CN111056758A - Large-volume concrete heat-conducting fluid based on MXene and preparation method thereof - Google Patents
Large-volume concrete heat-conducting fluid based on MXene and preparation method thereof Download PDFInfo
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- CN111056758A CN111056758A CN201911264723.1A CN201911264723A CN111056758A CN 111056758 A CN111056758 A CN 111056758A CN 201911264723 A CN201911264723 A CN 201911264723A CN 111056758 A CN111056758 A CN 111056758A
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- mxene
- conducting fluid
- concrete heat
- heat
- volume concrete
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/32—Carbides; Nitrides; Borides ; Silicides
- C04B14/322—Carbides
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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
Abstract
The invention discloses a MXene-based mass concrete heat-conducting fluid and a preparation method thereof in the technical field of mass concrete temperature control and crack prevention, and aims to solve the technical problem that in the prior art, when water is used as a heat transfer medium to carry out temperature control and crack prevention treatment on mass concrete, the temperature control and crack prevention efficiency is influenced due to the low heat conductivity coefficient of the water. The components of the large-volume concrete heat-conducting fluid comprise MXene, a dispersing agent and solvent water.
Description
Technical Field
The invention relates to a large-volume concrete heat-conducting fluid based on MXene and a preparation method thereof, and belongs to the technical field of temperature control and crack prevention of large-volume concrete.
Background
In the construction process of the large-volume concrete, more heat is generated during the hydration of cement, so that the internal temperature of the concrete is increased rapidly. Because the concrete heat conductivity coefficient is low, the temperature difference between the inside and the outside of the concrete structure is large; in addition, the restriction condition of the internal and external structures of the concrete is limited, the large temperature difference causes the internal tensile stress of the concrete, when the tensile stress exceeds the tensile strength of the concrete, the concrete structure generates more temperature cracks, and therefore the bearing capacity, the water resistance, the service life and the like of the concrete structure are greatly influenced, and therefore temperature control anti-cracking measures are needed to be adopted in the construction process of the large-volume concrete.
At present, the temperature control and crack prevention measure for mass concrete is mainly implemented by reducing adiabatic temperature rise and temperature difference so as to control the generation of temperature cracks, and the main measures are respectively carried out from two aspects of mix proportion design and construction control. The design of the mix proportion mainly comprises: (1) preferably selecting cement varieties, such as medium-low heat cement and the like; (2) adding additives such as retarder and the like; (3) high-quality mineral admixtures such as slag, fly ash and the like are used. The construction control mainly comprises: (1) controlling the warehousing temperature of concrete, such as adding ice, precooling aggregate and the like; (2) pouring in layers, and controlling the pouring quality of concrete; (3) pre-burying a cooling water pipe to control temperature rise; (4) and monitoring the internal temperature and stress of the concrete in real time. Among them, the arrangement of cooling water pipes in mass concrete is a very important and highly efficient temperature control anti-cracking measure.
The heat transfer medium used in the traditional mass concrete cooling water pipe is water, and the water has the advantages of large specific heat capacity, good pumpability and the like, so that the water is widely applied in engineering practice as the heat transfer medium. But the heat conductivity coefficient of water is lower, so that the temperature control anti-cracking efficiency is influenced. Therefore, there is a great need for a new heat transfer fluid having higher heat transfer efficiency while maintaining good pumping performance.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a mass concrete heat-conducting fluid based on MXene and a preparation method thereof, so as to solve the technical problem that when water is used as a heat transfer medium to carry out temperature control anti-cracking treatment on mass concrete in the prior art, the temperature control anti-cracking efficiency is influenced because the heat conductivity coefficient of the water is low.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the MXene-based large-volume concrete heat-conducting fluid comprises MXene, a dispersing agent and solvent water.
Preferably, the content of MXene or/and the dispersant is 0.01-1% by mass.
Preferably, the dispersant comprises at least any one of SDBS, SDS, CTAB.
Preferably, the content of MXene is 1% by mass and the content of CTAB is 1% by mass.
Preferably, the MXene comprises Ti3C2Tx、Ti2CTx、V2CTx、Nb2At least any one of CTx, wherein Tx is an-OH functional group or/and a-F functional group.
Preferably, the solvent water is deionized water.
In order to achieve the above object, the present invention further provides a method for preparing an MXene-based bulk concrete heat transfer fluid, wherein the method comprises the following steps:
stirring the mixed MXene, the dispersant and the solvent water;
and (3) carrying out ultrasonic dispersion on the stirred MXene, the dispersing agent and the solvent water.
Preferably, the mixing of MXene, dispersant and solvent water is stirred, comprising:
and stirring the mixed MXene, the dispersing agent and the solvent water at the speed of 400-600 rpm for not less than 30 min.
Preferably, the ultrasonic dispersion time is not less than 60 min.
Preferably, the prepared mass concrete heat-conducting fluid is protected by argon.
Compared with the prior art, the invention has the following beneficial effects:
(1) MXene materials are a class of two-dimensional transition metal carbide or nitride crystals with a thickness of only a single atom or a few atoms, and have a high thermal conductivity, higher than that of most metallic and semiconductor low-dimensional materials. Thus adding MXene to water will help increase the thermal conductivity of the water. MXene has various types and high thermal conductivity coefficient, and the thermal-conductive fluid prepared by mixing the MXene with the aqueous solution has high thermal conductivity coefficient, so that the types of media selected during preparation of the thermal-conductive fluid are greatly increased.
(2) Unlike graphene, which is highly hydrophobic, the terminating groups (-F, ═ O and-OH) on the surface of MXene provide high hydrophilicity, so MXene can be relatively easily dispersed in water. The use of the dispersant can enable MXene to be well dispersed in water uniformly and to be stably present for a long time.
(3) After the heat-conducting fluid is uniformly mixed by mechanical stirring during preparation, ultrasonic dispersion is adopted, and the cavitation effect when ultrasonic wave acts on the medium liquid is utilized, so that high temperature and high pressure are locally generated in the liquid, huge impact force and microjet are generated, the surface energy of the nano particles is weakened under the action of the nano particles, the further dispersion effect on the nano particles is realized, and the heat-conducting fluid has better pumpability.
(4) The MXene heat-conducting fluid is stored in a storage vessel after being prepared and is introduced with argon gas for protection, and the argon gas is inert gas and is not easy to participate in chemical reaction, so that the MXene heat-conducting fluid can be prevented from being oxidized, and the shelf life of the MXene heat-conducting fluid can be effectively prolonged.
(5) The invention has simple preparation process, convenient operation and good dispersibility, and can be widely applied to the temperature control and crack prevention of mass concrete.
Detailed Description
The invention is further described below. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The specific embodiment of the invention provides a large-volume concrete heat-conducting fluid based on MXene and a preparation method thereof, wherein the heat-conducting fluid and the preparation method thereof are as follows:
example 1
0.05g of Ti3C2Tx is added into 49.95g of water, stirred for 30min at the stirring speed of 600rpm and uniformly mixed, and then subjected to ultrasonic dispersion for 60min to obtain the uniformly dispersed and stable MXene heat-conducting fluid. In the MXene heat-conducting fluid, the MXene content is 0.1% by mass, and the water content is 99.9% by mass.
Example 2
0.25g of Ti3C2Tx is added into 49.75g of water, stirred for 30min at the stirring speed of 600rpm and uniformly mixed, and then subjected to ultrasonic dispersion for 60min to obtain the uniformly dispersed and stable MXene heat-conducting fluid. In the MXene heat-conducting fluid, the MXene content is 0.5% by mass, and the water content is 99.5% by mass.
Example 3
0.5g of Ti3C2Tx is added into 49.5g of water, stirred for 30min at the stirring speed of 600rpm and mixed uniformly, and then subjected to ultrasonic dispersion for 60min to obtain the uniformly dispersed and stable MXene heat-conducting fluid. In the MXene heat-conducting fluid, the MXene content is 1% by mass, and the water content is 99% by mass.
Example 4
0.05g of Ti3C2Tx and 0.5g SDBS are added into 49.45g water, stirred for 30min at the stirring speed of 600rpm and mixed evenly, and then ultrasonic dispersion is carried out for 60min, thus obtaining the MXene heat-conducting fluid which is evenly dispersed and stable. In the MXene heat-conducting fluid, the MXene content is 0.1% by mass, the SDBS content is 1% by mass, and the water content is 98.9% by mass.
Example 5
0.25g of Ti3C2Tx and 0.5g SDBS are added into 49.25g water, stirred for 30min at the stirring speed of 600rpm and mixed evenly, and then subjected to ultrasonic dispersion for 60min to obtain the MXene heat-conducting fluid which is evenly dispersed and stable. In the MXene heat-conducting fluid, the MXene content is 0.5% by mass, the SDBS content is 1% by mass, and the water content is 98.5% by mass.
Example 6
0.5g of Ti3C2Tx and 0.5And adding gSDBS into 49g of water, stirring at the stirring speed of 600rpm for 30min, uniformly mixing, and performing ultrasonic dispersion for 60min to obtain the uniformly dispersed and stable MXene heat-conducting fluid. In the MXene heat-conducting fluid, the MXene content is 1% by mass, the SDBS content is 1% by mass, and the water content is 98% by mass.
Example 7
0.5g of Ti3C2Tx and 0.5g CTAB are added into 49g of water, stirred for 30min at the stirring speed of 600rpm and uniformly mixed, and then subjected to ultrasonic dispersion for 60min to obtain the uniformly dispersed and stable MXene heat-conducting fluid. In the MXene heat-conducting fluid, the MXene content is 1% by mass, the CTAB content is 1% by mass, and the water content is 98% by mass.
Next, the dispersion effect and the heat conduction effect of the seven MXene heat conduction fluids are compared, where table 1 shows the dispersion effect of the dispersant SDBS on the MXene heat conduction fluid, table 2 shows the dispersion effect of the dispersant SDBS and CTAB on the MXene heat conduction fluid, and table 3 shows the heat conduction coefficients of the MXene heat conduction fluids with different components.
Table 1: dispersion effect of SDBS on MXene heat-conducting fluid
As can be seen from table 1, the prepared MXene heat transfer fluid has good dispersion effect under the condition of not adding the dispersant and adding the dispersant, but after standing for 2 hours, the MXene heat transfer fluid without adding the dispersant is already layered, the MXene material is deposited to the bottom of the test tube, and the MXene heat transfer fluid with 1% of the dispersant SDBS is better in dispersibility than the MXene heat transfer fluid without adding the dispersant, and particularly when the MXene content is 0.5% and the dispersant SDBS content is 1%, the dispersibility is still good after standing for 2 hours.
Table 2: dispersion effect of SDBS and CTAB on MXene heat-conducting fluid
As can be seen from table 2, after 2 hours of standing, significant delamination of the MXene thermal fluid without dispersant had occurred and MXene material deposited on the bottom of the tube. And the MXene heat-conducting fluid doped with the SDBS dispersant and CTAB dispersant has better dispersibility than that without the SDBS dispersant. After standing for 120 hours, the MXene heat transfer fluid mixed with the dispersant SDBS has obvious layering phenomenon, and MXene materials are deposited at the bottom of the test tube. And the MXene heat-conducting fluid doped with the dispersant CTAB still keeps better dispersibility. Therefore, both SDBS and CTAB have better dispersibility in a shorter time, and CTAB has better long-term dispersion effect than SDBS.
As can be seen from tables 1 and 2, the MXene particles in the MXene heat-conducting fluid after the dispersant is used are uniformly dispersed, the viscosity is low, the fluidity is good, and the pumpability is good, so that the MXene heat-conducting fluid can be well applied to temperature control and crack prevention of mass concrete.
Table 3: thermal conductivity of MXene heat-conducting fluid with different components
| Heat transfer fluid composition | Coefficient of thermal conductivity (W/m. K) | Rate of increase |
| Pure water | 0.599 | --- |
| 0.1％MXene+1％SDBS | 0.681 | 13.7％ |
| 0.5％MXene+1％SDBS | 0.707 | 18.0％ |
| 1％MXene+1％SDBS | 0.715 | 19.4％ |
| 1％MXene+1％CTAB | 0.716 | 19.5％ |
As can be seen from table 3, as the mixing amount of MXene increases, the thermal conductivity of the MXene heat-conducting fluid gradually increases, and when the mixing dispersant is SDBS and the mixing amount of MXene is 0.1%, 0.5% and 1%, the thermal conductivity is 0.681W/(m · K), 0.707W/(m · K) and 0.715W/(m · K), respectively, the thermal conductivity increases by 13.7%, 18.0% and 19.4%, respectively, compared with the thermal conductivity of pure water without MXene of 0.599W/(m · K), and thus, the thermal conductivity of the heat-conducting fluid can be significantly increased by mixing MXene. Therefore, the MXene heat-conducting fluid can effectively improve the heat transfer efficiency of mass concrete.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The MXene-based large-volume concrete heat-conducting fluid is characterized by comprising MXene, a dispersing agent and solvent water.
2. The MXene-based large-volume concrete heat-conducting fluid as claimed in claim 1, wherein the MXene or/and the dispersant is 0.01-1% by mass.
3. The MXene-based high-volume concrete heat transfer fluid of claim 2, wherein the dispersant comprises at least any one of SDBS, SDS, CTAB.
4. The MXene-based large-volume concrete heat-conducting fluid as claimed in claim 3, wherein the MXene content is 1% by mass and the CTAB content is 1% by mass.
5. The MXene-based bulk concrete heat transfer fluid of claim 1, wherein the MXene comprises Ti3C2Tx、Ti2CTx、V2CTx、Nb2At least any one of CTx, wherein Tx is an-OH functional group or/and a-F functional group.
6. The MXene-based high-volume concrete heat transfer fluid of claim 1, wherein the solvent water is deionized water.
7. A method for preparing the MXene-based large-volume concrete heat-conducting fluid, which is characterized in that the method carries out component control on the MXene-based large-volume concrete heat-conducting fluid according to any one of claims 1 to 6, and the method comprises the following steps:
stirring the mixed MXene, the dispersant and the solvent water;
and (3) carrying out ultrasonic dispersion on the stirred MXene, the dispersing agent and the solvent water.
8. The method for preparing the MXene-based large-volume concrete heat-conducting fluid according to claim 7, wherein the mixing of MXene, the dispersing agent and the solvent water comprises:
and stirring the mixed MXene, the dispersing agent and the solvent water at the speed of 400-600 rpm for not less than 30 min.
9. The method for preparing the MXene-based large-volume concrete heat-conducting fluid according to claim 7, wherein the ultrasonic dispersion time is not less than 60 min.
10. The method for preparing the MXene-based large-volume concrete heat-transfer fluid according to claim 7, wherein the prepared large-volume concrete heat-transfer fluid is protected by argon gas.
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2019
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU767167A1 (en) * | 1978-04-25 | 1980-09-30 | Производственное Объединение "Техэнергохимпром" | Combined heat-carrier |
| US4211665A (en) * | 1978-10-26 | 1980-07-08 | Gulf Research And Development Company | Electrical apparatus insulated with a high fire point synthetic alkylaromatic fluid |
| JPS575784A (en) * | 1980-06-12 | 1982-01-12 | Kiribai Kagaku Kogyo Kk | Cooling agent |
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