Coupling agent modified nano hydrated calcium silicate crystal nucleus early strength agent and preparation method thereof

A technology of calcium silicate hydrate and coupling agent, which is applied in the field of concrete early strength agent, can solve the problems of large CSH crystal nucleus particle size, easily broken charge balance, and reduced effective surface area, etc., and achieves high electrostatic repulsion and space potential. resistance, is conducive to performance, and optimizes the effect of particle gradation

Inactive Publication Date: 2021-05-25
JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The above technology utilizes the dispersant to adsorb on the surface of C-S-H crystal nucleus by ion complexation on the surface of C-S-H crystal nucleus, realizing the nano-dispersion of C-S-H crystal nucleus, but because the charge balance is easily broken, the particle size of CSH crystal nucleus is large, the effective surface area is reduced, and low The early strength effect is not obvious when the dosage is mixed

Method used

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  • Coupling agent modified nano hydrated calcium silicate crystal nucleus early strength agent and preparation method thereof

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preparation example Construction

[0020] A preparation method of the coupling agent-modified nano-calcium silicate hydrate crystal nucleus accelerator, comprising the following steps: Step S01: adding a dispersant and a coupling agent to the container, and then adding ionized water to the prepared Half of the quality of the early strength agent, and the dispersant, coupling agent, and ionized water are placed in a water bath and stirred to prepare the base material; step S02: adding the soluble calcium source aqueous solution dropwise to the base material prepared in step S01 at the same time and soluble silicon source aqueous solution, after the dropwise addition, keep warm; step S03: add ionic water to the bottom material to the quality of the early strength agent to be prepared, and obtain the coupling agent modified nano-calcium silicate hydrate crystal nucleus early strength agent .

[0021] In step S01, the stirring rate is 300-1600 rpm.

[0022] In step S01, the temperature of the water bath is 25-85°C...

Embodiment 1

[0027] The preparation steps are as follows:

[0028] (1) Place 25 parts of polycarboxylic acid dispersant and 2.5 parts of 3-aminopropyltrimethoxysilane coupling agent in a 3-necked flask with a stirring device, then make up 500 parts of deionized water, and place the three-necked flask The bottle is equipped with a stirring device, and placed in a water bath, the temperature of the water bath is controlled at 35°C, and the stirring rate is controlled at 800rpm;

[0029] (2) 20 parts of calcium nitrate tetrahydrate are mixed with 100 parts of aqueous solution of 20% mass concentration, and 30 parts of sodium metasilicate pentahydrate are mixed with 150 parts of aqueous solution of 20% mass concentration;

[0030](3) the calcium nitrate tetrahydrate aqueous solution of step (2) and the sodium metasilicate pentahydrate aqueous solution are added dropwise to the base material of step (1) simultaneously, and the time for adding is 5h, and the insulation is 1h, and the temperature...

Embodiment 2

[0033] The preparation steps are as follows:

[0034] (1) Put 25 parts of polycarboxylic acid dispersant and 2.5 parts of 3-glycidyl etheroxypropyl trimethoxysilane coupling agent in a 3-neck flask with a stirring device, and then add deionized water to 500 parts , put the three-necked flask with a stirring device, and place it in a water bath, control the temperature of the water bath at 45°C, and control the stirring rate at 800rpm;

[0035] (2) 20 parts of calcium acetate are mixed with 100 parts of aqueous solution of 20% mass concentration, and 30 parts of sodium metasilicate pentahydrate are mixed with 150 parts of aqueous solution of 20% mass concentration;

[0036] (3) The calcium acetate aqueous solution of step (2) and the sodium metasilicate pentahydrate aqueous solution are added dropwise to the base material of step (1) simultaneously, and the dropwise addition time is 4h, and the insulation is 2h, and the dropwise addition temperature and the insulation temperatu...

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Abstract

The invention discloses a coupling agent modified nano hydrated calcium silicate crystal nucleus early strength agent and a preparation method. The coupling agent modified nano hydrated calcium silicate crystal nucleus early strength agent comprises the following components in percentage by mass: 1-10% of dispersing agent, 0.05-1% of coupling agent, 5-30% of hydrated CSH synthesized from a soluble calcium source and a soluble silicon source through solution precipitation, adn the balance of deionized water. The molar ratio of calcium to silicon is 0.5-2.0. The preparation method comprises the following steps of taking an aqueous solution of a polycarboxylic acid dispersing agent and a silane coupling agent as a base material, and simultaneously dropwise adding a soluble calcium source aqueous solution and a soluble silicon source aqueous solution into the base material to obtain the nano calcium silicate hydrate crystal nucleus early strength agent. The coupling agent modified nano hydrated calcium silicate crystal nucleus early strength agent can quickly promote cement hydration and shorten the setting time, the hour strength of concrete is greatly improved, and the middle and later strength is slightly improved. The method is suitable for different rubber material systems and different temperature conditions.

Description

technical field [0001] The invention relates to a concrete early-strength agent, in particular to a coupling agent-modified nano-calcium silicate hydrate crystal nucleus early-strength agent and a preparation method thereof. Background technique [0002] With the continuous development of infrastructure construction, natural resources are becoming more and more scarce, especially concrete raw materials are on the verge of depletion. In order to improve the reuse rate of concrete structures, prefabricated components and prefabricated buildings will continue to ban on-site pouring of concrete. Prefabricated components and prefabricated components have been in short supply, so new requirements are put forward for prefabricated components, which need to have higher early strength, so as to shorten the prefabrication cycle, increase mold turnover, and reduce maintenance energy consumption. [0003] Hydrated nano-calcium silicate crystal nuclei are pre-hydrated cement hydration pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C04B103/10
CPCC04B40/0039C04B2103/10C04B24/42C04B22/085C04B22/00C04B24/28C04B24/04C04B22/16
Inventor 王学川钱珊珊卢通赵旭彭荩影屈浩杰于鹏程郑春扬
Owner JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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