Multi-element solid waste recycled aggregate and preparation process thereof

A recycled aggregate and preparation technology, which is applied in the field of building materials, can solve the problems of poor durability and low strength, and achieve the effects of improved bonding performance, large specific surface area, and small particle size

Inactive Publication Date: 2021-07-23
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, construction materials such as cement and concrete aggregates made from these industrial wastes have low strength and poor durability.

Method used

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  • Multi-element solid waste recycled aggregate and preparation process thereof
  • Multi-element solid waste recycled aggregate and preparation process thereof
  • Multi-element solid waste recycled aggregate and preparation process thereof

Examples

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preparation example Construction

[0030] The invention provides a preparation process of multi-component solid waste regenerated aggregate, the preparation process flow chart is as follows figure 1 As shown, by the above parts by weight, comprising the following steps,

[0031] Weigh phosphogypsum, fly ash, and slag powder, stir in a mixer, and mix evenly to obtain a dry mixture;

[0032] Stir the water reducer, NaOH aqueous solution, water glass solution, water, and organic binder in a container evenly, and mix thoroughly to obtain a mixed liquid;

[0033] Put the dry mixture into the disc granulator, adjust the speed of the disc granulator and the water spray mode, spray the mixed liquid into the disc granulator, wet the dry mixture, and let it pass through the disc granulator. Dry blends form spherical particles;

[0034] Spherical particles are taken out, and 90-100% of the residue is sieved through the three-stage sieve tray to obtain raw materials with a pore size of 4.75mm;

[0035] Further sieve 95-...

Embodiment 1

[0041] A multi-component solid waste regenerated aggregate formula, which is composed of the following raw materials in parts by weight: 30 parts of phosphogypsum, 20 parts of fly ash, 20 parts of slag powder, 0.5 parts of water reducing agent, and 40% NaOH aqueous solution with a mass fraction of 2 parts, 2 parts of water glass solution with a mass fraction of 10%, 15 parts of water and 5 parts of silicone.

[0042] The above-mentioned preparation process of a multi-component solid waste recycled aggregate comprises the following steps,

[0043] S1. According to the weight ratio of raw materials, weigh phosphogypsum, fly ash, and slag powder and stir them in the mixer, and mix them evenly to obtain a dry mixture;

[0044] S2. Stir water, water reducing agent, NaOH aqueous solution with a mass fraction of 40%, water glass solution with a mass fraction of 10%, and silicone in a capacity bucket, and mix thoroughly to obtain a mixed liquid;

[0045]S3, put the dry blend prepared...

Embodiment 2

[0051] A multi-component solid waste regenerated aggregate formula, which is composed of the following raw materials in parts by weight: 35 parts of phosphogypsum, 23 parts of fly ash, 23 parts of slag powder, 0.7 parts of water reducing agent, and 2.3 parts of NaOH aqueous solution with a mass fraction of 40%. 2.3 parts of water glass solution with a mass fraction of 10%, 20 parts of water and 8 parts of polyurethane.

[0052] The above-mentioned preparation process of a multi-component solid waste recycled aggregate comprises the following steps,

[0053] S1. According to the weight ratio of raw materials, weigh phosphogypsum, fly ash, and slag powder and stir them in the mixer, and mix them evenly to obtain a dry mixture;

[0054] S2. Stir water, water reducing agent, NaOH aqueous solution with a mass fraction of 40%, water glass solution with a mass fraction of 10%, and polyurethane in a capacity bucket, and mix thoroughly to obtain a mixed liquid;

[0055] S3, put the dr...

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Abstract

The invention discloses a multi-element solid waste recycled aggregate and a preparation process thereof. The multi-element solid waste recycled aggregate is prepared by taking ardealite, fly ash, slag powder and a water reducing agent as raw materials and utilizing an alkaline activator, an active silicon-aluminum mineral admixture and an organic adhesive through a disc granulation balling process. Through carrying out a disc granulation pelletizing technology and natural hydration to generate ettringite and C-S-H gel to wrap and bond the remaining undissolved ardealite and the admixture together, thereby obtaining the novel building material. After the recycled aggregate is naturally hydrated and formed, the primarily formed aggregate is put into a steam curing box with the temperature being 100 + / -2 DEG C and the humidity being 95% or above so as to accelerate generation of C-S-H particles. The hydration rate is increased, the performance of the recycled aggregate is improved, the water absorption rate of the recycled aggregate is reduced, the water consumption of the recycled concrete is reduced, the strength of the recycled aggregate concrete is obviously improved, and the utilization rate of the recycled aggregate in the concrete is increased.

Description

technical field [0001] The invention relates to the technical field of building materials. More specifically, the present invention relates to a multi-component solid waste regenerated aggregate and its preparation process. Background technique [0002] With the development of industrial production, the amount of industrial solid waste is increasing day by day. The amount of industrial solid waste is huge, with various types and complex components, and it is difficult to deal with it. Today, only a limited number of industrial wastes are used, such as the United States, Sweden and other countries that use steel slag, and countries such as Japan and Denmark that use fly ash and coal slag. Other industrial solid wastes are still mainly stockpiled, and some hazardous industrial solid wastes are disposed of by landfill, incineration, chemical conversion and other methods. In fact, industrial waste can be turned into industrial raw materials or energy after proper processing. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14
CPCC04B28/143C04B2201/20C04B2201/50C04B24/42C04B22/062C04B12/04C04B18/08C04B18/141C04B2103/302C04B24/282
Inventor 覃铃玲李茂森刘浩然刘珺涵李婉淋
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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