Controlled-release early-strength composite material, preparation method and application thereof in cement-based material

A technology of cement-based materials and composite materials, applied in the field of slow-release and early-strength composite materials, cement-based materials, application and preparation, can solve problems such as limited adaptability, large differences in cement components, and accelerated adsorption and wrapping, etc., to achieve Improves early strength without compromising durability and promotes formation

Active Publication Date: 2022-07-01
BOTE NEW MATERIALS TAIZHOU JIANGYAN CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the above-mentioned early-strength materials will accelerate the workability of water reducers, retarders, air-entraining agents, thickeners, etc. while regulating the ion concentration and ionization rate in the cement liquid phase and the crystallization rate of hydration products. Adjust the adsorption and wrapping of products, thereby affecting the workability and durability of cement-based materials
[0007] Inorganic salt-retarder compounding measures can meet the application requirements of some cement-based material engineering, and the sleep-wake mechanism can also regulate the hydration of cement; however, the composition of cement is large and the composition of cement-based materials is complex, which increases the compounding measures Difficulty in regulation and arousal mechanism, limited adaptability

Method used

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  • Controlled-release early-strength composite material, preparation method and application thereof in cement-based material
  • Controlled-release early-strength composite material, preparation method and application thereof in cement-based material
  • Controlled-release early-strength composite material, preparation method and application thereof in cement-based material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] First, 5.0 g of calcium nitrite was prepared into a 20 wt % calcium nitrite solution as an aqueous solution of inorganic salts.

[0061] Then, a flask containing 200 g of ethanol was placed in an ultrasonic water tank, the ultrasonic dispersion was turned on, and the calcium nitrite solution was added to the flask at a speed of 5 mL / h to 10 mL / h with a peristaltic pump, and the calcium nitrite particles were prepared by the anti-solvent method. .

[0062] In the third step, 1.0 g of ammonia water was added to the flask under ultrasonic stirring, 20.0 g of tetraethyl orthosilicate was added to the flask using a dropping funnel, and ultrasonically dispersed at 20°C to 30°C. Calcium nitrate particles are used as micelle growth points, and tetraethyl orthosilicate is hydrolyzed under the action of ammonia water, and undergoes a sol-gel reaction to generate porous nano-silica.

[0063] Finally, the reaction system obtained after the dropwise addition of tetraethyl orthosili...

Embodiment 2

[0066] First, 3.0 g of sodium nitrite and 4.0 g of calcium nitrate were respectively prepared into 20 wt% sodium nitrite solution and calcium nitrate solution, and the mixed solution of the two was used as an aqueous solution of inorganic salt.

[0067] Then, a flask containing 200 g of acetone was placed in an ultrasonic water tank, the ultrasonic dispersion was turned on, and the above-mentioned sodium nitrite solution and calcium nitrate solution were added to the flask at a speed of 5 mL / h to 10 mL / h with a peristaltic pump, and the anti-solvent method was used to prepare Sodium nitrite particles and calcium nitrate particles.

[0068]In the third step, 1.0g of ammonia water and 0.5g of diethanolamine were added to the flask under ultrasonic stirring, and 10.0g of tetraethyl orthosilicate and 15.0g of tetrabutyl titanate were added to the flask using a dropping funnel. Ultrasonic dispersion at 30°C, sodium nitrite particles and calcium nitrate particles are used as micelle...

Embodiment 3

[0072] First, 4.0g of sodium nitrite, 3.0g of magnesium nitrate, 2.0g of potassium sulfate and 1.0g of lithium sulfate were prepared into 20wt% sodium nitrite solution, magnesium nitrate solution, potassium sulfate solution and lithium sulfate solution, respectively. The mixed solution is used as an aqueous solution of inorganic salts.

[0073] Then, place the flask containing the mixed organic reagent of 100g ethanol, 50g acetone and 50g tetrahydrofuran in the ultrasonic water tank, open the ultrasonic dispersion, and add the aqueous solution of the above-mentioned inorganic salt to the flask at a speed of 5mL / h~10mL / h with a peristaltic pump , using the anti-solvent method to prepare sodium nitrite particles, magnesium nitrate particles, potassium sulfate particles and lithium sulfate particles.

[0074] In the third step, 1.0g of diethanolamine and 1.0g of triethanolamine were added to the flask under ultrasonic stirring, and 15.0g of methyl orthosilicate and 15.0g of butyl...

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Abstract

The invention belongs to the technical field of building material additives, and particularly discloses a sustained-release early-strength composite material and a preparation method thereof. A method combining an anti-solvent method and a sol-gel method is designed, the problem that inorganic salt is directly dissolved when meeting water is solved through chemical coating, and the inorganic salt is coated with a porous nano packaging material, so that the purpose of sustained and controlled release is achieved, and the sustained and controlled release early strength composite material is obtained. When the early-strength composite material is applied to a cement-based material which is a cement liquid phase environment, the early-strength composite material can release inorganic salt in a cement hydration acceleration period along with the improvement of the alkalinity of the cement liquid phase, the hydration process is regulated and controlled in an ion form, the formation of hydration products is promoted, the early strength of the cement-based material is improved, and the purpose of early strength is achieved. The sustained and controlled release characteristic of the early-strength composite material ensures that the released inorganic salt does not adsorb or wrap a workability adjusting product, so that the workability and durability of a cement-based material are not influenced.

Description

technical field [0001] The invention belongs to the technical field of building material additives, and in particular relates to a slow-release and early-strength composite material, a preparation method and its application in cement-based materials. Background technique [0002] With the advancement of urbanization, my country has achieved unprecedented development in infrastructure projects such as housing construction, transportation, water conservancy, electricity, and mining, and the application of cement-based materials has ranked first in the world. Hydration of cement-based materials is a key process that determines the evolution of its strength, and hydration regulation has always been one of the key topics in the research and application of cement-based materials. It has important theoretical value and significant application benefits. For example, in the field of precast concrete components, the production characteristics of the components determine the need for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C04B28/00C04B103/10
CPCC04B40/0039C04B28/00C04B2103/10C04B2201/50C04B22/085C04B14/062C04B24/42C04B14/02C04B14/06C04B18/08C04B2103/302Y02W30/91
Inventor 赵爽乔敏王伟单广程曽鲁平陈俊松高南箫吴井志冉千平洪锦祥
Owner BOTE NEW MATERIALS TAIZHOU JIANGYAN CO LTD
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