High-strength sulphoaluminate cement and preparation method thereof

A sulfoaluminate cement, high-strength technology, applied in the field of building materials, can solve problems such as the reduction of cement strength, and achieve the effects of improving the strength in the later stage, promoting stable growth, and regulating the setting time of cement

Inactive Publication Date: 2018-09-18
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At home and abroad, there have been studies on improving the early strength of sulphoaluminate cement by adding early strength agents, but it will lead to a decrease in the later strength of cement.

Method used

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  • High-strength sulphoaluminate cement and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of high-strength sulfoaluminate cement, each component by weight percentage is:

[0019] Sulphoaluminate cement clinker: 76%, silica fume: 9%, dihydrate gypsum: 10%, reinforcing component: 4.5%, retarder: 0.5%; wherein, the reinforcing component is composed of 1% carbonic acid Lithium, 2% calcium hydroxide and 1.5% aluminum sulfate, that is, lithium carbonate, calcium hydroxide, and aluminum sulfate account for 1%, 2%, and 1.5% by weight of high-strength sulfoaluminate cement, respectively. Weigh the raw materials of each component according to the above-mentioned predetermined mass percentage, mix them evenly and grind them together until the fineness is 360m2 2 / kg, made into cement products. According to the national standard GB / T1346-2011 "Cement Standard Consistency Water Consumption, Setting Time, Stability Test Method", GB / T17671-1999 "Cement Strength Test Method" to test the setting time of cement and the strength of mortar specimens, the cement was dete...

Embodiment 2

[0021] A kind of high-strength sulfoaluminate cement, each component by weight percentage is:

[0022] Sulphoaluminate cement clinker: 80%, silica fume: 5%, dihydrate gypsum: 12%, reinforcing component: 2.3%, retarder: 0.7%; wherein, the reinforcing component is composed of 0.5% carbonic acid Lithium, 1% calcium hydroxide and 0.8% aluminum sulfate, that is, lithium carbonate, calcium hydroxide and aluminum sulfate account for 0.5%, 1% and 0.8% by weight of high-strength sulfoaluminate cement respectively. Weigh the raw materials of each component according to the above-mentioned predetermined mass percentage, mix them uniformly and grind them together until the specific surface area is 378m 2 / kg, made into cement products. According to the national standard GB / T1346-2011 "Cement Standard Consistency Water Consumption, Setting Time, Stability Test Method", GB / T17671-1999 "Cement Strength Test Method" to test the setting time of cement and the strength of mortar specimens, the...

Embodiment 3

[0024] A kind of high-strength sulfoaluminate cement, each component by weight percentage is:

[0025] Sulphoaluminate cement clinker: 84%, silica fume: 5%, dihydrate gypsum: 7%, reinforcing component: 3.2%, retarder: 0.8%; wherein, the reinforcing component is composed of 1% carbonic acid Lithium, 2% calcium hydroxide and 1.2% aluminum sulfate, that is, lithium carbonate, calcium hydroxide, and aluminum sulfate account for 1, 2%, and 1.2% by weight of high-strength sulfoaluminate cement, respectively. Weigh the raw materials of each component according to the above-mentioned predetermined mass percentage, mix them uniformly and grind them together until the specific surface area is 385m 2 / kg, made into cement products. According to the national standard GB / T1346-2011 "Cement Standard Consistency Water Consumption, Setting Time, Stability Test Method", GB / T17671-1999 "Cement Strength Test Method" to test the setting time of cement and the strength of mortar specimens, the ce...

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Abstract

The invention relates to high-strength sulphoaluminate cement and a preparation method thereof. The high-strength sulphoaluminate cement contains the following components by weight percent: 75-85% ofsulphoaluminate cement clinker, 5-10% of silica fume, 5-15% of gypsum, 0.5-5% of reinforcing components, and 0-1% of a retarder. In the mineral composition of the sulphoaluminate cement clinker, the content of calcium sulphoaluminate is greater than 60%. In the silica fume, the content of SiO2 is greater than 85%. Dihydrate gypsum or natural anhydrite is adopted as the gypsum. The reinforcing component is prepared from lithium carbonate, calcium hydroxide and aluminum sulfate, wherein the weight percentages of lithium carbonate, calcium hydroxide and aluminum sulfate in the high-strength sulphoaluminate cement are respectively 0.2-1%, 0.3-2% and 0-2%. The retarder is industrial borax or boric acid. According to the invention, the setting time of the sulphoaluminate cement can be effectively adjusted, so as to meet the construction requirement of actual engineering; the sulphoaluminate cement is remarkably improved in both early-stage and long-term strength, and has the advantages of freezing resistance, and impermeability and erosion resistance, and the application scope of the sulphoaluminate cement is expanded.

Description

technical field [0001] The invention relates to a high-strength sulphoaluminate cement and a preparation method thereof, belonging to the field of building materials. Background technique [0002] Sulphoaluminate cement is a clinker composed of anhydrous calcium sulphoaluminate and dicalcium silicate as the main minerals, which is calcined at low temperature (1300-1350°C) with limestone, bauxite and gypsum as raw materials. , a hydraulic cementitious material made by grinding together with an appropriate amount of gypsum and admixture materials. Due to the high hydration activity of calcium sulfoaluminate minerals, a large amount of ettringite (AFt) and alumina gel (AH) can be formed in the early stage. 3 ), therefore, sulfoaluminate cement has excellent characteristics such as rapid hardening, early strength, and good durability, and is widely used in winter construction, prefabricated components, GRC products, anti-seepage plugging, emergency repairs, anti-seawater corros...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/32C04B7/36C04B22/14
CPCC04B7/323C04B7/36C04B40/0039C04B22/10C04B22/064C04B22/148
Inventor 沈燕张伟陈玺李雪飘
Owner YANGZHOU UNIV
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