CN111116082A - MXene modified concrete early strength agent and preparation method thereof - Google Patents
MXene modified concrete early strength agent and preparation method thereof Download PDFInfo
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- CN111116082A CN111116082A CN202010122359.1A CN202010122359A CN111116082A CN 111116082 A CN111116082 A CN 111116082A CN 202010122359 A CN202010122359 A CN 202010122359A CN 111116082 A CN111116082 A CN 111116082A
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- early strength
- bromide
- strength agent
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- mxene
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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
- 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
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/10—Accelerators; Activators
Abstract
The invention discloses an MXene modified concrete early strength agent, which comprises the following components: 20-50 parts of MXene; 5-35 parts of acetate; 15-35 parts of bromide; 10-20 parts of calcium fluoride; and 2-10 parts of triethanolamine. The preparation method of the early strength agent comprises the following steps: mixing MXene, acetate, calcium fluoride and bromide in a mixer in proportion, adding triethanolamine and grinding. The MXene modified concrete early strength agent and the preparation method thereof provided by the invention have the characteristics of greatly improving the early strength of concrete, continuously increasing the later strength and improving the durability of concrete; meanwhile, the preparation method is simple in process, convenient to implement and free from interference of the field environment.
Description
Technical Field
The invention relates to an MXene modified concrete early strength agent and a preparation method thereof, belonging to the technical field of concrete admixtures.
Background
The concrete early strength agent is an additive capable of improving the early strength of concrete, and the main action mechanism of the concrete early strength agent is to accelerate the hydration rate of cement and promote the development of the early strength of concrete. The early strength agent is mainly used for concrete products, steam-cured concrete and concrete engineering with early strength requirement, which is constructed in the environment of normal temperature, low temperature and lowest temperature not lower than-5 ℃.
The early strength agent is mixed in winter construction or concrete engineering with early strength requirement to achieve critical strength as soon as possible, and the method for preventing frost damage is generally adopted at present. The method has the characteristics of low cost, simplicity and feasibility. Until now, early strength functional components such as chloride, sulfate, nitrate, calcium formate and the like have been developed successively, and a plurality of composite early strength agents are produced and applied on the basis of the early strength agents.
At present, with the increasing progress of technology and the gradual improvement of market and the continuous improvement of engineering requirements, the traditional early strength agent can not meet the requirements of green and high-performance concrete. The traditional early strength agent weakens the later strength of the concrete, accelerates the corrosion of the reinforcing steel bars in the concrete and increases the risk of sulfate corrosion damage, in addition, the mixing amount of the organic early strength agent is difficult to control, the hydration products in the concrete are complex and changeable, and the early strength agent is difficult to be fully utilized after being compounded with the inorganic salt early strength agent. Patent 201710509963.8 discloses a method for preparing a concrete early strength agent, which comprises mixing cellulose, acetamide and water, adjusting pH with sodium hydroxide solution, reacting while maintaining the temperature, adding bromooctadecane, mixing, filtering, collecting the filter residue, washing, air drying, collecting the air-dried product, reacting with tetrahydrofuran, n-butyl lithium and dimethylformamide, discharging, collecting the discharged product, mixing with gamma-aminopropyltriethoxysilane, distilling, mixing the distillation residue with nanometer titanium dioxide and aluminum silicate, collecting the mixture, and stirring. On one hand, the preparation process utilized by the patent is complex and is difficult to carry out large-scale production, and on the other hand, the early strength agent is difficult to effectively improve the strength of the concrete at each age period when being mixed into the concrete. For another example, patent 201910437581.8 discloses a concrete early strength agent and a preparation method thereof, the preparation method is simple, and can slow down the corrosion of steel bars in concrete to a certain extent, but the early strength agent contains chloride ions and sulfate ions, which is a hidden danger of burying for weakening the durability of the concrete in the later period. In addition, the raw material for preparing the early strength agent contains a sodium nitrite component, and although the antifreezing performance is good, the toxic sodium nitrite is difficult to meet the requirement of green buildings.
In conclusion, the existing concrete early strength agent has the defects that the strength of concrete at each age is difficult to effectively improve, the durability of the concrete is weakened, and the requirement of green buildings cannot be met.
Disclosure of Invention
The purpose is as follows: in order to overcome the defects in the prior art, the invention provides an MXene modified concrete early strength agent and a preparation method thereof, and solves the problems that the early strength of the existing early strength agent is not obviously improved, the later strength is reduced and the durability is reduced.
The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an MXene modified concrete early strength agent comprises the following components:
20-50 parts of MXene;
5-35 parts of acetate;
15-35 parts of bromide;
10-20 parts of calcium fluoride;
and 2-10 parts of triethanolamine.
Further, MXene is Ti3C2Tx、Ti2CTx、V2CTx、Nb2One of CTx, wherein Tx is an-OH function or/and a-F function.
Further, the acetate is sodium acetate, or a mixture of sodium acetate and calcium acetate.
Further, in the mixture of sodium acetate and calcium acetate, the weight fraction ratio of calcium acetate to sodium acetate is 1: (1-4).
Further, the bromide is one of lithium bromide, sodium bromide and calcium bromide or a mixture of the two.
Further, when the bromide is a mixture of lithium bromide and sodium bromide, the mass fraction ratio of the lithium bromide to the sodium bromide is (2.5-6): 1.
further, when the bromide is a mixture of lithium bromide and calcium bromide, the mass fraction ratio of the lithium bromide to the calcium bromide is 1: (3-5).
Further, when the bromide is a mixture of calcium bromide and sodium bromide, the mass fraction ratio of the calcium bromide to the sodium bromide is (1.5-4): 1.
a preparation method of an MXene modified concrete early strength agent comprises the following steps:
MXene, acetate, calcium fluoride and bromide are mixed uniformly in a mixer in proportion, and then triethanolamine is added to obtain the early strength agent through grinding.
Has the advantages that: the MXene modified concrete early strength agent provided by the invention has the characteristics of improving the early strength of concrete, keeping the continuous increase of the later strength of concrete and improving the durability of concrete; the components are chlorine-free, low in alkali, early strong at low temperature and low in mixing amount, and all meet the requirements of green buildings. The preparation method of the MXene modified concrete early strength agent provided by the invention is simple in process, convenient to implement and free from interference of site environment.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
An MXene modified concrete early strength agent comprises the following components in parts by weight: 30 parts of MXene; 20 parts of sodium acetate; 25 parts of sodium bromide; 20 parts of calcium fluoride; and 5 parts of triethanolamine.
The preparation method of the MXene modified concrete early strength agent comprises the following steps:
MXene, sodium acetate, calcium fluoride and sodium bromide are mixed uniformly in a mixer in proportion, and then triethanolamine is added to obtain the early strength agent.
Example 2
An MXene modified concrete early strength agent comprises the following components in parts by weight: MXene 25 parts; 30 parts of sodium acetate; 25 parts of sodium bromide; 10 parts of calcium fluoride; 10 parts of triethanolamine.
Example 3
An MXene modified concrete early strength agent comprises the following components in parts by weight: MXene 28 parts; 35 parts of sodium acetate; 15 parts of sodium bromide; 20 parts of calcium fluoride; and 2 parts of triethanolamine.
Example 4
An MXene modified concrete early strength agent comprises the following components in parts by weight: MXene 25 parts; 30 parts of sodium acetate; 20 parts of sodium bromide; 20 parts of calcium fluoride; and 5 parts of triethanolamine.
Example 5
An MXene modified concrete early strength agent comprises the following components in parts by weight: MXene 35 parts; 15 parts of sodium acetate; 15 parts of calcium acetate; 4 parts of lithium bromide; 16 parts of calcium bromide; 10 parts of calcium fluoride; and 5 parts of triethanolamine.
Example 6
An MXene modified concrete early strength agent comprises the following components in parts by weight: MXene 35 parts; 25 parts of sodium acetate; 15 parts of calcium acetate; 10 parts of lithium bromide; 3 parts of sodium bromide; 10 parts of calcium fluoride; and 2 parts of triethanolamine.
Example 7
An MXene modified concrete early strength agent comprises the following components in parts by weight: MXene 35 parts; 25 parts of sodium acetate; 12 parts of calcium bromide; 3 parts of sodium bromide; 20 parts of calcium fluoride; and 5 parts of triethanolamine.
The preparation method of the early strength agent of the embodiments 2 to 7 is the same as that of the embodiment 1, and the description is omitted.
Performance test experiment one: according to the water-cement ratio of 0.5 and the mortar ratio of 1:3, the early strength agents obtained in the examples 1-7 are respectively added to form standard cement mortar test pieces, and the weight ratio of the early strength agents to cement is 2: 100. The cement is conch P.O.42.5 ordinary portland cement; and maintaining 3d, 7d and 28d age standard mortar test blocks at the ambient temperature of 20 ℃ and the ambient humidity of 95%, wherein 3 blocks are taken out of each group. And after the maintenance of the test piece is finished, testing the compressive strength of the cement mortar test piece according to the standard, and recording and calculating a test value. The comparative example is a test block without the early strength agent, and the experimental results are shown in the following table 1:
TABLE 1 mechanical property table for cement mortar test pieces
And (3) data analysis: as can be seen from Table 1, the 3d compressive strength of the cement mortar doped with the early strength agent is increased by 102% to the maximum, the flexural strength is increased by 61% to the maximum, and then the strength is kept to be increased at a high speed all the time; the highest increase of the 7d compressive strength reaches 97 percent, and the highest increase of the flexural strength reaches 158 percent; the highest increase of 28d compressive strength is as high as 69%. When the early strength agent component contains more bromide, the early strength of the mortar is higher; when the acetate accounts for more in the early strength agent component, the early strength of the early strength agent is increased faster, and the increasing trend is consistent and lasts for 28 days or even longer. Therefore, the early strength agent provided by the invention can greatly improve the early strength of concrete, and the later strength of the early strength agent is further increased.
Performance test experiment two: the water-cement ratio is 0.5, the cement-sand ratio is 1:3, the early strength agent obtained in the embodiment 1-7 is added to form a cement-cement mortar test piece, the size of the test piece is phi 100mm multiplied by 50mm, and the weight ratio of the early strength agent to the cement is 2: 100; the cement is sea snail brand P.O.42.5 ordinary portland cement. The chlorine ion permeability coefficient of the test piece was obtained by the RCM unsteady-state electromigration test after curing for 28d at an ambient temperature of 20 ℃ and an ambient humidity of 95%, as shown in Table 2 below. The comparative example is a test block without the incorporation of an early strength agent.
TABLE 2 table of chloride ion permeability coefficient of each test piece
And (3) data analysis: as can be seen from Table 2 above, when the samples are compared with the blank samples, the permeability of the chlorine ions of the test pieces doped with the early strength agent is reduced, and the permeability coefficient of the weakenable chlorine ions reaches 55% at the highest and is 20% at the lowest. The cement mortar test piece has strong resistance to chloride ion permeability. After concrete is doped with the MXene modified concrete early strength agent, the resistance of the concrete to corrosion of chloride ions is obviously improved, and the durability of the concrete is improved.
Performance test experiment three: the water-cement ratio is 0.5, the mortar ratio is 1:3, the early strength agent obtained in the examples 1-7 is added to form cement mortar test pieces, the size of the test pieces is 40mm multiplied by 160mm, the weight ratio of the early strength agent to the cement is 2:100, the cement is conch P.O.42.5 ordinary portland cement. At an ambient temperature of 20 ℃ and an ambient humidity of 95%Adding saturated Ca (OH) at a certain temperature2Soaking in the solution for 91 days, maintaining, drying, standing for one day, and adding 5% Na2SO4The solution was immersed for one day, and this was repeated 15 times, and after 30 days, the weight of the test piece was measured to calculate the weight loss rate. The calculation formula is as follows:
in this formula, W0Means the initial weight, W, of the specimen after 91 days of curing30The weight of the test piece after repeated immersion treatment for 30 days, and M is the weight loss rate.
The weight loss rate of each test piece was as shown in table 3 below, and the comparative example was a test piece not doped with the early strength agent.
TABLE 3 weight loss ratio of each test piece
| Test piece | Comparative example | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Example 7 |
| Rate of weight loss | 1.10% | 0.78% | 0.84% | 0.50% | 0.24% | 0.67% | 0.74% | 0.54% |
| Rate of decrease | - | 29% | 24% | 55% | 78% | 39% | 33% | 51% |
And (3) data analysis: from the above table 3, it can be found that the weight loss rate of the cement mortar is obviously reduced after the modified early strength agent of the invention is added, compared with the comparative example, the reduction rate is 78% at most and 24% at least, and the sulfate erosion resistance of the cement mortar test piece is enhanced.
The concrete early strength agent has the characteristics of improving the early strength of concrete, increasing the later strength and improving the durability of the concrete by combining the three performance test results.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (9)
1. An MXene modified concrete early strength agent is characterized in that: comprises the following components:
20-50 parts of MXene;
5-35 parts of acetate;
15-35 parts of bromide;
10-20 parts of calcium fluoride;
and 2-10 parts of triethanolamine.
2. The MXene modified concrete early strength agent of claim 1, wherein: the MXene is Ti3C2Tx、Ti2CTx、V2CTx、Nb2One of CTx, wherein Tx is an-OH function or/and a-F function.
3. The MXene modified concrete early strength agent of claim 1, wherein: the acetate is sodium acetate or a mixture of sodium acetate and calcium acetate.
4. The MXene modified concrete early strength agent of claim 3, wherein: in the mixture of sodium acetate and calcium acetate, the weight fraction ratio of calcium acetate to sodium acetate is 1: (1-4).
5. The MXene modified concrete early strength agent of claim 1, wherein: the bromide is one of lithium bromide, sodium bromide and calcium bromide or a mixture of the two.
6. The MXene modified concrete early strength agent of claim 5, wherein: when the bromide is a mixture of lithium bromide and sodium bromide, the mass fraction ratio of the lithium bromide to the sodium bromide is (2.5-6): 1.
7. the MXene modified concrete early strength agent of claim 5, wherein: when the bromide is a mixture of lithium bromide and calcium bromide, the mass fraction ratio of the lithium bromide to the calcium bromide is 1: (3-5).
8. The MXene modified concrete early strength agent of claim 5, wherein: when the bromide is a mixture of calcium bromide and sodium bromide, the mass fraction ratio of the calcium bromide to the sodium bromide is (1.5-4): 1.
9. the preparation method of the MXene modified concrete early strength agent of any one of claims 1-8, wherein the preparation method comprises the following steps: the method comprises the following steps:
MXene, acetate, calcium fluoride and bromide are mixed uniformly in a mixer in proportion, and then triethanolamine is added to obtain the early strength agent through grinding.
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| CN202010122359.1A CN111116082A (en) | 2020-02-27 | 2020-02-27 | MXene modified concrete early strength agent and preparation method thereof |
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Citations (7)
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| CN101200354A (en) * | 2007-11-30 | 2008-06-18 | 苏州二建建筑集团有限公司 | Concrete super instant coagulant |
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| CN104446047A (en) * | 2014-12-25 | 2015-03-25 | 河南理工大学 | Two-dimensional nanomaterial reinforced high-mixing-content fly ash cement and preparation method thereof |
| CN104710128A (en) * | 2015-03-11 | 2015-06-17 | 东南大学 | Super early strength accelerator for portland cement concrete |
| WO2018016780A1 (en) * | 2016-07-18 | 2018-01-25 | 이지스 주식회사 | Calcium compound-containing high-early strength mixture for cement concrete and production method therefor |
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2020
- 2020-02-27 CN CN202010122359.1A patent/CN111116082A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101200354A (en) * | 2007-11-30 | 2008-06-18 | 苏州二建建筑集团有限公司 | Concrete super instant coagulant |
| CN101993209A (en) * | 2009-08-25 | 2011-03-30 | 聂雨淼 | Cement concrete early strength agent |
| CN101864285A (en) * | 2010-06-13 | 2010-10-20 | 西南石油大学 | Deepwater cementing low-temperature early strength agent |
| CN102491671A (en) * | 2011-11-18 | 2012-06-13 | 大连科诺科技发展有限公司 | Concrete nano water-reducing super high-early-strength agent |
| CN104446047A (en) * | 2014-12-25 | 2015-03-25 | 河南理工大学 | Two-dimensional nanomaterial reinforced high-mixing-content fly ash cement and preparation method thereof |
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Application publication date: 20200508 |