Sepiolite aerated concrete block and preparation process thereof

A technology of air-entrained concrete and sepiolite, applied in the field of concrete blocks, can solve the problems of insufficient strength and durability, and achieve the effects of excellent adsorption performance, increased pore volume, and small innovation space.

Active Publication Date: 2021-01-22
HUNAN INSTITUTE OF ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production of air-entrained concrete by autoclaving-free technology has unique development advantages, which not only reduces the consumption of coal energy in the production process of traditional air-entrained concrete, saves energy, but also reduces air pollution. The autoclave technology is not very mature, and the strength and durability of the product are insufficient

Method used

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  • Sepiolite aerated concrete block and preparation process thereof
  • Sepiolite aerated concrete block and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] a. The cementitious materials and additives are selected according to the weight percentage of raw materials, including 15% sepiolite, 30% slag, 20% cement (the mass ratio of Portland cement to calcium aluminate cement is 9:1), and fly ash 10% %, kaolin 10%, aluminum powder paste 0.04%, foam stabilizer 0.05%, triethanolamine 0.06%, sodium hydroxide 0.9%, lime 6%, desulfurized gypsum 5%, sodium sulfate 2%, water glass 1% (water glass Modulus 1.2), water reducer 1%, and the rest of the water; the ratio of water to material in the raw material is 0.45.

[0060] b. Mix the gelling materials and stir them at a speed of 140 ± 5 r / min for rotation and 62 ± 5 r / min for revolution, and perform dry mixing for 2 minutes to make a mixture;

[0061] c. Take water accounting for 5% of the total water weight, add aluminum powder paste, foam stabilizer and triethanolamine into water at 55°C, stir for 30s to make a suspension;

[0062] d. Dissolve water glass and sodium hydroxide into ...

Embodiment 2

[0069] The difference between this embodiment and Example 1 is that the weight percentages of raw materials are respectively 25% of sepiolite, 20% of slag, 20% of cement (the mass ratio of Portland cement to calcium aluminate cement is 9:1), pulverized coal Ash 10%, kaolin 10%, water glass 1% (water glass modulus 1.2,), lime 6%, desulfurization gypsum 5%, sodium sulfate 2%, aluminum powder paste 0.05%, foam stabilizer 0.05%, triethanolamine 0.06 %, sodium hydroxide 0.9% (aluminum powder paste, foam stabilizer, triethanolamine, the amount of sodium hydroxide is the percentage of the total amount after the material is mixed with water), water reducer 1%, and the rest of the water; raw materials The water-to-material ratio is 0.5.

[0070] The green body after demoulding is subjected to heat and humidity curing in a 60°C curing box for 28 days to obtain a finished block.

[0071] After testing, the finished blocks have a compressive strength of 5.4MPa and a dry density of 700kg / ...

Embodiment 3

[0073] The difference between this embodiment and embodiment 1 is that the weight percentage is calculated as 0.08% of the raw material aluminum powder paste,

[0074] The green body after demoulding is subjected to heat and humidity curing in a 60°C curing box for 28 days to obtain a finished block.

[0075] After testing, the finished block has a compressive strength of 4.42MPa and a dry density of 687kg / m 3 .

[0076] The results of Examples 1, 2 and 3 of the present invention prove that the present invention recycles the sepiolite micropowder, and then prepares concrete blocks by an autoclave-free method, which is easier to operate than the traditional autoclaved aerated concrete production method , lower cost, the autoclaved-free sepiolite aerated concrete block obtained by it has a porosity of more than 65% and high compressive strength, which is superior to the concrete block produced by the existing autoclaved-free process.

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Abstract

The invention discloses a sepiolite aerated concrete block which is prepared by adopting an non-autoclaved process. The concrete block comprises the following raw materials: a cementing material, an additive and water, wherein the cementing material is selected from sepiolite, slag, kaolin and cement, and the cement is a mixture of Portland cement and calcium aluminate cement. The invention also discloses a preparation method, which comprises the steps of mixing and stirring the cementing material, preparing a mixture for later use, preparing a suspension with the aluminum powder paste contentof 1-3%, preparing a sodium silicate and sodium hydroxide mixed solution, pouring the sodium silicate and sodium hydroxide mixed solution into the cementing material mixture, adding the aluminum powder paste suspension into the obtained slurry, carrying out casting molding on the obtained slurry, and curing to obtain the finished product building block. According to the sepiolite aerated concretebuilding block and the preparation process thereof, the building block with high compressive strength is prepared under the non-autoclaved condition.

Description

technical field [0001] The invention relates to the technical field of concrete blocks, in particular to a sepiolite aerated concrete block and a preparation process thereof. Background technique [0002] Aerated concrete blocks (autoclaved aerated bricks) have been developed in my country for more than 40 years. Planing and new building materials with certain earthquake resistance. In recent years, my country's wall material innovation has increased and people's understanding and further strengthening of the concept of green environmental protection has gradually restricted the application of clay bricks. Low-pollution, low-consumption aerated concrete blocks are gradually becoming a building material market. main force. In general, the process is as follows: Grind fly ash or silica sand into a slurry with water, add powdered lime, appropriate amount of cement, gypsum and foaming agent, stir and inject into the mold frame, after static oxygen foaming and curing, Cut into b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B28/06C04B111/40
CPCC04B28/06C04B2111/40C04B2201/50C04B2201/20C04B22/00C04B14/042C04B18/141C04B18/064C04B18/08C04B14/106C04B22/04C04B22/147C04B12/04C04B22/064C04B22/062C04B24/122C04B2103/48C04B2103/302C04B38/02C04B38/0067
Inventor 李小华罗伟曾智覃向阳苏欢李文菁王平
Owner HUNAN INSTITUTE OF ENGINEERING
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