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Novel nano calcium silicate hydrate polycarboxylic acid early strength agent and preparation method thereof

A technology of calcium silicate polycarboxylic acid and calcium silicate hydrate, which is applied in the field of concrete admixtures, can solve the problems affecting the early strength and later performance of concrete, particle size and dispersion stability that affect the concrete promotion effect. Reunion and other problems, to shorten the production cycle, the preparation method is simple and feasible, and the effect of improving the effect

Active Publication Date: 2022-07-29
广西科达新材料集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, calcium silicate hydrate nanoparticles are easy to agglomerate due to their high specific surface area and surface energy, and the calcium silicate hydrate crystal nuclei of nanoscale particles are prone to agglomeration due to their large specific surface area, and the particle size and dispersion are stable. properties, etc. are not guaranteed, which in turn affects the promotion of concrete, as well as the early strength and later performance of concrete

Method used

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  • Novel nano calcium silicate hydrate polycarboxylic acid early strength agent and preparation method thereof
  • Novel nano calcium silicate hydrate polycarboxylic acid early strength agent and preparation method thereof
  • Novel nano calcium silicate hydrate polycarboxylic acid early strength agent and preparation method thereof

Examples

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Embodiment 1

[0026] A preparation method of a novel early-strength agent of nano-calcium silicate hydrate polycarboxylic acid, comprising the following steps:

[0027] (1) Dissolve calcium nitrate tetrahydrate in deionized water, prepare a calcium nitrate solution with a mass percentage concentration of 40%, dissolve sodium silicate nonahydrate in deionized water, and prepare a sodium silicate solution with a mass percentage concentration of 30% , the polycarboxylate water-reducing agent is dissolved in water to make the mass fraction of the polycarboxylate water-reducing agent as 4% of the reaction bottom liquid, and the pH of the reaction bottom liquid is adjusted by sodium hydroxide to 12;

[0028] (2) the reaction bottom liquid obtained in step (1) is added to the reactor, heated to 60° C., then insulation and stirring are carried out, and the stirring speed is 600 rpm, and then calcium nitrate solution and sodium silicate solution are added dropwise simultaneously using a peristaltic p...

Embodiment 2

[0032] A preparation method of a novel early-strength agent of nano-calcium silicate hydrate polycarboxylic acid, comprising the following steps:

[0033](1) Dissolve calcium nitrate tetrahydrate in deionized water, prepare a calcium nitrate solution with a mass percentage concentration of 40%, dissolve sodium silicate nonahydrate in deionized water, and prepare a sodium silicate solution with a mass percentage concentration of 30% , the polycarboxylate water-reducing agent is dissolved in water to make the mass fraction of the polycarboxylate water-reducing agent as 4% of the reaction bottom liquid, and the pH of the reaction bottom liquid is adjusted by sodium hydroxide to 12;

[0034] (2) the reaction bottom liquid obtained in step (1) is added to the reactor, heated to 60° C., then insulation and stirring are carried out, and the stirring speed is 600 rpm, and then calcium nitrate solution and sodium silicate solution are added dropwise simultaneously using a peristaltic pu...

Embodiment 3

[0038] A preparation method of a novel early strength agent of nano calcium silicate hydrate polycarboxylate, comprising the following steps:

[0039] (1) calcium nitrate tetrahydrate is dissolved in deionized water, the preparation mass percentage concentration is 40% calcium nitrate solution, in the calcium nitrate solution, adding quality is the regulator of calcium nitrate quality 0.5%, the regulator is 1 by mass ratio : 2 polyethylene glycol and sodium cocoyl glutamate; dissolving sodium silicate nonahydrate in deionized water, preparing a sodium silicate solution with a mass percentage concentration of 30%, dissolving the polycarboxylate water reducing agent in The mass fraction of the polycarboxylate superplasticizer made in water was 4% of the reaction bottom liquid, and the pH of the reaction bottom liquid was adjusted to 12 by using sodium hydroxide; the polycarboxylate superplasticizer was the same as that in Example 2;

[0040] (2) the reaction bottom liquid obtain...

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Abstract

The invention relates to the technical field of concrete admixtures, and particularly discloses a preparation method of a novel nano calcium silicate hydrate polycarboxylic acid early strength agent, which comprises the following steps: dissolving a polycarboxylic acid water reducer in water to prepare a reaction base solution, and adjusting the pH value of the reaction base solution to 11-12.5; heating the reaction base solution to 50-70 DEG C for heat preservation, then slowly dropwise adding the calcium source aqueous solution and the silicon source aqueous solution into the reaction base solution in a heat-preservation stirring state for reaction, and after dropwise adding is completed, continuously stirring and carrying out heat-preservation reaction for 24-48 hours to obtain a nano calcium silicate hydrate suspension; and adding water-based nano cellulose into the nano calcium silicate hydrate suspension, and stirring for reaction to obtain the novel nano calcium silicate hydrate polycarboxylic acid early strength agent. According to the preparation method of the novel nano calcium silicate hydrate polycarboxylic acid early strength agent, the prepared novel nano calcium silicate hydrate polycarboxylic acid early strength agent has a strong hydration effect on a cement-based material, has an obvious coagulation accelerating effect, has a remarkable effect of improving the early strength of the cement-based material, and has no adverse effect on the later strength.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and particularly relates to a novel early strength agent of nanometer calcium silicate hydrate polycarboxylate and a preparation method thereof. Background technique [0002] In the production of concrete and its construction, as well as in the construction of various industrial and civil buildings, highways, railways and bridges, it is a constant demand to improve production efficiency and speed up construction. In the construction of these projects, a large amount of concrete needs to be used. Concrete has the advantages of low price, strong bearing capacity and high durability. However, due to the slow hydration reaction process of Portland cement and the influence of ambient temperature, the strength of concrete develops slowly. Generally, it takes more than 24 hours to reach the strength of the dismantling formwork, and the strength can only reach 40-50% of the design strength in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38C04B103/10
CPCC04B40/0039C04B2103/10C04B22/00C04B24/383C04B24/32C04B24/123C04B24/26Y02W30/91
Inventor 周武王子明刘晓陈霖罗奇峰李松涛张媛媛谢辉李国海周密梁燕飞韦露兵盘福才吴建和
Owner 广西科达新材料集团有限公司
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