CN110963758A - Intelligent concrete containing multi-scale conductive material and preparation method thereof - Google Patents
Intelligent concrete containing multi-scale conductive material and preparation method thereof Download PDFInfo
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- CN110963758A CN110963758A CN201911110448.8A CN201911110448A CN110963758A CN 110963758 A CN110963758 A CN 110963758A CN 201911110448 A CN201911110448 A CN 201911110448A CN 110963758 A CN110963758 A CN 110963758A
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- graphene
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- cement
- concrete
- conductive material
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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
- C04B2111/90—Electrical properties
- C04B2111/94—Electrically conducting materials
Abstract
The invention discloses a cement-based intelligent concrete material containing conductive materials with three scales of graphene, carbon black and steel fiber, and a preparation method of the cement-based intelligent concrete material comprises the following steps: dissolving a dispersing agent in water, adding graphene, placing the container in an ultrasonic generator to break up the graphene, and obtaining a uniform graphene suspension; mixing cement and carbon black by using a powder pneumatic mixer; mixing the steel fiber, the sand and the coarse aggregate in a concrete mixer until the mixture is uniform, and adding the mixed cement and carbon black in the mixing process; adding the graphene turbid liquid, and stirring uniformly to obtain the well-mixed intelligent concrete. The method comprises the steps of placing electrodes at parts of a structural member to be detected, pouring mixed graphene concrete into a preset part, and detecting the change of the resistivity between the electrodes to represent the change of the stress condition and the damage condition of the structural member, so that the aim of detecting the stress and damage state of the concrete structure in real time is fulfilled.
Description
Technical Field
The invention relates to the field of building materials, in particular to intelligent concrete containing a multi-scale conductive material and a preparation method thereof.
Background
The research of intelligent concrete dates back to 60 years in the last century, and conductive materials such as carbon, metal and the like including carbon fibers, carbon black, metal powder, metal fibers and the like are often required to be added into concrete to form the intelligent concrete with a self-sensing function, wherein the resistivity of the concrete changes along with the change of pressure borne by the concrete. In general, the resistivity of the smart material gradually decreases as the amount of the conductive filler is added. The resistivity along the pressure action direction is gradually reduced along with the increase of the pressure action, the resistivity along the tension action direction is gradually increased under the tension action, and when cracks appear, the resistivity has a tendency of suddenly increasing. Graphene is a two-dimensional honeycomb lattice structure with a monolayer arrangement of carbon atoms, i.e. it is understood to be a monolayer of graphite in terms of molecular structure, and graphene is the thinnest of known materials, has a thickness of only one carbon atom, yet has very high strength, and is also the best conductive in currently known materials. Therefore, the graphene is applied to the cement-based composite material, so that the functions of strengthening and toughening can be better realized, and the function of serving as an embedded monitoring sensing element can be better realized. However, the graphene is high in cost, and the mechanical property of the concrete is reduced when the graphene is excessively added. If the conductive material containing different scales (nanometer, micrometer and millimeter) is adopted, the doping amount of graphene can be greatly reduced, the manufacturing cost of intelligent concrete is reduced, the intelligent characteristic sensitivity is improved, and meanwhile, the mechanical property of the intelligent concrete can be improved by doping the fiber material.
Disclosure of Invention
In view of the excellent electrical properties of the graphene and the composite effect of the graphene and other conductive materials, the invention provides intelligent concrete containing a multi-scale conductive material and a preparation method thereof. The intelligent concrete is composed of raw materials such as cement, sand, coarse aggregate, water, graphene, a dispersing agent, carbon black, steel fiber and the like, wherein the graphene has a reinforcing and toughening function on concrete, and enables the concrete to have pressure-sensitive performance, and electrodes are properly arranged, so that the purpose of detecting the stress and damage conditions of a structural member can be achieved by detecting the change of the resistivity of the intelligent concrete. The intelligent concrete used as the sensor has the following advantages: the doping of the graphene has the function of enhancing and toughening concrete; the sensor is also made of concrete, and can be well combined with structural concrete, so that the measurement error caused by material difference is reduced.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the graphene cement-based intelligent concrete material is characterized by comprising the following components in parts by weight: 450 parts of cement, 600 parts of sand, 1350 parts of coarse aggregate, 350 parts of water, 9-60 parts of graphene, 9-60 parts of a dispersing agent, 15-90 parts of carbon black and 40-120 parts of steel fiber.
Preferably, the cement is ordinary portland cement or portland cement, and the grade of the cement is 32.5, 42.5 or 52.5.
Preferably, the graphene is undisturbed few-layer graphene powder, the thickness of a graphene sheet layer is less than 1nm, and the plane size is less than 1 μm.
Preferably, the dispersant is a naphthalene water reducer or a polycarboxylic acid water reducer.
Preferably, the carbon black particles have a size not exceeding 75 μm.
Preferably, the diameter of the steel fiber is not more than 0.1-0.2mm, and the length is 10-15 mm.
Meanwhile, the invention also provides a preparation method of the intelligent concrete containing the multi-scale conductive material, which comprises the following steps:
1) dissolving a dispersing agent in water, adding graphene, and placing the container in an ultrasonic generator to break up and dissolve the graphene to obtain a uniform graphene suspension;
2) mixing cement and carbon black by using a powder pneumatic mixer;
3) then, mixing the steel fiber, the sand and the coarse aggregate in a concrete mixer until the mixture is uniform, and adding the mixed cement and carbon black in the mixing process;
4) adding the graphene turbid liquid into the uniformly stirred dry material, and then stirring until the mixture is uniform;
5) the method comprises the steps of placing an electrode in a part of a structural member to be detected, pouring mixed graphene concrete into a preset part, and detecting the change of the resistivity between the electrodes to achieve the purpose of detecting the change of the stress condition and the damaged condition of the structure.
Has the advantages that:
the inherent defects of the cement-based material are that the crack resistance is poor, and fine cracking and local damage can be generated under the action of normal use load and peripheral environment. The graphene can improve the mechanical strength and the fracture toughness of the cement-based composite material, and can also serve as a conductive functional component of the cement-based material to generate an excellent pressure-sensitive effect. The material is used for large structures or certain key parts, can be used as a sensor to monitor the stress characteristics and the health condition of a building in real time, also plays a role in enhancing and toughening, achieves two purposes at one stroke, and provides a novel means for building intellectualization.
Drawings
The following further description is made with reference to the accompanying drawings and detailed description:
fig. 1 is a graph of resistivity versus pressure for smart concrete containing multi-scale conductive material of example 1 of the present invention.
Fig. 2 is a graph of resistivity versus pressure for smart concrete containing multi-scale conductive material of example 2 of the present invention.
Fig. 3 is a graph of resistivity versus pressure for smart concrete containing multi-scale conductive material of example 3 of the present invention.
Fig. 4 is a graph of resistivity versus pressure for smart concrete containing multi-scale conductive material of example 4 of the present invention.
Fig. 5 is a graph of resistivity versus pressure for smart concrete containing multi-scale conductive material of example 5 of the present invention.
Fig. 6 is a graph of resistivity versus pressure for smart concrete containing multi-scale conductive material of example 6 of the present invention.
Detailed Description
Example 1
The intelligent concrete containing the multi-scale conductive material comprises the following components in parts by weight: 450 parts of cement, 1350 parts of sand, 1600 parts of coarse aggregate, 350 parts of water, 14.4 parts of graphene, 14.4 parts of a dispersing agent, 60 parts of carbon black and 120 parts of steel fiber.
The compressive strength of the prepared graphene concrete is 35.4MPa, 1-10MPa of circulating pressure is applied to the graphene concrete, and the trend of the resistivity changing along with the pressure is shown in figure 1.
Example 2
The intelligent concrete containing the multi-scale conductive material comprises the following components in parts by weight: 300 parts of cement, 1350 parts of sand, 0 part of coarse aggregate, 270 parts of water, 28.8 parts of graphene, 20 parts of a dispersing agent, 90 parts of carbon black and 40 parts of steel fiber.
The compressive strength of the prepared graphene concrete is 34.9Mpa, the graphene concrete is applied with 1-10Mpa of circulating pressure, and the trend of the resistivity along with the change of the pressure is measured and shown in figure 2.
Example 3
The intelligent concrete containing the multi-scale conductive material comprises the following components in parts by weight: 450 parts of cement, 600 parts of sand, 1200 parts of coarse aggregate, 300 parts of water, 60 parts of graphene, 30 parts of a dispersing agent, 60 parts of carbon black and 40 parts of steel fiber.
The compressive strength of the prepared graphene concrete is 30.4Mpa, the graphene concrete is applied with 1-10Mpa of circulating pressure, and the trend of the resistivity along with the change of the pressure is measured and shown in figure 3.
Example 4
The intelligent concrete containing the multi-scale conductive material comprises the following components in parts by weight: 450 parts of cement, 600 parts of sand, 600 parts of coarse aggregate, 300 parts of water, 9 parts of graphene, 9 parts of a dispersing agent, 60 parts of carbon black and 40 parts of steel fiber.
The compressive strength of the prepared graphene concrete is 38.4Mpa, the graphene concrete is applied with 1-10Mpa of circulating pressure, and the trend of the resistivity along with the change of the pressure is shown in figure 4.
Example 5
The intelligent concrete containing the multi-scale conductive material comprises the following components in parts by weight: 450 parts of cement, 600 parts of sand, 1200 parts of coarse aggregate, 300 parts of water, 30 parts of graphene, 30 parts of a dispersing agent, 60 parts of carbon black and 120 parts of steel fiber.
The compressive strength of the prepared graphene concrete is 31.3Mpa, the graphene concrete is applied with 1-10Mpa of circulating pressure, and the trend of the resistivity along with the change of the pressure is measured and shown in figure 5.
Example 6
The intelligent concrete containing the multi-scale conductive material comprises the following components in parts by weight: 300 parts of cement, 600 parts of sand, 0 part of coarse aggregate, 150 parts of water, 30 parts of graphene, 30 parts of a dispersing agent, 60 parts of carbon black and 40 parts of steel fiber.
The compressive strength of the prepared graphene concrete is 25.6Mpa, the circulating pressure of 1-10Mpa is applied to the graphene concrete, and the trend of the resistivity changing along with the pressure is shown in figure 6.
The invention discloses a cement-based intelligent concrete material containing conductive materials with three dimensions of graphene, carbon black and steel fiber (the three materials are respectively nano-sized, micro-sized and millimeter-sized), which consists of the following components: cement, sand, coarse aggregate, water, graphene, carbon black, steel fiber and a dispersing agent. The preparation method comprises the following steps: dissolving a dispersing agent in water, adding graphene, placing the container in an ultrasonic generator to break up the graphene to obtain a uniform graphene suspension; mixing cement and carbon black by using a powder pneumatic mixer; then, mixing the steel fiber, the sand and the coarse aggregate in a concrete mixer until the mixture is uniform, and adding the mixed cement and carbon black in the mixing process; and finally, adding the graphene turbid liquid, and uniformly stirring to obtain the well-mixed intelligent concrete. The method comprises the steps of placing electrodes at parts of a structural member to be detected, pouring mixed graphene concrete into a preset part, and detecting the change of the resistivity between the electrodes to represent the change of the stress condition and the damage condition of the structural member, so that the aim of detecting the stress and damage state of the concrete structure in real time is fulfilled.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The intelligent concrete containing the multi-scale conductive material is characterized in that: the composition comprises the following components in parts by weight: 450 parts of cement, 600 parts of sand, 1350 parts of coarse aggregate, 350 parts of water, 9-60 parts of graphene, 9-60 parts of a dispersing agent, 15-90 parts of carbon black and 40-120 parts of steel fiber.
2. The intelligent concrete containing the multi-scale conductive material according to claim 1, wherein the cement is ordinary portland cement or portland cement, and the grade is 32.5, 42.5 or 52.5.
3. The intelligent concrete containing the multi-scale conductive material according to claim 1, wherein the graphene is undisturbed few-layer graphene powder, the thickness of a graphene sheet layer is less than 1nm, and the size of the graphene sheet layer is less than 1 μm.
4. The intelligent concrete containing the multi-scale conductive material as claimed in claim 1, wherein the dispersant is a naphthalene water reducer or a polycarboxylic acid water reducer.
5. A smart concrete containing multi-scale conductive materials as claimed in claim 1, wherein the carbon black particle size is not more than 75 μm.
6. The intelligent concrete containing the multi-scale conductive material according to claim 1, wherein the diameter of the steel fiber is 0.1-0.2mm, and the length of the steel fiber is 10-15 mm.
7. The preparation method of the intelligent concrete containing the multi-scale conductive material is characterized by comprising the following steps:
1) dissolving a dispersing agent in water, adding graphene, and placing the container in an ultrasonic generator to break up and dissolve the graphene to obtain a uniform graphene suspension;
2) mixing cement and carbon black by using a powder pneumatic mixer;
3) then, mixing the steel fiber, the sand and the coarse aggregate in a concrete mixer until the mixture is uniform, and adding the mixed cement and carbon black in the mixing process;
4) adding the graphene turbid liquid into the uniformly stirred dry material, and then stirring until the mixture is uniform;
5) the method comprises the steps of placing an electrode in a part of a structural member to be detected, pouring mixed graphene concrete into a preset part, and detecting the change of the resistivity between the electrodes to achieve the purpose of detecting the change of the stress condition and the damaged condition of the structure.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911110448.8A CN110963758A (en) | 2019-11-14 | 2019-11-14 | Intelligent concrete containing multi-scale conductive material and preparation method thereof |
| PCT/CN2020/115194 WO2021093445A1 (en) | 2019-11-14 | 2020-09-15 | Intelligent concrete containing multi-scale conductive materials and preparation method therefor |
| AU2020384570A AU2020384570A1 (en) | 2019-11-14 | 2020-09-15 | Intelligent concrete containing multi-scale conductive materials and preparation method therefor |
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| CN201911110448.8A CN110963758A (en) | 2019-11-14 | 2019-11-14 | Intelligent concrete containing multi-scale conductive material and preparation method thereof |
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| AU (1) | AU2020384570A1 (en) |
| WO (1) | WO2021093445A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111925171A (en) * | 2020-08-14 | 2020-11-13 | 东南大学 | High-ductility self-recovery cement-based material and preparation method thereof |
| CN111943594A (en) * | 2020-08-14 | 2020-11-17 | 东南大学 | High-ductility self-recovery cement-based combined column |
| WO2021093445A1 (en) * | 2019-11-14 | 2021-05-20 | 国家电网有限公司 | Intelligent concrete containing multi-scale conductive materials and preparation method therefor |
| CN113860816A (en) * | 2021-09-27 | 2021-12-31 | 同济大学 | Chargeable, electricity-storage and discharge concrete material and preparation method thereof |
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| CN116239353A (en) * | 2023-02-24 | 2023-06-09 | 湖北工业大学 | Self-sensing high-strength connecting material for assembly engineering and preparation method thereof |
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| WO2021093445A1 (en) * | 2019-11-14 | 2021-05-20 | 国家电网有限公司 | Intelligent concrete containing multi-scale conductive materials and preparation method therefor |
| CN111925171A (en) * | 2020-08-14 | 2020-11-13 | 东南大学 | High-ductility self-recovery cement-based material and preparation method thereof |
| CN111943594A (en) * | 2020-08-14 | 2020-11-17 | 东南大学 | High-ductility self-recovery cement-based combined column |
| CN113860816A (en) * | 2021-09-27 | 2021-12-31 | 同济大学 | Chargeable, electricity-storage and discharge concrete material and preparation method thereof |
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| Publication number | Publication date |
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| WO2021093445A1 (en) | 2021-05-20 |
| AU2020384570A1 (en) | 2021-06-17 |
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Application publication date: 20200407 |