Non-autoclaved aerated concrete containing bauxite tailings and preparation method thereof

An air-entrained concrete and bauxite technology, applied in the field of building materials, can solve the problems of low silica content, high alumina content, and the inability to use air-entrained concrete, etc., achieving high strength, good thermal insulation performance, and far-reaching environmental protection significance and the effect of social benefits

Active Publication Date: 2018-08-14
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

Method used

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  • Non-autoclaved aerated concrete containing bauxite tailings and preparation method thereof
  • Non-autoclaved aerated concrete containing bauxite tailings and preparation method thereof
  • Non-autoclaved aerated concrete containing bauxite tailings and preparation method thereof

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0031] Example 1

[0032] In this embodiment, the non-autoclaved aerated concrete containing bauxite tailings is composed of the following raw materials 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, 0 parts of additives.

[0034] The preparation method is as follows: first, stir bauxite tailings powder, fly ash, lime, gypsum, cement, and water in a container for 5 minutes; secondly, add aluminum powder paste to the obtained slurry and continue stirring for 3 minutes; Once again, pour the evenly stirred slurry into the mold, and pre-curing for 3 hours at 65°C and 100% relative humidity; finally, after the pre-curing, demould and cut the sample, and put it in the steam curing The room is steamed and cured at 100°C for 20 hours, and it is obtained after cooling.

[0035] The specific strength of the non-autoclaved aerated concrete obtained in thi...

Example Embodiment

[0037] Example 2

[0038] In this embodiment, the non-autoclaved aerated concrete containing bauxite tailings is composed of the following raw materials 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, 1 part of water glass, Mix 1 part of naphthalene water reducer.

[0040] The preparation method is as follows: firstly, mix bauxite tailings, fly ash, lime, gypsum, cement, and water in a container for 3 minutes; secondly, add aluminum powder paste and additives to the slurry and continue to mix for 2 minutes ; Again, pour the evenly stirred slurry into the mold, pre-curing for 4 hours at 60°C and 100% relative humidity; finally, after the pre-curing, demould and cut the sample, and put it in the steam In the cultivation room, steam it at 90°C for 22 hours, and it will be obtained after cooling.

[0041] The specific streng...

Example Embodiment

[0043] Example 3

[0044] In this embodiment, the non-autoclaved aerated concrete containing bauxite tailings is composed of the following raw materials 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 admixtures, 1 part of liquid caustic soda, naphthalene Mixed with 1 part of water reducing agent.

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

[0047] The specific ...

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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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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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