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Hemihydrate gypsum aerated concrete board and preparation method thereof

A technology of aerated concrete slabs and hemihydrate gypsum, applied in the field of concrete, can solve the problems of gypsum products such as water resistance, strength decline, and variability, and achieve the effects of lowering procurement standards, improving strength, and enhancing frost resistance

Inactive Publication Date: 2018-09-28
贵州畅航装配建筑技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] China has abundant natural gypsum resources, as well as a large amount of waste gas gypsum discharged from phosphorus chemical industry, which provides abundant raw materials for the preparation of hemihydrate gypsum, and hemihydrate gypsum has fast setting and hardening, large porosity, good water resistance and plasticity. Good, good anti-activity, good expansion, etc., so it has high utilization value, it has covered the construction industry, ceramic trade, tooth materials, etc., such as Wang Peiming, Xue Lingli and others studied the effect of hemihydrate gypsum on silicon The influence of salt cement-chlorate cement mixture system on the whitening performance of facing mortar is demonstrated through experiments. Whether it is 1d curing or 7d curing, in the Portland cement-chlorate cement-hemihydrate gypsum ternary system , the content range of hemihydrate gypsum in non-whitening mortar is 25-30%. When there is no portland cement, the content range of hemihydrate gypsum is lower; another example is the development and utilization of plaster of paris and its construction products by Wang Linjiang, Wang Minliang and others. In the current situation, the application of plaster of paris mainly includes plaster of paris and its products, cement industry, gypsum board, gypsum decorative board, etc.; but the gypsum products themselves are not water-resistant, and they are volatile after being exposed to moisture, which leads to a decrease in strength; therefore, Due to its own characteristics, hemihydrate gypsum has not been fully developed and utilized.

Method used

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  • Hemihydrate gypsum aerated concrete board and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The raw material components are: 50kg of hemihydrate gypsum, 120kg of lime, 100kg of cement, 650kg of sand, 80kg of waste slurry, and 0.7kg of aluminum powder paste;

[0028] Preparation method: (1) Mix sand and waste slurry and pour them into a ball mill, add water and mix them evenly, and grind until the sieve residue through a 0.08mm square hole sieve is 22%, the water content is 40%, the specific gravity is 1.6, and the diffusivity is 38cm slurry;

[0029] (2) mixing aluminum paste powder with water to obtain aluminum powder paste;

[0030] (3) Add the slurry, cement, lime, and hemihydrate gypsum into the pouring mixing tank. After the addition, control the diffusion degree to 27 cm. After stirring for 2.5 minutes, add the aluminum powder paste in step (2), and stir for 40 seconds;

[0031] (4) pouring the mortar obtained in step (3), the pouring temperature is 43°C;

[0032] (5) After the pouring is completed, send it to the inserting position, insert the prepare...

Embodiment 2

[0036] The raw material components are: 6kg of hemihydrate gypsum, 11kg of lime, 11kg of cement, 44kg of sand, 20kg of fly ash, 8kg of waste slurry, and 0.07kg of aluminum powder paste; the preparation method is the same as in Example 1;

Embodiment 3

[0038] The raw material components are: 60kg of hemihydrate gypsum, 100kg of lime, 100kg of cement, 300kg of sand, 200kg of fly ash, 160kg of phosphorus slag, 80kg of waste in waste slurry, and 0.7kg of aluminum powder paste; the preparation method is the same as in Example 1;

[0039] In the embodiment of the present invention: the sand is silica sand with a mud content of ≤15% and a silicon dioxide content of ≥75%.

[0040] The lime is quicklime, and its effective calcium oxide content is more than or equal to 70%.

[0041] The cement is P.042.5 ordinary Portland cement.

[0042] The hemihydrate gypsum is prepared by heating raw gypsum to 150-170° C. to lose water.

[0043] The raw materials also include fly ash or phosphorus slag; the fly ash is solid waste after coal combustion in a thermal power plant; Silicon oxide 40-43%;

[0044] The finished products prepared by the schemes of Examples 1 to 3 were tested respectively, and the dry density, compressive strength, dryi...

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Abstract

The invention belongs to the technical field of concrete and particularly relates to a hemihydrate gypsum aerated concrete board and a preparation method thereof. Through the design of use amounts ofsand, cement, lime, hemihydrate gypsum and waste slurry as raw materials, the strength of the concrete board is improved, the frost resistance is improved, the water resistance is improved, the use amounts of the cement and lime are reduced simultaneously, a production cost is reduced and the various indicators satisfy the national standards.

Description

technical field [0001] The invention belongs to the technical field of concrete, in particular to a hemihydrate gypsum aerated concrete slab and a preparation method thereof. Background technique [0002] China has abundant natural gypsum resources, as well as a large amount of waste gas gypsum discharged from phosphorus chemical industry, which provides abundant raw materials for the preparation of hemihydrate gypsum, and hemihydrate gypsum has fast setting and hardening, large porosity, good water resistance and plasticity. Good, good anti-activity, good expansion, etc., so it has high utilization value, it has covered the construction industry, ceramic trade, tooth materials, etc., such as Wang Peiming, Xue Lingli and others studied the effect of hemihydrate gypsum on silicon The influence of salt cement-chlorate cement mixture system on the whitening performance of facing mortar is demonstrated through experiments. Whether it is 1d curing or 7d curing, in the Portland ce...

Claims

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Application Information

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IPC IPC(8): C04B28/14C04B38/02
CPCC04B28/145C04B2201/20C04B2201/32C04B2201/50C04B22/064C04B7/02C04B14/06C04B18/0418C04B22/04C04B38/02C04B18/145
Inventor 钟继杨步雷吴唐鹏曾强王泽松吉勇张勇徐韦洪向前勇徐雷鸣刘小成
Owner 贵州畅航装配建筑技术有限公司
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