Nanogel polymerized aluminum type liquid alkali-free accelerator and preparation method thereof

A technology of nano-gel and polymerized aluminum, which is applied in the field of concrete admixtures, can solve the problems of low early strength, safe use of fluorine-containing toxic substances, etc., and achieve the effect of improving stability, long-term stability, and early strength of cement

Active Publication Date: 2020-04-07
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the low concentration of aluminum phase in the non-alkali liquid quick-setting agent in the prior art, the low early strength of the existing liquid non-alkali quick-setting agent and

Method used

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  • Nanogel polymerized aluminum type liquid alkali-free accelerator and preparation method thereof
  • Nanogel polymerized aluminum type liquid alkali-free accelerator and preparation method thereof
  • Nanogel polymerized aluminum type liquid alkali-free accelerator and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A preparation method of nano-gel polymerized aluminum type liquid alkali-free quick-setting agent, comprising the following steps:

[0031] (1) Add calcium oxide, white carbon black and water into a glass beaker with a calcium-silicon molar ratio of 1.8 and a water-solid ratio of 24 and stir thoroughly for 8 minutes, then perform ultrasonic dispersion for 5 minutes and then transfer the reaction materials to the reactor; according to the reaction temperature The hydrothermal synthesis reaction was carried out at 150°C and the reaction time was 8 hours. Finally, the reactant was centrifuged, filtered, washed three times with deionized water and absolute ethanol, and dried in a vacuum oven at 60°C to obtain nanogel;

[0032] (2) Mix 175g of aluminum carbonate, 30g of nanogel, 15g of diethanolamine and 147.5g of water evenly, stir while heating to 55°C, keep the temperature for 2.0h and let it stand for 0.5h to obtain the initial reactant; mix 130g of aluminum sulfate Add ...

Embodiment 2

[0034] A preparation method of nano-gel polymerized aluminum type liquid alkali-free quick-setting agent, comprising the following steps:

[0035] (1) Add calcium oxide, diatomaceous earth and water into a glass beaker with a calcium-silicon molar ratio of 1.5 and a water-solid ratio of 18 and stir thoroughly for 6 minutes, then ultrasonically disperse for 4 minutes and then transfer the reaction materials to the reactor; according to the reaction temperature The hydrothermal synthesis reaction was carried out at 120°C and the reaction time was 12 hours. Finally, the reactants were centrifuged, filtered, washed twice with deionized water and absolute ethanol, and dried in a vacuum oven at 60°C to obtain nanogels;

[0036] (2) 150g of aluminum carbonate, 40g of nanogel, 20g of triethanolamine and 137g of water were mixed evenly, stirred while heating to 50°C, and left to stand for 0.5h after the insulation reaction for 1.5h to obtain the initial reactant; 150g of aluminum sulfat...

Embodiment 3

[0038] A preparation method of nano-gel polymerized aluminum type liquid alkali-free quick-setting agent, comprising the following steps:

[0039] (1) Add calcium oxide, diatomaceous earth and water into a glass beaker with a calcium-silicon molar ratio of 1.2 and a water-solid ratio of 15 and stir thoroughly for 10 minutes, then ultrasonically disperse for 3 minutes and then transfer the reaction materials to the reactor; according to the reaction temperature The hydrothermal synthesis reaction was carried out at 180°C and the reaction time was 6h. Finally, the reactants were centrifuged, filtered, washed twice with deionized water and absolute ethanol, and dried in a vacuum oven at 60°C to obtain nanogels;

[0040] (2) Mix 175g of aluminum carbonate, 35g of nanogel, 30g of triisopropanolamine and 161g of water evenly, stir while heating to 60°C, keep the temperature for 1.5h and let it stand for 0.5h to obtain the initial reactant; Aluminum sulfate and 4g of polyacrylamide w...

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Abstract

The invention discloses a nanogel polymerized aluminum type liquid alkali-free accelerator and a preparation method thereof. The nanogel polymerized aluminum type liquid alkali-free setting accelerator is prepared from, by mass, 20-30% of aluminum sulfate, 25-35% of aluminum carbonate, 5-8% of a nanogel, 3-7% of alkylol amine, 0.2-0.8% of an amide organic stabilizer, and the balance of water, andthe nanogel is a hydrothermally synthesized nano-hydrated calcium silicate gel. The alkali-free liquid accelerator adopts the aluminum sulfate and the aluminum carbonate as main aluminum phase components, and the formation of polyaluminum sulfate is realized by utilizing the double hydrolysis effect of the aluminum carbonate and remarkably reducing the dosage of the aluminum sulfate, so that the aluminum phase ion concentration of an alkali-free system is improved. The nano-hydrated calcium silicate gel can rapidly promote tricalcium silicate hydration, harmlessly improves the early strength of cement, and cooperates with an amide organic stabilizer to improve the long-term stability of the product.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a nano-gel polymerized aluminum type liquid alkali-free accelerator and a preparation method thereof. Background technique [0002] Shotcrete refers to the use of a certain amount of compressed air to spray fresh concrete mixed in proportion from the nozzle, and mix it with a liquid accelerator at the nozzle to spray it on the surface to be sprayed or to repair the structural surface. Among them, the emergence of the core material accelerator can significantly shorten the setting and hardening time of shotcrete, and realize the initial support of underground projects such as tunnels and hydropower stations. Focusing on the reduction of concrete strength in the later period caused by traditional alkali accelerators, the hidden dangers of alkali-aggregate reaction, and the corrosion effect on construction workers, the mainstream research and development ideas for accele...

Claims

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Application Information

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IPC IPC(8): C04B24/26C04B24/12C04B103/12
CPCC04B40/0039C04B2103/12C04B22/148C04B22/10C04B22/08C04B24/122C04B24/2652C04B24/124Y02W30/91
Inventor 洪锦祥曾鲁平王伟张小磊赵爽乔敏冉千平王方刚
Owner JIANGSU SOBUTE NEW MATERIALS
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