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Modified aluminate cement and preparation method thereof

An aluminate cement and modification technology, applied in the field of cement, can solve the problems of not completely preventing the transformation of hydration products, reducing the early strength of aluminate cement, and not preventing the strength of cement stone from shrinking, and improving the interface transition zone. Structure, improved dynamic impact strength and strain sensitivity, effect of shortened solidification time

Active Publication Date: 2021-01-12
山东山铝环境新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the hydration products of pure aluminate cement (CAH 10 、C 2 AH 8 、C 3 AH 6 ), the structure of C-A-P-H is denser, the chemical state is more stable, and it has better resistance to CO 2 Corrosion, cement has good performance under high temperature conditions, but when it is maintained at a lower temperature (20-70°C), due to the dense C-A-P-H gel, the cement stone shrinks severely and cracks will form inside
Once cracks are formed, the strength of cement stone will decrease instead, and its phosphate content is high, which will greatly increase the cost
[0006] The article "Compressive strength development of calcium aluminate cement-GGBFSblends" uses slag to modify aluminate cement. Slag cannot completely prevent the transformation of hydration products, and cannot prevent C 3 AH 6 The formation of the cement stone can not prevent the strength shrinkage of the cement stone when the dosage is small, and at the same time, the early strength of the aluminate cement is obviously reduced.

Method used

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  • Modified aluminate cement and preparation method thereof
  • Modified aluminate cement and preparation method thereof
  • Modified aluminate cement and preparation method thereof

Examples

Experimental program
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Effect test

preparation example 1

[0037] Preparation Example 1 Titanium Silicon Micro-nano Capsules

[0038] The preparation method is as follows: add 1 g of cetyltrimethylammonium bromide to 50 mL of ethanol / THF / water mixed solution, add 5 g of ammonia water as a catalyst, and add 2 g of ethyl orthosilicate and 1 g of tetratitanate Mixed solution of butyl ester (solvent is ethanol) 10mL, continue to stir for 1h, heat to 50°C to volatilize the solvent, heat the sample to 550°C at a rate of 1°C / min, and calcinate at this temperature for 2h to prepare titanium silicon microparticles. nanocapsules. figure 1 The SEM image of the titanium-silicon micro-nanocapsule prepared for this preparation example, it can be seen from the figure that the particle size of the titanium-silicon micro-nanocapsule is about 150-200nm

[0039] The content of ethanol in the ethanol / THF / water mixed solution is 10wt%, the content of THF is 15wt%, and the balance is deionized water.

preparation example 2

[0040] Preparation Example 2 Titanium Silicon Micro-nano Capsules

[0041] The preparation method is as follows: add 1 g of cetyltrimethylammonium bromide to 50 mL of ethanol / THF / water mixed solution, add 10 g of ammonia water as a catalyst, and add 5 g of ethyl orthosilicate and 5 g of tetratitanate Mixed solution of butyl ester (solvent is ethanol) 10mL, continue to stir for 3h, heat to 70°C to volatilize the solvent, heat the sample to 600°C at a rate of 3°C / min, and calcinate at this temperature for 5h to prepare titanium silicon microparticles. nanocapsules.

[0042] The content of ethanol in the ethanol / THF / water mixed solution is 25wt%, the content of THF is 20wt%, and the balance is deionized water.

preparation example 3

[0051] Preparation Example 3 Modified Acrylic Emulsion

[0052] Prepared by:

[0053] S1. Add 0.5g of emulsifier and 1g of buffer potassium carbonate to the reactor, add 50g of deionized water, heat the reactor in a water bath, and fully stir for 0.5h to fully emulsify the emulsifier solution; the emulsifier is lost from the non-ionic emulsifier It is compounded with sorbitan monooleate and anionic emulsifier sodium stearate, the mass ratio is 3:1;

[0054] S2. Mix 10 g of methyl methacrylate, 2 g of acrylamide, 10 g of butyl acrylate and 1 g of styrene as the reaction monomer, and stir thoroughly for 0.5 h to obtain a uniform mixed monomer;

[0055] S3. 0.2g initiator sodium persulfate is dissolved in 10g deionized water to prepare initiator solution;

[0056] S4. Add the mixed monomer and initiator solution to the reaction kettle dropwise through the peristaltic pump at 2mL / min, control the dropping within 2h, stir the reaction at 65°C, and then keep the temperature for 0....

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Abstract

Provided modified aluminate cement is prepared from the following raw materials: aluminate cement, titanium-silicon micro-nano capsules, magnesium oxide, a phosphate, fly ash, modified acrylic emulsion and an activating agent, wherein the titanium-silicon micro-nano capsule is prepared from orthosilicate and titanate under the conditions of a surfactant and alkalinity. The aluminate cement prepared by the invention is wide in raw material source and simple in preparation method, has good high-temperature resistance, wear resistance, sulfate corrosion resistance, adhesion, crack resistance, freezing resistance, seepage resistance, corrosion resistance and aging resistance, also has good effects of adsorbing and degrading formaldehyde and organic pollutants due to the TiO2 structure, plays agood role in environmental protection, ensures the safety as a structural part, and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of cement, in particular to a modified aluminate cement and a preparation method thereof. Background technique [0002] Aluminate cement is a hydraulic cementitious material with calcium aluminate as the main component obtained by calcining bauxite and limestone as raw materials. Compared with aluminate cement, aluminate cement has the advantages of high early strength, high temperature resistance, wear resistance, and sulfate erosion resistance. It is used in emergency, emergency repair projects, temporary projects, and the preparation of heat-resistant concrete. However, aluminate cement is rarely used in the field of structural engineering and mass concrete, mainly because of the problem of strength shrinkage of aluminate cement. In the last century, there were many construction failures caused by the strength shrinkage of aluminate cement concrete. collapse incident. [0003] The reason for the strengt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/32C04B20/00C04B22/06C04B22/16C04B18/08C04B24/26C04B24/12C04B28/06
CPCC04B7/32C04B18/08C04B20/004C04B22/066C04B22/16C04B24/2641C04B28/06C04B40/0039C04B2111/00008C04B2201/50C04B24/128C04B24/122C04B2103/12C04B2103/302C04B2103/0068C04B14/068C04B14/02Y02W30/91
Inventor 彭珍
Owner 山东山铝环境新材料有限公司
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