CN113511873A - Preparation method of high-strength foam lightweight concrete - Google Patents
Preparation method of high-strength foam lightweight concrete Download PDFInfo
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- CN113511873A CN113511873A CN202110491725.5A CN202110491725A CN113511873A CN 113511873 A CN113511873 A CN 113511873A CN 202110491725 A CN202110491725 A CN 202110491725A CN 113511873 A CN113511873 A CN 113511873A
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- 239000004567 concrete Substances 0.000 title claims abstract description 43
- 239000006260 foam Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 35
- 239000010440 gypsum Substances 0.000 claims abstract description 35
- 239000010936 titanium Substances 0.000 claims abstract description 35
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 35
- 239000002893 slag Substances 0.000 claims abstract description 30
- 239000011398 Portland cement Substances 0.000 claims abstract description 28
- 239000004568 cement Substances 0.000 claims abstract description 27
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 20
- 239000004088 foaming agent Substances 0.000 claims abstract description 19
- 239000003381 stabilizer Substances 0.000 claims abstract description 17
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 15
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 13
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims description 27
- 239000002002 slurry Substances 0.000 claims description 20
- 238000005187 foaming Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- DJHGAFSJWGLOIV-UHFFFAOYSA-N Arsenic acid Chemical group O[As](O)(O)=O DJHGAFSJWGLOIV-UHFFFAOYSA-N 0.000 claims description 2
- 108010064851 Plant Proteins Proteins 0.000 claims description 2
- 235000021120 animal protein Nutrition 0.000 claims description 2
- 229940000488 arsenic acid Drugs 0.000 claims description 2
- GCPXMJHSNVMWNM-UHFFFAOYSA-N arsenous acid Chemical compound O[As](O)O GCPXMJHSNVMWNM-UHFFFAOYSA-N 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims description 2
- 235000021118 plant-derived protein Nutrition 0.000 claims description 2
- 235000018102 proteins Nutrition 0.000 claims description 2
- 108090000623 proteins and genes Proteins 0.000 claims description 2
- 102000004169 proteins and genes Human genes 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims 2
- 239000004566 building material Substances 0.000 abstract description 3
- 239000011381 foam concrete Substances 0.000 description 24
- 238000012360 testing method Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 4
- 238000004321 preservation Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- 229910052925 anhydrite Inorganic materials 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920005646 polycarboxylate Polymers 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000003469 silicate cement Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
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
- 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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00008—Obtaining or using nanotechnology related materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention belongs to the technical field of building materials, and particularly relates to a preparation method of high-strength foam lightweight concrete, which comprises the following components in parts by weight: 50-55 parts of titanium gypsum powder, 18-22 parts of slag powder, 20-25 parts of portland cement, 1-1.5 parts of a foam stabilizer, 1-1.5 parts of a cement foaming agent, 0.5-0.8 part of a water reducing agent, 0.8-1.2 parts of nitrogen-doped silicon dioxide and 0.5-0.8 part of nano zinc oxide powder.
Description
Technical Field
The invention belongs to the technical field of building materials, relates to concrete, and particularly relates to a preparation method of high-strength foam lightweight concrete.
Background
The foamed concrete is a novel light heat-insulating material containing a large number of closed air holes, which is formed by fully foaming a foaming agent in a mechanical mode through a foaming system of a foaming machine, uniformly mixing the foam with cement slurry, then carrying out cast-in-place construction or mould forming through a pumping system of the foaming machine and carrying out natural curing; the foaming concrete is a double-sleeve polymer with a continuous structure and containing uniform air holes, wherein the foaming agent, cement, fly ash, stone powder and the like are stirred into an organic cementing material; the foamed concrete is used for roof heat preservation slope finding, ground heat preservation cushion layer, upturned beam foundation pit filling, wall body pouring and other energy-saving materials.
As a novel energy-saving environment-friendly building material, the material has the advantages that: has the advantages of low density, light weight, heat preservation, sound insulation, shock resistance and the like. However, the open porosity of the foam concrete is high, so that the compressive strength of the foam concrete is seriously low, and the application range of the foam concrete is greatly limited, and meanwhile, Na, K and the like exist in the foam concrete and have destructive effects on bubbles, so that most of the pores are open, namely the pores inside the concrete are communicated, so that the impermeability of the foam cement is poor, and when the surface of the foam concrete is cracked or damaged, the foam concrete is very easy to absorb external moisture, and the service life of the foam concrete is seriously shortened.
In view of the above-mentioned defects existing in the existing foam concrete, the inventor of the present invention has made active research and innovation based on the practical experience and professional knowledge that are abundant for many years in the design and manufacture of such products, and by using the theory, in order to create a preparation method of high-strength foam lightweight concrete, and the addition amount of water and titanium gypsum powder, slag powder and portland cement is accurately controlled through a calculation formula, so that the wet volume weight of slurry is accurately controlled, the open porosity in the foam concrete is greatly reduced, and the strength and impermeability of the foam concrete are improved. After continuous research and design and repeated trial production and improvement, the invention with practical value is finally created.
Disclosure of Invention
The first object of the present invention is to provide a method for preparing high strength foamed lightweight concrete, which can precisely control the wet volume weight of slurry, greatly reduce the open porosity in the foamed concrete, improve the strength and impermeability of the foamed concrete, and have industrial value.
The technical purpose of the invention is realized by the following technical scheme:
the invention provides a preparation method of high-strength foam lightweight concrete, which comprises the following components in parts by weight: 50-55 parts of titanium gypsum powder, 18-22 parts of slag powder, 20-25 parts of portland cement, 1-1.5 parts of a foam stabilizer, 1-1.5 parts of a cement foaming agent, 0.5-0.8 part of a water reducing agent, 0.8-1.2 parts of nitrogen-doped silicon dioxide and 0.5-0.8 part of nano zinc oxide powder, and the preparation method comprises the following steps:
s1, uniformly mixing the titanium gypsum powder, the slag powder and the portland cement in a dry mode, adding water according to the water-cement ratio of 0.4-0.5, adding the foam stabilizer, and uniformly stirring;
s2, adding a proper amount of water reducing agent, cement foaming agent, nitrogen-doped silicon dioxide and nano zinc oxide powder into the stirred slurry, and controlling the stirring speed and time to control the wet volume weight of the obtained foam to be 1.05-1.45 g/cm3；
And S3, injecting the foaming body into a mold for molding, demolding, placing in a closed kettle, introducing steam into the kettle, converting for 7-8 hours under the pressure of 1.15-1.20 MPa, and finally drying to constant weight under natural conditions to obtain the high-strength foamed lightweight concrete.
In the present invention, titanium gypsum is half as much as the raw material, and in order to obtain a high-strength foamed concrete with such a high titanium gypsum content, the strength of the foamed concrete has been conventionally secured by adding thereto an aggregate having high strength or a hydraulic binder and adding thereto various additives. Secondly, the invention adopts a means completely different from the prior art, specifically, the invention firstly strictly controls the wet volume weight of the slurry and the dosage and the stirring time of the water reducing agent in the foaming process, further controls the wet volume weight of the foaming body, and then utilizes the high-pressure steam to lead part of CaSO in the titanium gypsum to be separated4The calcium sulfate and hydration products of the cement are chemically reacted under the conditions of high temperature and high pressure to generate ettringite providing mechanical strength, and part of CaSO4And Fe2O3Fully converted into sulfur-containing CaFe by reaction2O4Iso-reticular minerals, part of CaSO4And TiO2The perovskite is generated by reaction, so that the bonding strength between the components of the titanium gypsum and between the titanium gypsum and other components is improved, and the integral compressive strength of the dried foam concrete product is ensured. And Fe2O3Can be used together with nano zinc oxide and nitrogen-doped titanium dioxide to reduce toxic and harmful organic matters in the foam concrete under the irradiation of visible lightThe decomposition improves the self-cleaning capability of the foamed concrete on one hand, and avoids the corrosion of organic matters to the foamed concrete and prolongs the service life of the foamed concrete by degrading the organic matters on the other hand.
Further, the cement foaming agent is a plant protein and animal protein composite foaming agent.
Further, the water reducing agent is an arsenic acid modified polycarboxylate water reducing agent or an arsenous acid polycarboxylate water reducing agent.
Furthermore, the specific surface area of the slag powder is more than or equal to 450m2/kg。
Further, the portland cement is 42.5# cement.
Further, in step S1, the adding amount of the titanium gypsum powder, the slag powder, the portland cement and the water is controlled, so that the wet volume weight of the slurry obtained after uniform stirring is 2.1-2.3 g/cm3。
Further, the calculation formula of step S1 for controlling the addition amounts of titanium gypsum powder, slag powder, portland cement, and water is as follows:
wherein M is the addition of water in parts, M is the total addition of titanium gypsum powder, slag powder and portland cement in parts, and rho1Is the minimum value of the wet volume weight of the slurry and has the unit of g/cm3，ρ2Is the minimum value of the wet volume weight of the foam and has the unit of g/cm3And P is a regression parameter.
With the increase of the content of the titanium gypsum, the water consumption of the concrete reaching the same slump is obviously increased, particularly for low-water-cement-ratio high-strength concrete, the cylinder pouring time is obviously increased, namely the viscosity of the mixture is increased, so that the water demand of the system can be increased by adding excessive titanium gypsum, and the performance of the concrete mixture is reduced.
Further, the foam stabilizer is a protein foam stabilizer.
Further, in step S2, the mixture is rapidly stirred for 30-40S at a stirring speed of 100rmp/min and then at a medium speed of 50rpm/min for 20-30S. By the preparation method of rapid stirring and slow stirring, the concrete with large aperture and the concrete with small aperture have the characteristic of gradient in density and stress change, and the strength and the impermeability of the foam concrete are further improved.
In conclusion, the invention has the following beneficial effects:
according to the invention, the adding amount of water, titanium gypsum powder, slag powder and portland cement is accurately controlled through a calculation formula, so that the wet volume weight of the slurry is accurately controlled, the open porosity in the foamed concrete is greatly reduced, and the strength and the impermeability of the foamed concrete are improved.
Detailed Description
To further illustrate the technical means and effects adopted by the present invention to achieve the predetermined objects, the detailed description of the embodiments, features and effects of the high strength foamed lightweight concrete according to the present invention is provided below.
Example 1
A preparation method of high-strength foam lightweight concrete comprises the following components: 50 parts of titanium gypsum powder, 18 parts of slag powder, 20 parts of Portland cement, 1 part of a foam stabilizer, 1 part of a cement foaming agent, 0.5 part of a water reducing agent, 0.8 part of nitrogen-doped silicon dioxide and 0.5 part of nano zinc oxide powder, wherein the preparation method comprises the following steps:
s1, uniformly mixing the titanium gypsum powder, the slag powder and the portland cement in a dry mode, adding water according to the water-cement ratio of 0.4-0.5, adding the foam stabilizer, and uniformly stirring;
s2, adding a proper amount of water reducing agent, cement foaming agent, nitrogen-doped silicon dioxide and nano zinc oxide powder into the stirred slurry, and controlling the stirring speed and time to control the wet volume weight of the obtained foam to be 1.05-1.45 g/cm3；
And S3, injecting the foaming body into a mold for molding, demolding, placing in a closed kettle, introducing steam into the kettle, converting for 7-8 hours under the pressure of 1.15-1.20 MPa, and finally drying to constant weight under natural conditions to obtain the high-strength foamed lightweight concrete.
Example 2
A preparation method of high-strength foam lightweight concrete comprises the following components: 55 parts of titanium gypsum powder, 22 parts of slag powder, 25 parts of portland cement, 1.5 parts of a foam stabilizer, 1.5 parts of a cement foaming agent, 0.8 part of a water reducing agent, 1.2 parts of nitrogen-doped silicon dioxide and 0.8 part of nano zinc oxide powder, wherein the preparation method comprises the following steps:
s1, uniformly mixing the titanium gypsum powder, the slag powder and the portland cement in a dry mode, adding water according to the water-cement ratio of 0.4-0.5, adding the foam stabilizer, uniformly stirring, and controlling the adding amount of the titanium gypsum powder, the slag powder, the portland cement and the water, so that the wet volume weight of the obtained slurry after uniform stirring is 2.1-2.3 g/cm3；
S2, adding a proper amount of water reducing agent, cement foaming agent, nitrogen-doped silicon dioxide and nano zinc oxide powder into the stirred slurry, and controlling the stirring speed and time to control the wet volume weight of the obtained foam to be 1.05-1.45 g/cm3；
And S3, injecting the foaming body into a mold for molding, demolding, placing in a closed kettle, introducing steam into the kettle, converting for 7-8 hours under the pressure of 1.15-1.20 MPa, and finally drying to constant weight under natural conditions to obtain the high-strength foamed lightweight concrete.
Example 3
A preparation method of high-strength foam lightweight concrete comprises the following components: 55 parts of titanium gypsum powder, 22 parts of slag powder, 25 parts of portland cement, 1.5 parts of a foam stabilizer, 1.5 parts of a cement foaming agent, 0.8 part of a water reducing agent, 1.2 parts of nitrogen-doped silicon dioxide and 0.8 part of nano zinc oxide powder, wherein the preparation method comprises the following steps:
s1, uniformly mixing the titanium gypsum powder, the slag powder and the portland cement in a dry mode, adding water according to the water-cement ratio of 0.4-0.5, adding the foam stabilizer, uniformly stirring, and controlling the adding amount of the titanium gypsum powder, the slag powder, the portland cement and the water, so that the wet volume weight of the obtained slurry after uniform stirring is 2.1～2.3g/cm3；
S2, adding a proper amount of water reducing agent, cement foaming agent, nitrogen-doped silicon dioxide and nano zinc oxide powder into the stirred slurry, and controlling the stirring speed and time to control the wet volume weight of the obtained foam to be 1.05-1.45 g/cm3；
And S3, injecting the foaming body into a mold for molding, demolding, placing in a closed kettle, introducing steam into the kettle, converting for 7-8 hours under the pressure of 1.15-1.20 MPa, and finally drying to constant weight under natural conditions to obtain the high-strength foamed lightweight concrete.
Wherein, the calculation formula of the addition of the titanium gypsum powder, the slag powder, the portland cement and the water is as follows:
m is the adding amount of water in parts, M is the total adding amount of titanium gypsum powder, slag powder and silicate cement in parts, and rho1Is the minimum value of the wet volume weight of the slurry and has the unit of g/cm3，ρ2Is the minimum value of the wet volume weight of the foam and has the unit of g/cm3And P is a regression parameter.
Example 4
A preparation method of high-strength foam lightweight concrete comprises the following components: 55 parts of titanium gypsum powder, 22 parts of slag powder, 25 parts of portland cement, 1.5 parts of a foam stabilizer, 1.5 parts of a cement foaming agent, 0.8 part of a water reducing agent, 1.2 parts of nitrogen-doped silicon dioxide and 0.8 part of nano zinc oxide powder, wherein the preparation method comprises the following steps:
s1, uniformly mixing the titanium gypsum powder, the slag powder and the portland cement in a dry mode, adding water according to the water-cement ratio of 0.4-0.5, adding the foam stabilizer, uniformly stirring, and controlling the adding amount of the titanium gypsum powder, the slag powder, the portland cement and the water, so that the wet volume weight of the obtained slurry after uniform stirring is 2.1-2.3 g/cm3；
S2, adding a proper amount of water reducing agent, cement foaming agent, nitrogen-doped silicon dioxide and nano zinc oxide powder into the stirred slurry, andcontrolling the stirring speed and time to control the wet volume weight of the obtained foam to be 1.05-1.45 g/cm3Firstly, quickly stirring for 30-40 s at a stirring speed of 100rmp/min, and then stirring for 20-30 s at a medium speed of 50 rpm/min;
and S3, injecting the foaming body into a mold for molding, demolding, placing in a closed kettle, introducing steam into the kettle, converting for 7-8 hours under the pressure of 1.15-1.20 MPa, and finally drying to constant weight under natural conditions to obtain the high-strength foamed lightweight concrete.
Wherein, the calculation formula of the addition of the titanium gypsum powder, the slag powder, the portland cement and the water is as follows:
m is the adding amount of water in parts, M is the total adding amount of titanium gypsum powder, slag powder and silicate cement in parts, and rho1Is the minimum value of the wet volume weight of the slurry and has the unit of g/cm3，ρ2Is the minimum value of the wet volume weight of the foam and has the unit of g/cm3And P is a regression parameter.
Examples 1 to 4 were tested, the specific test procedure was as follows:
(1) slump test
Test subjects: examples 1 to 4, the concrete products were prepared by mixing the above materials in the respective proportions. The test method comprises the following steps: wetting the slump bucket and the slump expansion testing flat plate by water, carving a circle with the diameter of 500mm on the plate, and filling the slump bucket with a test object without vibrating; scraping off the redundant concrete at the barrel opening, then clearing the residual concrete around, vertically lifting the slump cone within 30 seconds, and simultaneously timing by using a stopwatch until the concrete flows to a circle of 500mm, wherein the timing is T500; and after the concrete is static, measuring the maximum diameter and the height of the concrete in the vertical direction.
TABLE 1 slump test results
| T500 | Diameter of | Height | |
| Example 1 | 4.8 | 673 | 61 |
| Example 2 | 4.4 | 670 | 60 |
| Example 3 | 4.4 | 689 | 52 |
| Example 4 | 4.2 | 689 | 50 |
(2) Determination of compressive Strength
Test subjects: in the embodiments 1 to 4, the concrete is prepared into finished concrete according to the respective proportions by stirring, and then the cube standard test block with the size of 100mm multiplied by 100mm is prepared.
The test method comprises the following steps: the test was carried out according to Standard test methods for mechanical Properties of ordinary concrete (GB50081-2002), and the compressive strengths at 7d and 28d were measured.
TABLE 2 compressive Strength test results
| 7d | 28d | |
| Example 1 | 16 | 18.2 |
| Example 2 | 17 | 19.1 |
| Example 3 | 17 | 19.3 |
| Example 4 | 19 | 20.1 |
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The preparation method of the high-strength foam lightweight concrete is characterized by comprising the following components in parts by weight: 50-55 parts of titanium gypsum powder, 18-22 parts of slag powder, 20-25 parts of portland cement, 1-1.5 parts of a foam stabilizer, 1-1.5 parts of a cement foaming agent, 0.5-0.8 part of a water reducing agent, 0.8-1.2 parts of nitrogen-doped silicon dioxide and 0.5-0.8 part of nano zinc oxide powder, and the preparation method comprises the following steps:
s1, uniformly mixing the titanium gypsum powder, the slag powder and the portland cement in a dry mode, adding water according to the water-cement ratio of 0.4-0.5, adding the foam stabilizer, and uniformly stirring;
s2, adding a proper amount of water reducing agent, cement foaming agent, nitrogen-doped silicon dioxide and nano zinc oxide powder into the stirred slurry, and controlling the stirring speed and time to control the wet volume weight of the obtained foam to be 1.05-1.45 g/cm3；
And S3, injecting the foaming body into a mold for molding, demolding, placing in a closed kettle, introducing steam into the kettle, converting for 7-8 hours under the pressure of 1.15-1.20 MPa, and finally drying to constant weight under natural conditions to obtain the high-strength foamed lightweight concrete.
2. The method for preparing high-strength foamed lightweight concrete according to claim 1, wherein the cement foaming agent is a plant protein and animal protein composite foaming agent.
3. The method for preparing high-strength foamed lightweight concrete according to claim 1 or 2, wherein the water reducing agent is an arsenic acid modified polycarboxylic acid water reducing agent or an arsenous acid polycarboxylic acid water reducing agent.
4. The method for preparing high strength foamed lightweight concrete according to claim 1,the specific surface area of the slag powder is more than or equal to 450m2/kg。
5. The method for preparing high-strength foamed lightweight concrete according to claim 1, wherein the portland cement is 42.5# cement.
6. The method for preparing high-strength foamed lightweight concrete according to claim 5, wherein in step S1, the addition amounts of titanium gypsum powder, slag powder, portland cement and water are controlled so that the wet volume weight of the slurry obtained after uniform stirring is 2.1-2.3 g/cm3。
7. The method for preparing high-strength foamed lightweight concrete according to claim 6, wherein the calculation formula for controlling the addition amount of titanium gypsum powder, slag powder, portland cement and water in step 1 is as follows:
wherein M is the addition of water in parts, M is the total addition of titanium gypsum powder, slag powder and portland cement in parts, and rho1Is the minimum value of the wet volume weight of the slurry and has the unit of g/cm3，ρ2Is the minimum value of the wet volume weight of the foam and has the unit of g/cm3And P is a regression parameter.
8. The method for preparing high-strength foamed lightweight concrete according to claim 1, wherein the foam stabilizer is a protein foam stabilizer.
9. The method for preparing high-strength foamed lightweight concrete according to any one of claims 1 to 8, wherein in step S2, the mixture is rapidly stirred for 30 to 40 seconds at a stirring speed of 100rmp/min, and then is stirred at a medium speed of 20 to 30 seconds at a stirring speed of 50 rpm/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110491725.5A CN113511873A (en) | 2021-05-06 | 2021-05-06 | Preparation method of high-strength foam lightweight concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110491725.5A CN113511873A (en) | 2021-05-06 | 2021-05-06 | Preparation method of high-strength foam lightweight concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114701068A (en) * | 2022-05-06 | 2022-07-05 | 北京欣东岩建材科技有限公司 | System and method for preparing foamed concrete |
| CN115340350A (en) * | 2022-10-18 | 2022-11-15 | 山东交通学院 | Cement composite undisturbed titanium gypsum-based foam concrete and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114701068A (en) * | 2022-05-06 | 2022-07-05 | 北京欣东岩建材科技有限公司 | System and method for preparing foamed concrete |
| CN114701068B (en) * | 2022-05-06 | 2023-11-28 | 北京欣东岩建材科技有限公司 | System and method for preparing foaming concrete |
| CN115340350A (en) * | 2022-10-18 | 2022-11-15 | 山东交通学院 | Cement composite undisturbed titanium gypsum-based foam concrete and preparation method thereof |
| CN115340350B (en) * | 2022-10-18 | 2022-12-20 | 山东交通学院 | Cement composite undisturbed titanium gypsum-based foam concrete and preparation method thereof |
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