CN111039628A - Concrete heat storage material and preparation method thereof - Google Patents
Concrete heat storage material and preparation method thereof Download PDFInfo
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- CN111039628A CN111039628A CN201811191781.1A CN201811191781A CN111039628A CN 111039628 A CN111039628 A CN 111039628A CN 201811191781 A CN201811191781 A CN 201811191781A CN 111039628 A CN111039628 A CN 111039628A
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- 239000004567 concrete Substances 0.000 title claims abstract description 64
- 239000011232 storage material Substances 0.000 title claims abstract description 56
- 238000005338 heat storage Methods 0.000 title claims abstract description 55
- 238000002360 preparation method Methods 0.000 title abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000010459 dolomite Substances 0.000 claims abstract description 34
- 229910000514 dolomite Inorganic materials 0.000 claims abstract description 34
- 239000000835 fiber Substances 0.000 claims abstract description 27
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 18
- 239000010881 fly ash Substances 0.000 claims abstract description 18
- 239000010959 steel Substances 0.000 claims abstract description 18
- 239000004568 cement Substances 0.000 claims abstract description 16
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 15
- 150000004645 aluminates Chemical class 0.000 claims abstract description 15
- 239000004917 carbon fiber Substances 0.000 claims abstract description 15
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 229920001778 nylon Polymers 0.000 claims description 12
- 238000005303 weighing Methods 0.000 claims description 10
- 230000008018 melting Effects 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 238000007580 dry-mixing Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000002994 raw material Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 20
- 238000004146 energy storage Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000010248 power generation Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000002657 fibrous material Substances 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- C04B28/06—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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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
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 relates to a concrete heat storage material and a preparation method thereof, wherein the concrete heat storage material is prepared by mixing the following components in parts by mass: 8.5-11.4 parts of aluminate cement, 7.0-7.5 parts of fly ash, 35-45 parts of dolomite coarse aggregate, 30-38 parts of dolomite fine aggregate, 2.0-4.0 parts of steel fiber, 0.1-0.15 part of organic fiber, 1.0-3.0 parts of carbon fiber, 6.5-7.3 parts of water and 0.3-0.7 part of water reducing agent. The concrete heat storage material is simple to prepare, the raw materials are easy to obtain, the cost is low, the heat storage performance is good, the workability is good, and the strength is high.
Description
Technical Field
The invention relates to the field of energy storage materials, in particular to a concrete heat storage material and a preparation method thereof.
Background
The consumption of conventional fossil energy has caused a series of problems such as energy shortage, environmental pollution and the like, and countries begin to focus on alternative energy. Solar energy is used as a green pollution-free energy source and draws wide attention of researchers, particularly a solar photo-thermal power generation technology, and the technology adopts a key thermal energy storage material, so that the energy is stored in the thermal energy storage material in a thermal energy form when sunlight is sufficient, and the thermal energy storage material releases heat to continuously generate power when sunlight is insufficient or at night, and the defect of unstable power generation caused by intermittent instability of sunlight is avoided.
Currently, the key energy storage materials applied to the solar photo-thermal power generation technology mainly include sensible heat storage materials which are expressed in a heat conduction oil series and a molten salt series. The heat conduction oil has the defects of flammability, easy decomposition, instability, small use temperature range and the like, and limits the development prospect of the heat conduction oil as a heat storage material. The fused salt heat storage material has the defects of high solidification point, easiness in causing 'frozen pipe' in the using process, certain corrosivity to a storage and conveying system and the like, so that the energy storage material has higher requirements on equipment, and the later-period use and maintenance cost is increased.
In view of the defects of the two main flow heat storage materials, the increasingly high requirements of the high-speed development of the photo-thermal energy storage power generation industry on the heat storage materials are met, and a heat storage material which is wider in use working temperature, safe, economical and environment-friendly is urgently developed. The concrete material has the advantages of low cost, easy construction, high specific heat, good mechanical property, good high-temperature stability and the like, so the concrete material can be used as a photo-thermal energy storage material to be applied to the fields of photo-thermal energy storage power generation and the like.
However, the existing concrete heat storage materials have obvious defects, such as poor heat storage performance due to small heat conductivity coefficient and specific heat capacity, poor workability due to large aggregate density of metal slag, complex preparation method, inapplicability to industrial production and poor economic benefit, or concrete strength reduction and easy cracking due to the added material with good heat conductivity.
Disclosure of Invention
In order to solve the problems, the invention provides a concrete heat storage material which is simple to prepare, easy to obtain raw materials, low in cost, good in heat storage performance, good in workability and high in strength, and a preparation method thereof.
The invention adopts the following technical scheme:
the concrete heat storage material is characterized by being prepared by mixing the following components in parts by mass:
8.5-11.4 parts of aluminate cement, 7.0-7.5 parts of fly ash, 35-45 parts of dolomite coarse aggregate, 30-38 parts of dolomite fine aggregate, 2.0-4.0 parts of steel fiber, 0.1-0.15 part of organic fiber, 1.0-3.0 parts of carbon fiber, 6.5-7.3 parts of water and 0.3-0.7 part of water reducing agent. The apparent density of the concrete heat storage material is 2000-3。
The particle size of the dolomite coarse aggregate is 5-25mm, and the dolomite coarse aggregate is continuously graded.
The fineness modulus of the dolomite fine aggregate is 1.6-3.7.
The length of the steel fiber is 20-60mm, the diameter is 0.5-1.0mm, and the tensile strength is more than or equal to 600 MPa.
The carbon fiber: the length is 10-30mm, the monofilament diameter is 7-10 μm, the carbon content is more than or equal to 95 percent, and the tensile strength is more than or equal to 3 GPa.
The length of the organic fiber is 5-25mm, the diameter is 20-30 μm, and the melting point is 85-100 ℃.
The organic fiber is nylon fiber.
The water reducing agent is a polycarboxylic acid type water reducing agent, and the water reducing rate is more than or equal to 25%.
The preparation method of the concrete heat storage material comprises the following steps:
(1) respectively weighing 8.5-11.4 parts of aluminate cement, 7.0-7.5 parts of fly ash, 35-45 parts of dolomite coarse aggregate, 30-38 parts of dolomite fine aggregate, 2.0-4.0 parts of steel fiber, 0.1-0.15 part of nylon fiber and 1.0-3.0 parts of carbon fiber at room temperature according to the proportion, and adding the components into a stirrer one by one for dry mixing for 2-4 min;
(2) weighing 0.3-0.7 part of water reducing agent and 6.5-7.3 parts of water, premixing, adding into a stirrer, and wet-mixing for 2-4 min. The aluminate cement has good heat resistance, no digestion hazard of calcium oxide and small thermal deformation, and is a cementing material suitable for being used as a heat storage material; ordinary portland cement has poor heat resistance and remarkably reduced heat strength.
The performance of the concrete heat storage material prepared by the invention is as follows: the apparent density is 2000-2500kg/m3The heat conductivity coefficient is 2.0-2.45W/(m.DEG C), the specific heat capacity is 1.0-1.2kJ (Kg.DEG C), the compressive strength is more than or equal to 50Mpa, and the flexural strength is more than or equal to 10 Mpa.
The concrete heat storage material disclosed by the invention has the following advantages:
1. the thick and thin aggregate is made of dolomite material with better heat conduction and specific heat performance to replace common sandstone, so that the thermal performance of the concrete can be improved, in addition, the thin aggregate is made of dolomite fine aggregate, the density of the material is lower than that of metal slag, the workability, slump and the like of the material are easier to control during the preparation of the concrete, bleeding and the like are not easy to occur, the material distribution in the system is more uniform, and the construction is convenient;
2. under the condition of ensuring the strength of concrete, a certain amount of fly ash material is added, the material has small granularity, large specific surface area and higher activity, has good filling effect on the interior of the concrete, can reduce internal pores, improve the compactness of the concrete, improve the workability of the concrete and improve the crack resistance of the concrete, and in addition, the fly ash replaces part of cement, so that the waste is changed into valuable, the cost of the concrete is reduced, and the fly ash contributes to environmental protection;
3. the steel fiber and the carbon fiber materials have excellent heat-conducting property, and the two materials are mixed and added into the concrete according to a certain proportion, so that the heat-conducting property of the concrete can be improved, the internal heat transfer is faster, the heat distribution is more uniform, in addition, the tensile strength of the two fiber materials is high, the compatibility with the concrete material is good, the expansion of internal cracks can be well hindered, the compression and bending strength of the concrete is improved, and the cracking risk of the concrete is reduced;
4. the melting point of the organic fiber material is 85-100 ℃, the organic fiber material is easier to vaporize and volatilize compared with organic fiber with higher melting point in the heating process, communicated micro air hole channels are formed, the adsorbed water in the concrete starts to vaporize and volatilize at about 100 ℃, the air hole channels can ensure that water vapor is discharged in time, the internal pressure formed by the water vapor is reduced, and the risk of concrete cracking can be greatly reduced by proper vaporization temperature;
5. the raw materials of the concrete material disclosed by the invention are directly obtained in a commercialized way, no pretreatment is needed, the cost is low, and the concrete material is suitable for actual operation and mass production.
Detailed Description
The embodiment of the invention adopts the following raw materials:
aluminate cement: from Yiruite (China) aluminate, Inc.;
fly ash: meets the requirement of II-grade ash specified in fly ash for cement and concrete GB/T1596-2017, can be purchased from Yao Xin mineral product processing factory in Lingshu county, but is not limited to the product of the company;
dolomite coarse aggregate: the grain diameter is 5-25 mm; available from Shandong Haishi building materials, Inc., but not limited thereto.
Dolomite fine aggregate: the fineness modulus is 2.8, and the product can be obtained from Shandong Haishi building materials Co, but is not limited to the product of the company.
Steel fiber: the length is 20-40mm, the diameter is 0.5-1.0mm, the tensile strength is more than or equal to 600MPa, and the end hook type steel fiber can be purchased from Nanjing Paille technology industry Co.
Carbon fiber: the length is 10-30mm, the diameter of the monofilament is 7-10 mu m, the carbon content is more than or equal to 95 percent, the tensile strength is more than or equal to 3GPa, and the composite material can be purchased from Nanjing Yidao composite material company Limited, but the product is not limited by the company.
Water reducing agent: the polycarboxylic acid type water reducing agent is available from Shandong building materials Co., Ltd, and is of a standard type, but is not limited thereto.
Nylon fiber: 5-25mm in length, 20-30 μm in diameter, and 85-100 ℃ in melting point, and is available from, but not limited to, Shaoxing textile science and technology Limited.
Example 1: concrete heat storage material 1
A concrete heat storage material comprises the following components in parts by weight: 10 parts of aluminate cement, 7 parts of fly ash, 45 parts of dolomite coarse aggregate, 30 parts of dolomite fine aggregate, 2.0 parts of steel fiber, 0.15 part of nylon fiber, 2.0 parts of carbon fiber, 6.5 parts of water and 0.6 part of water reducing agent.
Example 2: concrete heat storage material 2
A concrete heat storage material comprises the following components in parts by weight: 8.5 parts of aluminate cement, 7.5 parts of fly ash, 35 parts of dolomite coarse aggregate, 33 parts of dolomite fine aggregate, 3.0 parts of steel fiber, 0.1 part of nylon fiber, 1.0 part of carbon fiber, 6.9 parts of water and 0.3 part of water reducing agent.
Example 3: concrete heat storage material 3
A concrete heat storage material comprises the following components in parts by weight: 11.4 parts of aluminate cement, 7.5 parts of fly ash, 40 parts of dolomite coarse aggregate, 38 parts of dolomite fine aggregate, 4.0 parts of steel fiber, 0.15 part of nylon fiber, 3.0 parts of carbon fiber, 7.3 parts of water and 0.7 part of water reducing agent.
Example 4: preparation method of concrete heat storage material 1
The preparation method of the concrete heat storage material 1 comprises the following steps:
(1) respectively weighing 10 parts of aluminate cement, 7 parts of fly ash, 45 parts of dolomite coarse aggregate, 30 parts of dolomite fine aggregate, 2.0 parts of steel fiber, 0.15 part of nylon fiber and 2.0 parts of carbon fiber according to the proportion at room temperature, adding the materials into a stirrer one by one, and dry-mixing for 2-4 min;
(2) weighing 0.6 part of water reducing agent and 6.5 parts of water, premixing, adding into a stirrer, and wet-mixing for 2-4 min.
The apparent density of the concrete heat storage material 1 is 2380kg/m3。
Example 5: preparation method of concrete heat storage material 2
The preparation method of the concrete heat storage material 2 comprises the following steps:
(1) respectively weighing 8.5 parts of aluminate cement, 7.5 parts of fly ash, 35 parts of dolomite coarse aggregate, 33 parts of dolomite fine aggregate, 3.0 parts of steel fiber, 0.1 part of nylon fiber and 1.0 part of carbon fiber at room temperature according to the proportion, adding the materials into a stirrer one by one, and carrying out dry mixing for 2-4 min;
(2) weighing 0.3 part of water reducing agent and 6.9 parts of water, premixing, adding into a stirrer, and wet-mixing for 2-4 min.
Through detection, the apparent density of the concrete heat storage material 2 is 2000kg/m3。
Example 6: preparation method 3 of concrete heat storage material
The preparation method of the concrete heat storage material 3 comprises the following steps:
(1) respectively weighing 11.4 parts of aluminate cement, 7.5 parts of fly ash, 40 parts of dolomite coarse aggregate, 38 parts of dolomite fine aggregate, 4.0 parts of steel fiber, 0.15 part of nylon fiber and 3.0 parts of carbon fiber at room temperature according to the proportion, adding the materials into a stirrer one by one, and carrying out dry mixing for 2-4 min;
(2) weighing 0.7 part of water reducing agent and 7.3 parts of water, premixing, adding into a stirrer, and wet-mixing for 2-4 min.
The apparent density of the concrete heat storage material 3 is 2500kg/m through detection3。
Example 7: detection of concrete heat storage material performance
Experimental examples 1,2 and 3: concrete test blocks prepared according to the methods of examples 4-6;
comparative example 1: the formula comprises 8.5 parts of ordinary portland cement, 7.5 parts of fly ash, 35 parts of dolomite coarse aggregate, 33 parts of metal slag, 3.0 parts of steel fiber, 0.1 part of nylon fiber, 1.0 part of graphite powder, 6.9 parts of water and 0.3 part of water reducing agent; the test block obtained was prepared according to the method of example 4;
comparative example 2: 8.5 parts of aluminate cement, 7.5 parts of fly ash, 35 parts of dolomite coarse aggregate, 33 parts of dolomite fine aggregate, 3.0 parts of steel fiber, 0.1 part of polyacrylonitrile fiber (with the melting point of 160-200 ℃), 1.0 part of graphite powder, 6.9 parts of water and 0.3 part of water reducing agent; the test block obtained was prepared according to the method of example 4;
the test block is used for testing the compressive strength and the flexural strength of the test block, the compressive strength and the flexural strength after being subjected to a high temperature of 450 ℃ for 12 hours, and the thermal conductivity and the specific heat capacity of the test block according to the standard GB/T50081-2002, the compressive strength and the flexural strength of the test block are shown in tables 1 and 2, the compressive strength and the flexural strength of the test examples 1,2 and 3 are obviously higher than those of the comparative examples 1 and 2, and meanwhile, the comparative example 1 is found to have poor workability, high metal slag density and easy sinking, which shows that the mechanical property of the improved heat storage concrete material is improved, and the improved heat storage concrete material has higher specific heat capacity and thermal conductivity coefficient.
TABLE 1 Heat storage Material compression Strength and rupture Strength Meter
TABLE 2 Heat storage Performance of the Heat storage Material
| Serial number | Thermal conductivity W/(m.degree C) | Specific heat capacity KJ/(Kg. degree C) |
| 1 | 2.2 | 1.1 |
| 2 | 2.15 | 1.05 |
| 3 | 2.43 | 1.18 |
| Comparative example 1 | 2.22 | 1.00 |
| Comparative example 2 | 2.08 | 1.02 |
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. The concrete heat storage material is characterized by being prepared by mixing the following components in parts by mass:
8.5-11.4 parts of aluminate cement, 7.0-7.5 parts of fly ash, 35-45 parts of dolomite coarse aggregate, 30-38 parts of dolomite fine aggregate, 2.0-4.0 parts of steel fiber, 0.1-0.15 part of organic fiber, 1.0-3.0 parts of carbon fiber, 6.5-7.3 parts of water and 0.3-0.7 part of water reducing agent.
2. The concrete heat storage material as claimed in claim 1, wherein the apparent density of the concrete heat storage material is 2000-2500kg/m3。
3. The concrete heat storage material of claim 1, wherein the dolomite coarse aggregate has a grain size of 5-25mm and is continuously graded.
4. The concrete heat storage material as claimed in claim 1, wherein the fineness modulus of the dolomite fine aggregate is 1.6 to 3.7.
5. The concrete heat storage material of claim 1, wherein the steel fibers have a length of 20-60mm, a diameter of 0.5-1.0mm, and a tensile strength of not less than 600 MPa.
6. The concrete heat storage material of claim 1 wherein the carbon fiber: the length is 10-30mm, the monofilament diameter is 7-10 μm, the carbon content is more than or equal to 95 percent, and the tensile strength is more than or equal to 3 GPa.
7. The concrete heat storage material of claim 1 wherein the organic fibers have a length of 5-25mm, a diameter of 20-30 μm, and a melting point of 85-100 ℃.
8. The concrete heat storage material of claim 1, wherein the organic fiber is a nylon fiber.
9. The concrete heat storage material of claim 1, wherein the water reducing agent is a polycarboxylic acid type water reducing agent, and the water reducing rate is not less than 25%.
10. The method for preparing the concrete heat storage material of claims 1-9, comprising the steps of:
(1) respectively weighing 8.5-11.4 parts of aluminate cement, 7.0-7.5 parts of fly ash, 35-45 parts of dolomite coarse aggregate, 30-38 parts of dolomite fine aggregate, 2.0-4.0 parts of steel fiber, 0.1-0.15 part of nylon fiber and 1.0-3.0 parts of carbon fiber at room temperature according to the proportion, and adding the components into a stirrer one by one for dry mixing for 2-4 min;
(2) weighing 0.3-0.7 part of water reducing agent and 6.5-7.3 parts of water, premixing, adding into a stirrer, and wet-mixing for 2-4 min.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116409968A (en) * | 2023-03-21 | 2023-07-11 | 杭州舟桥建材有限公司 | Preparation method of activated water recycled concrete and recycled concrete |
| CN117447157A (en) * | 2023-10-27 | 2024-01-26 | 东南大学 | Low-temperature-rise high-heat-conductivity high-crack-resistance cement-based composite material and preparation method thereof |
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| CN102701704A (en) * | 2012-05-31 | 2012-10-03 | 武汉理工大学 | Novel heat accumulation concrete for solar thermal power station and preparation method for novel heat accumulation concrete |
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| CN104671728A (en) * | 2013-11-29 | 2015-06-03 | 中广核太阳能开发有限公司 | Concrete heat storage material for solar moderate-temperature steam electric power generation and preparation method thereof |
| CN103833302A (en) * | 2014-03-18 | 2014-06-04 | 武汉理工大学 | Phase change material wrapped thermal storage concrete and preparation method thereof |
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Application publication date: 20200421 |