CN114735988A - Cement-based heat-conducting mortar and preparation method thereof - Google Patents
Cement-based heat-conducting mortar and preparation method thereof Download PDFInfo
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- CN114735988A CN114735988A CN202210363067.6A CN202210363067A CN114735988A CN 114735988 A CN114735988 A CN 114735988A CN 202210363067 A CN202210363067 A CN 202210363067A CN 114735988 A CN114735988 A CN 114735988A
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- 239000004568 cement Substances 0.000 title claims abstract description 75
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 64
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000000835 fiber Substances 0.000 claims abstract description 18
- 239000002253 acid Substances 0.000 claims abstract description 10
- 239000011230 binding agent Substances 0.000 claims abstract description 10
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 10
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims description 28
- 238000002156 mixing Methods 0.000 claims description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 15
- 239000011398 Portland cement Substances 0.000 claims description 13
- 239000006004 Quartz sand Substances 0.000 claims description 13
- 150000004645 aluminates Chemical class 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 12
- 239000002893 slag Substances 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 9
- 239000004917 carbon fiber Substances 0.000 claims description 9
- 229920002748 Basalt fiber Polymers 0.000 claims description 8
- 239000004743 Polypropylene Substances 0.000 claims description 8
- 150000004767 nitrides Chemical class 0.000 claims description 8
- -1 polypropylene Polymers 0.000 claims description 8
- 229920001155 polypropylene Polymers 0.000 claims description 8
- 229910052582 BN Inorganic materials 0.000 claims description 7
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 7
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 7
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 7
- 239000004020 conductor Substances 0.000 claims description 6
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 6
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 6
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 6
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 6
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical group OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 6
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical group Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 4
- 238000005336 cracking Methods 0.000 abstract description 7
- 238000012546 transfer Methods 0.000 abstract description 3
- 238000009827 uniform distribution Methods 0.000 abstract description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 10
- 229910052782 aluminium Inorganic materials 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 5
- 238000002791 soaking Methods 0.000 description 4
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 3
- 238000005034 decoration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—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
- C04B28/06—Aluminous 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of heat-conducting mortar. The invention provides cement-based heat-conducting mortar which comprises the following components in parts by mass: 50-60 parts of cement; 65-75 parts of aggregate; 15-25 parts of heat conduction material; 2-5 parts of a polycarboxylic acid water reducing agent; 5-12 parts of fibers; 3-5 parts of a water-retaining agent; 6-15 parts of a binder; 55-75 parts of water. The invention also provides a preparation method of the cement-based heat-conducting mortar. By reasonably selecting the components and controlling the proportion of the components, the obtained cement-based heat-conducting mortar has the advantages of high heat conductivity coefficient, quick heat transfer, uniform distribution, high compressive strength and flexural strength, good toughness and cohesiveness and good cracking resistance.
Description
Technical Field
The invention relates to the technical field of heat-conducting mortar, in particular to cement-based heat-conducting mortar and a preparation method thereof.
Background
The ground radiation heating (floor heating) system has the advantages of good thermal stability, energy conservation, high efficiency, high safety performance, no indoor area occupation and the like, gradually replaces the traditional wall-mounted heating mode in recent years, and has wide application prospect. The traditional floor heating process adopts an aluminum film as a soaking film, although the aluminum film has high heat conduction speed, the concrete or mortar covered on the aluminum film contains active ion Cl-1The aluminum film can be corroded, and after the aluminum film is used for a period of time, the aluminum film is corroded to lose heat conduction performance, and the soaking effect is difficult to ensure. Secondly, as the existing floor heating plates mostly adopt thin floor heating plates with grooves for pipe laying, the over-thick aluminum films are difficult to be embedded into the grooves, so that the laying effect is poor; and an excessively thin aluminum film has poor heat conductivity. Moreover, the cost of the floor heating system is greatly increased due to the expensive price of the aluminum film. Other replacements in the marketThe soaking film of the aluminum film often has the problems of poor heat conduction effect and soaking effect, poor mechanical property, poor cohesiveness and easy cracking.
Therefore, the research and development of the cement-based heat-conducting mortar which improves the heat-conducting effect, the mechanical property and the cohesiveness and avoids the cracking problem has important value and significance.
Disclosure of Invention
The invention aims to provide cement-based heat-conducting mortar and a preparation method thereof aiming at the defects of the prior art, and aims to solve the problems of poor heat-conducting effect, poor mechanical property, poor cohesiveness and easy cracking of the cement-based heat-conducting mortar in the prior art.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides cement-based heat-conducting mortar which comprises the following components in parts by mass:
preferably, the cement comprises portland cement and aluminate cement, and the mass ratio of the portland cement to the aluminate cement is 1-2: 1.
Preferably, the aggregate comprises quartz sand and blast furnace slag powder in a mass ratio of 2-4: 1; the particle sizes of the quartz sand and the blast furnace slag powder are independent and are 50-100 mu m.
Preferably, the heat conduction material comprises graphite powder and nitride in a mass ratio of 2-4: 1; the nitride is aluminum nitride or boron nitride.
Preferably, the fibers comprise basalt fibers, polypropylene fibers and carbon fibers in a mass ratio of 2-3: 1-2: 2-3.
Preferably, the water retaining agent is hydroxypropyl methyl cellulose ether, and the binder comprises rubber powder and ethylene-vinyl acetate copolymerized rubber powder in a mass ratio of 2-3: 1-2.
The invention also provides a preparation method of the cement-based heat-conducting mortar, which comprises the following steps:
1) mixing cement, aggregate, a polycarboxylic acid water reducing agent, a water retaining agent and a binder to obtain a mixture;
2) and mixing the mixture, the heat conduction material, the fiber and water to obtain the cement-based heat conduction mortar.
Preferably, the mixing time in the step 1) is 5-15 min; the mixing time in the step 2) is 10-20 min.
Preferably, the mixing in the step 1) and the step 2) is carried out under the condition of stirring, and the stirring speed is 500-800 r/min.
The beneficial effects of the invention include:
by reasonably selecting the components and controlling the proportion of the components, the obtained cement-based heat-conducting mortar has the advantages of high heat conductivity coefficient, quick heat transfer, uniform distribution, high compressive strength and flexural strength, good toughness and cohesiveness and good cracking resistance.
Detailed Description
The invention provides cement-based heat-conducting mortar which comprises the following components in parts by mass:
the cement-based heat-conducting mortar comprises 50-60 parts of cement, preferably 53-58 parts of cement, and more preferably 55-56 parts of cement.
The cement preferably comprises Portland cement and aluminate cement, and the mass ratio of the Portland cement to the aluminate cement is preferably 1-2: 1, and more preferably 1.5: 1.
The Portland cement provided by the invention has a basic coagulation effect, the aluminate cement generates high early strength after hardening, the later strength is stably increased, and after the cement-based heat-conducting mortar is solidified, the Portland cement, the aluminate cement, the aggregate, the heat-conducting material and the fiber are tightly connected together, so that the compressive strength, the flexural strength, the viscosity strength and the waterproof performance of the cement-based mortar can be improved.
The cement-based heat-conducting mortar comprises 65-75 parts of aggregate, preferably 67-72 parts, more preferably 69-71 parts, and even more preferably 70 parts.
The aggregate of the invention preferably comprises quartz sand and blast furnace slag powder; the mass ratio of the quartz sand to the blast furnace slag powder is preferably 2-4: 1, and more preferably 3: 1; the particle size of the quartz sand and the particle size of the blast furnace slag powder are independent, preferably are 50-100 mu m, more preferably are 70-90 mu m, and even more preferably are 80 mu m.
The aggregate can ensure the strength of the cement-based heat-conducting mortar, the quartz sand has higher hardness and strength, and the quartz sand and the blast furnace slag powder are combined according to a specific proportion, so that the strength, hardness and toughness of the heat-conducting mortar are obviously improved.
The cement-based heat-conducting mortar comprises 15-25 parts of heat-conducting materials, preferably 17-23 parts, more preferably 19-21 parts, and even more preferably 20 parts.
The heat conducting material of the present invention preferably comprises graphite powder and nitride; the mass ratio of the graphite powder to the nitride is preferably 2-4: 1, and more preferably 3: 1; the nitride is preferably aluminum nitride or boron nitride.
The heat conduction material has higher heat conduction coefficient, good heat conduction effect and stable heat conduction performance; the surface of the graphite powder contains a large number of active oxygen-containing functional groups, so that the interface interaction between cement hydrated crystals and the surface of the graphite powder can be improved, and the toughness is improved; the proportion of the graphite powder and the nitride can obviously improve the heat-conducting property of the cement-based heat-conducting mortar, the heat-conducting material can effectively fill the pores in the mortar, and the proportion of the heat-conducting material and the cement can ensure that the cement-based mortar has good mechanical property and heat-conducting property.
The cement-based heat-conducting mortar comprises 2-5 parts of a polycarboxylic acid water reducing agent, preferably 3-4 parts, and more preferably 3.5 parts.
The polycarboxylic acid water reducing agent disclosed by the invention can reduce mixing water, reduce the water-cement ratio, improve the durability of the heat-conducting mortar and improve the strength and the fluidity of the mortar.
The cement-based heat-conducting mortar comprises 5-12 parts of fibers, preferably 6-11 parts, more preferably 7-10 parts, and even more preferably 8-9 parts.
The fibers of the present invention preferably comprise basalt fibers, polypropylene fibers, and carbon fibers; the mass ratio of the basalt fibers to the polypropylene fibers to the carbon fibers is preferably 2-3: 1-2: 2-3, and more preferably 2.5:1.5: 2.5.
The fiber provided by the invention ensures that the mortar forms a net-shaped heat conduction structure after being cured, can effectively prevent early shrinkage cracks of the cement-based heat conduction mortar, obviously reduces the shrinkage rate of the mortar, improves the impermeability of the mortar, and improves the toughness of the mortar.
The cement-based heat-conducting mortar comprises 3-5 parts of a water-retaining agent, preferably 3.5-4.5 parts, and further preferably 4 parts; the water retaining agent is preferably hydroxypropyl methyl cellulose ether.
The cement-based heat-conducting mortar comprises 6-15 parts of a binder, preferably 8-13 parts, more preferably 9-11 parts, and even more preferably 10 parts.
The adhesive preferably comprises rubber powder and ethylene-vinyl acetate copolymerized rubber powder, and the mass ratio of the rubber powder to the ethylene-vinyl acetate copolymerized rubber powder is preferably 2-3: 1-2, and more preferably 2.5: 1.5.
The binder, the cement and the aggregate are combined according to a specific proportion, so that the toughness and the anti-cracking capability of the cement-based heat-conducting mortar can be improved, and the water retention property, the durability and the wear resistance of the heat-conducting mortar can be improved; the consumption of the binder is too small, the cohesive force of the heat-conducting mortar is poor, the cement and the aggregate cannot be well wrapped together, and the strength of the heat-conducting mortar is low; when the amount of the binder exceeds the proportion of the present invention, the strength and the binding property of the thermal mortar are not remarkably improved.
The cement-based heat-conducting mortar comprises 55-75 parts of water, preferably 60-70 parts of water, and more preferably 63-66 parts of water.
The invention also provides a preparation method of the cement-based heat-conducting mortar, which comprises the following steps:
1) mixing cement, aggregate, a polycarboxylic acid water reducing agent, a water retaining agent and a binder to obtain a mixture;
2) and mixing the mixture, the heat conduction material, the fiber and water to obtain the cement-based heat conduction mortar.
The mixing time in the step 1) of the invention is preferably 5-15 min, more preferably 7-12 min, and even more preferably 9-10 min; the mixing time in the step 2) is preferably 10-20 min, more preferably 12-18 min, and even more preferably 14-16 min.
The mixing in step 1) and step 2) of the invention is preferably carried out under stirring conditions, and the stirring speed is preferably 500-800 r/min, more preferably 600-700 r/min, and even more preferably 630-650 r/min.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
2.6kg of portland cement, 2.6kg of aluminate cement, 4.4kg of quartz sand (particle size of 55 μm), 2.2kg of blast furnace slag powder (particle size of 60 μm), 0.2kg of a polycarboxylic acid water reducing agent, 0.3kg of hydroxypropyl methyl cellulose ether, 0.4kg of rubber powder and 0.2kg of ethylene-vinyl acetate copolymer rubber powder were mixed for 6min, and the mixing was carried out at a stirring rate of 550r/min to obtain a uniform mixture. And mixing the mixture with 1kg of graphite powder, 0.5kg of aluminum nitride, 0.2kg of basalt fiber, 0.1kg of polypropylene fiber, 0.2kg of carbon fiber and 5.6kg of water at a stirring speed of 550r/min for 12min to obtain the cement-based heat-conducting mortar.
Example 2
4kg of portland cement, 2kg of aluminate cement, 6kg of quartz sand (particle size of 95 μm), 1.5kg of blast furnace slag powder (particle size of 90 μm), 0.5kg of a polycarboxylic acid water reducing agent, 0.5kg of hydroxypropyl methyl cellulose ether, 0.9kg of rubber powder and 0.6kg of ethylene-vinyl acetate copolymer rubber powder were mixed for 13min at a stirring rate of 750r/min to obtain a uniform mixture. And mixing the mixture with 2kg of graphite powder, 0.5kg of boron nitride, 0.45kg of basalt fiber, 0.3kg of polypropylene fiber, 0.45kg of carbon fiber and 7.2kg of water at a stirring speed of 750r/min for 18min to obtain the cement-based heat-conducting mortar.
Example 3
3.3kg of portland cement, 2.2kg of aluminate cement, 5.25kg of quartz sand (particle size of 75 μm), 1.75kg of blast furnace slag powder (particle size of 75 μm), 0.4kg of polycarboxylic acid water reducing agent, 0.4kg of hydroxypropyl methyl cellulose ether, 0.6kg of rubber powder and 0.4kg of ethylene-vinyl acetate copolymer rubber powder were mixed for 10min, and the mixing was carried out at a stirring rate of 650r/min to obtain a uniform mixture. And mixing the mixture with 1.5kg of graphite powder, 0.5kg of boron nitride, 0.3kg of basalt fiber, 0.3kg of polypropylene fiber, 0.3kg of carbon fiber and 6.5kg of water at a stirring speed of 650r/min for 15min to obtain the cement-based heat-conducting mortar.
Comparative example 1
The mass of the portland cement and the aluminate cement in example 3 was changed to 2.2kg and 3.3kg, respectively, and the polycarboxylic acid water reducing agent and the carbon fiber were omitted, and the other conditions were the same as in example 3.
Comparative example 2
The mass of graphite powder and boron nitride in example 3 were changed to 1kg and 1kg, respectively, and the particle diameters of quartz sand and blast furnace slag powder were changed to 200 μm, and rubber powder was omitted, and the other conditions were the same as in example 3.
Comparative example 3
The boron nitride of example 3 was changed to the same mass of fine silica powder, the masses of basalt fiber, polypropylene fiber and carbon fiber were changed to 0.5kg, 0.1kg and 0.2kg, respectively, and the mass of portland cement was changed to 5.5kg, so that aluminate cement was omitted, and the other conditions were the same as in example 3.
The cement-based heat-conducting mortar of the examples 1-3 and the comparative examples 1-3 are respectively cured for 28 days at room temperature, and the compressive strength and the flexural strength are tested according to JC/T985-; testing the tensile bonding strength of the mortar according to JGJ/T70-2009 Standard test method for basic Performance of building mortar; according to GB/T10295-.
TABLE 1 Performance test results for different cement-based thermally conductive mortars
As can be seen from Table 1, the cement-based heat-conducting mortar of the invention has the advantages of high heat conductivity coefficient, fast heat transfer, uniform distribution, high compressive strength and rupture strength, good toughness and cohesiveness and good cracking resistance. According to comparative examples 1 to 3, the heat conductivity coefficient, the bonding strength and the mechanical property of the cement-based heat-conducting mortar are obviously reduced by changing the components, the component proportion and the component particle size of the cement-based heat-conducting mortar.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The cement-based heat-conducting mortar is characterized by comprising the following components in parts by mass:
2. the cement-based heat-conducting mortar according to claim 1, wherein the cement comprises portland cement and aluminate cement, and the mass ratio of the portland cement to the aluminate cement is 1-2: 1.
3. The cement-based heat-conducting mortar according to claim 1 or 2, wherein the aggregate comprises quartz sand and blast furnace slag powder in a mass ratio of 2-4: 1; the particle sizes of the quartz sand and the blast furnace slag powder are independent and are 50-100 mu m.
4. The cement-based heat-conducting mortar according to claim 3, wherein the heat-conducting material comprises graphite powder and nitride in a mass ratio of 2-4: 1; the nitride is aluminum nitride or boron nitride.
5. The cement-based heat-conducting mortar according to claim 4, wherein the fibers comprise basalt fibers, polypropylene fibers and carbon fibers in a mass ratio of 2-3: 1-2: 2-3.
6. The cement-based heat-conducting mortar as claimed in claim 4 or 5, wherein the water retention agent is hydroxypropyl methyl cellulose ether, and the binder comprises rubber powder and ethylene-vinyl acetate copolymer powder in a mass ratio of 2-3: 1-2.
7. The preparation method of the cement-based thermal mortar according to any one of claims 1 to 6, characterized by comprising the following steps:
1) mixing cement, aggregate, a polycarboxylic acid water reducing agent, a water-retaining agent and a binder to obtain a mixture;
2) and mixing the mixture, the heat conduction material, the fiber and water to obtain the cement-based heat conduction mortar.
8. The preparation method according to claim 7, wherein the mixing time in the step 1) is 5-15 min; the mixing time in the step 2) is 10-20 min.
9. The preparation method of claim 7 or 8, wherein the mixing in step 1) and step 2) is carried out under stirring at a speed of 500-800 r/min.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115259866A (en) * | 2022-07-20 | 2022-11-01 | 韩涛 | Heat-conducting castable and preparation method thereof |
| CN116102287A (en) * | 2023-04-11 | 2023-05-12 | 中交一公局第六工程有限公司 | Binding material for building and preparation method thereof |
| CN116535123A (en) * | 2023-04-19 | 2023-08-04 | 东南大学 | Concrete heat-conducting aggregate and preparation method and application thereof |
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