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Anhydrite agglutinate antifrost method and antifrost anhydrite agglutinate thereof

A technology of anhydrite and cementitious materials, which is applied in the field of building materials prepared from anhydrite, can solve the problems of affecting the durability and decorative effect of products, forming dirt, and restricting the application of anhydrite in building materials, so as to achieve reasonable raw material composition, prevent migration, The effect of simple method

Inactive Publication Date: 2009-04-15
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is very easy to precipitate in the form of thin layer crystals on the surface of hardened gypsum products, that is, there will be a phenomenon of frosting, which will cause dirt on the surface of the product, and even pulverization, adding K 2 Cr 2 o 7 will form a bright green color on the sample surface, Na + Ions are Na 2 SO 4 10H 2 O forms white salt frost, which seriously affects the durability and decorative effect of the product, restricting the application of anhydrite in building materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: Get 89.5% of natural anhydrite, 5.5% of composite active stimulator (calcined alunite slag+potassium salt+hemihydrate gypsum, the mutual ratio is arbitrary.), metakaolin 5%. The anhydrite used is natural anhydrite with a specific surface area of ​​6200cm 2 / g, fineness 200 mesh sieve remaining 2.4%, raw material moisture content less than 4%.

[0018] The above-mentioned raw materials can be measured and mixed under dry conditions to become the anti-return anhydrite cement.

Embodiment 2

[0019] Embodiment 2: 92% of natural anhydrite, 6% of composite active stimulator (calcined alunite mineral powder+potassium salt+hemihydrate gypsum, they are arbitrary proportioning.), silicon micropowder 2%. The anhydrite used is natural anhydrite with a specific surface area of ​​6200cm 2 / g, fineness 200 mesh sieve remaining 2.4%, raw material moisture content less than 4%.

[0020] The above-mentioned raw materials can be measured and mixed under dry conditions to become the anti-return anhydrite cementing material, and the anti-returning anhydrite cementing material can be used to manufacture anhydrite building products using the existing production process.

Embodiment 3

[0021] Embodiment 3: 89% of natural anhydrite, 6% of composite active activators (calcined alunite slag+potassium salt+hemihydrate gypsum+CuSO 4 , they are in any ratio. ), Metakaolin 5%. The anhydrite used is natural anhydrite with a specific surface area of ​​6200cm 2 / g, fineness 200 mesh sieve remaining 2.4%, raw material moisture content less than 4%.

[0022] The above-mentioned raw materials can be measured and mixed under dry conditions to become the anti-return anhydrite cement.

[0023] The physical performance indicators are shown in the table below

[0024] Example

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PUM

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Abstract

The invention is a method to prevent and cure efflorescence by karstenite cementitous material, including the steps: 1), adding compound active exciter and filling prohibiting salt efflorescence from growing in the karstenite; 2), on dry condition, gauging and mixing the above raw material to be able to make the anti-efflorescing karstenite cementitous material. Based on this, according to different usages, it can make karstenite building preparations by different existing production techniques. The anti-efflorescing karstenite cementitous material includes the components by wt%: karstenite 87-95, compound active exciter 3-8 and filling 2-5. It has reasonable raw material components, simple method and property of preventing and curing efflorescence phenomenon.

Description

technical field [0001] The invention belongs to the field of preparing building materials from anhydrite, in particular to a method for preventing frost return of anhydrite cement and its product. Background technique [0002] my country's anhydrite resources are very rich, the reserves account for 2 / 3 of the total gypsum, and the proven reserves are 31.6 billion tons. Except for the mining of anhydrite deposits in Nanjing, Shaodong, Taiyuan, Xingning, and Chongqing, most anhydrite is sleeping underground, and the utilization rate of resources is low. Anhydrite has the potential hydration activity of reacting with water to form dihydrate gypsum, which is the chemical basis for the use of anhydrite as a building material, but block anhydrite hardly hydrates, and the hydration rate of finely ground anhydrite is also very slow , Poor coagulation ability, no early strength. It has only been used as a cement retarder for many years. In the existing anhydrite application techno...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/05C04B28/14C04B22/00
Inventor 杨新亚王锦华牟善彬
Owner WUHAN UNIV OF TECH