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A non-autoclaved aerated concrete containing bauxite tailings and its preparation method

A technology of aerated concrete and bauxite, which is applied in the field of building materials, can solve the problems of low silicon oxide content, high alumina content, and cannot use aerated concrete, etc., and achieves high strength, good thermal insulation performance, and far-reaching environmental protection significance. and social benefits

Active Publication Date: 2021-03-19
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the deficiencies in the above-mentioned prior art, in order to effectively overcome the problem that bauxite tailings cannot be used in aerated concrete due to high alumina content and low silicon oxide content, and to provide a method for using bauxite tailings Method for preparing non-autoclaved air-entrained concrete

Method used

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  • A non-autoclaved aerated concrete containing bauxite tailings and its preparation method
  • A non-autoclaved aerated concrete containing bauxite tailings and its preparation method
  • A non-autoclaved aerated concrete containing bauxite tailings and its preparation method

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Effect test

Embodiment 1

[0032] In this embodiment, the non-autoclaved aerated concrete containing bauxite tailings consists of the following raw materials in parts by weight:

[0033] 10 parts of bauxite tailings powder, 50 parts of fly ash, 16 parts of lime, 8 parts of gypsum, 16 parts of cement, 63 parts of water, 0.1 part of aluminum powder paste, and 0 part of admixture.

[0034] The preparation method is as follows: firstly, stirring bauxite tailings powder, fly ash, lime, gypsum, cement and water in a container for 5 minutes; secondly, adding aluminum powder paste to the obtained slurry and continuing stirring for 3 minutes; Again, pour the evenly stirred slurry into the mold, and pre-cure for 3 hours at 65°C and a relative humidity of 100%; finally, after the pre-curing, demould, cut, and steam-cure the sample Room, under the condition of 100 ℃ steam for 20 hours, after cooling.

[0035] The specific strength of the non-autoclaved air-entrained concrete obtained in this example is 5.9×10 3 ...

Embodiment 2

[0038] In this embodiment, the non-autoclaved aerated concrete containing bauxite tailings consists of the following raw materials in parts by weight:

[0039] 20 parts of bauxite tailings powder, 30 parts of fly ash, 18 parts of lime, 12 parts of gypsum, 20 parts of cement, 65 parts of water, 0.12 parts of aluminum powder paste, 1 part of admixture, the admixture is 1 part of water glass, It is made by mixing 1 part of naphthalene-based water reducer.

[0040] The preparation method is as follows: first, stir bauxite tailings, fly ash, lime, gypsum, cement, and water in a container for 3 minutes; secondly, add aluminum powder paste and admixture to the slurry and continue stirring for 2 minutes ; Again, pour the evenly stirred slurry into the mold, and pre-cure for 4 hours at 60 ° C and a relative humidity of 100%; finally, after the pre-curing is completed, demould the sample, cut it, and put it in a steamer. In the growing room, it is steamed for 22 hours under the conditi...

Embodiment 3

[0044] In this embodiment, the non-autoclaved aerated concrete containing bauxite tailings consists of the following raw materials in parts by weight:

[0045] 30 parts of bauxite tailings, 30 parts of fly ash, 22 parts of lime, 8 parts of gypsum, 10 parts of cement, 60 parts of water, 0.14 parts of aluminum powder paste, 2 parts of admixture, the admixture is 1 part of liquid caustic soda, naphthalene It is made by mixing 1 part of superplasticizer.

[0046] The preparation method is as follows: first, stir raw materials such as bauxite tailings, fly ash, lime, gypsum, cement and water in a container for 5 minutes; secondly, add aluminum powder paste and admixture to the slurry and continue stirring 3 minutes; again, pour the evenly stirred slurry into the mold, and perform pre-curing for 4 hours at 50°C and a relative humidity of 95%; finally, after the pre-curing, demould and cut the sample, Put it into a steaming room, steam it for 24 hours under the condition of 80°C, and ...

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Abstract

The invention provides non-autoclaved aerated concrete containing bauxite tailings and a preparation method thereof. The non-autoclaved aerated concrete is prepared by taking bauxite tailing powder, fly ash, lime, gypsum, cement, water, aluminum powder paste and an additive as raw materials. The preparation method comprises the following steps: converting non-active minerals into high-activity aluminum oxide and silicon oxide by adopting the high-temperature-treated bauxite tailings; then generating a new product by aluminum oxide and silicon oxide under a non-autoclaved condition, wherein thenew product can exist stably so that the specific strength of the aerated concrete is improved. The invention provides a novel bauxite tailing comprehensive utilization manner; recycling of industrial solid wastes can be realized so that the non-autoclaved aerated concrete has profound environment protection meaning and social benefits.

Description

technical field [0001] The invention belongs to the field of building materials, and relates to a non-autoclaved aerated concrete and a preparation method thereof, in particular to an aerated concrete manufactured from bauxite-containing tailings and a preparation method thereof. Background technique [0002] Air-entrained concrete is an ideal wall material to replace traditional solid clay bricks. It has the advantages of heat preservation, sound insulation, light weight, earthquake resistance, environmental protection and quick construction. It has been strongly supported by national wall reform policies, tax policies and environmental protection policies for many years. , has broad market development prospects. Traditional air-entrained concrete is made of silicon and calcium materials as the main raw materials, mixed with air-generating agent, and made of lightweight porous silicon through batching, stirring, pouring, pre-curing, cutting, autoclaving, curing and other pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B40/02
CPCC04B28/04C04B40/024C04B2201/50C04B22/064C04B18/08C04B18/12C04B22/143C04B22/04C04B12/04C04B2103/302
Inventor 勾密峰张海波张爱霞管学茂张超凡张学航阮文强
Owner HENAN POLYTECHNIC UNIV
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