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

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 nano-sheet 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, therefore, the demand for cement-based materials is bound to increase further. Take, for example, a large number of major civil engineering projects related to the national economy and people’s livelihood, such as the high-speed railway and rail transit crossing the Yangtze River tunnel or the Yangtze River Bridge. Material, its harsh environment puts forward higher performance requirements for concrete. Because the concrete structure is prone to sudden damage during the continuous cycle of loading and unloading, resulting in major property losses and casualties, the safety of the cement concrete structure is carried out in real time while improving the convent...

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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

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