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High-activity regenerated micro-powder and preparation method thereof

A technology of regenerated micropowder and high activity, applied in the directions of climate sustainability, sustainable waste treatment, grain treatment, etc., can solve the problems that the activity cannot meet the needs of construction, the activity of regenerated micropowder is low, and the utilization rate is low, and achieve high-efficiency activity. , enhance activity, high activity effect

Inactive Publication Date: 2021-12-14
TAIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a high-activity regenerated micropowder and its preparation method, which has the advantage of high activity, and solves the problem that the regenerated micropowder commonly produced at present has low activity, which leads to low utilization rate and partially prepared The method improves the activity of the regenerated micropowder, but its activity still cannot meet the problem of higher construction demand in actual use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: a kind of preparation method of highly active regeneration micropowder comprises the following steps:

[0029] 1) The concrete strength is measured by a universal pressure testing machine, and concrete blocks with a strength grade of C25 or more and an age of more than one year are selected, and the waste concrete blocks are initially crushed by a universal crusher, and the crushed powder is screened and separated. Small fragments with a diameter of less than 40mm are crushed again, and the powder with a particle size of no more than 40μm is selected as the initial regenerated micropowder, and the raw material of the small regenerated micropowder with a diameter of 5-40μm is continued to be pulverized by an ultra-fine airflow pulverizer, and sieved Separate the primary regenerated micropowder with a particle size not greater than 5 μm.

[0030] Use a ball mill to mill the initial regenerated micropowder for 1 hour to obtain the regenerated micropowder, add...

Embodiment 2

[0038] 1) The concrete strength is measured by a universal pressure testing machine, and concrete blocks with a strength grade of C25 or more and an age of more than one year are selected, and the waste concrete blocks are initially crushed by a universal crusher, and the crushed powder is screened and separated. Small fragments with a diameter of less than 40mm are crushed again, and the powder with a particle size of no more than 40μm is selected as the initial regenerated micropowder, and the raw material of the small regenerated micropowder with a diameter of 5-40μm is continued to be pulverized by an ultra-fine airflow pulverizer, and sieved Separate the primary regenerated micropowder with a particle size not greater than 5 μm.

[0039] Use a ball mill to mill the initial regenerated micropowder for 1.5 hours to obtain the regenerated micropowder, add a basic activator to the regenerated micropowder at a dosage of 3%, and stir and mix to increase the activity of the regen...

Embodiment 3

[0047] 1) The concrete strength is measured by a universal pressure testing machine, and concrete blocks with a strength grade of C25 or more and an age of more than one year are selected, and the waste concrete blocks are initially crushed by a universal crusher, and the crushed powder is screened and separated. Small fragments with a diameter of less than 40mm are crushed again, and the powder with a particle size of no more than 40μm is selected as the initial regenerated micropowder, and the raw material of the small regenerated micropowder with a diameter of 5-40μm is continued to be pulverized by an ultra-fine airflow pulverizer, and sieved Separate the primary regenerated micropowder with a particle size not greater than 5 μm.

[0048] Use a ball mill to mill the initial regenerated micropowder for 2 hours to obtain the regenerated micropowder, add an alkaline activator to the regenerated micropowder at a dosage of 5%, and stir and mix to increase the activity of the reg...

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Abstract

The invention relates to the technical field of regenerated micro-powder, and discloses a preparation method for high-activity regenerated micro-powder. The preparation method comprises the following steps: 1) carrying out primary crushing on waste concrete blocks by using a universal crusher, screening the crushed powder to separate small fragments with a diameter of less than 40 mm, carrying out secondary crushing, selecting powder with a particle size of not greater than 40 microns as initial regenerated micro-powder, continuously crushing small fragments, with diameters of 5-40 microns, of a regenerated micro-powder raw material by adopting an ultramicro jet mill, and screening out initial regenerated micro-powder with a particle size of not greater than 5 microns; and 2) subjecting the initial regenerated micro-powder to ball milling for 1-2 h through a ball mill so as to obtain regenerated micro-powder, doping the regenerated micro-powder with 1%-5% of an alkaline activator, and carrying out stirring and mixing to improve the activity of the regenerated micro-powder. According to the high-activity regenerated micro-powder and the preparation method thereof, the activity of the powder is improved, and the high-activity regenerated micro-powder is obtained.

Description

technical field [0001] The invention relates to the technical field of regenerated micropowder, in particular to a highly active regenerated micropowder and a preparation method thereof. Background technique [0002] With the continuous acceleration of the urbanization process, the generation and discharge of urban construction waste are increasing day by day. Urban construction waste accounts for a considerable proportion of urban solid waste. The use of open-air stacking or landfill disposal, on the one hand, occupies a large area of ​​cultivated land, on the other hand, it will have a great negative impact on vegetation, human health, and the living environment, causing damage to the ecological environment. Therefore, the safe disposal and comprehensive utilization of construction waste has been paid more and more attention. [0003] At present, the generally produced recycled micropowder has low activity, resulting in low utilization rate. Some preparation methods have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/04C04B20/02C04B18/16B02C21/00
CPCC04B20/04C04B20/026C04B20/023C04B18/167B02C21/00Y02W30/91
Inventor 曾志勇
Owner TAIZHOU UNIV