Modified graphene cement-based composite material, and preparation and application of material

A composite material and graphene technology, applied in the direction of instruments, measuring devices, measuring force, etc., can solve problems such as easy agglomeration, poor hydrophilicity of graphene, and inability to improve the performance of cement-based materials, etc., to achieve good dispersion and sensory sensitivity The effect of high and broad application prospects

Inactive Publication Date: 2018-02-02
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the hydrophilicity of graphene is relatively poor, and the van der Waals force between particles makes it very easy to agglomerate. If graphene powder

Method used

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  • Modified graphene cement-based composite material, and preparation and application of material
  • Modified graphene cement-based composite material, and preparation and application of material
  • Modified graphene cement-based composite material, and preparation and application of material

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0036] Example 1: Cement-based material without modified graphene

[0037] Add 202.5g of water to 450g of cement, use a mortar mixer to stir slowly until uniform, slowly add 1350g of standard sand and continue to stir evenly, pour into the mold, vibrate gently until it is dense, and cure for 28 days.

[0038] The compressive strength of the modified graphene cement-based composite material is 55 MPa, and the flexural strength is 8.2 MPa.

[0039] In size 80×40×40mm 3 Four electrodes are embedded in the graphene cement-based composite material test block to obtain a pressure-sensitive sensor, and the four electrodes are sequentially distributed on the same surface of the test block from left to right, and are distributed symmetrically about the central axis of the test block surface, forming Two inner electrodes and two outer electrodes, the distance between the two inner electrodes is 40 mm, and the distance between the two outer electrodes is 60 mm.

[0040] Apply a DC voltage of 10V...

Example Embodiment

[0044] Example 2: Graphene cement-based sensor with graphene content 0.5% of cement mass

[0045] A modified graphene cement-based composite material is composed of water, cement, graphene, naphthalene-based water reducing agent (provided by Nanjing Subote New Material Co., Ltd.), and standard sand. The particle size of the graphene is 7-8μm , The thickness is less than 10nm, the specific surface area is not less than 120m 2 / g. First weigh 1.575g of naphthalene-based water-reducing agent powder, mix it with 162g of water, add 0.225g (0.05% of cement mass) graphene powder to the naphthalene-based water-reducing agent solution, and use a 360W ultrasonic cell pulverizer ultrasonic 10min; Repeat the above steps 4 times; then add 0.225g of graphene powder to the above graphene dispersion, use an ultrasonic cell crusher with a power of 720W to sonicate for 10min; repeat the above steps 4 times until the graphene content is 2.25g . Finally, an ultrasonic cell crusher with a power of ...

Example Embodiment

[0052] Example 3: Graphene cement-based sensor with graphene content of 1% of cement mass

[0053] A modified graphene cement-based composite material is composed of water, cement, graphene, naphthalene-based water reducing agent (provided by Nanjing Subote New Material Co., Ltd.), and standard sand. The particle size of the graphene is 7-8μm , The thickness is less than 10nm, the specific surface area is not less than 120m 2 / g. Weigh 2.25g naphthalene water-reducing agent powder, mix it with 162g water, add 0.45g (cement mass 0.1%) graphene powder to the naphthalene-based water-reducing agent solution, and use a 360W ultrasonic cell pulverizer ultrasonic 15min; Repeat the above steps 4 times; then add 0.45g of graphene powder to the above graphene dispersion, use an ultrasonic cell pulverizer with a power of 720W to sonicate for 30min; repeat the above steps 4 times until the graphene content is 4.5g . Finally, an ultrasonic cell crusher with a power of 1200W was used to soni...

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Abstract

The invention relates to a modified graphene cement-based composite material, and a preparation and application of the material. The modified graphene cement-based composite material comprises the following components in parts by mass: 30-50 parts of water, 100 parts of cement, 0.35-2 parts of a naphthalene water reducer, 0.5-4 parts of graphene and 100-300 parts of standard sand. The preparationprocess comprises the following steps: 1) preparing a naphthalene water reducer solution; 2) preparing a modified graphene suspension; and 3) preparing the modified graphene cement-based composite material. Compared with the prior art, the graphene cement-based composite material disclosed by the invention has the advantages of simple preparation process, high mechanical strength, good durability,compact structure and the like; a pressure-sensitive sensor prepared by using the material has the advantages of sensitive stress and strain monitoring signals, low signal-to-noise ratio, stable service, good compatibility with concrete and the like. The pressure-sensitive sensor has a wide application prospect in the fields of concrete structure monitoring, traffic flow statistics, road surfacedeicing and the like.

Description

technical field [0001] The invention relates to a modified graphene cement-based composite material and its preparation and application, belonging to the field of cement-based composite materials. Background technique [0002] The health monitoring of major concrete structural engineering and infrastructure has become more and more important to human beings, and has become an inevitable trend in the development of the civil engineering industry, mainly due to the harsh natural environment and the aging of materials themselves will cause catastrophic damage to the structure , thus posing a very serious threat to the safety of people's lives and properties. Based on the existing technology, the pressure-sensitive sensors that can be applied to the health monitoring of concrete structures mainly include carbon nanotube-reinforced cement-based materials, emulsion-modified graphene cement-based composite materials, etc. However, these sensors have high cost, complicated preparati...

Claims

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Application Information

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IPC IPC(8): C04B28/04G01L1/00C04B14/02C04B111/94
Inventor 张云升徐凯丽吴志涛张王田刘乃东
Owner SOUTHEAST UNIV
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