CN113461381A - Heat transfer enhanced SiC concrete and preparation method thereof - Google Patents

Heat transfer enhanced SiC concrete and preparation method thereof Download PDF

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CN113461381A
CN113461381A CN202110775999.7A CN202110775999A CN113461381A CN 113461381 A CN113461381 A CN 113461381A CN 202110775999 A CN202110775999 A CN 202110775999A CN 113461381 A CN113461381 A CN 113461381A
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concrete
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cement
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CN113461381B (en
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李庆文
尹雅
乔兰
邓乃夫
郭红臣
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University of Science and Technology Beijing USTB
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00991—Uses not provided for elsewhere in C04B2111/00 for testing
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/10—Geothermal energy

Abstract

The invention provides heat transfer enhanced SiC concrete and a preparation method thereof, belonging to the technical field of concrete. The concrete comprises: the heat transfer reinforced concrete comprises ordinary concrete and SiC, wherein the ordinary concrete comprises cement, sand, stones, water, SiC and other mass replacement sand, the mass percentage of the SiC in the heat transfer reinforced concrete is less than or equal to 15%, and the proportion is adjusted according to actual conditions. The preferred concrete contains the following cement, sand, gravel and water in proportion: 450 parts of cement, 609 parts of sand and SiC, 1136 parts of stones and 205 parts of water. During preparation, the cement, the sand, the stones and the SiC are dry-mixed to uniformly mix the materials; adding water into the mixed dry mixture, and continuously stirring; after the materials are fully mixed, the slump is rapidly measured, and the slump can meet the requirement of opposite sex when the slump is 55-75 mm. The heat transfer enhanced SiC concrete prepared by the invention can increase the heat conductivity coefficient and improve the heat transfer efficiency while ensuring the strength of the concrete, and has simple preparation process and low cost.

Description

Heat transfer enhanced SiC concrete and preparation method thereof
Technical Field
The invention relates to the technical field of concrete, in particular to heat transfer enhanced SiC concrete and a preparation method thereof.
Background
The energy pile is a novel underground heat exchanger ground source heat pump system (hereinafter referred to as a novel heat pump system), namely, a heat exchange pipe is directly embedded in a pile foundation of a building, the heat exchange with the surrounding rock and soil body is completed by utilizing the heat conduction performance of concrete, and the heat transfer with an upper building structure is realized, so that the effect that the building is warm in winter and cool in summer is achieved.
Originally, a ground source heat pump needs to be independently provided with a field for operations such as drilling and installation of a pipe laying heat exchanger, and the step is completely separated from the construction of a pile foundation. But now the two are combined together, so that a large amount of land space is saved, and the popularization of cities is facilitated; meanwhile, the independent drilling for the ground source heat pump is not needed, and only the buried pipe is needed to be installed before the pile is poured, so that the drilling cost is saved, and part of the cost is saved; moreover, because the heat conductivity coefficient of the concrete material is higher than that of a plurality of soils, and the backfilling compactness is good, the pipe-embedded heat exchanger is arranged in the pile foundation and has better heat transfer performance than a drilling pipe-embedded form, so that the concrete material has good heat exchange effect when being used as the backfilling material of the ground source heat pump. Therefore, after the energy pile technology is used for the first time in austria in 1984, the technology is rapidly and widely used in countries of europe and america, and in recent years, some projects in China also use the energy pile technology.
At present, the research on energy piles at home and abroad mainly focuses on two major directions of optimizing a pipe burying form and improving the heat conducting property of pile materials, and the heat exchange efficiency of a pile foundation and surrounding rock and soil bodies is improved by a plurality of aspects such as a heat transfer mechanism and heat exchange enhancement, thermodynamic structural response, pile group effect and the like. In the current research, the strength of some typical concrete, such as steel fiber concrete, is improved to a certain extent, but the heat conductivity is improved to a limited extent, and the cost is increased. The graphite concrete has greatly improved heat conductivity and obvious loss of strength, which is not favorable for the safety of the structure.
Disclosure of Invention
The invention aims to provide heat transfer enhanced SiC concrete and a preparation method thereof, which can improve the heat conductivity coefficient, increase the heat transfer efficiency and improve the thermal property and the mechanical property of the common concrete while ensuring the strength of the common concrete.
The heat transfer enhanced SiC concrete is characterized in that sand is partially replaced by SiC and other mass parts in common concrete, wherein the common concrete is prepared from cement, sand, stones and water, and the mass percentage of SiC in the heat transfer enhanced SiC concrete is less than or equal to 15%.
Wherein, the mass ratio of cement, sand and SiC to stone and water is: 400 to 470 parts of cement, 586 to 750 parts of sand and SiC, 1050 to 1200 parts of stones, 190 to 210 parts of water.
Preferably, the mass ratio of the cement to the sand to the SiC to the stone to the water is as follows: 450 parts of cement, 609 parts of sand and SiC, 1136 parts of stones and 205 parts of water.
The SiC is industrial 36-mesh black SiC with the mass content of more than 95 percent.
The cement is P.O.42.5-grade portland cement. The sand and the stone have good gradation, low mud content, stable chemical property and strong sulfate corrosion resistance.
The heat conductivity coefficient of the heat transfer reinforced SiC concrete with the SiC content of 5 percent by mass is 1.922W/(m.K) under the temperature environment of 25 ℃.
The heat conductivity coefficient of the heat transfer reinforced SiC concrete with the SiC content of 10 percent by mass is 2.206W/(mK) under the temperature environment of 25 ℃.
The heat conductivity coefficient of the heat transfer reinforced SiC concrete with the SiC content of 15 percent by mass is 2.47W/(m.K) under the temperature environment of 25 ℃.
The preparation method of the heat transfer enhanced SiC concrete comprises the following steps:
(1) dry-mixing cement, sand, SiC and stones to uniformly mix the materials;
(2) adding water into the fully mixed dry mixture, and continuously stirring;
(3) and after the materials are fully mixed, rapidly measuring the slump, and when the slump is 55-75mm, meeting the workability requirement to prepare the heat transfer reinforced SiC concrete.
The technical scheme of the invention has the following beneficial effects:
according to the scheme, the heat transfer enhanced type SiC concrete is prepared, the heat conductivity coefficient can be increased and the heat transfer efficiency can be improved while the strength of the concrete is ensured, and the preparation process is simple and low in cost.
Drawings
FIG. 1 is a graph showing the thermal conductivity of concrete with different SiC content according to an embodiment of the present invention;
FIG. 2 is a heat transfer pattern of a heat transfer enhanced concrete according to an embodiment of the present invention;
FIG. 3 is a graph showing the compressive strength of concretes 7d and 28d of different SiC contents according to an embodiment of the present invention;
FIG. 4 is a flow chart of a preparation method of the heat transfer enhanced SiC concrete in the embodiment of the invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides heat transfer enhanced SiC concrete and a preparation method thereof.
For a better understanding of the invention by the skilled person, the energy stake will first be explained:
in the construction engineering, the pile foundation refers to a deep foundation consisting of piles and pile caps connected to the tops of the piles, or a single pile foundation consisting of columns connected to the pile foundation. The pile foundation has the features of high bearing capacity, small settling amount, etc. and is used widely in engineering of different geological conditions, especially in heavy building on soft foundation. The energy pile is a heat pump system with heat exchange tubes embedded in the pile foundation, shallow geothermal energy is obtained from the earth surface by utilizing the heat pump system, the good heat conduction performance of concrete is fully utilized, and heat exchange elements are formed with the surroundings to a large extent.
The manner of embedding/embedding the heat exchange tube is various, and exemplarily, the heat exchange tube is embedded/embedded in concrete by using an arrangement of a U-shape, a double U-series shape, a triple U-shape, a double W-shape, or a spiral shape.
In the invention, the heat transfer enhanced SiC concrete replaces partial sand by SiC and other mass in common concrete, wherein the common concrete is prepared from cement, sand, stones and water, and the mass percentage of SiC in the heat transfer enhanced SiC concrete is less than or equal to 15%.
The heat transfer reinforced SiC concrete of the invention adds SiC in the common concrete, and has the following characteristics:
(1) the heat conductivity coefficient of the graphite is far higher than that of metal materials such as iron, copper and the like, and is slightly smaller than that of graphite;
(2) the SiC has good chemical stability, is acid and alkali resistant and corrosion resistant at normal temperature, and does not react with components in the cement. The heat conductivity of the concrete can be improved without affecting the hydration heat of the concrete.
(3) The SiC has high hardness, high strength and no water absorption, has powder texture similar to that of sand, and is suitable for replacing fine aggregate.
Therefore, the reinforced heat transfer type concrete prepared by adding the SiC material into the concrete is expected to greatly enhance the heat transfer capability of the concrete while ensuring the strength of the concrete, so that the heat exchange efficiency of the energy pile is improved, and a brand new and effective basis is provided for improving the heat benefit of the energy pile.
As shown in fig. 4, the preparation method of the heat transfer enhanced SiC concrete includes the following steps:
(1) dry-mixing cement, sand, SiC and stones to uniformly mix the materials;
(2) adding water into the fully mixed dry mixture, and continuously stirring;
(3) and after the materials are fully mixed, rapidly measuring the slump, and when the slump is 55-75mm, meeting the workability requirement to prepare the heat transfer reinforced SiC concrete.
The following description is given with reference to specific examples.
Example 1
The present example provides a heat transfer reinforced SiC concrete, and the following analysis is performed to more intuitively reflect the heat transfer effect of the heat transfer reinforced SiC concrete. The heat transfer reinforced concrete comprises: the heat transfer reinforced concrete comprises ordinary concrete and SiC, wherein the ordinary concrete comprises cement, sand, stones and water, the SiC is regarded as fine aggregate to replace the sand by equal mass, and the mass percentage of the SiC in the heat transfer reinforced concrete is less than or equal to 15%. The reinforced heat transfer type concrete prepared by adding the SiC material into the concrete is expected to greatly enhance the heat transfer capability of the concrete while ensuring the strength of the concrete, thereby improving the heat exchange efficiency of the energy pile.
Illustratively, the proportion of cement, sand, gravel and water in the concrete is as follows: 400-470 parts of cement, 190-210 parts of water, 586-750 parts of sand and SiC, and 1050-1200 parts of stones. In this embodiment, it is preferable that the concrete contains cement, sand, SiC, gravel, and water in the following proportions: 450 parts of cement, 609 parts of sand and SiC, 1136 parts of stones and 205 parts of water, which are in mass ratio.
Further, SiC was regarded as a fine aggregate, and sand was replaced with an equal amount of SiC to obtain a heat transfer reinforced concrete, wherein the particle size of the added SiC was substantially the same as that of the sand for concrete, and the SiC content was about 95% in industrial 36-mesh black silicon carbide. On the one hand, the heat conductivity coefficient of SiC is far higher than that of metal materials such as iron, copper and the like, and is slightly smaller than that of graphite. On the other hand, SiC has good chemical stability, is acid and alkali resistant and corrosion resistant at normal temperature, and does not react with components in cement. The heat conductivity of the concrete can be improved without affecting the hydration heat of the concrete. In addition, SiC has high hardness, high strength, does not absorb water, has a powder texture similar to that of sand, and is suitable as a substitute for fine aggregate.
The SiC is used as fine aggregate, and the sand is replaced by the ordinary concrete with medium quality, so that the heat conductivity coefficient of the ordinary concrete is greatly increased while the strength of the ordinary concrete is ensured. To verify the thermal conductivity of the heat transfer enhanced SiC concrete, the present example was conducted according to the addition of different mass percentages of SiC as independent variable to the concrete. The mass percentage of SiC in the heat transfer enhanced concrete is less than or equal to 15%, and for example, the mass percentages of SiC in the following are 0 (i.e. common concrete), 5%, 10%, and 15%, respectively, and the experimental process and the test results are described in detail:
firstly, a temperature detection system for testing the thermal conductivity of all samples is determined, and in this embodiment, the temperature detection system is preferably a DRE-III multifunctional rapid thermal conductivity tester (hereinafter referred to as a thermal conductivity tester) which tests the thermal conductivity of the samples by using a transient plane heat source method. The principle of measuring the thermophysical property of the material by the transient plane heat source method is based on the transient temperature response generated by a disc-shaped heat source of step heating in an infinite medium. A plane probe is made of heat-resistant materials and is used as a heat source and a temperature sensor. The relationship of the thermal resistivity of nickel to temperature and resistance is linear, that is, the loss of heat can be known by knowing the change of resistance, thereby reflecting the heat conducting performance of each sample.
Next, determining a probe for the thermal conductivity tester, preferably, in this embodiment, the HotDisk is used as the probe of the thermal conductivity tester, and the material of the probe is metallic nickel, and the resistance value of the material is sensitive to temperature.
After the devices are selected, the samples to be tested need to be grouped. Specifically, the number of the samples of the heat transfer enhanced concrete with the SiC mass content of 0 is 3, and the group number is A; the number of the samples of the heat transfer reinforced concrete with the SiC mass content of 5 percent is 3, and the group number is B; the number of the samples of the heat transfer reinforced concrete with the SiC mass content of 10% is 3, and the group number is C; the number of the samples of the heat transfer reinforced concrete with the SiC mass content of 15% is 3, and the group number is D. A total of 12 specimens were divided into 4 groups, and each specimen was 100mm by 100 mm.
Further, each group was tested for thermal conductivity under a temperature environment of 25 ℃ and the average value of the test of 3 samples of each group was taken as the value of the thermal conductivity of the shuffled group, and the test results are shown in table 1.
TABLE 1 concrete thermal conductivity values for different SiC contents
Figure BDA0003154830230000061
The average of each set of test results was taken as the thermal conductivity of the set at that temperature and a thermal conductivity-temperature graph was plotted, as shown in fig. 1.
With continued reference to fig. 1, the thermal conductivity of group a is 1.581W/(m · K) at 25 ℃; the thermal conductivity of group B is 1.922W/(m.K); the thermal conductivity of group C is 2.206W/(m.K); the thermal conductivity of group D was 2.470W/(m.K). The thermal conductivity of group D was improved by a factor of 1.56 compared to group a. For the remaining temperatures, the values of the thermal conductivity of each group are shown in Table 1, and are not further described herein.
In addition, the heat exchange value of the heat transfer enhanced concrete can be further determined, specifically:
calculating the heat exchange between the exchange liquid in the heat exchange tube and the surrounding rock-soil body according to the following formula:
Figure BDA0003154830230000062
wherein, T1And T4Respectively the temperature, R, of the exchange fluid and the rock-soil massTThe total thermal resistance of the energy pile system.
Calculation formula of total thermal resistance: rT＝RF+RP+RC+RSWherein R isFIs a liquid flow thermal resistance value; rPThe thermal resistance of the heat exchange tube; rCThe heat transfer enhanced concrete thermal resistance value is obtained; rSThe thermal resistance value of the rock-soil mass.
The calculation formula of the liquid flow thermal resistance value is as follows:
Figure BDA0003154830230000063
wherein, γiThe radius of the inner pipeline, d the number of the heat exchange pipes and h the convection heat transfer coefficient; the heat exchange tube thermal resistance value is calculated by the following formula:
Figure BDA0003154830230000064
wherein r is0Is the external pipe radius of the heat exchange pipe, gammaiIs the inner pipe radius, kpThe heat conductivity coefficient of the pipeline metal material of the heat exchange pipe, and n is the number of piles; the heat transfer enhanced concrete thermal resistance value is calculated according to the following formula:
Figure BDA0003154830230000065
wherein r isbFor pile foundationsRadius, kcIn order to be the thermal conductivity of the heat transfer concrete material,
Figure BDA0003154830230000071
is the effective radius.
It is worth mentioning that, referring to fig. 2, the present invention focuses on increasing the thermal conductivity k of the heat transfer concrete materialcFor reducing the heat transfer enhanced concrete thermal resistance RC. The original temperature line is shown as a dotted line, and when the heat conductivity coefficient k of the heat transfer concrete material is improvedcThe post temperature line is shown as a solid line. The temperature of the concrete-soil interface is increased from T4 to T4', and the heat exchange efficiency of the energy pile is improved under the condition of reducing the thermal resistance.
Example 2
In this example, in order to determine the compressive strength of the concrete and effectively reflect the influence of SiC on the mechanical properties of the concrete, the cubic compressive tests were performed after the concrete samples were cured for 7d and 28d, respectively. Four groups of test blocks, namely ordinary concrete with the SiC content of 0 percent and heat transfer reinforced concrete with the SiC content of 5 percent, 10 percent and 15 percent, are prepared, the size of the test block is 100mm multiplied by 100mm, the test block is a non-standard size cubic compression-resistant test block, the size conversion coefficient needs to be 0.95, and the concrete material of each cube of the concrete is the same as that of the example 1. And loading three test blocks in each group, and taking the arithmetic average value of the compressive strengths of the three test blocks as a final result.
Before the test is started, the concrete test block is taken out of the curing chamber, and the surface of the test sample and the upper and lower bearing plates of the press are wiped clean. The sample is placed on the lower bearing plate of the testing machine, and the center of the sample is aligned with the centers of the upper and lower bearing plates. And starting the testing machine to enable the upper bearing plate to be close to the sample and leave a certain gap, and then formally starting loading. According to the requirements of the standard of the test method of the mechanical property of common concrete (GB/T energy pile multi-medium heat transfer enhancement and heat exchange analysis-28-50081-2002), the design strength of a sample is between 20C 30 and C60, and the loading speed of a press is 0.5 to 0.8 Mpa/s. The compressive strength statistics for all samples are listed in table 2.
TABLE 2 compressive Strength of concrete with different SiC content
Figure BDA0003154830230000081
As can be seen from the table, the concrete samples with different SiC contents all have improved 28d strength compared with 7d strength. The compressive strength of the common concrete 28d with the SiC content of 0 percent is 46.64MPa, which is increased by 10.87MPa compared with the strength of 7d and is improved by 33.17 percent; the compressive strength of the 5% SiC concrete 28d is 43.43MPa, which is increased by 11.24MPa compared with the 7d strength and is improved by 34.92%; the compressive strength of the 10% SiC concrete 28d is 45.62MPa, which is increased by 10.77MPa compared with the strength of 7d and is improved by 30.90%; the 15% SiC concrete 28d has the compressive strength of 46.61MPa, 11.49MPa higher than that of 7d, and 32.72% higher than that of 7 d. The compressive strengths of the concretes 7d and 28d with different SiC contents were plotted, resulting in fig. 3:
referring to fig. 3, when the SiC content is 5%, the compressive strength of 7d and 28d of the concrete is not greatly different from that of the common C40 concrete, the two values are close to each other and only differ by about 0.12MPa and 0.2MPa, but when the SiC content reaches 10%, the concrete strength is obviously improved, and the 28d compressive strength of the concrete is increased by 1.98MPa and is increased by 4.5% compared with the common concrete. When the SiC content reaches 15%, the 28d compressive strength of the concrete is increased by 2.97MPa and the increase amplitude is 6.8% compared with that of the common concrete. This indicates that the presence of SiC can increase the strength of the concrete.
Example 3
The present embodiment provides a method for preparing heat transfer reinforced concrete, which is applied to the heat transfer reinforced concrete according to the first embodiment. As shown in fig. 4, the preparation method of the heat transfer enhanced concrete comprises the following steps:
step one, carrying out dry mixing on cement, sand, stones and SiC to uniformly mix the materials;
step two, adding a certain amount of water into the dry mixture obtained by fully mixing the materials, and continuously stirring;
and step three, after the materials are fully mixed, rapidly measuring the slump, and when the slump is 55-75mm, meeting the requirement of opposite sex, thus preparing the heat transfer reinforced concrete.
It should be noted that the above "adding a certain amount of water" is an empirical value, and the effect is to make the slump of the mixture reach 150mm, so as to obtain concrete with better heat transfer effect. Slump is the workability of concrete and is used for judging whether construction can be normally carried out.
Workability refers to the property of whether the concrete is easy to construct and operate and is uniform and compact, and is a very comprehensive property including fluidity, cohesiveness and water retention. The influence on the workability mainly comprises the water consumption per unit volume, the water-cement ratio, the sand rate, the cement variety, the aggregate condition, the time, the temperature, the additive and the like.
The heat transfer enhanced concrete prepared by the method has the advantages of increased heat conductivity coefficient and enhanced heat transfer efficiency.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (9)

1. A heat transfer enhanced SiC concrete is characterized in that: the sand is partially replaced by SiC with equal mass in the common concrete, wherein the common concrete is prepared from cement, sand, stones and water, and the mass percentage of SiC in the heat transfer enhanced SiC concrete is less than or equal to 15%.
2. The heat transfer enhanced SiC concrete according to claim 1, characterized in that: the mass ratio of the cement to the sand to the SiC to the pebbles to the water is as follows: 400 to 470 parts of cement, 586 to 750 parts of sand and SiC, 1050 to 1200 parts of stones, 190 to 210 parts of water.
3. The heat transfer enhanced SiC concrete according to claim 2, characterized in that: the mass ratio of the cement to the sand to the SiC to the pebbles to the water is as follows: 450 parts of cement, 609 parts of sand and SiC, 1136 parts of stones and 205 parts of water.
4. The heat transfer enhanced SiC concrete according to claim 1, characterized in that: the SiC is industrial 36-mesh black SiC with the mass content of more than 95%.
5. The heat transfer enhanced SiC concrete according to claim 1, characterized in that: the cement is P.O.42.5-grade portland cement.
6. The heat transfer enhanced SiC concrete according to claim 1, characterized in that: the heat conductivity coefficient of the heat transfer reinforced SiC concrete with the SiC content of 5 percent by mass is 1.922W/(m.K) under the temperature environment of 25 ℃.
7. The heat transfer enhanced SiC concrete according to claim 1, characterized in that: the heat conductivity coefficient of the heat transfer reinforced SiC concrete with the SiC content of 10 percent by mass is 2.206W/(mK) under the temperature environment of 25 ℃.
8. The heat transfer enhanced SiC concrete according to claim 1, characterized in that: the heat conductivity coefficient of the heat transfer reinforced SiC concrete with the SiC content of 15 percent by mass is 2.47W/(m.K) under the temperature environment of 25 ℃.
9. The method for preparing the heat transfer enhanced SiC concrete according to claim 1, characterized in that: the method comprises the following steps:
(1) dry-mixing cement, sand, SiC and stones to uniformly mix the materials;
(2) adding water into the fully mixed dry mixture, and continuously stirring;
(3) and after the materials are fully mixed, rapidly measuring the slump, and when the slump is 55-75mm, meeting the workability requirement to prepare the heat transfer reinforced SiC concrete.
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CN111854227A (en) * 2020-07-03 2020-10-30 郑州大学 High-heat-conductivity energy pile and manufacturing method thereof
CN112441785A (en) * 2020-12-09 2021-03-05 王瑞 Electric heating concrete plate for heating and preparation method thereof

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