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Recycled micro powder activation method

A technology of regenerated micropowder and activation method, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of environmental and personal safety hazards, immature research, deterioration of natural environment, etc., and achieve the goal of weakening the environment Influence and promote the development of circular economy and the effect of improving work performance

Active Publication Date: 2016-12-07
WUHAN YUANJING READY MIXED CONCRETE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most construction wastes are disposed of in traditional ways, which not only occupy a large amount of land, but also cause great harm to the environment and personal safety.
In addition, mass production of concrete requires massive mining of high-quality natural sand and gravel resources, resulting in serious deterioration of the natural environment
There have been many studies on processing construction waste into recycled aggregates to replace natural sand and gravel to produce concrete, but processing construction waste into concrete with a specific surface area greater than 400m 2 / kg of ultrafine powder to replace cement or as an admixture to prepare concrete is not mature enough

Method used

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Effect test

Embodiment 1

[0022] A method for regenerating micropowder activation, said activation method comprising the following steps:

[0023] 1) Crushing: crushing construction waste into 30mm particles;

[0024] 2) Pretreatment: calcining the obtained particles at 400°C for 3 hours;

[0025] 3) Ball milling: Ball mill the pretreated construction waste particles for 4 hours to obtain construction waste powder with a size of 30 μm to 80 μm;

[0026] 4) Calcination: place it at 600°C for 3 hours, heat up to 900°C for 1 hour, keep warm for 3 hours, and cool to room temperature for 1 hour to obtain regenerated micropowder;

[0027] 5) Mixing: The regenerated micropowder and its 1% by weight activator are fully mixed evenly, sealed and stored, and the activated regenerated micropowder can be obtained.

Embodiment 2

[0029] A method for regenerating micropowder activation, said activation method comprising the following steps:

[0030] 1) Crushing: crushing construction waste into 40mm particles;

[0031] 2) Pretreatment: calcining the obtained particles at 500°C for 4 hours;

[0032] 3) Ball milling: Ball mill the pretreated construction waste particles for 4 hours to obtain construction waste powder with a size of 30 μm to 80 μm;

[0033] 4) Calcination: place it at 600°C for 4 hours, heat up to 800°C for 1.5 hours, keep it warm for 3 hours, and cool to room temperature for 1.5 hours to obtain regenerated micropowder;

[0034] 5) Mixing: The regenerated micropowder and its 2% by weight activator are fully mixed evenly, sealed and stored, and the activated regenerated micropowder can be obtained.

Embodiment 3

[0036] A method for regenerating micropowder activation, said activation method comprising the following steps:

[0037] 1) Crushing: crushing construction waste into 25mm particles;

[0038] 2) Pretreatment: calcining the obtained particles at 300°C for 3 hours;

[0039] 3) Ball milling: mill the pretreated construction waste particles for 3 hours to obtain construction waste powder with a size of 30 μm to 80 μm;

[0040] 4) Calcination: place it at 700°C for 2h, heat up to 1000°C for 0.5h, keep warm for 1h, and cool to room temperature for 0.5h to obtain regenerated micropowder;

[0041] 5) Mixing: Fully mix the regenerated micropowder with 0.1% by weight of the activator, and store it in a sealed container to obtain the activated regenerated micropowder.

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Abstract

The invention discloses a recycled micro powder activation method, which comprises the following steps of crushing construction waste into particles being 25 to 40mm; then, putting the particles under the conditions of 200 to 500 DEG C for calcination for 1 to 4h; then, performing ball milling for 2 to 5h; performing sieving to obtain construction waste powder being 30 mum to 80 mum; putting the construction waste powder at 600 to 700 DEG C to perform calcination for 2 to 4h; raising the temperature to 0.5h to 1.5h to 800 to 1000 DEG C; performing heat insulation for 1 to 3h; then, after 0.5 to 1.5h, lowering the temperature to room temperature; then, sufficiently and uniformly mixing the recycled micro powder and an excitant with the weight percentage being 0.1 to 2..2 percent to obtain the activated recycled micro powder. The activation method provided by the invention has the characteristics that the activation effect is good; the operation of the activation method is simple; the environment is protected. Compared with ordinary concrete, the recycled micro powder concrete prepared from the recycled micro powder treated by the method provided by the invention has the advantage that the pressure resistant intensity and the work performance are obviously improved.

Description

technical field [0001] The invention relates to the technical field of solid waste utilization, in particular to a method for activating regenerated micropowder. Background technique [0002] With the continuous increase in the scale of urban reconstruction and expansion in my country and the rapid advancement of the construction of a new socialist countryside, the demolition of a large number of old buildings and structures has produced a large amount of construction waste such as concrete, bricks, stones, mortar and tiles. According to the estimate of the Ministry of Housing and Urban-Rural Development, by 2020, China will build 30 billion square meters of new housing, and the resulting construction waste will reach at least 5 billion tons. At present, most construction wastes are disposed of in traditional ways, which not only occupy a large amount of land, but also cause great harm to the environment and personal safety. In addition, mass production of concrete requires...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/04C04B20/02C04B18/16C04B28/00
CPCC04B18/167C04B20/023C04B20/026C04B20/04C04B28/00C04B2201/50C04B14/02C04B14/06C04B2103/302C04B22/002Y02W30/91
Inventor 何志斌张双艳
Owner WUHAN YUANJING READY MIXED CONCRETE CO LTD
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