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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 is directly mixed into the cement matrix, the agglomeration of graphene itself makes it impossible to improve the cement matrix. properties of the base material

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
Effect test

Embodiment 1

[0036] Embodiment 1: cement-based material without adding 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 it into the mold, lightly vibrate until it is dense, and standardize for 28 days.

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

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

[0040]...

Embodiment 2

[0044] Embodiment 2: graphene dosage is the graphene cement-based sensor of 0.5% of cement quality

[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, wherein the particle size of graphene is 7-8 μm , the thickness is less than 10nm, and the specific surface area is not less than 120m 2 / g. First weigh 1.575g of naphthalene-based superplasticizer powder, mix it with 162g of water evenly, add 0.225g (cement mass 0.05%) graphene powder into the naphthalene-based superplasticizer solution, and use an ultrasonic cell pulverizer with a power of 360W to ultrasonically 10min; repeat the above steps 4 times; then add 0.225g graphene powder to the above graphene dispersion, and use an ultrasonic cell pulverizer with a power of 720W to ultrasonicate for 10min; repeat the above steps 4 times until the amount of graphene is 2.25g ...

Embodiment 3

[0052] Embodiment 3: graphene dosage is the graphene cement-based sensor of 1% of cement quality

[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, wherein the particle size of graphene is 7-8 μm , the thickness is less than 10nm, and the specific surface area is not less than 120m 2 / g. First weigh 2.25g of naphthalene-based superplasticizer powder, mix it with 162g of water evenly, add 0.45g (cement mass 0.1%) graphene powder into the naphthalene-based superplasticizer solution, and use an ultrasonic cell pulverizer with a power of 360W to ultrasonically 15min; repeat the above steps 4 times; then add 0.45g graphene powder to the above graphene dispersion, and use an ultrasonic cell pulverizer with a power of 720W for 30min; repeat the above steps 4 times until the graphene content is 4.5g . Finally, an ultrasonic...

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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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