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Superfine ettringite, preparation method and application of superfine ettringite to cement-based grouting material

An ultra-fine calcium and alunite technology is applied in the application, preparation, and ultra-fine ettringite field of cement-based grouting materials, and can solve the problems that there is no ultra-fine such as nano-scale ettringite synthesis method and application, etc., To achieve the effect of easy industrial production, mild synthesis conditions, and promotion of development

Active Publication Date: 2017-02-01
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the synthesis method and application of ultrafine nanoscale ettringite

Method used

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  • Superfine ettringite, preparation method and application of superfine ettringite to cement-based grouting material
  • Superfine ettringite, preparation method and application of superfine ettringite to cement-based grouting material
  • Superfine ettringite, preparation method and application of superfine ettringite to cement-based grouting material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of ultrafine ettringite: weigh Ca(NO 3 ) 2 4H 2 O 35.423g (0.15mol) and polyhydroxy acid superplasticizer 0.3073g (0.5%) are dissolved in boiled and cooled deionized water, configured into 250ml salt solution; 2 (SO 4 ) 3 18H 2 O16.661g (0.025mol) was dissolved in boiled and cooled deionized water to form a 250ml salt solution; 12.0g (0.3mol) of NaOH was weighed and dissolved in boiled and cooled deionized water to form a 250ml alkaline solution; the three solutions Quickly mix in a full-return mixed explosion nucleation reactor, react for 2 minutes, then reflux and crystallize the slurry at 50°C for 10 hours, then centrifugally wash with hot water for 8 times until the pH value is about 7, and dry in an oven at 55°C , to obtain ultrafine ettringite, denoted as AFT-1.

[0028] Mix 75 parts of anhydrite, 20 parts of quicklime, 3 parts of ettringite (with a particle size of 0.005-2.0 μm), and 2 parts of naphthalene-based water reducer to obtain white mat...

Embodiment 2

[0031] Preparation of ultrafine ettringite: weigh Ca(NO 3 ) 2 4H 2 O 35.423g (0.15mol) and water reducer 0.9219g (1.5%) are dissolved in boiled and cooled deionized water, and are configured into 250ml salt solution; weigh Al 2 (SO 4 ) 3 18H 2 O 16.661g (0.025mol) was dissolved in boiled and cooled deionized water to be configured as 250ml salt solution; 12.0g (0.3mol) of NaOH was weighed and dissolved in boiled and cooled deionized water to be configured as 250ml alkali solution; the three solutions Quickly mix in a fully back-mixed explosive nucleation reactor, circulate vigorously for 2-3 minutes, then reflux and crystallize the slurry at 50°C for 10 hours, and then centrifugally wash with hot water (8-10 times) until the pH value is about 7. Dry in an oven at 55°C. Obtained superfine ettringite, which is denoted as AFT-2.

[0032] Mix 75 parts of anhydrite, 20 parts of quicklime, 3 parts of ettringite (with a particle size of 0.005-2.0 μm), and 2 parts of naphthalen...

Embodiment 3

[0036] Preparation of ultrafine ettringite: weigh Ca(NO 3 ) 2 4H 235.423g (0.15mol) of O and 1.5365g (2.5%) of water reducing agent were dissolved in boiled and cooled deionized water to configure 250ml salt solution; 2 (SO 4 ) 3 18H 2 O 16.661g (0.025mol) was dissolved in boiled and cooled deionized water to be configured as 250ml salt solution; 12.0g (0.3mol) of NaOH was weighed and dissolved in boiled and cooled deionized water to be configured as 250ml alkali solution; the three solutions Quickly mix in a fully back-mixed explosive nucleation reactor, circulate vigorously for 2-3 minutes, then reflux and crystallize the slurry at 50°C for 10 hours, and then centrifugally wash with hot water (8-10 times) until the pH value is about 7. Dry it in an oven at 55°C to obtain ultrafine ettringite, which is designated as AFT-3.

[0037] Mix 75 parts of anhydrite, 20 parts of quicklime, 3 parts of ettringite, and 2 parts of naphthalene-based water reducer evenly to obtain whi...

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Abstract

The invention belongs to the field of building materials and particularly relates to superfine ettringite, a preparation method and application of the superfine ettringite to a cement-based grouting material. An aluminum salt solution, a calcium salt solution to which a surfactant is added, and a caustic soda solution are prepared respectively and poured into a full-backmixing explosive nucleating reactor at the same time, a nucleating reaction is carried out for 2-3 min, the materials are subjected to backflow crystallization for 2-20 h at the temperature of 20-50 DEG C, the materials are centrifugally washed to be neutral and then dried, and the superfine ettringite is obtained. According to the prepared superfine ettringite, the preparation method is simple, synthesis conditions are mild, operation is easy, good repeatability is achieved, and industrial production is easy. The superfine ettringite is applied to the cement-based grouting material, the strength of sulphate aluminium cement at all ages can be remarkably improved, especially, the early strength of the cement material can be remarkably improved, and later strength is not subjected to backward shrinkage.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to an ultrafine ettringite, a preparation method and its application in cement-based grouting materials. Background technique [0002] Grouting technology is widely used in engineering, such as settlement treatment of subway tunnel structures, grouting water blocking reinforcement in rich water sections of deep diversion tunnels, grouting reinforcement of gravel soil foundations, grouting reinforcement of surrounding rocks in subsea tunnels and broken coal Application in rock roadway anchoring and grouting reinforcement. The reason why grouting technology can play the role of reinforcement is mainly the result that the grouting material has changed from liquid phase to solid phase and then to solid body to fill the cracks of the injected body and connect the loose blocks into a whole. Cement-based grouting material is the most widely used inorganic grouting material in...

Claims

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Application Information

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IPC IPC(8): C04B14/36C04B28/14C04B111/70
CPCC04B22/14C04B28/14C04B2103/12C04B2111/70C04B2201/50C04B7/32C04B2103/302C04B22/064C04B22/002
Inventor 管学茂李海艳胡星星闫鹏举张旭阳葛鹏李宁
Owner HENAN POLYTECHNIC UNIV
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