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Method of modifying and reinforcing cement-based composite via thermally-reduced graphene-carbon nanotubes

A technology for carbon nanotube modification and composite materials, which is applied in the field of heat-reduced graphene-carbon nanotube modification and reinforced cement-based composite materials, which can solve the problems of limiting the performance of the modified matrix and achieve excellent salt corrosion resistance. Wrapping effect and high flexural strength

Inactive Publication Date: 2019-01-04
太和县鑫泰高科新型建筑材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The dispersion problem limits the performance of its modified matrix; in addition, the high cost of nanomaterials makes it difficult to use in cement mixtures.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for modifying and strengthening cement-based composite materials with heat-reduced graphene-carbon nanotubes, is characterized in that it comprises the steps of:

[0031] (1) Dispersion of nano-silica:

[0032] Ultrasound 50 parts of nano-silica in water for 4 minutes, add 100 parts of silica fume to it, and then sonicate for 2 minutes, so that nano-silica is fully adsorbed on the surface of micron materials, and silica fume adsorption pre-dispersed nano-silica is obtained;

[0033] (2) Preparation of heat-reduced graphene dispersion:

[0034] Add 4 parts of dispersant slump-preserving polycarboxylate superplasticizer to 170 parts of calcium hydroxide solution, and ultrasonically treat it for 1 hour to prepare a dispersant solution. Graphene dispersion;

[0035] (3) Forming and maintenance of cement-based composite materials:

[0036] Add water to 0.4 parts of dispersant, heat to 50-60°C and stir to dissolve completely, add modified multi-walled carbon nanot...

Embodiment 2

[0041] A method for modifying and strengthening cement-based composite materials with heat-reduced graphene-carbon nanotubes, is characterized in that it comprises the steps of:

[0042] (1) Dispersion of nano-silica:

[0043] Ultrasonicate 60 parts of nano-silica in water for 5 minutes, add 120 parts of silica fume into it, and then ultrasonicate for 4 minutes, so that nano-silica is fully adsorbed on the surface of micron materials, and pre-dispersed nano-silica for silica fume adsorption is obtained;

[0044] (2) Preparation of heat-reduced graphene dispersion:

[0045] Add 9 parts of dispersant slump-retaining polycarboxylate water reducer to 190 parts of calcium hydroxide solution, and ultrasonically treat it for 2 hours to prepare a dispersant solution, add 20 parts of thermally reduced graphene to it, and ultrasonically shake for 2 hours to form a thermally reduced Graphene dispersion;

[0046] (3) Forming and maintenance of cement-based composite materials:

[0047]...

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Abstract

The invention discloses a method of modifying and reinforcing cement-based composite via thermally-reduced graphene-carbon nanotubes. The method includes: adding water into a dispersant, heating, stirring to allow full dissolution, adding modified multi-walled carbon nanotubes, magnetically stirring, carrying out ultrasonic treatment, cooling to room temperature, adding a defoaming agent before stirring, pouring into a cement mortar mixer, adding cement, standard sand, water, a water reducer, silica fume-adsorbed pre-dispersed nano silica and thermally-reduced graphene dispersion, mixing well,loading in a standard cement triplex mold, smoothing, vibrating, forming, covering with wet cloth, demolding, transferring into a standard maintenance box, and carrying out standard maintenance to obtain a cement-based composite. Carbon nanotubes are treated with dichloromethane and metachloroperbenzoic acid; the treated carbon nanotubes are used to prepare cement mortar having high compressive strength, breaking strength and flexural strength; good reinforcement can be achieved just via a low content of modified carbon nanotubes.

Description

technical field [0001] The invention belongs to the field of cement-based composite materials, and in particular relates to a method for modifying and strengthening cement-based composite materials with heat-reduced graphene-carbon nanotubes. Background technique [0002] Cement-based materials have become one of the most important building materials due to the advantages of abundant raw materials, low price, simple production process, and high strength, and are widely used in modern engineering constructions such as civil buildings, municipal engineering, water conservancy engineering, and tunnel engineering. However, with the rapid development of human society, modern architecture puts forward new requirements for cement-based materials, not only to have good mechanical behavior, but also to have as many additional functions as possible to achieve multi-functionality on the same product or structure. , Small-scale integration and intelligence, to meet and promote the needs...

Claims

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Application Information

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IPC IPC(8): C04B28/02
CPCC04B28/02C04B2111/20C04B2201/50C04B14/062C04B14/024C04B14/026C04B14/06C04B2103/302C04B24/003C04B24/2652
Inventor 常凤东
Owner 太和县鑫泰高科新型建筑材料有限公司
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