CN110981338A - Early-strength graphene-polycarboxylate superplasticizer reinforced cement-based composite material and preparation method thereof - Google Patents
Early-strength graphene-polycarboxylate superplasticizer reinforced cement-based composite material and preparation method thereof Download PDFInfo
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- 239000004568 cement Substances 0.000 title claims abstract description 60
- 229920005646 polycarboxylate Polymers 0.000 title claims abstract description 36
- 239000008030 superplasticizer Substances 0.000 title claims abstract description 26
- 239000002131 composite material Substances 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 54
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 38
- 239000010881 fly ash Substances 0.000 claims abstract description 31
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 13
- 239000006004 Quartz sand Substances 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 239000003638 chemical reducing agent Substances 0.000 claims description 40
- 238000003756 stirring Methods 0.000 claims description 36
- 239000002253 acid Substances 0.000 claims description 26
- 239000000843 powder Substances 0.000 claims description 22
- 239000000243 solution Substances 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000005303 weighing Methods 0.000 claims description 7
- 239000004576 sand Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 239000011268 mixed slurry Substances 0.000 claims description 5
- 239000011259 mixed solution Substances 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 230000010355 oscillation Effects 0.000 claims description 5
- 238000009210 therapy by ultrasound Methods 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 241000446313 Lamella Species 0.000 claims description 2
- 239000011398 Portland cement Substances 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 229910052593 corundum Inorganic materials 0.000 claims description 2
- 238000011049 filling Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 2
- 229910052681 coesite Inorganic materials 0.000 claims 1
- 229910052906 cristobalite Inorganic materials 0.000 claims 1
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 229910052682 stishovite Inorganic materials 0.000 claims 1
- 229910052905 tridymite Inorganic materials 0.000 claims 1
- 230000000052 comparative effect Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000004567 concrete Substances 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 239000002135 nanosheet Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000005411 Van der Waals force Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 150000007942 carboxylates Chemical group 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004108 freeze drying Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
Abstract
The invention discloses an early strength type graphene-polycarboxylate superplasticizer reinforced cement-based composite material and a preparation method thereof, wherein the early strength type graphene-polycarboxylate superplasticizer reinforced cement-based composite material is prepared by mixing and solidifying cement, fly ash, quartz sand, water, polycarboxylate superplasticizer, graphene oxide, sodium hydroxide, defoaming agent and the like serving as raw materials according to a certain proportion.
Description
Technical Field
The invention relates to the technical field of cement additives, in particular to an early-strength graphene-polycarboxylic acid water reducing agent reinforced cement-based composite material and a preparation method thereof.
Background
The water reducing agent is the most important one in concrete admixture, and among various admixtures which are emerging at present, the market share of the polycarboxylic acid water reducing agent is continuously expanded and gradually becomes the most important water reducing agent in concrete materials. In 2018, the use proportion of the polycarboxylate superplasticizer in China accounts for more than 70% of the total use amount of the polycarboxylate superplasticizer. Therefore, the polycarboxylic acid water reducing agent plays a role in the water reducing agent.
Compared with other water reducing agents, the polycarboxylate water reducing agent has a series of advantages, and the molecular structure of the polycarboxylate water reducing agent is high in designability, so that the water reducing agent with various different properties and characteristics, such as early strength type, standard type, slow setting type, slump retaining type, high water reducing rate type and the like, can be produced by changing the types, the proportions and the reaction conditions of the polymerization monomers. The early-strength polycarboxylate superplasticizer can effectively reduce the water-cement ratio, can also reduce the difficulty of cement hydration, further effectively shortens the initial setting time and the final setting time of cement, and finally obviously improves the early strength of concrete.
The graphene oxide serving as a two-dimensional nanosheet layer material has the characteristics of overlarge specific surface area, high surface energy, high strength and the like, and has strong applicability in the process of improving the structure and performance of the material. Researches show that the oxygen-containing active groups on the surface of the graphene oxide can be used as nucleation sites of hydrated crystals to promote the nucleation and crystallization of calcium hydroxide and C-S-H gel in the early stage of cement hydration, so that the early strength of a cement matrix is improved. However, the graphene oxide is easy to agglomerate in an alkaline cement matrix and is difficult to disperse, so that the application potential of the graphene oxide is greatly reduced.
Disclosure of Invention
In order to solve the technical problems, the invention provides an early-strength graphene-polycarboxylate superplasticizer reinforced cement-based composite material and a preparation method thereof.
According to one technical scheme, the early-strength graphene-polycarboxylate superplasticizer reinforced cement-based composite material comprises the following raw materials in parts by mass: 90-100 parts of cement, 5-10 parts of fly ash ultrafine powder, 300 parts of quartz sand 270, 40-50 parts of water, 0.01-0.1% of defoaming agent by mass of the total mass of the cement and the fly ash, and 0.01-0.3% of graphene oxide-polycarboxylic acid water reducing agent by mass of the total mass of the cement and the fly ash.
Preferably, the preparation method of the graphene oxide-polycarboxylate superplasticizer comprises the following steps: adding a polycarboxylic acid water reducing agent into a container, slowly adding graphene oxide under the stirring condition, heating, after the continuous reaction is finished, adjusting the pH to 7 by using a sodium hydroxide solution, and cooling the solution to room temperature to obtain a graphene oxide-polycarboxylic acid water reducing agent solution.
Preferably, the adding mass ratio of the polycarboxylic acid water reducing agent to the graphene oxide is (40-120) to 100.
Preferably, the solid content of the polycarboxylate superplasticizer is 30-50%, the concentration of the graphene oxide solution is 7.5-7.6g/L, the thickness of the lamella is 0.9-1.2nm, and the length and the width are 500-700 nm.
Preferably, the stirring speed is 400-600r/min, the heating temperature is 40-50 ℃, and the reaction time is 6-8 h.
Preferably, the mass fraction of the sodium hydroxide solution is 20-30%.
Preferably, the cement is P.II 52.5-grade portland cement, the quartz sand is Chinese ISO standard sand, and SiO in the fly ash ultrafine powder2And Al2O3Accounting for 95-99% of the total mass, and the particle size is 250nm-2 μm.
According to the second technical scheme, the preparation method of the early-strength graphene-polycarboxylate superplasticizer reinforced cement-based composite material comprises the following steps: weighing cement and fly ash ultrafine powder according to a proportion, pouring the weighed cement and fly ash ultrafine powder into a stirring pot, and uniformly stirring for later use; weighing a graphene-polycarboxylate superplasticizer and a defoaming agent according to a proportion, and adding the graphene-polycarboxylate superplasticizer and the defoaming agent into water for ultrasonic oscillation; slowly adding the mixed solution after ultrasonic treatment into cement and fly ash ultrafine powder, mixing for 90s at a slow speed, slowly pouring quartz sand, stirring for 60s, quickly stirring for 120s, filling the mixed slurry into a mold, molding for 24 hours, demolding, and then putting into a curing box for curing.
The reason that the 90s slow stirring is that the glue sand is not added at the moment, the fluidity of the system is high, and the slow stirring can ensure that all components of the system are uniformly mixed, so the fast stirring is not suitable; the reason for the rapid stirring of 120s is that after the addition of the mortar, the fluidity of the system is sharply reduced due to the maximum relative content of the mortar, which causes difficulty in mixing, so that rapid stirring is required, and the stirring time is prolonged, thereby mixing the system more uniformly.
Preferably, the relative humidity of the curing box is more than or equal to 98 percent, and the temperature is 22.5 +/-2.5 ℃.
Preferably, the curing time is 3 to 28 days.
Compared with the prior art, the invention has the following beneficial effects:
the polymerization principle of the graphene oxide-polycarboxylate superplasticizer is as follows: the polycarboxylic acid macromolecules are grafted on the surface of the graphene oxide through covalent bonding to form a polyester structure. The carboxylate unit with anionic charge is beneficial to increasing the electrostatic repulsion force between the graphene oxide nanosheets, and the side group of the molecular chain of the polycarboxylic acid water reducing agent provides a strong steric hindrance effect, so that the van der Waals force between the graphene oxide nanosheets is weakened, and the aims of preventing the graphene oxide from agglomerating in an alkaline cement matrix and improving the dispersibility of the graphene oxide are fulfilled.
The graphene oxide-polycarboxylate superplasticizer can be liquid, can be prepared into solid powder by freeze drying and grinding, has good product performance and high water reducing rate, greatly improves the mechanical properties of cement and ultrafine fly ash mortar, can further improve the compressive and flexural strength compared with the prior art, and particularly obviously improves the early strength.
Drawings
FIG. 1 is a graph showing the influence of the early strength type graphene-polycarboxylate superplasticizer reinforced cement-based composite materials of examples 1 to 3 and comparative examples 1 to 5 on the compressive strength;
FIG. 2 is a graph showing the effect of the early strength type graphene-polycarboxylate superplasticizer reinforced cement-based composite materials of examples 1 to 3 and comparative examples 1 to 5 on the flexural strength.
Detailed description of the preferred embodiments
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in a stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference herein for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The specification and examples are exemplary only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.
The "parts" in the present invention are all parts by mass unless otherwise specified.
Example 1
(1) Adding 40 parts by mass of a polycarboxylic acid water reducing agent into a three-necked bottle, slowly adding 100 parts by mass of graphene oxide under stirring of a stirrer (500r/min), heating to 45 ℃, and continuously reacting for 8 hours; after 8h, the pH was adjusted to 7 with sodium hydroxide solution. Stopping heating, and cooling the solution to room temperature to obtain a graphene oxide-polycarboxylic acid water reducing agent solution;
(2) weighing raw materials in proportion, cement: 100 parts of fly ash ultrafine powder: 5 parts of quartz sand: 300 parts of water: 45 parts of defoaming agent accounting for 0.1% of the total mass of the cement and the fly ash, and graphene oxide-polycarboxylic acid water reducing agent: accounting for 0.1 percent of the total mass of the cement and the fly ash;
(3) pouring cement and fly ash ultrafine powder into a stirring pot, and uniformly stirring for later use; adding the graphene oxide-polycarboxylic acid water reducing agent and the defoaming agent into water, and performing ultrasonic oscillation for 20 min; slowly adding the mixed solution after ultrasonic treatment into cement and fly ash ultrafine powder, mixing and stirring at a slow speed, slowly pouring sand after 90s, stirring for 60s, and quickly stirring for 120 s; and (3) placing the mixed slurry into a mold for molding for 24 hours, then demolding, and then placing into a curing box for curing for 1 day, 3 days and 7 days respectively. The relative humidity of the curing box is 98% or more, and the temperature is 22.5 +/-2.5 ℃.
Example 2
(1) Adding 80 parts by mass of a polycarboxylic acid water reducing agent into a three-necked bottle, slowly adding 100 parts by mass of graphene oxide under stirring of a stirrer (500r/min), heating to 45 ℃, and continuously reacting for 8 hours; after 8h, the pH was adjusted to 7 with sodium hydroxide solution. Stopping heating, and cooling the solution to room temperature to obtain a graphene oxide-polycarboxylic acid water reducing agent solution;
(2) weighing raw materials in proportion, cement: 100 parts of fly ash ultrafine powder: 5 parts of quartz sand: 300 parts of water: 45 parts of defoaming agent accounting for 0.1% of the total mass of the cement and the fly ash, and graphene oxide-polycarboxylic acid water reducing agent: accounting for 0.1 percent of the total mass of the cement and the fly ash;
(3) pouring cement and fly ash ultrafine powder into a stirring pot, and uniformly stirring for later use; adding the graphene oxide-polycarboxylic acid water reducing agent and the defoaming agent into water, and performing ultrasonic oscillation for 20 min; slowly adding the mixed solution after ultrasonic treatment into cement and fly ash ultrafine powder, mixing and stirring at a slow speed, slowly pouring sand after 90s, stirring for 60s, and quickly stirring for 120 s; and (3) placing the mixed slurry into a mold for molding for 24 hours, then demolding, and then placing into a curing box for curing for 1 day, 3 days and 7 days respectively. The relative humidity of the curing box is 98% or more, and the temperature is 22.5 +/-2.5 ℃.
Example 3
(1) Adding 120 parts by mass of a polycarboxylic acid water reducing agent into a three-necked bottle, slowly adding 100 parts by mass of graphene oxide under stirring of a stirrer (500r/min), heating to 45 ℃, and continuously reacting for 8 hours; after 8h, the pH was adjusted with sodium hydroxide solution until the pH was close to 7. Stopping heating, and cooling the solution to room temperature to obtain a graphene oxide-polycarboxylic acid water reducing agent solution;
(2) weighing raw materials in proportion, cement: 100 parts of fly ash ultrafine powder: 5 parts of quartz sand: 300 parts of water: 45 parts of defoaming agent accounting for 0.1% of the total mass of the cement and the fly ash, and graphene oxide-polycarboxylic acid water reducing agent: accounting for 0.1 percent of the total mass of the cement and the fly ash;
(3) pouring cement and fly ash ultrafine powder into a stirring pot, and uniformly stirring for later use; adding the graphene oxide-polycarboxylic acid water reducing agent and the defoaming agent into water, and performing ultrasonic oscillation for 20 min; slowly adding the mixed solution after ultrasonic treatment into cement and fly ash ultrafine powder, mixing and stirring at a slow speed, slowly pouring sand after 90s, stirring for 60s, and quickly stirring for 120 s; and (3) placing the mixed slurry into a mold for molding for 24 hours, then demolding, and then placing into a curing box for curing for 1 day, 3 days and 7 days respectively. The relative humidity of the curing box is 98% or more, and the temperature is 22.5 +/-2.5 ℃.
Comparative example 1
The difference from example 3 is that the raw material is a polycarboxylic acid water reducing agent, and graphene oxide is not added.
Comparative example 2
The difference from example 3 is that the graphene oxide and the polycarboxylic acid water reducing agent are directly mixed as raw materials without the step (1) to prepare the composite material.
Performance detection
The performance of the concrete samples of examples 1-3 and comparative examples 1-2 is verified, the cement setting time is determined according to GB/T1346-. The compressive strength and the flexural strength of the cement mortar in each example were measured in accordance with GB/T176-1999 method for testing the strength of cement mortar (ISO method) for 1 day, 3 days and 7 days. Test results figures 1-2.
TABLE 1
| Solid content (%) | Water loss (%) | Initial setting time (min) | Final setting time (min) | |
| Example 1 | 20.65 | 21.14 | 170 | 202 |
| Example 2 | 28.24 | 25.52 | 178 | 214 |
| Example 3 | 36.23 | 33.79 | 193 | 224 |
| Comparative example 1 | 49.85 | 35.31 | 200 | 238 |
| Comparative example 2 | 34.82 | 28.55 | 192 | 219 |
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (10)
1. The early-strength graphene-polycarboxylate superplasticizer reinforced cement-based composite material is characterized by comprising the following raw materials in parts by mass: 90-100 parts of cement, 5-10 parts of fly ash ultrafine powder, 300 parts of quartz sand 270-containing powder, 40-50 parts of water, 0.01-0.1% of defoaming agent by mass of the total mass of the cement and the fly ash, and 0.01-0.3% of graphene oxide-polycarboxylic acid water reducing agent by mass of the total mass of the cement and the fly ash ultrafine powder.
2. The early strength type graphene-polycarboxylate water reducer reinforced cement-based composite material as claimed in claim 1, wherein the preparation method of the graphene oxide-polycarboxylate water reducer comprises the following steps: adding a polycarboxylic acid water reducing agent into a container, slowly adding graphene oxide under the stirring condition, heating, after the continuous reaction is finished, adjusting the pH to 7 by using a sodium hydroxide solution, and cooling the solution to room temperature to obtain a graphene oxide-polycarboxylic acid water reducing agent solution.
3. The early-strength graphene-polycarboxylate water reducer reinforced cement-based composite material as claimed in claim 2, wherein the polycarboxylate water reducer and the graphene oxide are added in a mass ratio of (40-120) to 100.
4. The early strength type graphene-polycarboxylate water reducer reinforced cement-based composite material as claimed in claim 2, wherein the polycarboxylate water reducer has a solid content of 30-50%, the graphene oxide solution concentration is 7.5-7.6g/L, the thickness of the lamella is 0.9-1.2nm, and the length and width are between 500 and 700 nm.
5. The early strength type graphene-polycarboxylate superplasticizer reinforced cement-based composite material as claimed in claim 2, wherein the stirring rate is 400-600r/min, the heating temperature is 40-50 ℃, and the reaction time is 6-8 h.
6. The early strength type graphene-polycarboxylate superplasticizer reinforced cement-based composite material as claimed in claim 2, wherein the mass fraction of the sodium hydroxide solution is 20-30%.
7. The early strength type graphene-polycarboxylate water reducer reinforced cement-based composite material as claimed in claim 1, wherein said cement is p.ii 52.5 grade portland cement, said quartz sand is chinese ISO standard sand, and said fly ash ultrafine powder is SiO2And Al2O3Accounting for 95-99% of the total mass, and the particle size is 250nm-2 μm.
8. The preparation method of the early strength type graphene-polycarboxylate water reducer reinforced cement-based composite material as claimed in any one of claims 1 to 7, characterized by comprising the following steps: weighing cement and fly ash ultrafine powder according to a proportion, pouring the weighed cement and fly ash ultrafine powder into a stirring pot, and uniformly stirring for later use; weighing a graphene-polycarboxylate superplasticizer and a defoaming agent according to a proportion, and adding the graphene-polycarboxylate superplasticizer and the defoaming agent into water for ultrasonic oscillation; slowly adding the mixed solution after ultrasonic treatment into cement and fly ash ultrafine powder, mixing for 90s at a slow speed, slowly pouring quartz sand, stirring for 60s, quickly stirring for 120s, filling the mixed slurry into a mold, molding for 24 hours, demolding, and then putting into a curing box for curing.
9. The preparation method of the early strength type graphene-polycarboxylate superplasticizer reinforced cement-based composite material as claimed in claim 8, wherein the relative humidity of the curing box is not less than 98%, and the temperature is 22.5 ± 2.5 ℃.
10. The preparation method of the early strength type graphene-polycarboxylate superplasticizer reinforced cement-based composite material according to claim 8, wherein the curing time is 3-28 days.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112047659A (en) * | 2020-08-25 | 2020-12-08 | 北京金隅水泥节能科技有限公司 | Water reducing agent, production process and application thereof |
| CN113149540A (en) * | 2021-01-14 | 2021-07-23 | 中国矿业大学 | Grouting material based on industrial graphene oxide and preparation method thereof |
| CN114956619A (en) * | 2022-07-01 | 2022-08-30 | 辛集市钢信新型建材有限公司 | Ecological portland cement and preparation method thereof |
| CN115108766A (en) * | 2022-07-13 | 2022-09-27 | 国发环保新材料(江门)有限公司 | Artificial stone manufactured by using construction waste and fly ash of power plant and process |
| CN117534427A (en) * | 2023-11-21 | 2024-02-09 | 美安新能源(江苏)有限公司 | Five-super inorganic cementing material and preparation method of product thereof |
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| CN112047659A (en) * | 2020-08-25 | 2020-12-08 | 北京金隅水泥节能科技有限公司 | Water reducing agent, production process and application thereof |
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| CN114956619A (en) * | 2022-07-01 | 2022-08-30 | 辛集市钢信新型建材有限公司 | Ecological portland cement and preparation method thereof |
| CN115108766A (en) * | 2022-07-13 | 2022-09-27 | 国发环保新材料(江门)有限公司 | Artificial stone manufactured by using construction waste and fly ash of power plant and process |
| CN117534427A (en) * | 2023-11-21 | 2024-02-09 | 美安新能源(江苏)有限公司 | Five-super inorganic cementing material and preparation method of product thereof |
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Application publication date: 20200410 |