CN113149560A - High-fluidity conductive concrete and preparation method thereof - Google Patents
High-fluidity conductive concrete and preparation method thereof Download PDFInfo
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- CN113149560A CN113149560A CN202110458951.3A CN202110458951A CN113149560A CN 113149560 A CN113149560 A CN 113149560A CN 202110458951 A CN202110458951 A CN 202110458951A CN 113149560 A CN113149560 A CN 113149560A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
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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
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Structural Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a high-fluidity conductive concrete and a preparation method thereof, wherein the conductive concrete comprises the following raw material components in parts by weight: 70-80 parts of cement, 8-15 parts of fly ash microbeads, 10-20 parts of conductive phase, 0-1 part of water reducing agent and 0-0.5 part of surface modifier; the mass ratio of the aggregate to the cementing material is (3-5): 1, the sand rate is 40-45%, the water-cement ratio is (0.35-0.5): 1; the preparation method comprises the following steps: putting the conductive phase, the water reducing agent and the surface modifier into water, and uniformly mixing to form a first mixture; uniformly mixing other residual raw material components to form a second mixture; and adding the first mixture into the second mixture, uniformly stirring to form newly-mixed conductive concrete slurry, forming, curing and demolding. The invention uses solid waste steel slag to replace part of graphite, thereby reducing the cost and increasing the fluidity of the fresh slurry of the conductive concrete without influencing the conductivity, and simultaneously uses the surface modifier to modify the surface of the graphite, thereby increasing the surface hydrophobic ability and improving the dispersibility of the graphite.
Description
Technical Field
The invention relates to the technical field of resource comprehensive utilization of special building materials and industrial wastes, in particular to high-fluidity conductive concrete and a preparation method thereof.
Background
The common concrete is not an insulator or a good conductor, the resistivity is more than or equal to 450 (omega.m), and the conductivity of the concrete can be greatly improved by adding a certain amount of conductive medium into the concrete, so that the concrete becomes a conductor with better conductivity. After the 90 s in the 20 th century, the research and application of conductive concrete have been greatly improved, and steel fibers, graphite, carbon fibers and other materials are doped into the concrete as conductive phase materials, so that the concrete material has certain conductivity. At present, the research and application fields of the conductive concrete mainly comprise the aspects of grounding devices, building lightning protection equipment, static elimination devices, building heating ground, deicing and snow melting, and the like.
Although the conductive concrete is already applied to actual engineering, the current research and application also face certain problems, such as conductive phase materials of granular or powdery graphite powder, carbon black and the like, which are expensive, cause the cost of the concrete to be greatly increased, and cannot form good conductive circuits and conductive networks in the concrete, cause poor conductive performance, and simultaneously, the water requirement is large and the strength is reduced when the concrete is mixed; in addition, the fiber-based material, particularly the carbon fiber material, is difficult to disperse during concrete mixing, resulting in a decrease in conductivity.
Disclosure of Invention
In view of the above, the present invention provides a high-fluidity conductive concrete and a method for preparing the same, which at least partially solve the problems in the prior art.
The invention provides high-fluidity conductive concrete which is characterized by comprising the following raw material components in parts by weight: 70-80 parts of cement, 8-15 parts of fly ash microbeads, 10-20 parts of conductive phase, 0-1 part of water reducing agent and 0-0.5 part of surface modifier.
Preferably, the mass ratio of the aggregate to the cementing material in the conductive concrete is (3-5): 1, preferably 4: 1; the sand rate is 40-45%, preferably 42%.
Preferably, the water cement ratio of the conductive concrete is (0.35-0.5): 1.
preferably, the cement is 425 Portland cement.
Preferably, the fly ash microbeads are ultrafine fly ash microbeads directly collected from a hearth of a coal-fired power plant or separated from primary fly ash.
Preferably, the conductive phase includes, but is not limited to, graphite and steel slag; in the conductive phase: 3-5 parts of graphite and 7-15 parts of steel slag.
Preferably, the surface modifier is one or more of dodecyl dimethyl betaine, sodium dodecyl sulfate and sodium dodecyl sulfate.
The invention provides a preparation method of the high-fluidity conductive concrete, which comprises the following steps: putting the conductive phase, the water reducing agent and the surface modifier into water, and uniformly mixing to form a first mixture; uniformly mixing other residual raw material components to form a second mixture; and adding the first mixture into the second mixture, uniformly stirring to form newly-mixed conductive concrete slurry, forming, curing and demolding to obtain the conductive concrete.
The technical scheme provided by the invention has the following beneficial effects: the invention uses solid waste steel slag to replace part of graphite, thereby reducing the cost and increasing the fluidity of the fresh slurry of the conductive concrete without influencing the conductivity, and simultaneously uses the surface modifier to modify the surface of the graphite, thereby increasing the surface hydrophobic ability and improving the dispersibility of the graphite.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
The experimental procedures in the following examples are conventional unless otherwise specified. The test materials used in the following examples were purchased from a general shop or the like unless otherwise specified. In the quantitative tests in the following examples, three replicates were set, and the data are the mean or the mean ± standard deviation of the three replicates.
The cement adopted in the embodiment of the invention is 425 ordinary portland cement, and the fly ash microbeads are ultrafine fly ash microbeads directly collected from a hearth of a coal-fired power plant or obtained by sorting primary fly ash.
Example 1
The embodiment provides a high-fluidity conductive concrete, which comprises the following raw material components in parts by weight: 70 parts of cement, 15 parts of fly ash microbeads and 15 parts of conductive phase; 3 parts of graphite and 12 parts of steel slag in the conductive phase; aggregate: cement 4: 1, the sand rate is 42%; water-cement ratio is 0.5: 1.
according to the raw materials, the preparation method provided by the invention is adopted to prepare the high-fluidity conductive concrete:
the method comprises the following steps: putting graphite and steel slag into water and uniformly mixing to form a first mixture;
step two: uniformly mixing other residual raw material components to form a second mixture;
step three: and adding the first mixture into the second mixture, uniformly stirring to form newly-mixed conductive concrete slurry, forming, curing and demolding to obtain the conductive concrete.
Example 2
The embodiment provides a high-fluidity conductive concrete, which comprises the following raw material components in parts by weight: 70 parts of cement, 10 parts of fly ash microbeads, 20 parts of conductive phase, 1 part of water reducing agent and 0.5 part of surface modifier; 5 parts of graphite and 15 parts of steel slag in the conductive phase; the surface modifier is dodecyl dimethyl betaine; aggregate: cement 4: 1, the sand rate is 42%; water-cement ratio is 0.35: 1.
according to the raw materials, the preparation method provided by the invention is adopted to prepare the high-fluidity conductive concrete:
the method comprises the following steps: putting graphite, steel slag, a water reducing agent and a surface modifier into water, and uniformly mixing to form a first mixture;
step two: uniformly mixing other residual raw material components to form a second mixture;
step three: and adding the first mixture into the second mixture, uniformly stirring to form newly-mixed conductive concrete slurry, forming, curing and demolding to obtain the conductive concrete.
Example 3
The embodiment provides a high-fluidity conductive concrete, which comprises the following raw material components in parts by weight: 75 parts of cement, 10 parts of fly ash microbeads, 15 parts of conductive phase, 0.5 part of water reducing agent and 0.25 part of surface modifier; in the conductive phase, 4 parts of graphite and 11 parts of steel slag; the surface modifier is sodium dodecyl sulfate; aggregate: cement 4: 1, the sand rate is 42%; water-cement ratio is 0.42: 1.
according to the raw materials, the preparation method provided by the invention is adopted to prepare the high-fluidity conductive concrete:
the method comprises the following steps: putting graphite, steel slag, a water reducing agent and a surface modifier into water, and uniformly mixing to form a first mixture;
step two: uniformly mixing other residual raw material components to form a second mixture;
step three: and adding the first mixture into the second mixture, uniformly stirring to form newly-mixed conductive concrete slurry, forming, curing and demolding to obtain the conductive concrete.
Example 4
The embodiment provides a high-fluidity conductive concrete, which comprises the following raw material components in parts by weight: 75 parts of cement, 8 parts of fly ash microbeads, 17 parts of conductive phase, 0.5 part of water reducing agent and 0.5 part of surface modifier; in the conductive phase, 4 parts of graphite and 13 parts of steel slag; the surface modifier is sodium dodecyl sulfate; aggregate: cement 4: 1, the sand rate is 42%; water-cement ratio is 0.4: 1.
according to the raw materials, the preparation method provided by the invention is adopted to prepare the high-fluidity conductive concrete:
the method comprises the following steps: putting graphite, steel slag, a water reducing agent and a surface modifier into water, and uniformly mixing to form a first mixture;
step two: uniformly mixing other residual raw material components to form a second mixture;
step three: and adding the first mixture into the second mixture, uniformly stirring to form newly-mixed conductive concrete slurry, forming, curing and demolding to obtain the conductive concrete.
Example 5
The embodiment provides a high-fluidity conductive concrete, which comprises the following raw material components in parts by weight: 80 parts of cement, 10 parts of fly ash microbeads, 10 parts of conductive phase, 1 part of water reducing agent and 0.5 part of surface modifier; in the conductive phase, 4 parts of graphite and 6 parts of steel slag; the surface modifier is sodium dodecyl sulfate and sodium dodecyl sulfate in the weight ratio of 1: 1 by mass ratio; aggregate: cement 4: 1, the sand rate is 42%; water-cement ratio is 0.4: 1.
according to the raw materials, the preparation method provided by the invention is adopted to prepare the high-fluidity conductive concrete:
the method comprises the following steps: putting graphite, steel slag, a water reducing agent and a surface modifier into water, and uniformly mixing to form a first mixture;
step two: uniformly mixing other residual raw material components to form a second mixture;
step three: and adding the first mixture into the second mixture, uniformly stirring to form newly-mixed conductive concrete slurry, forming, curing and demolding to obtain the conductive concrete.
Example 6
The embodiment provides a high-fluidity conductive concrete, which comprises the following raw material components in parts by weight: 80 parts of cement, 8 parts of fly ash microbeads, 12 parts of conductive phase, 1 part of water reducing agent and 0.5 part of surface modifier; in the conductive phase, 5 parts of graphite and 6 parts of steel slag; the surface modifier is dodecyl dimethyl betaine and sodium dodecyl sulfate in the weight ratio of 1: 1 by mass ratio; aggregate: cement 4: 1, the sand rate is 42%; water-cement ratio is 0.5: 1.
according to the raw materials, the preparation method provided by the invention is adopted to prepare the high-fluidity conductive concrete:
the method comprises the following steps: putting graphite, steel slag, a water reducing agent and a surface modifier into water, and uniformly mixing to form a first mixture;
step two: uniformly mixing other residual raw material components to form a second mixture;
step three: and adding the first mixture into the second mixture, uniformly stirring to form newly-mixed conductive concrete slurry, forming, curing and demolding to obtain the conductive concrete.
Example 7
The embodiment provides a high-fluidity conductive concrete, which comprises the following raw material components in parts by weight: 80 parts of cement, 10 parts of fly ash microbeads, 10 parts of conductive phase, 0.5 part of water reducing agent and 0.5 part of surface modifier; 3 parts of graphite and 7 parts of steel slag in the conductive phase; the surface modifier is dodecyl dimethyl betaine, sodium dodecyl sulfate and sodium dodecyl sulfate, wherein the weight ratio of the dodecyl sulfate to the sodium dodecyl sulfate is 1: 1: 1 by mass ratio; aggregate: cement 4: 1, the sand rate is 42%; water-cement ratio is 0.45: 1.
according to the raw materials, the preparation method provided by the invention is adopted to prepare the high-fluidity conductive concrete:
the method comprises the following steps: putting graphite, steel slag, a water reducing agent and a surface modifier into water, and uniformly mixing to form a first mixture;
step two: uniformly mixing other residual raw material components to form a second mixture;
step three: and adding the first mixture into the second mixture, uniformly stirring to form newly-mixed conductive concrete slurry, forming, curing and demolding to obtain the conductive concrete.
Comparative example 1
The comparative example provides a conductive concrete lacking auxiliary materials, which comprises the following raw material components in parts by weight: 90 parts of cement, 10 parts of conductive phase, 0.5 part of water reducing agent and 0.5 part of surface modifier; 3 parts of graphite and 7 parts of steel slag in the conductive phase; the surface modifier is dodecyl dimethyl betaine, sodium dodecyl sulfate and sodium dodecyl sulfate, wherein the weight ratio of the dodecyl sulfate to the sodium dodecyl sulfate is 1: 1: 1 by mass ratio; aggregate: cement 4: 1, the sand rate is 42%; water-cement ratio is 0.45: 1.
the preparation method comprises the following steps:
the method comprises the following steps: putting graphite, steel slag, a water reducing agent and a surface modifier into water, and uniformly mixing to form a first mixture;
step two: uniformly mixing other residual raw material components to form a second mixture;
step three: and adding the first mixture into the second mixture, uniformly stirring to form newly-mixed conductive concrete slurry, forming, curing and demolding to obtain the conductive concrete.
Comparative example 2
The comparative example provides a high-fluidity conductive concrete which comprises the following raw material components in parts by weight: 80.5 parts of cement, 10 parts of fly ash micro-beads, 10 parts of conductive phase and 0.5 part of water reducing agent; 3 parts of graphite and 7 parts of steel slag in the conductive phase; aggregate: cement 4: 1, the sand rate is 42%; water-cement ratio is 0.45: 1.
the preparation method comprises the following steps:
the method comprises the following steps: putting graphite, steel slag and a water reducing agent into water, and uniformly mixing to form a first mixture;
step two: uniformly mixing other residual raw material components to form a second mixture;
step three: and adding the first mixture into the second mixture, uniformly stirring to form newly-mixed conductive concrete slurry, forming, curing and demolding to obtain the conductive concrete.
Comparative example 3
The comparative example provides a conductive concrete lacking auxiliary materials, which comprises the following raw material components in parts by weight: 90.5 parts of cement, 10 parts of conductive phase and 0.5 part of water reducing agent; 3 parts of graphite and 7 parts of steel slag in the conductive phase; aggregate: cement 4: 1, the sand rate is 42%; water-cement ratio is 0.45: 1.
the preparation method comprises the following steps:
the method comprises the following steps: putting graphite, steel slag and a water reducing agent into water, and uniformly mixing to form a first mixture;
step two: uniformly mixing other residual raw material components to form a second mixture;
step three: and adding the first mixture into the second mixture, uniformly stirring to form newly-mixed conductive concrete slurry, forming, curing and demolding to obtain the conductive concrete.
The high-fluidity conductive concrete prepared in examples 1 to 7 according to the present invention was subjected to performance measurement, and the results of the performance measurement are shown in table 1 below, using the conductive concrete prepared in comparative examples 1 to 3 as a control.
TABLE 1 measurement results of Properties
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains. Unless specifically stated otherwise, the relative steps, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present invention. In all examples shown and described herein, unless otherwise specified, any particular value should be construed as merely illustrative, and not restrictive, and thus other examples of example embodiments may have different values.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention, and all of the technical solutions are covered in the protective scope of the present invention.
Claims (10)
1. The high-fluidity conductive concrete is characterized by comprising the following raw material components in parts by weight: 70-80 parts of cement, 8-15 parts of fly ash microbeads, 10-20 parts of conductive phase, 0-1 part of water reducing agent and 0-0.5 part of surface modifier.
2. The high-fluidity electrically conductive concrete according to claim 1, wherein: the mass ratio of the aggregate to the cementing material in the conductive concrete is (3-5): 1, the sand rate is 40-45%.
3. The high-fluidity electrically conductive concrete according to claim 2, wherein: the mass ratio of the aggregate to the cementing material in the conductive concrete is 4: 1, the sand rate is 42 percent.
4. The high-fluidity electrically conductive concrete according to claim 1, wherein: the water cement ratio of the conductive concrete is (0.35-0.5): 1.
5. the high-fluidity electrically conductive concrete according to claim 1, wherein: the cement is 425 ordinary portland cement.
6. The high-fluidity electrically conductive concrete according to claim 1, wherein: the fly ash micro-bead is an ultra-fine fly ash micro-bead directly collected from a hearth of a coal-fired power plant or obtained by sorting first-grade fly ash.
7. The high-fluidity electrically conductive concrete according to claim 1, wherein: the conductive phase includes, but is not limited to, graphite and steel slag.
8. The high-fluidity electrically conductive concrete according to claim 7, wherein in the electrically conductive phase: 3-5 parts of graphite and 7-15 parts of steel slag.
9. The high-fluidity electrically conductive concrete according to claim 1, wherein: the surface modifier is one or a mixture of dodecyl dimethyl betaine, sodium dodecyl sulfate and sodium dodecyl sulfate.
10. A method for preparing a high-fluidity electrically conductive concrete according to any one of claims 1 to 9, comprising the steps of: putting the conductive phase, the water reducing agent and the surface modifier into water, and uniformly mixing to form a first mixture; uniformly mixing other residual raw material components to form a second mixture; and adding the first mixture into the second mixture, uniformly stirring to form newly-mixed conductive concrete slurry, forming, curing and demolding to obtain the conductive concrete.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113582652A (en) * | 2021-08-13 | 2021-11-02 | 武汉市市政建设集团有限公司 | Conductive quick-hardening repairing material and preparation method thereof |
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Application publication date: 20210723 |