middle along the vertical direction of gas generation by a hard alloy saw blade; selecting a circular section with the diameter of 60mm, grinding the circular section with 400-mesh sand paper, polishing the circular section, and removing powder on the surface of the section of the hole with a brush to flatten the section of the sample; and simultaneously coating the section with ink, naturally drying, coating the section with CaO powder, and leveling to finally make the pore diameter boundary clearly visible, and taking a section photo by using an optical microscope.
(2) Testing the pore structure parameters of the foam concrete: and (3) introducing the acquired section picture into Image analysis software such as Imagepro Plus, Image J and the like, carrying out Image binarization processing, and testing pore structure parameters such as porosity, average Feret diameter, roundness, pore size distribution and the like after setting a scale.
In addition, for the prepared foam concrete based on the prefabricated foam pore structure characteristics, the macroscopic performance index test method comprises the following steps:
(1) compressive strength: curing a cubic foam concrete test piece of 40mm multiplied by 40mm for 7 days at 25 ℃ and 95% humidity, and then testing the compressive strength under a standard compressive testing machine;
(2) dry density: curing a cubic foam concrete test piece of 40mm multiplied by 40mm for 7 days at 25 ℃ and 95% humidity, placing the test piece in a standard oven, drying the test piece to constant weight at 50 ℃ to 70 ℃, and immediately weighing the mass M of the test piece0Dividing the volume of the test piece by the volume of the test piece to obtain the dry density of the test piece;
(3) fluidity: when the foam concrete is just stirred, immediately injecting the foam concrete into a hollowed circular table with the upper top surface diameter of 36mm, the lower bottom surface diameter of 60mm and the height of 60mm, slowly lifting the circular table until the foam concrete stops flowing after being compacted, wherein the average diameter of the spread foam concrete is the fluidity;
(4) coefficient of thermal conductivity: maintaining a cubic foam concrete test piece of 40mm multiplied by 40mm for 7 days at 25 ℃ under the condition of 95% humidity, placing the test piece under a heat conductivity coefficient tester, and reading the heat conductivity coefficient value;
(5) softening coefficient: maintaining a cubic foam concrete test piece of 40mm multiplied by 40mm in the same proportion for 7 days at 25 ℃ and 95% humidity, putting the test piece No. 1 in water, taking out the test piece after absorbing water to constant weight, and immediately measuring the compressive strength of the test piece, which is marked as P1; placing the No. 2 test block in a standard oven, drying at 50-70 ℃ until the weight is constant, taking out, immediately measuring the compressive strength, and marking the compressive strength as P2, wherein the softening coefficient of the test block is K = P1/P2;
(6) capillary water absorption: maintaining a cubic foam concrete test piece of 100mm multiplied by 100mm for 7d at 25 ℃, 95% humidity, then placing the test piece in a standard oven, drying the test piece at 50-70 ℃ until the weight is constant, taking out the test piece, placing the test piece in a water tank, and placing two iron rods with the diameter of 5mm at the bottom of the test piece to prevent the bottom of the test piece from contacting with the water tank; after soaking, the test piece mass is measured every 10min in the first 30min, the test piece mass is measured every 30min after 30min, and the experiment is finished after soaking for 7 h. Capillary water absorption is according to the formula
Calculation, where i is the cumulative water absorption per unit cross-sectional area (mm)3/mm2) S is capillary water absorption, t is water absorption time(s), and b is i-axis intercept.
After the prepared foam concrete is tested according to the method, the relationship between the physical and mechanical properties of the foam concrete doped with different prefabricated foams is summarized, and the method specifically comprises the following steps:
(1) the average Feret diameter of the prefabricated foam is 0.1500-0.5500mm, the roundness is 1.3000-2.3000, the dry density of the foam concrete is 1580kg/m3；
(2) When the average Feret diameter of the prefabricated foam is 0.1500-0.5500mm and the roundness is 1.3000-2.3000, the compressive strength of the foam concrete under 7d curing is 1.0-60.0 MPa;
(3) the average Feret diameter of the prefabricated foam is 0.1500-0.5500mm, and when the roundness is 1.3000-2.3000, the thermal conductivity of the foam concrete is 0.040-0.085W/(m.k);
(4) the average Feret diameter of the prefabricated foam is 0.1500-0.5500mm, and the fluidity of the foam concrete is 155-210mm when the roundness is 1.3000-2.3000;
(5) the average Feret diameter of the prefabricated foam is 0.1500-0.5500mm, and when the roundness is 1.3000-2.3000, the capillary water absorption of the foam concrete is 2.20% -20.00%;
(6) the average Feret diameter of the prefabricated foam is 0.1500-0.5500mm, and when the roundness is 1.3000-2.3000, the porosity of the foam concrete is 1.0% -80.0%;
(7) the average Feret diameter of the prefabricated foam is 0.1500-0.5500mm, and the roundness of the foam concrete is 1.0000-2.0500 when the roundness is 1.3000-2.3000;
(8) the average Feret diameter of the prefabricated foam is 0.1500-0.5500mm, and when the roundness is 1.3000-2.3000, the average Feret diameter of the foam concrete is 0.4500-0.9000 mm.
The present invention will be described in further detail with reference to specific examples.
Example 1
Example 1 provides a foam concrete based on a prefabricated foam cell structure feature, specifically prepared as follows:
the dosage and preparation method of each component of the prefabricated foam are as follows:
mixing 3g of Sodium Dodecyl Sulfate (SDS), 0.48g of dodecanol and 0.72g of sodium carboxymethylcellulose (CMC), adding 4.2g of absolute ethyl alcohol to accelerate dissolution of solute, stirring for 4min, adding 1000ml of water, stirring for 4min, pouring the obtained solution into a foaming device, connecting the foaming device with an air compressor through a hose, starting the air compressor, and carrying out foaming treatment to obtain the prefabricated foam.
The Sodium Dodecyl Sulfate (SDS) is a white powdery substance with the purity higher than 99.6 percent, the sodium carboxymethyl cellulose (CMC) is a light yellow fibrous substance with the purity higher than 97 percent, and the dodecanol is a yellow oily substance with the purity of 97.85 percent; the absolute ethyl alcohol is colorless transparent liquid with the purity higher than 99.7 percent, and the mass of the absolute ethyl alcohol is the sum of the mass of SDS, CMC and dodecanol.
FIG. 3 is a schematic diagram showing the cell structure of the preformed foam prepared by the above formulation, and the prepared preformed foam has the following properties: the foam density is 0.0146g/ml, the foaming times is 69 times, the 1h settlement distance is 14.20mm, the 1h bleeding rate is 45.03%, the roundness of foam air holes is 1.9225, and the average Feret diameter is 0.2904 mm.
A preparation method of foam concrete based on prefabricated foam pore structure characteristics comprises the following steps:
(1) firstly, dissolving 101.5g of NaOH in 500g of water glass, fully stirring, covering a bottle mouth with a layer of preservative film, placing the bottle mouth under the condition of normal temperature for one day, and supplementing water to prepare a composite alkali activator;
(2) weighing 180.6g of fly ash, 120.4g of mineral powder and 33.1g of water, mixing with 113.9g of the prepared composite alkali activator, and stirring; after stirring for 4min, adding 900ml of the prefabricated foam of the embodiment into the slurry, slowly stirring for 4min until the prefabricated foam and the slurry are uniformly mixed, pouring into a mold, removing the mold after 24h, and putting the test piece into a standard curing box (25 ℃, 95% humidity) for curing for 7 d; thus obtaining the foam concrete based on the prefabricated foam pore structure characteristics.
The mineral powder is S95 grade and has a specific surface area of 424m2The/kg meets the requirement of granulating blast furnace slag in granulated blast furnace slag powder for cement, mortar and concrete (GB/T18046-2017), and the main component of the granulated blast furnace slag is Al2O3、SiO2And CaO; the fly ash meets the requirements that after passing through a square-hole sieve with the fineness of 45 mu m, the screen residue is not more than 12 percent, the ignition loss of the fly ash is less than 5 percent, and the main component of the fly ash is Al2O3And SiO2. The sodium hydroxide is analytically pure, the purity is higher than 96%, the water glass is water glass for buildings, the water glass is colorless and transparent, the modulus is 3.24, the baume degree is 39.50, and the water is tap water.
The physical and mechanical parameters of the finally obtained foam concrete in example 1 are shown in table 1:
TABLE 1 foam concrete physical and mechanical parameters
Example 2
Example 2 provides a foam concrete based on the cellular structure characteristics of the precast foam, the amounts of the components of the precast foam and the preparation method are the same as in example 1.
A preparation method of foam concrete based on prefabricated foam pore structure characteristics comprises the following steps:
(1) firstly, 101.5g of NaOH is dissolved in 500g of water glass, a layer of preservative film is covered on a bottle mouth after the mixture is fully stirred, and the mixture is placed under the condition of normal temperature for one day and then is supplemented with water, so as to prepare the composite alkali activator.
(2) Weighing 180.6g of fly ash, 120.4g of mineral powder and 33.1g of water, mixing with 113.9g of the prepared composite alkali activator, and stirring; and (3) adding 1100ml of prefabricated foam prepared in the embodiment into the slurry after stirring for 4min, slowly stirring for 4min until the prefabricated foam and the slurry are uniformly mixed, pouring into a mold, removing the mold after 24h, and putting the test piece into a standard curing box (25 ℃, 95% humidity) for curing for 7d to obtain the foam concrete based on the prefabricated foam pore structure characteristics.
The purity of each of the above-mentioned raw materials in example 2 was the same as in example 1.
The physical and mechanical parameters of the finally obtained foam concrete in example 2 are shown in Table 2:
TABLE 2 foam concrete physical and mechanical parameters
Example 3
Example 3 provides a foam concrete based on a prefabricated foam cell structure feature, specifically prepared as follows:
the dosage and the preparation method of each component of the prefabricated foam are as follows:
mixing 3g of Sodium Dodecyl Sulfate (SDS), 0.56g of dodecanol and 0.84g of sodium carboxymethylcellulose (CMC), adding 4.4g of absolute ethyl alcohol to accelerate dissolution of solute, stirring for 4min, adding 1000ml of water, stirring for 4min, pouring the obtained solution into a foaming device, connecting the foaming device with an air compressor through a hose, starting the air compressor, and carrying out foaming treatment to obtain the prefabricated foam.
The Sodium Dodecyl Sulfate (SDS) is a white powdery substance with the purity higher than 99.6 percent, the sodium carboxymethyl cellulose (CMC) is a light yellow fibrous substance with the purity higher than 97 percent, and the dodecanol is a yellow oily substance with the purity of 97.85 percent; the absolute ethyl alcohol is colorless transparent liquid with the purity higher than 99.7 percent, and the mass of the absolute ethyl alcohol is the sum of the mass of SDS, CMC and dodecanol.
The prefabricated foam prepared by the proportion has the following properties: the foam density is 0.0140g/ml, the foaming times are 71 times, the 1h settlement distance is 14.82mm, the 1h bleeding rate is 41.46%, the roundness of foam air holes is 1.8456, and the average Feret diameter is 0.2380 mm.
A preparation method of foam concrete based on prefabricated foam pore structure characteristics comprises the following steps:
(1) firstly, dissolving 101.5g of NaOH in 500g of water glass, fully stirring, covering a bottle mouth with a layer of preservative film, placing the bottle mouth under the condition of normal temperature for one day, and supplementing water to prepare a composite alkali activator;
(2) weighing 180.6g of fly ash, 120.4g of mineral powder and 33.1g of water, mixing with 113.9g of the prepared composite alkali activator, and stirring; and after stirring for 4min, adding 900ml of the prefabricated foam prepared in the embodiment into the slurry, slowly stirring for 4min until the prefabricated foam and the slurry are uniformly mixed, pouring into a mold, removing the mold after 24h, and curing the test piece in a standard curing box (25 ℃, 95% humidity) for 7d to obtain the foam concrete based on the prefabricated foam pore structure characteristics.
The mineral powder is S95 grade and has a specific surface area of 424m2/kg, meets the requirement of the specification of granulating blast furnace slag in granulated blast furnace slag powder for cement, mortar and concrete (GB/T18046-2017), and the main component of the granulated blast furnace slag is Al2O3、SiO2And CaO. The fly ash meets the requirements that after passing through a square-hole sieve with the fineness of 45 mu m, the screen residue is not more than 12 percent, the ignition loss of the fly ash is less than 5 percent, and the main component of the fly ash is Al2O3And SiO2. The sodium hydroxide is analytically pure, the purity is higher than 96%, the water glass is water glass for buildings, the water glass is colorless and transparent, the modulus is 3.24, the baume degree is 39.50, and the used water is tap water.
The physical and mechanical parameters of the finally obtained foam concrete in example 3 are shown in Table 3:
TABLE 3 foam concrete physical and mechanical parameters
Example 4
Example 4 provides a foam concrete based on the cellular structure characteristics of the precast foam, the amounts of the components of the precast foam and the preparation method are the same as in example 1.
A preparation method of foam concrete based on prefabricated foam pore structure characteristics comprises the following steps:
(1) firstly, 101.5g of NaOH is dissolved in 500g of water glass, a layer of preservative film is covered on a bottle mouth after the mixture is fully stirred, and the mixture is placed under the condition of normal temperature for one day and then is supplemented with water, so as to prepare the composite alkali activator.
(2) Weighing 180.6g of fly ash, 120.4g of mineral powder and 33.1g of water, mixing with 113.9g of the prepared composite alkali activator, and stirring; and (3) adding 1100ml of prefabricated foam prepared in the embodiment into the slurry after stirring for 4min, slowly stirring for 4min until the prefabricated foam and the slurry are uniformly mixed, pouring into a mold, removing the mold after 24h, and putting the test piece into a standard curing box (25 ℃, 95% humidity) for curing for 7d to obtain the foam concrete based on the prefabricated foam pore structure characteristics.
The purity of each of the above-mentioned raw materials in example 4 was the same as in example 1.
The physical and mechanical parameters of the finally obtained foam concrete in example 4 are shown in Table 4:
TABLE 4 foam concrete physical and mechanical parameters
Example 5
Example 5 provides a foam concrete based on the pore structure characteristics of the precast foam, the amounts of the components of the precast foam and the preparation method being as follows:
mixing 3g of Sodium Dodecyl Sulfate (SDS), 0.64g of dodecanol and 0.96g of sodium carboxymethylcellulose (CMC), adding 4.6g of absolute ethyl alcohol to accelerate dissolution of solute, stirring for 4min, adding 1000ml of water, stirring for 4min, pouring the obtained solution into a foaming device, connecting the foaming device with an air compressor through a hose, starting the air compressor, and carrying out foaming treatment to obtain the prefabricated foam.
The Sodium Dodecyl Sulfate (SDS) is a white powdery substance with the purity higher than 99.6 percent, the sodium carboxymethyl cellulose (CMC) is a light yellow fibrous substance with the purity higher than 97 percent, and the dodecanol is a yellow oily substance with the purity of 97.85 percent; the absolute ethyl alcohol is colorless transparent liquid with the purity higher than 99.7 percent, and the mass of the absolute ethyl alcohol is the sum of the mass of SDS, CMC and dodecanol.
The prefabricated foam prepared by the proportion has the following properties: the foam density is 0.0162g/ml, the foaming times are 62 times, the settling distance is 15.15mm in 1h, the bleeding rate in 1h is 48.84%, the roundness of foam air holes is 1.7411, and the average Feret diameter is 0.2099 mm.
A preparation method of foam concrete based on prefabricated foam pore structure characteristics comprises the following steps:
(1) firstly, dissolving 101.5g of NaOH in 500g of water glass, fully stirring, covering a bottle mouth with a layer of preservative film, placing the bottle mouth under the condition of normal temperature for one day, and supplementing water to prepare a composite alkali activator;
(2) weighing 180.6g of fly ash, 120.4g of mineral powder and 33.1g of water, mixing with 113.9g of the prepared composite alkali activator, and stirring; and after stirring for 4min, adding 900ml of the prefabricated foam prepared in the embodiment into the slurry, slowly stirring for 4min until the prefabricated foam and the slurry are uniformly mixed, pouring into a mold, removing the mold after 24h, and curing the test piece in a standard curing box (25 ℃, 95% humidity) for 7d to obtain the foam concrete based on the prefabricated foam pore structure characteristics.
FIG. 4 is a schematic view showing the structural characteristics of a cross-sectional hole of a foam concrete in example 5; FIG. 5 is a schematic representation of the microscopic features of the cellular structure of the foam concrete under the scanning electron microscope in example 5.
The mineral powder is S95 grade and has a specific surface area of 424m2/kg, meets the requirement of the specification of granulating blast furnace slag in granulated blast furnace slag powder for cement, mortar and concrete (GB/T18046-2017), and the main component of the granulated blast furnace slag is Al2O3、SiO2And CaO. The fly ash can pass through a square hole sieve with the fineness of 45 mu mThe sieve residue is not more than 12%, the ignition loss of the fly ash is less than 5%, and the main component of the fly ash is Al2O3And SiO2. The sodium hydroxide is analytically pure, the purity is higher than 96%, the water glass is water glass for buildings, the water glass is colorless and transparent, the modulus is 3.24, the baume degree is 39.50, and the water is tap water.
The physical and mechanical parameters of the finally obtained foam concrete in example 5 are shown in Table 5:
TABLE 5 foam concrete physical and mechanical parameters
Example 6
Example 6 provides a foam concrete based on the cellular structure characteristics of the prefoamed foam, the amounts of the components of the prefoamed foam and the preparation method are the same as in example 5.
A preparation method of foam concrete based on prefabricated foam pore structure characteristics comprises the following steps:
(1) firstly, 101.5g of NaOH is dissolved in 500g of water glass, a layer of preservative film is covered on a bottle mouth after the mixture is fully stirred, and the mixture is placed under the condition of normal temperature for one day and then is supplemented with water, so as to prepare the composite alkali activator.
(2) Weighing 180.6g of fly ash, 120.4g of mineral powder and 33.1g of water, mixing with 113.9g of the prepared composite alkali activator, and stirring; and (3) adding 1100ml of prefabricated foam prepared in the embodiment into the slurry after stirring for 4min, slowly stirring for 4min until the prefabricated foam and the slurry are uniformly mixed, pouring into a mold, removing the mold after 24h, and putting the test piece into a standard curing box (25 ℃, 95% humidity) for curing for 7d to obtain the foam concrete based on the prefabricated foam pore structure characteristics.
The purity of each of the above-mentioned raw materials in example 6 was the same as that in example 5.
The physical and mechanical parameters of the finally obtained foam concrete in example 6 are shown in Table 6:
TABLE 6 foam concrete physical and mechanical parameters
The invention provides a foam concrete preparation method based on a prefabricated foam pore structure, which comprises the steps of adopting prefabricated foam, and driving foams prepared according to different mixing ratios into neat paste according to different volume mixing amounts according to different purposes or special requirements of building concrete so as to prepare foam concrete with different pore structure characteristics; various physical and mechanical performance indexes of the foam concrete are regulated and controlled by controlling relevant pore structure parameters of the foam concrete, and different requirements are met so as to adapt to the field situation in actual construction.
The foam concrete prepared by the invention has the advantages of environment-friendly raw materials and lower cost, and has important significance for the building productivity and even environmental protection in China; the prepared foam concrete has excellent dry density and can bear higher pressure, and a series of related indexes such as thermal conductivity, fluidity, capillary water absorption and the like all meet the requirements of qualified products and even first-class products of granulated blast furnace slag powder (GB/T18046-2017) used in cement, mortar and concrete.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A method of producing foam concrete based on the structural characteristics of a prefabricated foam cell, comprising the steps of:
s1, preparing prefabricated foam: mixing a foaming agent, a composite foam stabilizer, absolute ethyl alcohol and water, and foaming to obtain prefabricated foam; wherein the prefabricated foam comprises the following components in percentage by weight: 2.0-5.0g of foaming agent, 0.5-2.5g of composite foam stabilizer and 2.5-7.5g of absolute ethyl alcohol are added into each 1000ml of water; the roundness of the pore structure of the prefabricated foam is 1.3000-2.3000, and the average Feret diameter is 0.1500-0.5500 mm; wherein 75% of the total number of pores with an average Feret diameter of between 0.1500 and 0.5000mm and 25% of the total number of pores with an average Feret diameter of between 0.5000 and 0.5500 mm;
s2, preparing a composite alkali activator: weighing a certain amount of sodium hydroxide and water glass, pouring the sodium hydroxide into the water glass, fully stirring, sealing, standing and replenishing water to obtain a composite alkali activator;
s3, preparing slurry: weighing a certain amount of fly ash and mineral powder, uniformly mixing, and uniformly stirring with the composite alkali activator prepared in the step S2 and water to prepare slurry; the slurry comprises the following components in percentage by weight: 25.0-30.0% of mineral powder, 38.0-45.0% of fly ash, 23.0-30.0% of compound alkali activator and 5.0-13.0% of water in percentage by mass;
s4, preparing foam concrete: and (5) adding the prefabricated foam prepared in the step (S1) into the slurry prepared in the step (S3), stirring until the prefabricated foam and the slurry are uniformly mixed, pouring into a mold, and curing after the mold is removed to obtain the foam concrete.
2. The method for preparing the foam concrete based on the prefabricated foam pore structure characteristics according to the claim 1, wherein the step S1 is specifically as follows:
s1.1, weighing a certain amount of foaming agent, composite foam stabilizer, absolute ethyl alcohol and water, placing the foaming agent and the composite foam stabilizer in the absolute ethyl alcohol, stirring to accelerate the dissolution of the foaming agent and the composite foam stabilizer, and then adding the water and stirring to obtain a mixed solution;
s1.2, placing the mixed solution in the step S1.1 into a foaming device, wherein the foaming device is connected with an air compressor through a hose; and foaming by using an air compressor to obtain the prefabricated foam.
3. The method of claim 2, further comprising testing the cell structure of the precast foam by the steps of:
s1.3, taking a small amount of prefabricated foam prepared in the step S1.2 by using a glass slide, slowly layering the prefabricated foam, and observing and collecting images under an optical microscope;
and S1.4, carrying out gray scale and binarization processing on the image acquired in the step S1.3, and measuring the hole structure parameters of the image after setting a scale.
4. The method for preparing the foam concrete based on the prefabricated foam pore structure characteristics according to the claim 1, characterized in that the foaming agent is sodium dodecyl sulfate, the purity of which is not less than 90%; the composite foam stabilizer comprises the following components of sodium carboxymethyl cellulose and dodecanol, wherein the purity of the sodium carboxymethyl cellulose is not lower than 90%, the purity of the dodecanol is not lower than 92%, and the ratio of the sodium carboxymethyl cellulose to the dodecanol in the composite foam stabilizer is as follows: 30.0-50.0 percent of sodium carboxymethyl cellulose and 50.0-70.0 percent of dodecanol; the purity of the absolute ethyl alcohol is not lower than 95%; the composite alkali activator is prepared by compounding analytically pure sodium hydroxide and water glass for construction, and the proportioning and dosage are as follows: 12-20% of analytically pure sodium hydroxide and 80-88% of water glass for buildings, wherein the purity of the analytically pure sodium hydroxide is more than 96%, the modulus of the water glass for buildings is 1.0-3.8, and the baume degree is 34.0-42.0.
5. The method for preparing the foam concrete based on the prefabricated foam pore structure characteristics, according to the claim 1, is characterized in that the mass of the absolute ethyl alcohol is the sum of the mass of the foaming agent and the mass of the composite foam stabilizer.
6. The method for preparing the foam concrete based on the prefabricated foam pore structure characteristics as claimed in claim 1, wherein the prefabricated foam has a density of 0.0100-0.0400g/ml, a foaming multiple of 40.00-85.00, a 1h settlement distance of 10-40mm, and a 1h bleeding rate of 30-65%.
7. The method as claimed in claim 1, wherein the fine ore grade is not lower than S95 grade, and the specific surface area of the fine ore is 400-480m2/kg, its main component is Al2O3、SiO2And CaO; the fly ash meets the requirements that the screen residue of the fly ash after passing through a 45-micron square-hole sieve is not more than 12 percent, the ignition loss of the fly ash is less than 5 percent, and the main component of the fly ash is Al2O3And SiO2。
8. The method for preparing foam concrete based on prefabricated foam pore structure characteristics as claimed in claim 1, wherein the dry density of the foam concrete is 1580kg/m and 320-3The fluidity is 155-210mm, the 7d compressive strength is 1.0-60.0MPa, the thermal conductivity is 0.040-0.085W/(m.K), the capillary water absorption is 2.20-20.00%, the porosity is 1.0-80.0%, the roundness is 1.0000-2.0500, and the average Feret diameter is 0.4500-0.9000 mm.
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Application publication date: 20190308 Assignee: Anhui BRC new environmental protection building materials Co.,Ltd. Assignor: CHINA University OF GEOSCIENCES (WUHAN CITY) Contract record no.: X2024980001703 Denomination of invention: A foam concrete based on the structural characteristics of prefabricated foam holes and its preparation method Granted publication date: 20201208 License type: Common License Record date: 20240131 |
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