Low-cost graphene oxide mortar and preparation method thereof

A graphene, low-cost technology, applied in the direction of chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems of reducing water-cement ratio, price increase, limited strength and durability, etc., to achieve a large proportion of surface area, The effect of improving plastic retention and good dispersibility

Pending Publication Date: 2018-06-01

FOSHAN UNIVERSITY

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Problems solved by technology

[0004] (1) Reduce the water-cement ratio. The problem in this method is that the smaller the water-cement ratio, the higher the strength, but it does not improve the cement hydration capacity, and cannot fundamentally improve the gel microstructure. The strength and durability of the material play a limited role

At the same time, the reduction of water-cement ratio means that the amount of cement will increase, and the price will increase accordingly, and the mass production of cement will cause more environmental pollution;

[0005] (2) Adding fibers (such as carbon fibers, steel fibers, glass fibers), the main problem of this method is that this technology only prevents the crack growth of cement-based composite materials from a macroscopic perspective, but does not improve the hydration capacity of cement, and cannot fundamentally Improve the microstructure of the gel, ...

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Method used

(1) 0.9 part of polycarboxylate high-performance water-reducer is joined in 180 parts of water, uniformly stirred for 90s, and is recorded as solution 1, wherein polycarboxylate high-efficiency water-reducer density is 1.0~1.1g/ml, solid The content is 18%-20%, the pH value is 6-7, the water reduction rate is 15%-30%, the compressive strength ratio of 7d and 28d is not less than 180%, and the graphene oxide nanosheets in the raw material of the graphene oxide solution The solid content is 1.6%, the thickness of the graphene oxide nanosheets is 1-2nm, the sheet diameter is 10μm, the purity is >99%, and the surface of the graphene oxide nanosheets has a large number of oxygen-contain...

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Abstract

The invention discloses low-cost graphene oxide mortar and a preparation method thereof. The graphene oxide mortar is prepared from the following raw materials in parts by mass: 450 parts of cement, 180 parts of water, 1350 parts of natural river sand, 0.9 part of polycarboxylate superplasticizer, and 16.9 parts of graphene oxide solution raw material. The preparation method of the graphene oxidemortar comprises the steps of proportioning the raw materials, mixing the raw materials, pouring, forming and maintaining, and is simple and easy to operate. By adopting the graphene oxide mortar prepared through the invention, through optimizing the coordinate proportion of the raw materials, and adding the graphene oxide solution raw material, the concrete prepared from the graphene oxide mortarmeets the strength requirement, the price is low, and the price of the graphene oxide mortar prepared through the invention is a half of the price of a like product prepared by other technologies.

Application Domain

Carbon compounds

Technology Topic

River sandGraphite oxide +5

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[0030] In the following, the concept, specific structure and technical effects of the present invention will be clearly and completely described in conjunction with the embodiments to fully understand the purpose, features and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work belong to The scope of protection of the present invention. The various technical features in the invention can be combined interactively on the premise of not conflicting with each other.

[0031] A method for preparing low-cost graphene oxide mortar includes the following steps:

[0032] (1) Add 0.9 parts of polycarboxylic acid superplasticizer to 180 parts of water, stir evenly for 90s, and record as solution 1. The polycarboxylic acid superplasticizer has a density of 1.0~1.1g/ml and a solid content of 18 %-20%, PH value of 6-7, water reduction rate of 15%-30%, 7d, 28d compressive strength ratio not less than 180%, the solid content of graphene oxide nanosheets in the graphene oxide solution raw material is 1.6%, the thickness of the graphene oxide nanosheet layer is 1 to 2 nm, the sheet diameter is 10 μm, and the purity is greater than 99%, and the surface of the graphene oxide nanosheet has a large number of oxygen-containing groups, which has good hydrophilicity and is non-conductive.

[0033] (2) Add 16.9 parts of the graphene oxide solution raw materials to solution 1, stir uniformly for 90 seconds, and wait for use after stirring, and record it as solution 2.

[0034] Wherein, the raw material of the graphene oxide solution is prepared according to the following method:

[0035] 1) Select graphite or expanded graphite with a particle size of 10-20μm and a purity of 99% as raw materials;

[0036] 2) Add graphite raw material and sodium nitrate to the concentrated sulfuric acid solution, wherein the mass ratio of graphite raw material and sodium nitrate is 1:1;

[0037] 3) The solution obtained in step 2) is subjected to ice bath treatment, and during the ice bath treatment, potassium permanganate is slowly added to the solution in step 2), where the mass ratio of potassium permanganate to graphite raw material is 3:1~8:1, after mixing uniformly, the solution is heated to 50~80℃ for further oxidation reaction;

[0038] 4) After the oxidation reaction of the solution in step 3) is completed, pour the solution into deionized water, and add hydrogen peroxide to remove excess potassium permanganate, thereby obtaining a bright yellow graphene oxide solution;

[0039] 5) Centrifuging the graphene oxide solution obtained in step 4) and repeatedly washing with deionized water to finally obtain the graphene oxide solution raw material.

[0040] (3) Add 450 parts of cement and solution 2 to the mixer in turn, and mix them evenly and slowly for 30 seconds. The cement is P.42.5R ordinary Portland cement and has good compatibility with the polycarboxylic acid superplasticizer; The fineness modulus of natural river sand is 2.6, and the bulk density is 1450kg/m 3.

[0041] (4) Then, 1350 parts of natural river sand are added to the mixer at a uniform speed within 30 seconds, stirred quickly for 60 seconds, stopped for 90 seconds, and finally stirred uniformly and quickly for 60 seconds, and discharged to obtain the prepared graphene oxide mortar mixture.

[0042] (5) Pour the graphene oxide mortar mixture into the mold, fill it in twice, fill the mold 1/2 each time, and place it on a vibrating table for 60 times to avoid over-vibration, and finally wait for it. After molding, oxygen protection is performed, and the oxygen protection method includes the following steps:

[0043] A. After the graphene oxide mortar mixture is poured into a mold for forming and compaction, it is placed in a standard curing room with a temperature of 20±2°C and a relative humidity of ≧95% for 48 hours, and then the mold is removed;

[0044] B. After removing the mold, place the test piece in the water tank in the standard curing room, and cure to the required age. The water tank solution is saturated Ca(OH) 2 The solution and temperature are 20±2℃.

[0045] Table 1 shows the compressive strength and flexural strength of the graphene oxide mortar prepared by the method of the present invention at different ages. It can be seen that the appropriate amount of graphene oxide nanosheets is mixed into the mortar to adjust the hydration of the cement and significantly improve the mechanical properties of the cement mortar.

[0046] Table 1 Compressive strength and flexural strength of graphene oxide mortar at different ages

[0047]

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Classification and recommendation of technical efficacy words

Improve plastic retention
Good dispersion

Method for controlling cracking by carrying out grouting reinforcement on thin-walled structures in building

ActiveCN105756362AImprove plastic retentionReinforced structure is denseBuilding repairsThin walledFiber

Owner:杭州固特建筑加固技术工程有限公司

Low-cost graphene oxide mortar and preparation method thereof

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Problems solved by technology

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Description & Claims & Application Information

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