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Graphene nanosheet modified cement-based material with piezoresistive effect and preparation method thereof

A technology of graphene nanosheets and cement-based materials, which is applied in the field of cement-based material preparation, and can solve the problems of cement-based materials such as comprehensive performance, unfavorable economic efficiency, adverse effects on mechanical strength, and inability to obtain ideal piezoresistive effects.

Inactive Publication Date: 2019-07-02
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, studies have shown that due to various factors such as the electrical conductivity, physical and mechanical properties of the above-mentioned materials, or the combination with the cement matrix, the current cement-based materials are still limited in terms of simultaneously improving their pressure-sensitive properties and mechanical properties and engineering intelligent applications. There is a lot of room for improvement
[0004] In addition, the following problems exist in the current application of nanomaterials to modify cement-based materials to have piezoresistive effects: first, nanomaterials cannot form a uniform dispersion system; second, in order to obtain good piezoresistive effects, it is necessary to add more A large amount of nanomaterials is very unfavorable to other comprehensive properties and economical efficiency of cement-based materials, but when the amount of nanomaterials is reduced, the ideal piezoresistive effect cannot be obtained; thirdly, although some nano-modified materials It can improve the piezoresistive effect of cement-based materials, but has adverse effects on its mechanical strength and other properties

Method used

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  • Graphene nanosheet modified cement-based material with piezoresistive effect and preparation method thereof
  • Graphene nanosheet modified cement-based material with piezoresistive effect and preparation method thereof
  • Graphene nanosheet modified cement-based material with piezoresistive effect and preparation method thereof

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Experimental program
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Effect test

Embodiment A1

[0029] Polyacrylate aqueous solution: graphene nanosheets, polycarboxylate water reducing agent, shrinkage reducing agent, defoamer, water, cement: fly ash=0.1 part: 0.025 part: 0.12 part: 0.38 part: 0.2 part: 16.175 part: 45 servings: 38 servings.

Embodiment A2

[0031] Polyacrylate aqueous solution, graphene nanosheets, polycarboxylate water reducer, shrinkage reducing agent, defoamer, water, cement: fly ash=0.12 parts: 0.03 parts: 0.2 parts: 0.8 parts: 0.5 parts: 16.35 parts: 40 servings: 42 servings.

Embodiment A3

[0033] Polyacrylate aqueous solution, graphene nanosheets, polycarboxylate water reducing agent, shrinkage reducing agent, defoamer, water, cement: fly ash=0.15 parts: 0.055 parts: 0.2 parts: 0.8 parts: 0.5 parts: 18.295 parts: 50 servings: 30 servings.

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Abstract

The invention discloses a graphene nanosheet modified cement-based material with a piezoresistance effect. The material is prepared from the following ingredients in parts by weight: 0.1-0.24 part by weight of polyacrylate, 0.02-0.3 part by weight of graphene nanosheets, 0.12-0.6 part by weight of a poly carboxylic acid water reducer, 0.3-2 parts by weight of a shrinkage reducing agent, 0.18-2 parts by a weight defoamer, 12-20 parts by weight of water, 40-60 parts by weight of cement and 20-50 parts by weight of fly ash. The invention also discloses a preparation method of the material. The preparation method has simple operation and low cost, and the prepared graphene nanosheet modified cement-based material with the piezoresistance effect has a better piezoresistance effect, better mechanical properties and better unification of economy and practicality.

Description

technical field [0001] The invention relates to the field of cement-based material preparation, in particular to a graphene nanosheet modified cement-based material with piezoresistive effect and a preparation method. Background technique [0002] Nowadays, a large amount of infrastructure construction is still going on, so the demand for cement-based materials is bound to increase further. Take a large number of major civil engineering projects related to the national economy and people's livelihood that have been completed, are under construction or will continue to be constructed in the future, such as the high-speed railway and rail transit that cross the Yangtze River Tunnel or the Yangtze River Bridge. These super infrastructure projects mainly use large-scale cement-based Material, its harsh service environment puts forward higher performance requirements for concrete. Since the concrete structure is prone to sudden damage during the continuous loading and unloading ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B18/08C04B24/2641C04B22/02C04B2103/302C04B2103/50C04B2103/0068
Inventor 秦先涛祝斯月姜艺何晓鸣何翔程英伟陆蓉王富游其勇张正亚
Owner WUHAN POLYTECHNIC UNIVERSITY
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