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Alpha high-strength gypsum based self-leveling material prepared by adopting phosphogypsum and production process thereof

A production process, high-strength gypsum technology, applied in the field of building materials, to achieve the effect of increasing strength, improving physical properties, and improving fluidity

Inactive Publication Date: 2013-09-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no patent in China for preparing α-high-strength gypsum-based self-leveling materials with phosphogypsum

Method used

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  • Alpha high-strength gypsum based self-leveling material prepared by adopting phosphogypsum and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The production process of using phosphogypsum to prepare α-high-strength gypsum-based self-leveling materials, the proportion of each component is as follows:

[0019] 1) Prepare α high-strength gypsum powder from phosphogypsum:

[0020] Modified phosphogypsum: 60%; water: 29.6%; calcium chloride: 10%; tartaric acid: 0.4%;

[0021] Put the raw materials into the reaction kettle according to the above ratio, stir and mix to make a slurry, heat up to 95°C, then keep it warm for 5 hours, and carry out hydrothermal reaction under normal pressure, so that the dihydrate gypsum is dehydrated and transformed into α high-strength gypsum; ℃ hot water washing, solid-liquid separation, to obtain α high-strength gypsum slurry, and quickly dry at 100 ℃ to obtain α high-strength gypsum powder;

[0022] 2) Use α high-strength gypsum powder to prepare gypsum-based self-leveling materials:

[0023] α high-strength gypsum powder: 60%; fine river sand: 30.45%; sulfoaluminate cement: 3%; ...

Embodiment 2

[0026] The production process of using phosphogypsum to prepare α-high-strength gypsum-based self-leveling materials, the proportion of each component is as follows:

[0027] 1) α high-strength gypsum powder made from phosphogypsum: (Adjust the following marked data at the upper and lower limits, marked in blue)

[0028] Modified phosphogypsum: 50%; water: 39.5%; calcium chloride: 10%; tartaric acid: 0.5%;

[0029] Put the raw materials into the reaction kettle according to the above ratio, stir and mix to make a slurry, heat up to 98°C, then keep it warm for 4 hours, and carry out hydrothermal reaction under normal pressure to dehydrate the dihydrate gypsum into α high-strength gypsum; After washing with hot water at ℃ and separating the solid and liquid, the α-high-strength gypsum slurry is obtained, and quickly dried at 95°C to obtain the α-high-strength gypsum powder;

[0030] 2) Use α high-strength gypsum powder to prepare gypsum-based self-leveling materials:

[0031]α...

Embodiment 3

[0034] The production process of using phosphogypsum to prepare α-high-strength gypsum-based self-leveling materials, the proportion of each component is as follows:

[0035] 1) Prepare α high-strength gypsum powder from phosphogypsum:

[0036] Modified phosphogypsum: 40%; water: 44.8%; calcium chloride: 15%; tartaric acid: 0.2%;

[0037] Put the raw materials into the reaction kettle according to the above ratio, stir and mix to make a slurry, heat up to 92°C, then keep it warm for 6 hours, and carry out hydrothermal reaction under normal pressure to dehydrate the dihydrate gypsum into α high-strength gypsum; ℃ hot water washing, solid-liquid separation, to obtain α-high-strength gypsum slurry, and quickly dry at 92°C to obtain α-high-strength gypsum powder;

[0038] 2) Use α high-strength gypsum powder to prepare gypsum-based self-leveling materials:

[0039] α high-strength gypsum powder: 50%; fine river sand: 38.95%; sulphoaluminate cement: 4%; fly ash: 4%; redispersible...

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Abstract

The invention relates to an alpha high-strength gypsum based self-leveling material prepared by adopting phosphogypsum and a production process thereof. The material comprises the following components in percentage by weight: 40-60% of alpha high-strength gypsum powder, 30-50% of aggregates, 1-4% of cement, 1-4% of fly ash, 2-4% of re-dispersible rubber powder, 0.1-0.3% of retarder, 0.2-0.75% of water reducing agent, 0.1-0.25% of water-retaining agent, 0.1-0.4% of air entraining agent and 0.05-0.15% of antifoaming agent. The production process comprises the steps of uniformly mixing the components and obtaining the alpha high-strength gypsum based self-leveling material. The alpha high-strength gypsum based self-leveling material disclosed by the invention has the advantages that the requirements of JC / T1023-2007 Gypsum based Self-leveling Mortar are met and the requirements on the 30min fluidity loss, the initial setting time, the final setting time, the breaking strength, the compressive strength and the shrinking rate are met.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an alpha high-strength gypsum-based self-leveling material prepared from phosphogypsum and a production process thereof. Background technique [0002] Phosphogypsum is a precipitate mainly composed of calcium sulfate dihydrate discharged from the production process of wet-process phosphoric acid, and is the most important industrial by-product in the production of phosphorus chemical industry. Normally, the production of 1 ton of P 2 o 5 It is necessary to discharge 4.5 to 5.5 tons of phosphogypsum. The pH value of phosphogypsum is acidic, and its main component is calcium sulfate dihydrate, but it contains certain impurities such as phosphorus, fluorine, and organic matter. The chemical composition is complex, and it has not been well utilized at present. In recent years, with the continuous development of the phosphating industry, the discharge of phos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14
Inventor 马保国卢斯文茹晓红郅真真李玉博蹇守卫
Owner WUHAN UNIV OF TECH
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