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Method for preparing sulphoaluminate cement-based slurry injecting material using nano C-S-H gel

A technology of sulphoaluminate cement, C-S-H, applied in the direction of gel preparation, chemical instruments and methods, colloid chemistry, etc., can solve the problem that the compressive strength cannot meet the requirements, achieve low cost, improve early strength, and good effect Effect

Inactive Publication Date: 2018-11-30
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The C-S-H gel nano-slurry prepared by the present invention is applied in sulphoaluminate cement-based materials, which can significantly improve the compressive strength of cement under the condition of large water-cement ratio, and solve the problem of existing sulphoaluminate cement in large water-cement ratio. The problem that the compressive strength cannot meet the requirements under specific conditions

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  • Method for preparing sulphoaluminate cement-based slurry injecting material using nano C-S-H gel
  • Method for preparing sulphoaluminate cement-based slurry injecting material using nano C-S-H gel
  • Method for preparing sulphoaluminate cement-based slurry injecting material using nano C-S-H gel

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preparation example Construction

[0030] The specific embodiment of the present invention provides a kind of preparation method of nanometer C-S-H gel material, and this preparation method comprises the following steps:

[0031] 1) Preparation of solutions: according to the set calcium-silicon ratio, use solvents to prepare silicate solution, calcium salt solution and alkali solution respectively;

[0032] Preferably, the solvent is water or an organic solvent.

[0033] Further preferably, the organic solvent used is one of ethanol, isopropanol, butanol, acetone, ethanol aqueous solution, isopropyl ketone aqueous solution, butanol aqueous solution and acetone aqueous solution.

[0034] In another specific embodiment, the solvent is deionized water. When preparing silicate solution, dissolve sodium metasilicate in deionized water to form silicate solution; when preparing calcium salt solution, dissolve calcium nitrate in deionized water to form calcium salt solution; when preparing alkali solution, dissolve sodi...

Embodiment 1

[0053] The preparation process of the nano C-S-H gel slurry of the present embodiment is as follows:

[0054] Weigh 101.95g Na according to the initial calcium-silicon ratio of 0.6 2 SiO 3 After stirring and dissolving in deionized water, set the volume to a 500mL volumetric flask to obtain a 1.67mol / L sodium metasilicate solution; weigh 118.075g Ca(NO 3 ) 2 4H 2 O was stirred and dissolved in deionized water, and then settled in a 500mL volumetric flask to obtain a 1mol / L calcium nitrate solution; after weighing 10g of NaOH and stirred and dissolved in deionized water, it was settled in a 500mL volumetric flask to obtain a 0.5mol / L solution. L of sodium hydroxide solution. Mix the three solutions quickly in a fully back-mixed explosive nucleation reactor, react for 3 minutes, then pour the slurry into a flask, react in a heating mantle at 60°C for 2 hours, and then rinse repeatedly with deionized water to remove unreacted Na + and NO 3 - , until the pH value is about ...

Embodiment 2

[0058] The preparation process of the nano C-S-H gel slurry of the present embodiment is as follows:

[0059] Weigh 76.313g Na according to the initial calcium-silicon ratio of 0.8 2 SiO 3 After stirring and dissolving in deionized water, set the volume to a 500mL volumetric flask to obtain a 1.25mol / L sodium metasilicate solution; weigh 118.075g Ca(NO 3 ) 2 4H 2 O was stirred and dissolved in deionized water, and then settled in a 500mL volumetric flask to obtain a 1mol / L calcium nitrate solution; after weighing 10g of NaOH and stirred and dissolved in deionized water, it was settled in a 500mL volumetric flask to obtain a 0.5mol / L solution. L of sodium hydroxide solution. Mix the three solutions quickly in a fully back-mixed explosive nucleation reactor, react for 3 minutes, then pour the slurry into a flask, react in a heating mantle at 60°C for 2 hours, and then rinse repeatedly with deionized water to remove unreacted Na + and NO 3 - , until the pH value is about ...

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Abstract

The present invention provides a method for preparing a sulphoaluminate cement-based slurry injecting material using nano C-S-H gel. The preparation method of the nano C-S-H gel comprises the following steps: a silicate solution, a calcium salt solution and an alkali solution are respectively prepared using a solvent according to a given calcium-silicate ratio; then the prepared three solutions are pumped into a full back-mixing explosive-type nucleation reactor at the same speed for rapid reaction for 2-3 min to obtain mixed slurry liquid; the mixed slurry liquid is transferred to a reactionkettle to react at 50-80 DEG C for 5 min-11,520 min; after the reaction is completed, the mixed slurry liquid is centrifuged and washed to neutrality to prepare the nano-C-S-H gel; and the nano-C-S-Hgel is used as an additive in the cement-based material. Starting from the simple raw materials and crystallization time, the nano C-S-H gel is simply, efficiently and economically synthesized and used as the additive to be added in the cement-based material, has advantages of being simple in operation, mild in reaction conditions, environmentally friendly, etc., and is suitable for large-scale preparation.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a method for preparing sulphoaluminate cement-based grouting material by utilizing nanometer C-S-H gel. Background technique [0002] The mineral composition of sulfoaluminate cement clinker mainly includes anhydrous calcium sulfoaluminate (C 4 A 3 S), dicalcium silicate (β-C 2 S), tetracalcium aluminoferrite (C 4 AF) and other minerals. Sulphoaluminate cement has many excellent properties, such as low temperature hydration performance and good corrosion resistance. When cement-based materials are used for repair and reinforcement, the water-cement ratio ranges from 0.5 to 1.5. Under the condition of large water-cement ratio, the compressive strength of sulphoaluminate cement-based materials cannot meet the requirements. [0003] In recent years, more and more scholars have applied nanostructured materials to the construction field to improve performance such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14C04B28/06B01J13/00C04B103/12
CPCC04B22/142B01J13/0056C04B28/06C04B2103/12
Inventor 李海艳张莉管学茂尹璐明袁梦雅李明宝张子豪
Owner HENAN POLYTECHNIC UNIV