AU2020384570A1 - Intelligent concrete containing multi-scale conductive materials and preparation method therefor - Google Patents
Intelligent concrete containing multi-scale conductive materials and preparation method therefor Download PDFInfo
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- AU2020384570A1 AU2020384570A1 AU2020384570A AU2020384570A AU2020384570A1 AU 2020384570 A1 AU2020384570 A1 AU 2020384570A1 AU 2020384570 A AU2020384570 A AU 2020384570A AU 2020384570 A AU2020384570 A AU 2020384570A AU 2020384570 A1 AU2020384570 A1 AU 2020384570A1
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- Prior art keywords
- graphene
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- cement
- conductive materials
- concrete
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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
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- 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)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
A cement-based intelligent concrete material containing three conductive materials, such as graphene, carbon black and steel fiber. A preparation method for the cement-based intelligent concrete material comprises the following steps: dissolving a dispersant in water, then adding graphene, and placing the container in an ultrasonic generator to disperse the graphene to obtain a uniform graphene suspension; mixing cement and carbon black with a powder pneumatic mixer; stirring steel fiber, sand and coarse aggregate in a concrete mixer to mix the same uniformly, and adding the mixed cement and carbon black during the stirring process; and adding the graphene suspension, and uniformly stirring to obtain a mixed intelligent concrete. Electrodes are placed in a part to be detected of a structural member, and then the mixed graphene concrete is poured into the predetermined part. By detecting the change of resistivity between the electrodes, the changes of stress and damage of the concrete structural member is characterized, thereby achieving the purpose of real-time detection of stress and damage state of the concrete structure.
Description
[0001] The present disclosure relates to the field of building materials, and in particular to an intelligent concrete containing multi-scale conductive materials and a preparation method thereof.
[0002] The study of intelligent concrete may be traced back to 1960s. To form an intelligent concrete with a self-sensing function, it is often required to add conductive materials into the concrete, for example, carbon and metal, including carbon fiber, carbon black, metal powder and metal fiber and the like. An electrical resistivity of the concrete changes along with a change of a pressure received by the concrete. Generally, with an increasing doping amount of a conductive filler, the electrical resistivity of the intelligent material decreases gradually. With the increase of pressure action, the electrical resistivity along the pressure direction decreases gradually; under a pulling action, the electrical resistivity along the pulling force direction increases gradually. When cracks appear, the electrical resistivity tends to increase dramatically. Graphene is of a two-dimensional honeycombed crystal structure with carbon atoms arranged in a single layer, that is, graphene may be understood as graphite of monoatomic layer in terms of a molecular structure. In the known materials, graphene has the !0 smallest thickness which is of only one carbon atom, but it has a very high strength, and also has the best conductivity in the known materials at present. Therefore, graphene applied to a cement-based composite material can better realize strengthening and toughening functions, and better realize a function as an embedded detection sensing element. However, graphene is high in cost and may cause a mechanical property of concrete to decline in a case of an excessive doping amount. If conductive materials of different scales (nanometer, micrometer and millimeter) are adopted, the doping amount of graphene can be substantially reduced, the cost of the intelligent concrete can be reduced, and sensitivity of intelligent characteristics can be improved at the same time. Meanwhile, doping of fiber materials can also improve the mechanical property of the intelligent concrete.
[0003] In view of the above excellent electrical property of graphene and composition with conductive materials of other scales, the present disclosure provides an intelligent concrete
I containing multi-scale conductive materials and a preparation method thereof. The intelligent concrete is composed of raw materials such as cement, sand, coarse aggregate, water, graphene, dispersant, carbon black and steel fiber. Graphene has strengthening and toughening functions for the concrete, and enables the concrete to have a pressure-sensitive performance. When an electrode is properly placed in the concrete, the purpose of detecting a force and a damage to a structural member may be achieved by detecting a change of electrical resistivity of the intelligent concrete. The use of the intelligent concrete as a sensor has the following advantages: the doped graphene has the strengthening and toughening functions for the concrete; the sensor as concrete may combines well with a structural concrete, thereby reducing measurement errors caused by material differences.
[0004] To solve the technical problem, the present disclosure adopts the following technical solution.
[0005] A graphene cement-based intelligent concrete material and a preparation method thereof are provided. The intelligent concrete is composed of the components with the following weight parts: 300-450 parts of cement, 600-1350 parts of sand, 0-1600 parts of coarse aggregate, 150-350 parts of water, 9-60 parts of graphene, 9-60 parts of dispersant, 15-90 parts of carbon black and 40-120 parts of steel fiber.
[0006] Preferably, the cement is ordinary Portland cement or Portland cement rated at 32.5, 42.5 or 52.5. !0 [0007] Preferably, the graphene is raw few-layered graphene powder with a sheet thickness less than 1 nm and a plane size less than 1 m.
[0008] Preferably, the dispersant is a naphthalene series water reducer or polycarboxylate water reducer.
[0009] Preferably, a particle size of the carbon black is not more than 75 [m.
[0010] Preferably, the steel fiber is not more than 0.1-0.2 mm in diameter and is 10-15 mm in length.
[0011] At the same time, the present disclosure further provides a method of preparing the intelligent concrete containing multi-scale conductive materials. The method includes the following steps.
[0012] At step 1, the dispersant is dissolved in the water and then the graphene is added, and the container is placed in an ultrasonic generator to disperse and dissolve the graphene, so as to obtain a uniform graphene suspension.
[0013] At step 2, cement and carbon black are mixed up in a powder pneumatic mixer.
[0014] At step 3, steel fiber, sandand coarse aggregate are mixed up to uniformity in a concrete mixer, and the mixture of cement and carbon black is added during stirring.
[0015] At step 4, the graphene suspension is added into the uniformly stirred dry material, and then stirred to uniformity.
[0016] At step 5, an electrode is firstly placed in a to-be-detected position of a structural member, and then the mixed graphene concrete is poured into the predetermined position, and then change of force and damage of the structural member is detected by detecting a change of electrical resistivity between electrodes.
[0017] An inherent defect of the cement-based material is poor crack resistance, and tiny cracks and local damages may also occur under the action of normal use load and surrounding environments. Graphene can not only improve a mechanical strength of the cement-based composite material to improve fracture toughness, but also serve as a conductive functional component of the cement-based material to produce an excellent pressure-sensitive effect. Thus, the material graphene may be used for large structures or some critical positions so that it can be used as a sensor to detect force characteristics and health conditions of buildings and structures in real time and achieve the strengthening and toughening function at the same time, thereby providing a novel approach for building intelligentization.
[0018] Descriptions are further made below in combination with accompanying drawings and specific examples.
[0019] FIG. 1 is a curve chart of change of an electrical resistivity of an intelligent concrete containing multi-scale conductive materials along with a pressure according to a first embodiment of the present disclosure.
[0020] FIG. 2 is a curve chart of change of an electrical resistivity of an intelligent concrete containing multi-scale conductive materials along with a pressure according to a second embodiment of the present disclosure.
[0021] FIG. 3 is a curve chart of change of an electrical resistivity of an intelligent concrete containing multi-scale conductive materials along with a pressure according to a third embodiment of the present disclosure.
[0022] FIG. 4 is a curve chart of change of an electrical resistivity of an intelligent concrete containing multi-scale conductive materials along with a pressure according to a fourth embodiment of the present disclosure.
[0023] FIG. 5 is a curve chart of change of an electrical resistivity of an intelligent concrete containing multi-scale conductive materials along with a pressure according to a fifth embodiment of the present disclosure.
[0024] FIG. 6 is a curve chart of change of an electrical resistivity of an intelligent concrete containing multi-scale conductive materials along with a pressure according to a sixth embodiment of the present disclosure.
[0025] Example 1
[0026] An intelligent concrete containing multi-scale conductive materials is composed of components with the following weight parts: 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 dispersant, 60 parts of carbon black and 120 parts of steel fiber.
[0027] The prepared graphene concrete has a compressive strength of 35.4 MPa, and is applied with a cyclic pressure of 1-10 MPa to measure a change trend of its electrical resistivity along with the pressure as shown in FIG. 1.
[0028] Example 2
[0029] An intelligent concrete material containing multi-scale conductive materials is composed of components with following weight parts: 300 parts of cement, 1350 parts of sand, 0 parts of coarse aggregate, 270 parts of water, 28.8 parts of graphene, 20 parts of dispersant, 90 parts of carbon black and 40 parts of steel fiber.
[0030] The prepared graphene concrete has a compressive strength of 34.9 MPa, and is applied with a cyclic pressure of 1-10 MPa to measure a change trend of its electrical resistivity along with the pressure as shown in FIG. 2.
[0031] Example 3
[0032] An intelligent concrete material containing multi-scale conductive materials is composed of components with the following weight parts: 450 parts of cement, 600 parts of sand, 1200 parts of coarse aggregate, 300 parts of water, 60 parts of graphene, 30 parts of dispersant, 60 parts of carbon black and 40 parts of steel fiber.
[0033] The prepared graphene concrete has a compressive strength of 30.4 MPa, and is applied with a cyclic pressure of 1-10 MPa to measure a change trend of its electrical resistivity along with the pressure as shown in FIG. 3.
[0034] Example 4
[0035] An intelligent concrete material containing multi-scale conductive materials is composed of components with the following weight parts: 450 parts of cement, 600 parts of sand, 600 parts of coarse aggregate, 300 parts of water, 9 parts of graphene, 9 parts of dispersant, 60 parts of carbon black and 40 parts of steel fiber.
[0036] The prepared graphene concrete has a compressive strength of 38.4 MPa, and is applied with a cyclic pressure of 1-10 MPa to measure a change trend of its electrical resistivity along with the pressure as shown in FIG. 4.
[0037] Example 5
[0038] An intelligent concrete material containing multi-scale conductive materials is composed of components with the following weight parts: 450 parts of cement, 600 parts of sand, 1200 parts of coarse aggregate, 300 parts of water, 30 parts of graphene, 30 parts of dispersant, 60 parts of carbon black and 120 parts of steel fiber.
[0039] The prepared graphene concrete has a compressive strength of 31.3 MPa, and is applied with a cyclic pressure of 1-10 MPa to measure a change trend of its electrical resistivity along with the pressure as shown in FIG. 5.
[0040] Example 6
[0041] An intelligent concrete material containing multi-scale conductive materials is composed of components with the following weight parts: 300 parts of cement, 600 parts of sand, 0 parts of coarse aggregate, 150 parts of water, 30 parts of graphene, 30 parts of dispersant, 60 parts of carbon black and 40 parts of steel fiber.
[0042] The prepared graphene concrete has a compressive strength of 25.6 MPa, and is applied with a cyclic pressure of 1-10 MPa to measure a change trend of its electrical resistivity along with the pressure as shown in FIG. 6.
[0043] The present disclosure provides a cement-based intelligent concrete material containing conductive materials of three scales graphene, carbon black and steel fiber (three materials are in the scales of nanometer, micrometer and millimeter respectively). The intelligent concrete is composed of the following components: cement, sand, coarse aggregate, water, graphene, carbon black, steel fiber and dispersant. A preparation method thereof includes the following steps: dissolving the dispersant in the water and then adding graphene, and placing the container in an ultrasonic generator to disperse and dissolve the graphene, so as to obtain a uniform graphene suspension; mixing up cement and carbon black in a powder pneumatic mixer; then, mixing up steel fiber, sand and coarse aggregate to uniformity in a concrete mixer, and adding the mixture of cement and carbon black during stirring; and finally, adding the graphene suspension and uniformly stirring to obtain a well-mixed intelligent concrete. An electrode is firstly placed in a to-be-detected position of a structural member, and then the well-mixed graphene concrete is poured into the predetermined position so that change of force and damage to the concrete structural member is detected by detecting a change of electrical resistivity between electrodes, thereby achieving the purpose of detecting the state of the force and damage to the concrete structure in real time.
[0044] Finally, it is to be noted that the foregoing descriptions are merely preferred examples of the present disclosure, and are not intended to limit the present disclosure. Although the present disclosure is described in detail by referring to the above examples, persons skilled in the art may still modify the technical solution of each example described above or make equivalent substitutions for a part of technical features in the above examples. Any modifications, equivalent substitutions, improvements, and the like made within the spirit and principles of the present disclosure shall be included in the scope of protection of the present disclosure.
Claims (7)
1. An intelligent concrete containing multi-scale conductive materials, comprising components with the following weight parts: 300-450 parts of cement, 600-1350 parts of sand, 0-1600 parts of coarse aggregate, 150-350 parts of water, 9-60 parts of graphene, 9-60 parts of dispersant, 15-90 parts of carbon black and 40-120 parts of steel fiber.
2. The intelligent concrete containing multi-scale conductive materials according to claim 1, wherein the cement is ordinary Portland cement or Portland cement rated at 32.5, 42.5 or 52.5.
3. The intelligent concrete containing multi-scale conductive materials according to claim 1, wherein the graphene is raw few-layered graphene powder with a sheet thickness less than 1 nm and a size less than 1 m.
4. The intelligent concrete containing multi-scale conductive materials according to claim 1, wherein the dispersant is a naphthalene series water reducer or polycarboxylate water reducer.
5. The intelligent concrete containing multi-scale conductive materials according to claim 1, wherein a particle size of the carbon black is not more than 75 m.
6. The intelligent concrete containing multi-scale conductive materials according to claim 1, wherein the steel fiber is 0.1-0.2 mm in diameter and 10-15 mm in length.
7. A method of preparing the intelligent concrete containing multi-scale conductive materials, comprising the following steps:
at step 1, dissolving the dispersant in the water and then adding graphene, and placing the container in an ultrasonic generator to disperse and dissolve the graphene, so as to obtain a uniform graphene suspension;
at step 2, mixing up cement and carbon black in a powder pneumatic mixer;
at step 3, mixing up steel fiber, sand and coarse aggregate to uniformity in a concrete mixer, and adding the mixture of cement and carbon black during stirring;
at step 4, adding the graphene suspension into the uniformly stirred dry material, and then stirring to uniformity; and
at step 5, firstly placing an electrode in a to-be-detected position of a structural member, and then pouring the well-mixed graphene concrete into the predetermined position so that '0 change of force and damage to the structural member is detected by detecting a change of electrical resistivity between electrodes.
Applications Claiming Priority (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 |
| CN201911110448.8 | 2019-11-14 | ||
| PCT/CN2020/115194 WO2021093445A1 (en) | 2019-11-14 | 2020-09-15 | Intelligent concrete containing multi-scale conductive materials and preparation method therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2020384570A1 true AU2020384570A1 (en) | 2021-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| AU2020384570A Abandoned AU2020384570A1 (en) | 2019-11-14 | 2020-09-15 | Intelligent concrete containing multi-scale conductive materials and preparation method therefor |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN110963758A (en) |
| AU (1) | AU2020384570A1 (en) |
| WO (1) | WO2021093445A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023209469A1 (en) * | 2022-04-25 | 2023-11-02 | Voltocrete Innovation Kft. | Cement-based electric surface heating structure and method of manufacturing the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110963758A (en) * | 2019-11-14 | 2020-04-07 | 国家电网有限公司 | Intelligent concrete containing multi-scale conductive 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 |
| CN111925171A (en) * | 2020-08-14 | 2020-11-13 | 东南大学 | High-ductility self-recovery cement-based material and preparation method thereof |
| CN113860816B (en) * | 2021-09-27 | 2023-03-28 | 同济大学 | Chargeable, electricity-storage and discharge concrete material and preparation method thereof |
| CN113998959B (en) * | 2021-12-07 | 2022-04-22 | 哈尔滨工业大学 | Structure and perception function integrated intelligent grouting material for steel bar sleeve |
| IT202200002330A1 (en) | 2022-02-09 | 2023-08-09 | Italcementi Spa | Use of an electrically conductive binder for monitoring the deformation and cracking state of concrete structures |
| CN114455874B (en) * | 2022-02-16 | 2022-10-25 | 哈尔滨工业大学 | Preparation method and application of conductive aggregate |
| CN115057672B (en) * | 2022-04-15 | 2023-08-15 | 重庆大学溧阳智慧城市研究院 | 3D printing conductive concrete based on nano graphite-nano SiO 2-copper slag |
| CN114988785A (en) * | 2022-05-31 | 2022-09-02 | 深圳大学 | Nano-fluid modified organic fiber reinforced concrete and optimization design method |
| CN115231860B (en) * | 2022-06-22 | 2023-07-04 | 桂林理工大学 | Cement-based material of modified graphene and preparation method thereof |
| CN115385621A (en) * | 2022-07-11 | 2022-11-25 | 长安大学 | Self-induction conductive cement composite material and preparation method thereof |
| CN115448657A (en) * | 2022-08-23 | 2022-12-09 | 绍兴职业技术学院 | Pervious concrete containing porous hybrid fiber modified recycled aggregate and preparation method thereof |
| CN116239353B (en) * | 2023-02-24 | 2024-06-25 | 湖北工业大学 | Self-sensing high-strength connecting material for assembly engineering and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100494114C (en) * | 2006-04-20 | 2009-06-03 | 武汉理工大学 | Electro-conductive concrete with nano charcoal black |
| CN103420647B (en) * | 2013-07-25 | 2015-02-04 | 南京航空航天大学 | Conductive material co-doping conductive concrete and preparation method thereof |
| WO2016178981A1 (en) * | 2015-05-01 | 2016-11-10 | The University Of Massachusetts | Distributed fiber sensor |
| CN105801047A (en) * | 2016-02-18 | 2016-07-27 | 上海市建筑科学研究院 | Graphene cement-based intelligent concrete material and preparation method thereof |
| CN106116362A (en) * | 2016-06-28 | 2016-11-16 | 西京学院 | A kind of carbon fiber composite graphite alkene strengthens the preparation method of regeneration concrete |
| CN106431154A (en) * | 2016-08-31 | 2017-02-22 | 浙江大学自贡创新中心 | Cement-based self-leveling antistatic terrace material |
| CN106495607B (en) * | 2016-10-31 | 2019-04-09 | 中国葛洲坝集团电力有限责任公司 | A kind of conducting concrete and preparation method thereof and application |
| CN108275948B (en) * | 2018-03-07 | 2020-09-11 | 广州大学 | Conductive steel tube concrete and preparation method thereof |
| US20190292382A1 (en) * | 2018-03-26 | 2019-09-26 | Chemical Dynamics Llc | Formulations for electrostatic spray on nonconductive substrates |
| CN110963758A (en) * | 2019-11-14 | 2020-04-07 | 国家电网有限公司 | Intelligent concrete containing multi-scale conductive material and preparation method thereof |
-
2019
- 2019-11-14 CN CN201911110448.8A patent/CN110963758A/en active Pending
-
2020
- 2020-09-15 WO PCT/CN2020/115194 patent/WO2021093445A1/en active Application Filing
- 2020-09-15 AU AU2020384570A patent/AU2020384570A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023209469A1 (en) * | 2022-04-25 | 2023-11-02 | Voltocrete Innovation Kft. | Cement-based electric surface heating structure and method of manufacturing the same |
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| Publication number | Publication date |
|---|---|
| CN110963758A (en) | 2020-04-07 |
| WO2021093445A1 (en) | 2021-05-20 |
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