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Magnesium-doped calcium silicate crystal nucleus early strength agent with long-term stability and preparation method thereof

A calcium silicate and stability technology, applied in the field of magnesium-doped calcium silicate crystal nucleus early strength agent and preparation, can solve the problems of instability, easy agglomeration, unfavorable storage and use, etc. The performance is unstable, the effect of improving the promotion effect

Active Publication Date: 2021-06-18
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]Currently, this calcium silicate hydrate crystal nucleus early strength agent has not been widely used in China. Agglomeration is prone to occur, resulting in instability that is not conducive to storage and use

Method used

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  • Magnesium-doped calcium silicate crystal nucleus early strength agent with long-term stability and preparation method thereof
  • Magnesium-doped calcium silicate crystal nucleus early strength agent with long-term stability and preparation method thereof
  • Magnesium-doped calcium silicate crystal nucleus early strength agent with long-term stability and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Weigh 17.2g of polycarboxylate superplasticizer and 100.0g of water, add them into the reaction kettle and start stirring, and set the stirring rate to 200rpm. Take by weighing 4.0g magnesium nitrate hexahydrate, 12.5g calcium nitrate tetrahydrate and 56.8g water are mixed and be configured into the mixed aqueous solution that effective concentration is 15wt%; Take by weighing 20.0g sodium metasilicate nonahydrate and 43.0g water are configured into effective concentration is 20wt% silicate aqueous solution, and finally weighed 2.4g of 30.0wt% nitric acid aqueous solution. Drop the above mixed aqueous solution, silicate aqueous solution and nitric acid aqueous solution into the reaction kettle, and control the dropping rate so that the dropping time is 3.0h. strong agent.

Embodiment 2

[0048] Weigh 15.0 g of polycarboxylate superplasticizer and 140.0 g of water, add them into the reaction kettle and start stirring, and set the stirring rate to 300 rpm. Take by weighing 3.0g magnesium nitrate hexahydrate, 10.4g calcium nitrate tetrahydrate and 22.6g water are mixed and be configured into the mixed aqueous solution that effective concentration is 25wt%; Take by weighing 8.5g sodium metasilicate pentahydrate and 23.5g water are configured into effective concentration is 15wt% silicate aqueous solution, and finally weighed 1.5g of 55.0wt% nitric acid aqueous solution. Drop the above mixed aqueous solution, silicate aqueous solution and nitric acid aqueous solution into the reaction kettle, and control the dropping rate so that the dropping time is 2.5 hours. strong agent.

Embodiment 3

[0050] Weigh 5.6g of polycarboxylate superplasticizer and 80.0g of water, add them into the reaction kettle and start stirring, and set the stirring rate to 250rpm. Weigh 0.5g magnesium nitrate hexahydrate, 3.8g calcium nitrate tetrahydrate and 34.6g water to mix and configure an effective concentration of 7.5wt% mixed aqueous solution; weigh 5.8g nonahydrate sodium metasilicate and 18.6g water to configure an effective concentration 10 wt% silicate aqueous solution, and finally weigh 1.0 g of 50.0 wt% nitric acid aqueous solution. Drop the above mixed aqueous solution, silicate aqueous solution and nitric acid aqueous solution into the reaction kettle, and control the dropping rate so that the dropping time is 2.0h. strong agent.

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Abstract

The invention discloses a magnesium-doped calcium silicate crystal nucleus early strength agent with long-term stability and a preparation method of the magnesium-doped calcium silicate crystal nucleus early strength agent. The magnesium-doped calcium silicate crystal nucleus early strength agent is prepared from the following components in parts by mass: 0.1-5 parts of acid liquor; 1-20 parts of a dispersant; 0.2 to 5 parts of soluble magnesium salt; 3 to 30 parts of soluble calcium salt; and 3-30 parts of soluble silicate. Magnesium ions easily enter the structure of the silicate polymer and react to generate a hydrated magnesium silicate gel network, and the gel network increases steric hindrance and can prevent mutual aggregation of crystal nucleus particles, so that the effect of stabilizing the crystal nucleus particles is achieved, and the crystal nucleus suspension is kept stable for a long time. Meanwhile, after magnesium ions are doped, unreacted dispersing agent molecules can be complexed, so that the reaction rate of the dispersing agent is increased, the specific surface area of the nanocrystal nucleus is also increased, the cement hydration promoting effect of the nanocrystal nucleus is improved, and the early strength of cement is improved.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, in particular to a magnesium-doped calcium silicate crystal nucleus early strength agent with long-term stability and a preparation method. Background technique [0002] At present, the country is vigorously promoting prefabricated buildings. Prefabricated buildings have the advantages of high efficiency, high precision and high quality, and are more energy-saving and environmentally friendly. However, it also puts forward higher requirements for the production of prefabricated components. How to improve the early strength of prefabricated components and reduce the steam curing time, thereby shortening the demoulding cycle and reducing energy consumption, has become an urgent problem to be solved. [0003] Traditional early strength agents are usually added in the production of prefabricated components, and steam curing is performed on prefabricated components to improve their early strength. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/24C04B22/08
CPCC04B40/0046C04B22/00C04B2103/302
Inventor 胡传林朱宏伟邹府兵王发洲张迈刘蒸蒸
Owner WUHAN UNIV OF TECH
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