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Method for reinforcing cement-based material through steel slag-based in-situ growth of hydrated calcium silicate

A technology of calcium silicate hydrate and in-situ growth, which is applied in the field of building material reinforcement, can solve the problems of poor effect of modification and reinforcement of cement-based materials, difficulty in dispersing nanometer calcium silicate hydrate, and reducing the cementing activity of steel slag, etc. Achieve the effect of promoting strength development, enhancing and enhancing modification effect, and fine particle size

Active Publication Date: 2022-04-12
江苏镇江建筑科学研究院集团股份有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004]In summary, the existing nano-calcium silicate hydrate is difficult to disperse, easy to agglomerate, the effect of modified reinforced cement-based materials is not good, and the existing in-situ growth Calcium silicate hydrate preparation technology will reduce the gelling activity of steel slag

Method used

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  • Method for reinforcing cement-based material through steel slag-based in-situ growth of hydrated calcium silicate
  • Method for reinforcing cement-based material through steel slag-based in-situ growth of hydrated calcium silicate
  • Method for reinforcing cement-based material through steel slag-based in-situ growth of hydrated calcium silicate

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Embodiment 1

[0030] A method for in-situ growth of steel slag-based calcium silicate hydrate reinforced cement-based materials, comprising the following steps:

[0031] (1) Mixing: According to the number of parts by mass, weigh 100 parts of steel slag powder with a particle size of less than 75 μm, 3.52 parts of calcium acetate monohydrate, 4.24 parts of sodium metasilicate pentahydrate and 2 parts of polycarboxylate superplasticizer. It is mixed evenly in a mixer, and then placed in a ball mill at a speed of 150 rpm for 10 minutes to obtain dry steel slag;

[0032] (2) Chemical co-precipitation reaction: Weigh 400 parts of water in parts by mass and place it in the stirring pot, add the dry steel slag material obtained in step (1) into it while stirring, and stir for 10 minutes to obtain the steel slag-based in-situ growth hydration calcium silicate;

[0033] (3) Stirring: Stir the steel slag base obtained in the step (2) to grow calcium silicate hydrate in situ, add 900 parts of P.II52...

Embodiment 2

[0035] A method for in-situ growth of steel slag-based calcium silicate hydrate reinforced cement-based materials, comprising the following steps:

[0036] (1) Mixing: According to the number of parts by mass, weigh 100 parts of steel slag powder with a particle size of less than 75 μm, 7.05 parts of calcium acetate monohydrate, 8.48 parts of sodium metasilicate pentahydrate and 2 parts of polycarboxylate high-efficiency water reducer. It is mixed evenly in a mixer, and then placed in a ball mill at a speed of 250 rpm for 30 minutes to obtain dry steel slag;

[0037] (2) Chemical co-precipitation reaction: Weigh 400 parts of water in parts by mass and place it in the stirring pot, add the dry steel slag material obtained in step (1) into it while stirring, and stir for 10 minutes to obtain the steel slag-based in-situ growth hydration calcium silicate;

[0038] (3) Stirring: Stir the steel slag base obtained in the step (2) to grow calcium silicate hydrate in situ, add 900 pa...

Embodiment 3

[0040] A method for in-situ growth of steel slag-based calcium silicate hydrate reinforced cement-based materials, comprising the following steps:

[0041] (1) Mixing: by mass parts, weigh 100 parts of steel slag powder with a particle size less than 75 μm, 10.56 parts of calcium acetate monohydrate, 12.72 parts of sodium metasilicate pentahydrate and 2 parts of polycarboxylate superplasticizer. It is mixed evenly in a mixer, and then placed in a ball mill at a speed of 200 rpm for 20 minutes to obtain dry steel slag;

[0042](2) Chemical co-precipitation reaction: Weigh 400 parts of water in parts by mass and place it in the stirring pot, add the dry steel slag material obtained in step (1) into it while stirring, and stir for 20 minutes to obtain the steel slag-based in-situ growth hydration calcium silicate;

[0043] (3) Stirring: Stir the steel slag base obtained in the step (2) to grow calcium silicate hydrate in situ, add 900 parts of P.II52.5 Portland cement to it, and...

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Abstract

The invention discloses a method for reinforcing a cement-based material by steel slag-based in-situ growth of hydrated calcium silicate, which comprises the following steps: (1) weighing steel slag powder, a calcium source, a silicon source and a dispersing agent in parts by weight, mixing, and carrying out ball milling to obtain a steel slag dry material; (2) weighing water in parts by weight, adding the dry steel slag into the water, and stirring to obtain steel slag-based in-situ growth hydrated calcium silicate; and (3) adding a cementing material into the steel slag-based in-situ growth hydrated calcium silicate, and stirring to obtain the cement-based material. According to the invention, the steel slag and chemical raw materials are subjected to dry mixing, then calcium silicate hydrate is subjected to in-situ growth through chemical coprecipitation reaction, and finally the cement-based material is prepared by mixing, so that on the premise of not influencing the gelling activity of the steel slag, the in-situ growth of calcium silicate hydrate on a steel slag matrix is realized, the dispersion effect of calcium silicate hydrate is improved, and the agglomeration of calcium silicate hydrate is reduced; the enhanced modification effect on the cement-based material is improved.

Description

technical field [0001] The invention relates to a method for strengthening building materials, in particular to a method for in-situ growth of steel slag-based calcium silicate hydrate reinforced cement-based materials. Background technique [0002] In recent years, nanomaterials are often used to modify and strengthen cement-based materials. Among them, nano-calcium silicate hydrate (C-S-H) can be used as a crystal nucleus early strength agent due to its acceleration of cement hydration, so as to promote the strength development of cement-based materials and improve the durability of cement-based materials. However, because of its large specific surface area and high specific surface energy, it is easy to agglomerate into large particles, which limits its crystal nucleus effect and affects its modification and enhancement effect on cement-based materials. Therefore, it is necessary to reduce its agglomeration and improve its dispersibility during the preparation and use of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/19C04B7/26C04B7/153C04B7/38C04B7/36
CPCY02P40/10Y02W30/91
Inventor 潘钢华周飞飞蒙海宁陆小军
Owner 江苏镇江建筑科学研究院集团股份有限公司
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