WO2021093445A1 - 一种含多尺度导电材料的智能混凝土及其制备方法 - Google Patents
一种含多尺度导电材料的智能混凝土及其制备方法 Download PDFInfo
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- WO2021093445A1 WO2021093445A1 PCT/CN2020/115194 CN2020115194W WO2021093445A1 WO 2021093445 A1 WO2021093445 A1 WO 2021093445A1 CN 2020115194 W CN2020115194 W CN 2020115194W WO 2021093445 A1 WO2021093445 A1 WO 2021093445A1
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- graphene
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- cement
- conductive materials
- concrete
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—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
Definitions
- the invention relates to the field of building materials, in particular to a smart concrete containing multi-scale conductive materials and a preparation method thereof.
- Graphene is a two-dimensional honeycomb lattice structure in which carbon atoms are arranged in a single layer, that is, it can be understood as a single-layer graphite in terms of molecular structure.
- Graphene is the thinnest among the known materials, with the thickness of only one carbon atom. It has very high strength, and it is also the best conductive property among the currently known materials. Therefore, the application of graphene to cement-based composite materials will better realize the function of strengthening and toughening, and better realize the function as an embedded monitoring sensor element.
- the cost of graphene is high, and excessive mixing will result in a decrease in the mechanical properties of concrete.
- the present invention provides a smart concrete containing multi-scale conductive materials and a preparation method thereof. It is composed of cement, sand, coarse aggregate, water, graphene, dispersant, carbon black, steel fiber and other raw materials.
- Graphene has the function of strengthening and toughening concrete, and makes the concrete pressure-sensitive. It is appropriate to insert electrodes, That is, by detecting the change of the electrical resistivity of the smart concrete, the purpose of detecting the force and damage of the structural member can be achieved.
- Using the smart concrete as a sensor has the following advantages: the incorporation of graphene has the function of strengthening and toughening the concrete; the sensor is also concrete, which can be well combined with structural concrete, reducing measurement errors caused by material differences.
- a graphene cement-based smart concrete material and a preparation method thereof characterized in that it is composed of the following components by weight: 300-450 parts of cement, 600-1350 parts of sand, 0-1600 parts of coarse aggregate, 150 parts of water -350 parts, 9-60 parts of graphene, 9-60 parts of dispersant, 15-90 parts of carbon black, 40-120 parts of steel fiber.
- the cement is ordinary Portland cement or Portland cement, with a grade of 32.5, 42.5 or 52.5.
- the graphene uses undisturbed oligo-layer graphene powder, the thickness of the graphene sheet is ⁇ 1 nm, and the plane size is ⁇ 1 ⁇ m.
- the dispersant is a naphthalene-based water-reducing agent or a polycarboxylic acid water-reducing agent.
- the carbon black particle size does not exceed 75 ⁇ m.
- the diameter of the steel fiber does not exceed 0.1-0.2mm and the length is 10-15mm.
- the present invention also provides a preparation method of the smart concrete containing multi-scale conductive materials, which includes the following steps:
- the inherent defect of cement-based materials is poor anti-cracking performance, and micro-cracking and local damage will also occur under normal use loads and the external environment.
- Graphene can not only improve the mechanical strength and fracture toughness of cement-based composite materials, but also act as a conductive functional component of cement-based materials and produce excellent pressure-sensitive effects.
- the material used in large structures or certain key parts can not only be used as sensors to monitor the force characteristics and health conditions of buildings in real time, but also play a role in strengthening and toughening. It can do two things with one stone and provide a novel method for building intelligence. .
- Fig. 1 is a graph showing the change in resistivity of smart concrete containing multi-scale conductive materials as a function of pressure in Example 1 of the present invention.
- Fig. 2 is a graph showing the change in resistivity of smart concrete containing multi-scale conductive materials with pressure according to Example 2 of the present invention.
- Fig. 3 is a graph showing the change in resistivity of smart concrete containing multi-scale conductive materials with pressure according to Example 3 of the present invention.
- Fig. 4 is a graph showing the change in resistivity of smart concrete containing multi-scale conductive materials with pressure according to Example 4 of the present invention.
- Fig. 5 is a graph showing the change in resistivity of smart concrete containing multi-scale conductive materials with pressure according to Example 5 of the present invention.
- Fig. 6 is a graph showing the change in resistivity of smart concrete containing multi-scale conductive materials with pressure according to Example 6 of the present invention.
- a smart concrete containing multi-scale conductive materials consisting of the following components 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 dispersant, and carbon black 60 parts, 120 parts of steel fiber.
- the obtained graphene concrete has a compressive strength of 35.4 MPa, and a cyclic pressure of 1 to 10 MPa is applied to it, and the trend of its resistivity with pressure is shown in Figure 1.
- a smart concrete containing multi-scale conductive materials consisting of the following components by weight: 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, and carbon black 90 parts, 40 parts steel fiber.
- the obtained graphene concrete has a compressive strength of 34.9Mpa, and a cyclic pressure of 1-10Mpa is applied to it, and the trend of its resistivity changing with pressure is measured as shown in Figure 2.
- a smart concrete containing multi-scale conductive materials consisting of the following components 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 dispersant, and carbon black 60 parts, 40 parts steel fiber.
- the obtained graphene concrete has a compressive strength of 30.4Mpa, and a cyclic pressure of 1-10Mpa is applied to it, and the trend of its resistivity varying with pressure is measured as shown in Figure 3.
- a smart concrete containing multi-scale conductive materials consisting of the following components 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 dispersant, and carbon black 60 parts, 40 parts steel fiber.
- the obtained graphene concrete has a compressive strength of 38.4Mpa, and a cyclic pressure of 1-10Mpa is applied to it, and the trend of its resistivity changing with pressure is measured as shown in Figure 4.
- a smart concrete containing multi-scale conductive materials consisting of the following components 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 dispersant, and carbon black 60 parts, 120 parts of steel fiber.
- the obtained graphene concrete has a compressive strength of 31.3Mpa, and a cyclic pressure of 1-10Mpa is applied to it, and the trend of its resistivity changing with pressure is measured as shown in Figure 5.
- a smart concrete containing multi-scale conductive materials consisting of the following components by weight: 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, and carbon black 60 parts, 40 parts steel fiber.
- the obtained graphene concrete has a compressive strength of 25.6Mpa, and a cyclic pressure of 1-10Mpa is applied to it, and the trend of its resistivity changing with pressure is measured as shown in Figure 6.
- the invention discloses a cement-based smart concrete material containing three-scale conductive materials of graphene, carbon black and steel fiber (the three materials are nanometer, micrometer and millimeter scale respectively), which is composed of the following components: cement, sand, coarse Aggregate, water, graphene, carbon black, steel fiber and dispersant.
- the preparation method includes the following steps: first dissolving the dispersant in water, then adding graphene, placing the container in an ultrasonic generator to disperse the graphene to obtain a uniform graphene suspension; using a powder pneumatic mixer Mix the cement and carbon black; then mix the steel fiber, sand and coarse aggregate in a concrete mixer until uniform, add the mixed cement and carbon black during the mixing process; finally add the graphene suspension, and then mix evenly to obtain Mixed smart concrete. Place electrodes in the parts that need to be inspected, and then pour the mixed graphene concrete into the predetermined parts. By detecting the changes in resistivity between the electrodes, the changes in the stress and damage of the concrete structural members can be characterized. To achieve the purpose of real-time detection of the stress and damage state of the concrete structure.
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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
Description
Claims (7)
- 一种含多尺度导电材料的智能混凝土,其特征在于:由以下重量份的组分组成:水泥300-450份,砂子600-1350份,粗骨料0-1600份,水150-350份,石墨烯9-60份,分散剂9-60份,炭黑15-90份,钢纤维40-120份。
- 根据权利要求1所述的一种含多尺度导电材料的智能混凝土,其特征在于,所述的水泥采用普通硅酸盐水泥或硅酸盐水泥,等级为32.5、42.5或52.5。
- 根据权利要求1所述的一种含多尺度导电材料的智能混凝土,其特征在于,所述的石墨烯采用原状寡层石墨烯粉末,石墨烯片层厚度为<1nm,大小<1μm。
- 根据权利要求1所述的一种含多尺度导电材料的智能混凝土,其特征在于,所述的分散剂为萘系减水剂或聚羧酸减水剂。
- 根据权利要求1所述的一种含多尺度导电材料的智能混凝土,其特征在于,所述的炭黑颗粒尺寸不超过75μm。
- 根据权利要求1所述的一种含多尺度导电材料的智能混凝土,其特征在于,所述的钢纤维直径介于0.1-0.2mm,长度10-15mm。
- 一种含多尺度导电材料的智能混凝土的制备方法,其特征在于,包括以下步骤:1)将分散剂溶解于水中,然后加入石墨烯,置该容器于超声波发生器中对石墨烯进行打散和溶解,得到均匀的石墨烯悬浊液;2)用粉体气力混合机拌合水泥和炭黑;3)然后将钢纤维、砂子和粗骨料在混凝土搅拌机中拌和至均匀,搅拌过程中加入拌和好的水泥和炭黑;4)将石墨烯悬浊液加入搅拌均匀的干料中,再搅拌至均匀;5)将结构构件需检测的部位先置入电极,然后将拌合好的石墨烯混凝土浇筑入预定部位,通过检测电极间电阻率的变化,达到检测结构受力情况和受损情况变化的目的。
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