Method for reinforcing alpha hemihydrate gypsum hydrated hardenite by employing organic complex additive agent

A technology of hemihydrate gypsum and additives, applied in the application field of inorganic materials, can solve problems such as research gaps and performance defects, and achieve the effects of fine and clean appearance, moderate final setting time, good leveling and water resistance.

Inactive Publication Date: 2008-12-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compound modification can bring multiple effects or achieve superimposed effects, which is an important development direction of additive technology at present, but domestic related research is almost blank
[0004] Commonly used high-efficiency water...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Based on the total mass of α hemihydrate gypsum and additives, prepare additives in the following mass percentages:

[0021] Naphthalene superplasticizer (FDN) 0.03%

[0022] Melamine superplasticizer (SM) 0.61%

[0023] Polycarboxylate superplasticizer (PC) 0.22%

[0024] Polyether defoamer 0.05%

[0025] Dry mix the additive and α hemihydrate gypsum powder evenly, and fully mix with water according to the water-to-paste ratio of 0.30. After hydration and hardening, the basic properties of the product are: initial setting time 15min, final setting time 20min, 2h wet flexural strength of gypsum hardened body 10.7MPa, 2h wet compressive strength 28.1MPa; absolute dry flexural strength 16.6MPa, absolute dry flexural strength The compressive strength is 67.4MPa.

Embodiment 2

[0027] Based on the total mass of α hemihydrate gypsum and additives, prepare additives in the following mass percentages:

[0028] Naphthalene superplasticizer (FDN) 0.37%

[0029] Melamine superplasticizer (SM) 1.30%

[0030] Polycarboxylate superplasticizer (PC) 0.12%

[0031] Degassing defoamer 0.04%

[0032] Dry mix the additive and α hemihydrate gypsum powder evenly, and fully mix with water according to the water-to-paste ratio of 0.28. After hydration and hardening, the basic properties of the product are: initial setting time 20min, final setting time 29min, 2h wet flexural strength of gypsum hardened body 8.0MPa, 2h wet compressive strength 20.2MPa; absolute dry flexural strength 20.3MPa, absolute dry flexural strength The compressive strength is 75.8MPa.

Embodiment 3

[0034] Based on the total mass of α hemihydrate gypsum and additives, prepare additives in the following mass percentages:

[0035] Naphthalene superplasticizer (FDN) 2.30%

[0036] Melamine superplasticizer (SM) 0.06%

[0037] Polycarboxylate superplasticizer (PC) 0.11%

[0038] Silicone defoamer 0.28%

[0039] Dry mix the additive and α hemihydrate gypsum powder evenly, and fully mix with water according to the water-to-paste ratio of 0.26. After hydration and hardening, the basic properties of the product are: initial setting time 13min, final setting time 21min, 2h wet flexural strength of gypsum hardened body 11.0MPa, 2h wet compressive strength 26.6MPa; absolute dry flexural strength 23.3MPa, absolute dry flexural strength The compressive strength is 80.3MPa.

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Abstract

The invention discloses a method which adopts an organic compound additive to reinforce an alpha-semi-hydrated gypsum hydration hardened body. Calculated by the total mass of alpha-semi-hydrated gypsum and an additive, the additive is prepared according to the following percentage by mass: 0.01 to 3.0 percent of high efficient naphthalene water reducing agent (FDN), 0.01 to 3.0 percent of high efficient melamine water reducing agent (SM), 0.01 to 3.0 percent of high efficient polycarboxylic acid water reducing agent (PC) and 0 to 1.3 percent of antifoaming agent. The additive and an alpha-semi-hydrated gypsum raw material or a powder grinding material undergo even dry mix and then are fully mixed with an amount of water inside mixing equipment; and mixed gypsum undergoes condensation and hardening according to product requirements. The 2h wet rupture strength of modified gypsum is increased by 20 to 60 percent, while 2h wet compressive strength is increased by 30 to 100 percent; meanwhile, the absolute dry rupture strength of the modified gypsum is increased by 35 to 70 percent, while the absolute dry compressive strength is increased by 30 to 100 percent; moreover, the method has appropriate condensation time, fine and clean appearance and excellent leveling property and water resistance.

Description

technical field [0001] The invention belongs to the technical field of application of inorganic materials, and specifically relates to an additive compound formula for improving the strength of α hemihydrate gypsum hydration hardened body with high-efficiency water reducer as the main component and its application method. Background technique [0002] Gypsum is a building material with a long history of application, and it is listed as the three pillars of inorganic cementitious materials together with lime and cement. It has the advantages of light weight, fast condensation, good fire resistance, low heat and sound transfer, efficient construction, and harmless to the human body. It is an energy-saving green material that is respected and developed internationally. The application of gypsum materials is usually through the hydration and hardening of hemihydrate gypsum to obtain dihydrate gypsum products. There are two forms of hemihydrate gypsum, α and β. Among them, α hem...

Claims

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Application Information

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IPC IPC(8): C04B24/24C04B24/12
CPCC04B28/146C04B2111/27
Inventor 官宝红吴忠标张佳莉叶青青刘越
Owner ZHEJIANG UNIV
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