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A kind of engineering spoil lightweight recycled aggregate and its preparation method and application

A technology of recycled aggregate and engineering spoil, applied in the field of building materials, can solve problems such as ecological environment damage

Active Publication Date: 2021-10-29
SHENZHEN HUAWEI ENVIRONMENTAL PROTECTION BUILDINGMATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the project spoils are simply disposed of through open-air stacking and landfilling, which takes up a lot of land resources and causes varying degrees of damage to the local ecological environment.
However, the resource utilization rate of construction waste in my country is less than 10%, and the resource treatment of engineering spoils is just in its infancy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] The invention provides a method for preparing engineering spoil lightweight recycled aggregate, comprising the following steps:

[0022] Spray magnesium chloride solution into the main material, and carry out granulation to obtain light recycled aggregate main material granules; the main material includes the following components in parts by mass: 400-3600 parts of engineering spoil micro-powder, 480-1945 parts of light-burned magnesium oxide 400-3600 parts of red brick powder, 0-400 parts of fly ash, 0-1.5 parts of light core material; based on the number of light-burned magnesia, the mass parts of magnesium chloride hexahydrate used for preparing the magnesium chloride solution The number is 790~3190 parts, and the mass parts of water used is 310~1250 parts;

[0023] Pre-curing the main material particles of the lightweight recycled aggregate to obtain primary lightweight recycled aggregate;

[0024] The primary lightweight recycled aggregate is soaked in an aqueous ...

Embodiment 1

[0048] In this embodiment, all raw materials are calculated according to parts by mass:

[0049] Mix 1545 parts of light-burned magnesia, 400 parts of red brick powder, 3600 parts of spoil micro-powder and 400 parts of fly ash, and stir for 15 minutes to obtain the main ingredient;

[0050] Dissolving 2700 parts of magnesium chloride hexahydrate in 1000 parts of water to obtain a magnesium chloride solution with a mass concentration of 34%;

[0051] Adjust the inclination angle of the disc granulator to 60°, and the rotating speed is 45r / min. The disc of the disc granulator is covered with the main material, the thickness is 2mm, the disc is rotated, and the magnesium chloride solution is sprayed. Spread the main material, carry out the granulation, and then repeat the above steps of spraying and granulation until the main material granules of lightweight recycled aggregate with an average particle size of 10mm are obtained;

[0052] The primary lightweight recycled aggregate...

Embodiment 2

[0058] In this embodiment, all raw materials are calculated according to parts by mass:

[0059] Mix 480 parts of light-burned magnesia, 800 parts of red brick powder and 3200 parts of spoil micropowder, and stir for 15 minutes to obtain the main ingredients except the light core material, which are recorded as the main ingredient premix;

[0060] 790 parts of magnesium chloride hexahydrate were dissolved in 700 parts of water to obtain a magnesium chloride solution with a mass concentration of 24.8%;

[0061] Soak 1.5 parts of ceramsite in a magnesium chloride solution with a mass concentration of 24.8% for 1 min, filter out, remove the water droplets on the surface, and obtain ceramsite in a saturated surface dry state;

[0062] Adjust the inclination angle of the disc granulator to 60 °, and the rotating speed is 45r / min, and the disc of the main material premix is ​​fully covered with the disc granulator, and the thickness is 2mm, and the disc granulator is started. Add c...

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Abstract

The invention provides a lightweight regenerated aggregate of engineering spoil and its preparation method and application, belonging to the technical field of building materials. The preparation method of engineering spoil lightweight recycled aggregate provided by the present invention comprises the steps of: spraying magnesium chloride solution into the main material, and performing granulation to obtain the main material granules of lightweight recycled aggregate; the main material includes the following parts by mass: Components: 400-3600 parts of engineering spoil micropowder, 480-1945 parts of light-burned magnesium oxide, 400-3600 parts of red brick powder, 0-400 parts of fly ash, 0-1.5 parts of light core material; Pre-cure the main material particles of high-quality recycled aggregates to obtain primary lightweight recycled aggregates; soak the primary lightweight recycled aggregates with an aqueous enhancer solution and treat them into a saturated surface-dry state, and then perform deep maintenance to obtain engineering spoils Lightweight recycled aggregate. In the raw material of the present invention, engineering waste soil micropowder is used in a large amount, which provides a new direction for the utilization of engineering waste soil.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a lightweight regenerated aggregate of engineering spoil and its preparation method and application. Background technique [0002] According to incomplete statistics, the amount of engineering spoils produced by development and construction projects in large and medium-sized cities accounts for 15% to 20% of the total amount of urban waste discharge. At present, most of the project spoils are simply disposed of through open-air stacking and landfilling, which occupy a large amount of land resources and cause varying degrees of damage to the local ecological environment. However, the resource utilization rate of construction waste in my country is less than 10%, and the resource treatment of engineering spoils is just in its infancy. [0003] Throughout the domestic and foreign research on the resource utilization of engineering spoils, its overall development directio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/02
CPCC04B18/027C04B18/16C04B22/066C04B22/12C04B18/08C04B18/165
Inventor 关宇欧小凡辛晓婷
Owner SHENZHEN HUAWEI ENVIRONMENTAL PROTECTION BUILDINGMATERIAL