Alkali-activated regenerated micro-powder foam concrete and preparation method thereof

A technology of foam concrete and recycled micropowder, which is applied in the field of building materials to achieve the effects of low cost, improved environment and high utilization rate

Active Publication Date: 2020-12-11
YANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when preparing low-density foamed concrete, the contradiction between compressive strength and dry density is particularly prominent, which has become one of the main obstacles restricting the further application of foamed concrete in filling waste pipes.

Method used

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  • Alkali-activated regenerated micro-powder foam concrete and preparation method thereof
  • Alkali-activated regenerated micro-powder foam concrete and preparation method thereof
  • Alkali-activated regenerated micro-powder foam concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] An alkali-activated regenerated micropowder foam concrete (by mass parts) contains the following components:

[0036]

[0037]

[0038] 50 parts of regenerated micropowder (obtained after the fine powder collected in the winnowing process in the waste concrete crushing process is ground to 1.8% through an 80 μm square hole sieve), 30 parts of granulated blast furnace slag powder, 20 parts of fly ash, and 3 parts of dihydrate Gypsum and 6 parts of sodium silicate (the parts by weight are calculated as sodium oxide) are uniformly mixed to prepare a premix. Then add 1 part of hydrogen peroxide (foaming agent) with a concentration of 30wt% into 30 parts of foaming water for dilution and mixing, add 0.05 part of calcium stearate (foam stabilizer) to obtain a foam, add the foam to the premix, add 20 parts of molding water, stirred slowly for 2-5 minutes, until the foam is evenly dispersed in the slurry to obtain a foamed slurry, injection molded, put into a standard cur...

Embodiment 2

[0040] An alkali-activated regenerated micropowder foam concrete (by mass parts) contains the following components:

[0041]

[0042] 70 parts of regenerated micropowder (obtained after the fine powder collected in the winnowing process in the waste concrete crushing process is ground to 1.8% through an 80 μm square hole sieve), 10 parts of granulated blast furnace slag powder, 20 parts of fly ash, and 2 parts of dihydrate Gypsum and 6 parts of sodium silicate (the parts by weight are calculated as sodium oxide) are uniformly mixed to prepare a premix. Then add 2 parts of hydrogen peroxide (foaming agent) with a concentration of 30wt% to 60 parts of foaming water for dilution and mixing, add 0.1 part of hydroxypropyl methylcellulose ether (foam stabilizer) to obtain a foam, and add the foam to the ready-mixed After feeding, add 20 parts of molding water, stir slowly for 2 minutes to 5 minutes, until the foam is evenly dispersed in the slurry, obtain a foamed slurry, injecti...

Embodiment 3

[0044] An alkali-activated regenerated micropowder foam concrete (by mass parts) contains the following components:

[0045]

[0046] 50 parts of regenerated micropowder (obtained by grinding the fine powder collected in the winnowing process in the waste concrete crushing process to 1.8% through an 80 μm square hole sieve), 30 parts of granulated blast furnace slag powder, 10 parts of fly ash, and 1 part of dihydrate Gypsum and 5 parts of sodium silicate (the parts by weight are calculated as sodium oxide) are uniformly mixed to prepare a premix. Then add 1.5 parts of plant protein foaming agent (foaming agent) to 45 parts of foaming water for dilution and mixing, after foaming by a physical foaming machine, add 0.1 part of hydroxypropyl methylcellulose ether (foam stabilizer) To obtain foam, add foam to the premix, add 20 parts of molding water, stir slowly for 2 minutes to 5 minutes, until the foam is evenly dispersed in the slurry, obtain foam slurry, injection molding,...

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Abstract

The invention discloses alkali-activated regenerated micro-powder foam concrete and a preparation method thereof.The foam concrete is prepared from, by mass, 50-70 parts of regenerated micro-powder, 10-30 parts of granulated blast-furnace slag powder, 10-20 parts of fly ash, 1-3 parts of gypsum, 50-80 parts of water, 4-8 parts of an activator, 1.0-2.0 parts of a foaming agent and 0.1-0.2 parts ofa foam stabilizer. The regenerated micro-powder is ground, the ground micro-powder is uniformly mixed with the granulated blast furnace slag powder, the fly ash and the gypsum, and excitation and foaming molding are carried out through the alkaline activator to prepare the alkali-activated foam concrete taking the regenerated micro-powder as a raw material. According to the solid waste resource utilization requirement, a large amount of fine powder collected in the air separation process in the waste concrete crushing process is utilized, and the utilization rate of the construction waste is effectively increased. Meanwhile, compared with common foam concrete, the alkali-activated foam concrete taking the regenerated micro-powder as the main raw material has the characteristics of low cost(no cement), high setting speed, high early strength, good thermal insulation property and the like.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an alkali-activated regenerated micropowder foam concrete and a preparation method thereof. Background technique [0002] With the continuous acceleration of urbanization in my country, more than 1.5 billion tons of construction waste are produced every year, but the utilization rate of construction waste in my country is less than 100 million tons, and the recycling rate of construction waste is still less than 10%. Reached 75%, Japan and South Korea reached 95%. Untreated construction waste contains more than 20 kinds of harmful substances. Stacking or landfilling will destroy vegetation, change soil structure and properties, affect microbial activities in soil, block soil biological chain, and then pollute water, soil and the atmosphere, and it is difficult to Digest. In order to effectively deal with these waste concrete and promote sustainable economi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/26C04B38/02C04B18/16C04B20/02C04B38/10
CPCC04B28/26C04B18/16C04B20/026C04B2201/20C04B2201/32C04B2201/50C04B18/141C04B18/08C04B22/143C04B22/002C04B22/068C04B2103/48C04B38/02C04B22/14C04B38/10Y02W30/91
Inventor 龚泳帆王龙会朱优倪圣峰吴正光刘聪
Owner YANGZHOU UNIV
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