CN115159883B - Concrete internal curing agent and preparation method thereof - Google Patents
Concrete internal curing agent and preparation method thereof Download PDFInfo
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- CN115159883B CN115159883B CN202210567845.3A CN202210567845A CN115159883B CN 115159883 B CN115159883 B CN 115159883B CN 202210567845 A CN202210567845 A CN 202210567845A CN 115159883 B CN115159883 B CN 115159883B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 92
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 87
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 38
- 239000002113 nanodiamond Substances 0.000 claims abstract description 37
- 239000002245 particle Substances 0.000 claims abstract description 31
- 239000006185 dispersion Substances 0.000 claims abstract description 28
- 238000001035 drying Methods 0.000 claims abstract description 19
- 238000000926 separation method Methods 0.000 claims abstract description 15
- 239000002270 dispersing agent Substances 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims abstract description 11
- 238000000227 grinding Methods 0.000 claims abstract description 8
- 238000005406 washing Methods 0.000 claims abstract description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 18
- VXAUWWUXCIMFIM-UHFFFAOYSA-M aluminum;oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Al+3] VXAUWWUXCIMFIM-UHFFFAOYSA-M 0.000 claims description 12
- 238000004062 sedimentation Methods 0.000 claims description 12
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 6
- 238000004898 kneading Methods 0.000 claims description 6
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 6
- 239000000463 material Substances 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 6
- 239000011148 porous material Substances 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 4
- 230000001502 supplementing effect Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000005345 coagulation Methods 0.000 abstract description 2
- 230000015271 coagulation Effects 0.000 abstract description 2
- 239000012467 final product Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 6
- 238000005336 cracking Methods 0.000 description 5
- 230000006872 improvement Effects 0.000 description 5
- 206010016807 Fluid retention Diseases 0.000 description 3
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002002 slurry 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
- C04B40/0042—Powdery mixtures
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
The application discloses a preparation method of a curing agent in concrete, which comprises the following steps: preparing gamma-alumina for later use; crushing and grinding gamma-alumina to obtain gamma-alumina powder with particle size; placing gamma-alumina powder into an organic dispersing agent, adding nano diamond powder at the same time to obtain a dispersion system, and then performing intensive stirring treatment on the dispersion system; separating, washing the gamma-alumina powder obtained by the separation, and drying to obtain the final product. The application adopts gamma-type alumina as an internal curing agent component, utilizes the porous property and the high-strength property of the gamma-type alumina, and ensures that the surface activity of the gamma-type alumina is obviously improved by strong stirring treatment after adding nano diamond powder, thereby being beneficial to combining with concrete materials, improving the strength of the concrete after coagulation, simultaneously ensuring that the pores of the gamma-type alumina are clearer, enlarging the pore volume and overcoming the defect of low water supplementing capacity of the gamma-type alumina.
Description
Technical Field
The application relates to the technical field of concrete additives, in particular to a concrete internal curing agent and a preparation method thereof.
Background
The internal curing agent material is a powder material, is added into the concrete in an internal mixing mode, has the advantages of reducing shrinkage, inhibiting cracking, reducing viscosity and water retention of the mixture, ensuring that the concrete still has good pouring performance and vibrating performance in a low slump state, realizing long-acting internal water retention curing, and remarkably reducing the cracking risk of the concrete.
The internal curing agent material adopts a particle size matching technology to reasonably optimize the particle sizes of different inert ultrafine powder materials so as to make up the defects of high internal porosity and poor particle grading of concrete, thereby reducing single water consumption and slurry viscosity. Meanwhile, the inert ultrafine powder material is introduced, so that the hydration temperature rise in the concrete can be effectively reduced, and the cracking sensitivity of the concrete is reduced. Moreover, the internal curing agent material has the long-term water retention and automatic water supplementing functions of the internal curing agent material so as to reduce the shrinkage cracking problem of the concrete caused by the reduction of the internal relative humidity due to cement hydration, thereby realizing the low cracking sensitivity of the concrete.
However, the existing internal curing agents mostly use porous lightweight aggregates such as kaolin, bentonite, and the like. Wide source and low cost. Researches show that the porous lightweight aggregate can reduce self-shrinkage, but the porous lightweight aggregate has larger influence on strength, and can reduce the self-shrinkage value by 50% and reduce the strength by 15% after the water-gel ratio is 0.34; when the 90% self-shrinkage value was reduced, the 28d strength was reduced by approximately 30%. Therefore, how to reduce the negative influence of the curing agent in the porous lightweight aggregate on the strength of concrete is a technical problem to be solved.
Disclosure of Invention
The application aims to provide a concrete internal curing agent and a preparation method thereof, which solve the defect that the use of the existing porous lightweight aggregate internal curing agent can obviously reduce the strength of concrete.
The application realizes the above purpose through the following technical scheme:
a preparation method of a curing agent in concrete comprises the following steps:
step one: preparing gamma-alumina for later use;
step two: crushing and grinding the gamma-alumina prepared in the step one to obtain gamma-alumina powder with the particle size of 200-300 nm;
step three: placing the gamma-alumina powder prepared in the second step into an organic dispersing agent, simultaneously adding nano-diamond powder with the particle size of 2-10nm, controlling the mass ratio of the gamma-alumina powder to the nano-diamond powder to be 2-8:1, obtaining a dispersing system, and then applying strong stirring treatment with the speed of 600-1200r/min to the dispersing system for 2-5 h;
step four: and (3) separating the dispersion system treated in the step (III), removing the nano diamond powder and the organic dispersing agent, and washing and drying the rest gamma-type alumina powder to obtain the concrete internal curing agent.
A further improvement is that in the first step, the specific operation for preparing gamma-alumina is as follows: adding an acetic acid solution which accounts for 80-150% of the weight of the pseudo-boehmite and has a mass concentration of 30-45% into the pseudo-boehmite, uniformly mixing, kneading, extruding strips, drying and roasting to obtain gamma-alumina.
A further improvement is that the roasting conditions are: roasting at 620-680 deg.c for 3.8-4.5 hr.
In the third step, the organic dispersing agent is one of ethanol, propanol, propylene glycol or isopropanol.
The further improvement is that in the third step, the using amount of the organic dispersing agent is 0.8-2 times of the total mass of the gamma-type alumina powder and the nano diamond powder.
A further improvement is that in the fourth step, the specific operation of the separation is as follows: preparing a container, arranging a filter cartridge with filter holes larger than the particle size of nano diamond powder and smaller than the particle size of gamma alumina powder in the container, pouring the dispersion system into the filter cartridge of the container for sedimentation separation, continuously applying ultrasonic vibration treatment to the dispersion system in the separation process, taking out the filter cartridge after the nano diamond powder is completely sedimentation separated, and spin-drying to obtain the rest gamma alumina powder.
The further improvement is that the frequency of the ultrasonic oscillation treatment is 30-40KHz, and the power is 400-500W.
The application also provides a concrete internal curing agent which is prepared by the preparation method.
The application has the beneficial effects that: according to the application, gamma-type alumina is adopted as an internal curing agent component, the porous property and the high-strength property of the gamma-type alumina are utilized, and the surface activity of the gamma-type alumina is obviously improved through the strong stirring treatment after adding nano diamond powder, so that the gamma-type alumina is beneficial to combining with concrete materials, the strength of the concrete after coagulation is improved, meanwhile, the pores of the gamma-type alumina are clearer, the pore volume is enlarged, and the defect of low water supplementing amount of the gamma-type alumina is overcome; in addition, the gamma-alumina and concrete particles can achieve better particle grading effect, and the shrinkage value is further reduced.
Detailed Description
The application will now be described in further detail with reference to the following examples, it being necessary to note that the following detailed description is given for the purpose of illustration only and is not to be construed as limiting the scope of the application, as numerous insubstantial modifications and adaptations of the application are possible in light of the above disclosure by those skilled in the art.
Example 1
A preparation method of a curing agent in concrete comprises the following steps:
step one: preparing gamma-alumina: adding an acetic acid solution accounting for 80% of the mass of the pseudo-boehmite and having a mass concentration of 45% into the pseudo-boehmite (purchased from new material Co., ltd., hereinafter the same) and uniformly mixing, kneading, extruding, drying and roasting at 620 ℃ for 4.5 hours to obtain gamma-alumina;
step two: crushing and grinding the gamma-alumina prepared in the step one to obtain gamma-alumina powder with the particle size of 200nm (+ -10 nm);
step three: placing the gamma-type alumina powder prepared in the second step into ethanol, simultaneously adding nano-diamond powder (purchased from Shanghai, new material technology Co., ltd., hereinafter the same) with the particle size of 2nm (+/-1 nm), controlling the mass ratio of the gamma-type alumina powder to the nano-diamond powder to be 2:1, and using the organic dispersing agent to be 0.8 times of the total mass of the gamma-type alumina powder and the nano-diamond powder to obtain a dispersion system, and then applying strong stirring treatment with the dispersion system for 2h and the speed of 1200 r/min;
step four: separating the dispersion system treated in the step three, specifically: preparing a container, arranging a filter cartridge with filter holes larger than the particle size of nano diamond powder and smaller than the particle size of gamma alumina powder in the container, pouring the dispersion system into the filter cartridge of the container for sedimentation separation, continuously applying ultrasonic vibration treatment to the dispersion system in the separation process, wherein the frequency of the ultrasonic vibration treatment is 30KHz, the power is 400W, taking out the filter cartridge after the nano diamond powder is completely sedimentation separated (no powder is settled in a period of time), spin-drying to obtain the rest gamma alumina powder, and then washing and drying the gamma alumina powder to obtain the curing agent in the concrete.
Example 2
A preparation method of a curing agent in concrete comprises the following steps:
step one: preparing gamma-alumina: adding an acetic acid solution accounting for 120 percent of the mass of the pseudo-boehmite and having a mass concentration of 38 percent into the pseudo-boehmite, kneading, extruding, drying by equipment after uniform mixing, and roasting for 4.2 hours at 650 ℃ to obtain gamma-alumina;
step two: crushing and grinding the gamma-alumina prepared in the step one to obtain gamma-alumina powder with the particle size of 250nm (+ -10 nm);
step three: placing the gamma-type alumina powder prepared in the second step into propanol, simultaneously adding nano-diamond powder with the particle size of 6nm (+ -1 nm), controlling the mass ratio of the gamma-type alumina powder to the nano-diamond powder to be 5:1, and controlling the using amount of the organic dispersing agent to be 1.2 times of the total mass of the gamma-type alumina powder and the nano-diamond powder to obtain a dispersion system, and then applying strong stirring treatment for the dispersion system for 3.5h at the speed of 900 r/min;
step four: separating the dispersion system treated in the step three, specifically: preparing a container, arranging a filter cartridge with filter holes larger than the particle size of nano diamond powder and smaller than the particle size of gamma alumina powder in the container, pouring the dispersion system into the filter cartridge of the container for sedimentation separation, continuously applying ultrasonic vibration treatment to the dispersion system in the separation process, wherein the frequency of the ultrasonic vibration treatment is 35KHz, the power is 450W, taking out the filter cartridge after the nano diamond powder is completely sedimentation separated (no powder is settled in a period of time), spin-drying to obtain the rest gamma alumina powder, and then washing and drying the gamma alumina powder to obtain the curing agent in the concrete.
Example 3
A preparation method of a curing agent in concrete comprises the following steps:
step one: preparing gamma-alumina: adding an acetic acid solution which accounts for 150% of the mass of the pseudo-boehmite and has a mass concentration of 30% into the pseudo-boehmite, kneading, extruding, drying by equipment after uniform mixing, and roasting at 680 ℃ for 3.8 hours to obtain gamma-alumina;
step two: crushing and grinding the gamma-alumina prepared in the step one to obtain gamma-alumina powder with the particle size of 300nm (+ -10 nm);
step three: placing the gamma-type alumina powder prepared in the second step into isopropanol, simultaneously adding nano-diamond powder with the particle size of 10nm (+ -1 nm), controlling the mass ratio of the gamma-type alumina powder to the nano-diamond powder to be 8:1, and controlling the using amount of the organic dispersing agent to be 2 times of the total mass of the gamma-type alumina powder and the nano-diamond powder to obtain a dispersion system, and then applying strong stirring treatment for 5 hours to the dispersion system at the speed of 600 r/min;
step four: separating the dispersion system treated in the step three, specifically: preparing a container, arranging a filter cartridge with filter holes larger than the particle size of nano diamond powder and smaller than the particle size of gamma alumina powder in the container, pouring the dispersion system into the filter cartridge of the container for sedimentation separation, continuously applying ultrasonic vibration treatment to the dispersion system in the separation process, wherein the frequency of the ultrasonic vibration treatment is 40KHz, the power is 500W, taking out the filter cartridge after the nano diamond powder is completely sedimentation separated (no powder is settled in a period of time), spin-drying to obtain the rest gamma alumina powder, and then washing and drying the gamma alumina powder to obtain the curing agent in the concrete.
Comparative example 1
A preparation method of a curing agent in concrete comprises the following steps:
step one: preparing gamma-alumina: adding an acetic acid solution which accounts for 150% of the mass of the pseudo-boehmite and has a mass concentration of 30% into the pseudo-boehmite, kneading, extruding, drying by equipment after uniform mixing, and roasting at 680 ℃ for 3.8 hours to obtain gamma-alumina;
step two: crushing and grinding the gamma-type alumina prepared in the step one to obtain gamma-type alumina powder with the particle size of 300nm (+ -10 nm), and taking the gamma-type alumina powder as the concrete internal curing agent.
Comparative example 2
A preparation method of a curing agent in concrete comprises the following steps:
step one: alpha alumina (available from atan chemical Co., ltd.) was prepared;
step two: crushing and grinding alpha-alumina to obtain alpha-alumina powder with the particle size of 300nm (+ -10 nm);
step three: placing the alpha-type alumina powder prepared in the second step into isopropanol, simultaneously adding nano-diamond powder with the particle size of 10nm (+ -1 nm), controlling the mass ratio of the alpha-type alumina powder to the nano-diamond powder to be 8:1, and controlling the using amount of the organic dispersing agent to be 2 times of the total mass of the alpha-type alumina powder and the nano-diamond powder to obtain a dispersion system, and then applying strong stirring treatment for 5 hours to the dispersion system at the speed of 600 r/min;
step four: separating the dispersion system treated in the step three, specifically: preparing a container, arranging a filter cartridge with filter holes larger than the particle size of nano diamond powder and smaller than the particle size of alpha-alumina powder in the container, pouring the dispersion system into the filter cartridge of the container for sedimentation separation, continuously applying ultrasonic vibration treatment to the dispersion system in the separation process, wherein the frequency of the ultrasonic vibration treatment is 40KHz, the power is 500W, taking out the filter cartridge after the nano diamond powder is completely sedimentation separated (no powder is settled in a period of time), spin-drying to obtain the rest alpha-alumina powder, and then washing and drying the alpha-alumina powder to obtain the curing agent in the concrete.
The concrete internal curing agents obtained in examples 1 to 3 and comparative examples 1 to 2 of the present application were applied to concrete, and concrete mixing ratios are shown in Table 1:
table 1: concrete matching table (Unit: kg)
The 7d compressive strength and the 28d compressive strength of the concrete obtained in the blank group and the experimental group (examples 1 to 3, comparative examples 1 to 2) were tested with reference to GB/T50081-2016 Standard for common concrete mechanical Property test method; meanwhile, the 28d shrinkage of the obtained concrete is tested by referring to GB/T50082-2009 Standard for test method of ordinary concrete long-term Properties and durability, and the test results are shown in Table 2:
table 2: test results
As can be seen from the results of Table 2, the internal curing agents obtained in examples 1 to 3 of the present application have a remarkable effect in reducing shrinkage of concrete, particularly example 3, which has a 28d shrinkage of only-0.0097%, and also has a high compressive strength, particularly example 2, which has a 28d compressive strength ratio of 96.79%, and does not exhibit a significant decrease in strength when shrinkage is reduced. In addition, in comparative example 1, the surface activity of gamma-type alumina is low due to no strong stirring treatment after adding nano-diamond powder, which is unfavorable for the combination with concrete material, the strength is obviously reduced compared with example 3, only 79.98%, and the shrinkage is obviously increased compared with example 3 due to small pore volume and low water supplementing amount of gamma-type alumina; comparative example 2 was a type of alpha alumina, which showed no significant difference in compressive strength from example 3, but had substantially no effect of reducing shrinkage, unlike the blank. Therefore, the gamma-alumina powder and the strong stirring treatment after adding the nano-diamond powder play a critical role in the production of the internal curing agent.
The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application.
Claims (8)
1. The preparation method of the curing agent in the concrete is characterized by comprising the following steps:
step one: preparing gamma-alumina for later use;
step two: crushing and grinding the gamma-alumina prepared in the step one to obtain gamma-alumina powder with the particle size of 200-300 nm;
step three: placing the gamma-alumina powder prepared in the second step into an organic dispersing agent, simultaneously adding nano-diamond powder with the particle size of 2-10nm, controlling the mass ratio of the gamma-alumina powder to the nano-diamond powder to be 2-8:1, obtaining a dispersing system, and then applying strong stirring treatment with the speed of 600-1200r/min to the dispersing system for 2-5 h;
step four: and (3) separating the dispersion system treated in the step (III), removing the nano diamond powder and the organic dispersing agent, and washing and drying the rest gamma-type alumina powder to obtain the concrete internal curing agent.
2. The method for preparing the curing agent in concrete according to claim 1, wherein in the first step, the specific operation for preparing gamma-alumina is as follows: adding an acetic acid solution which accounts for 80-150% of the weight of the pseudo-boehmite and has a mass concentration of 30-45% into the pseudo-boehmite, uniformly mixing, kneading, extruding strips, drying and roasting to obtain gamma-alumina.
3. The method for preparing the curing agent in concrete according to claim 2, wherein the roasting conditions are as follows: roasting at 620-680 deg.c for 3.8-4.5 hr.
4. The method for preparing an internal curing agent for concrete according to claim 1, wherein in the third step, the organic dispersant is one of ethanol, propanol, propylene glycol or isopropanol.
5. The method for preparing an internal curing agent for concrete according to claim 1, wherein in the third step, the use amount of the organic dispersing agent is 0.8-2 times of the total mass of the gamma-type alumina powder and the nano diamond powder.
6. The method for preparing a curing agent in concrete according to claim 1, wherein in the fourth step, the specific separation operation is as follows: preparing a container, arranging a filter cartridge with filter holes larger than the particle size of nano diamond powder and smaller than the particle size of gamma alumina powder in the container, pouring the dispersion system into the filter cartridge of the container for sedimentation separation, continuously applying ultrasonic vibration treatment to the dispersion system in the separation process, taking out the filter cartridge after the nano diamond powder is completely sedimentation separated, and spin-drying to obtain the rest gamma alumina powder.
7. The method for preparing a curing agent for concrete according to claim 6, wherein the frequency of the ultrasonic oscillation treatment is 30-40KHz and the power is 400-500W.
8. An internal curing agent for concrete, characterized in that it is produced by the production method according to any one of claims 1 to 7.
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| CN115159883A (en) | 2022-10-11 |
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