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Method for reinforcing recycled concrete by using graphene oxide

A technology for recycling concrete and graphene, which is applied in the field of building materials to achieve the effects of ultra-high strength and flexibility, reasonable design, and improved mechanical properties and durability

Active Publication Date: 2017-09-05
宁夏赛马科进混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main content of the present invention is a method of using graphene oxide to strengthen recycled concrete, using graphene oxide to improve the strength of recycled concrete, providing a recycled concrete containing graphene oxide, and solving the defects of existing recycled concrete strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Prepare cement, fine sand, recycled coarse aggregate, graphene oxide, water and water reducer as raw materials; the weight percentage of oxygen in the graphene oxide is 25%;

[0034] Graphene oxide is added with water to make dispersion liquid, and the weight concentration of graphene oxide is 1.0%;

[0035] Add water to the water reducer to make a water reducer solution with a concentration of 30% by weight;

[0036] Add the dispersion liquid to the water reducer solution. In order to prevent flocculation, first stir for 15 minutes, and then ultrasonically treat it for 15 minutes to make a mixed liquid; the volume ratio of the dispersion liquid and the water reducer solution is 1:0.4;

[0037] Sieve the regenerated coarse aggregate to get the part with a particle size of 5-25mm, then mix it with fine sand and stir for 60s, then add cement and stir for 20-40s to obtain the mixture; the weight mixing ratio of regenerated coarse aggregate, fine sand and cement is 1:0.4:0...

Embodiment 2

[0040] Method is with embodiment 1, and difference is:

[0041] (1) the weight concentration of graphene oxide in the dispersion is 0.8%;

[0042] (2) Add water to the water reducer to make a water reducer solution with a weight concentration of 25%;

[0043] (3) Add the dispersion liquid into the water reducer solution and stir for 10 minutes, and then ultrasonically treat it for 20 minutes; the volume ratio of the dispersion liquid and the water reducer solution is 1:0.3;

[0044] (4) The regenerated coarse aggregate with a particle size of 5-25 mm is mixed with fine sand for 40-80 seconds, and cement is added for 20 seconds; the weight mixing ratio of recycled coarse aggregate, fine sand and cement is 1:0.5:0.4;

[0045] (5) The ratio of the mixed solution to the mixture is 0.05% of the total weight of the cement based on graphene oxide, and the stirring is continued for 5 minutes; the strength of curing for 7 days is 28.7MPa, the strength of curing for 14 days is 36.9MPa,...

Embodiment 3

[0047] Method is with embodiment 1, and difference is:

[0048] (1) the weight concentration of graphene oxide in the dispersion is 1.2%;

[0049] (2) Add water to the water reducer to make a water reducer solution with a weight concentration of 35%;

[0050] (3) Add the dispersion liquid to the water reducer solution and stir for 20 minutes, and then ultrasonically treat it for 18 minutes; the volume ratio of the dispersion liquid and the water reducer solution is 1:0.5;

[0051] (4) The regenerated coarse aggregate with a particle size of 5-25 mm is mixed with fine sand for 40-80 seconds, and cement is added for 40 seconds; the weight mixing ratio of recycled coarse aggregate, fine sand and cement is 1:0.4:0.4;

[0052](5) The proportion of the mixture added to the mixture is based on graphene oxide being 0.085% of the total weight of the cement, and the stirring is continued for 2 minutes; the strength of curing for 7 days is 28.6MPa, the strength of curing for 14 days is ...

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Abstract

The invention relates to a method for reinforcing recycled concrete by using graphene oxide. The method comprises the following steps: (1) preparing raw materials; (2) adding water into the graphene oxide to prepare dispersion liquid; (3) adding water into a water reducing agent to prepare a water reducing agent solution; (4) adding the dispersion liquid into the water reducing agent solution, stirring and then carrying out ultrasonic treatment for 15-20min to prepare a mixed solution; (5) screening recycled coarse aggregate, then mixing the screened material with fine sand and stirring, adding cement into the obtained mixture and stirring; (6) adding the mixed solution into the mixture under the condition of stirring, putting the product into a test mould after stirring, evenly vibrating on a vibration table, and then curing in a curing room. The method provided by the invention is reasonable in design and simple and convenient to operate; a rich lamellar structure of the graphene oxide contains a great deal of oxygen-containing active groups, so that growth points are provided for hydration products of the cement; a template effect for hydration of the concrete is achieved, and the mechanical properties and durability of the recycled concrete are improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a method for strengthening recycled concrete with graphene oxide. Background technique [0002] After entering the 21st century, human beings are faced with problems such as resource shortage, population expansion and environmental degradation. The development of circular economy is a new trend in the global economy. So far, concrete is still the most important material for civil engineering and various infrastructure constructions. Among the various raw materials of concrete, coarse aggregate is the largest proportion. As the use of concrete continues to increase, the amount of coarse aggregate consumed also shows a geometric growth trend. At the same time, according to statistics, construction waste accounts for 40% of industrial solid waste, most of which are waste concrete, so the reuse and development of waste concrete has followed the development of the times. ...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2111/00017C04B14/06C04B18/16C04B14/024C04B2103/302
Inventor 郭凯王强孟宪宏刘琳王刚潘文浩刘丹旸吴金国马浩辉富恩昊
Owner 宁夏赛马科进混凝土有限公司
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