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Modified graphene modified cement-based composite material and preparation method thereof

A graphene modification and composite material technology, applied in the field of building materials, can solve the problems of difficult dispersion, uneven distribution of force, easy agglomeration, etc., and achieve the effects of improving compressive strength, easy access to raw materials, and simple preparation methods

Active Publication Date: 2021-03-19
GUILIN UNIVERSITY OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because the performance improvement of graphene and carbon nanotubes lies in their dispersion. If the dispersion is uneven, it will easily lead to uneven internal reinforcement of cement-based composite materials, which will lead to uneven force distribution.
The existence of π-π bonds between graphene sheets and van der Waals force makes it easy to agglomerate, making it difficult to prepare a uniform and stable graphene dispersion. Capacitance also makes it difficult to disperse evenly in cement-based composites, so that it cannot fully exert its reinforcing effect

Method used

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  • Modified graphene modified cement-based composite material and preparation method thereof
  • Modified graphene modified cement-based composite material and preparation method thereof

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preparation example Construction

[0029] The preparation method of the modified multilayer graphene is:

[0030] (a) Weigh 4g multilayer graphene, place it in 400mL of 0.05mol / L sodium chlorate, 0.05mol / L sulfuric acid and 0.05mol / L hydrogen peroxide mixed solution, heat the solution to 35°C and stir Oxidation was performed for 15 minutes, the supernatant liquid was poured off after standing, the solid matter in the lower layer was washed with absolute ethanol and deionized water, and the obtained solid matter was dried at 60°C to obtain carboxyl-modified multilayer graphene;

[0031] (b) Add the carboxy-modified multi-layer graphene of step (a) to 0.02g / L dodecyltrimethylammonium bromide solution, heat to 50°C and stir evenly, then slowly add 0.3g poly Amide-amine dendrimers, reflux reaction for 4h, during the reaction, the solution was stirred and ultrasonic treatment was applied;

[0032] (c) After the reaction, the reaction solution is centrifugally settled, washed with absolute ethanol and deionized wate...

Embodiment 1

[0037] A modified graphene-modified cement-based composite material, comprising 30 parts of sulfoaluminate cement, 50 parts of quartz sand, 10 parts of fly ash, 5 parts of reinforcing fiber, and 3 parts of modified multilayer graphite in parts by weight olefin, 1 part of naphthalene-based high-efficiency water reducer, 1 part of defoamer, 10 parts of water; the reinforcing fiber is steel fiber, and the aspect ratio of the reinforcing fiber is 20:1. The solid content of the naphthalene-based high-efficiency water reducer is 30%, and the water reducing rate is between 30%. The defoamer is a phosphate defoamer.

[0038] The preparation method of described cement-based composite material, comprises the steps:

[0039](1) Add the modified multilayer graphene into water under stirring and ultrasonic treatment conditions, and finally obtain the modified multilayer graphene that can be uniformly and stably dispersed in water, and then add naphthalene-based high-efficiency water reduc...

Embodiment 2

[0043] A modified graphene-modified cement-based composite material, comprising 50 parts of Portland cement, 80 parts of quartz sand, 20 parts of fly ash, 10 parts of reinforced fiber, and 7 parts of modified multilayer graphene in parts by weight , 3 parts of naphthalene-based superplasticizer, 2 parts of defoamer, 30 parts of water; the reinforcing fiber is glass fiber, and the aspect ratio of the reinforcing fiber is 30:1. The solid content of the naphthalene-based high-efficiency water reducer is 40%, and the water reducing rate is between 50%. The defoamer is a silicone defoamer.

[0044] The preparation method of described cement-based composite material, comprises the steps:

[0045] (1) Add the modified multilayer graphene into water under stirring and ultrasonic treatment conditions, and finally obtain the modified multilayer graphene that can be uniformly and stably dispersed in water, and then add naphthalene-based high-efficiency water reducer and defoamer respect...

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Abstract

The invention provides a modified multilayer graphene modified cement-based composite material, which is characterized by comprising the following components by weight: 30-50 parts of cement, 50-80 parts of quartz sand, 10-20 parts of fly ash, 5-10 parts of reinforced fibers, 3-7 parts of modified multilayer graphene, 1-3 parts of a naphthalene-based superplasticizer, 1-2 parts of a defoaming agent and 10-30 parts of water. According to the preparation method, carboxyl and polyamide-amine dendritic polymers are adopted for jointly modifying multi-walled carbon nanotubes for the first time, sothat the properties such as compressive strength and breaking strength can be remarkably improved; the reinforced fibers are uniformly dispersed in the slurry structure so as to be firmly combined with the cement-based material, so that the crack resistance and the excellent impact resistance of the cement-based composite material are improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a modified graphene-modified cement-based composite material and a preparation method thereof. Background technique [0002] Cement-based composite materials are widely used in infrastructure and engineering construction. With the development of the times, ordinary composite materials still have many shortcomings. In recent years, nano-materials such as carbon nanotubes, carbon fibers and graphene have been used to modify cement-based composite materials. , Enhancement has made a lot of progress. The excellent mechanical, electrical, and thermal properties of graphene make it an important material for enhancing the tensile strength, toughness, and electrical properties of cement-based materials. With its volume effect, surface effect, and filling effect in the matrix, graphene shows good application prospects in improving the tensile strength, toughness, p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B28/06C04B20/02C04B14/02C04B111/20
CPCC04B28/04C04B28/06C04B28/065C04B20/023C04B2201/50C04B2201/52C04B2111/2038C04B14/024C04B14/06C04B18/08C04B14/48C04B2103/302C04B24/003C04B14/42C04B24/42
Inventor 李玲明阳陈平胡成李青甘国兴潘格林
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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