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Calcium silicate hydrate gel solution early strength agent and preparation method thereof

A technology of hydrated calcium silicate and gel solution, applied in the direction of silicate, alkaline earth metal silicate, etc., can solve the problems of complex preparation process, poor early strength effect, difficult storage, etc. The effect of increased pressure strength and easy operation

Active Publication Date: 2015-03-11
SHANGHAI CONSTRUCTION GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a calcium silicate hydrate gel solution early strength agent and its preparation method, to solve the traditional calcium silicate hydrate powder preparation process complex, high cost, difficult to store and poor early strength effect question

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  • Calcium silicate hydrate gel solution early strength agent and preparation method thereof
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Embodiment 1

[0024] A calcium silicate hydrate (C-S-H) gel solution accelerator, its raw materials include: calcareous material, siliceous material, gel dispersant and water, wherein the molar ratio of calcium material and siliceous material is 0.3 ~3:1, the weight ratio of water to the total weight of calcareous material and siliceous material is 5~30:1, and the mass fraction of gel dispersant is 0.1%~2.0%.

[0025] Specifically, for the convenience of obtaining materials, the siliceous material is sodium silicate powder, and the calcium material is calcium nitrate crystal. Calculate sodium silicate powder, calcium nitrate crystal and The amount of water used, and accurately weighed for later use. Considering that the calcium silicate hydrate solution used as an early strength agent is in a flocculent gel state, it will precipitate and stratify under the action of water absorption and its own gravity, resulting in poor stability of the calcium silicate hydrate solution and affecting the ...

Embodiment 2

[0027] The raw material of calcium silicate hydrate gel solution early strength agent is: the molar ratio of calcium material and siliceous material is 1:1, the weight ratio of water to the total weight of calcium material and siliceous material is 8:1, The mass fraction of the gel dispersant is 0.50%. At this time, when preparing the calcium silicate hydrate gel solution, the aqueous solution of sodium silicate and the aqueous solution of calcium nitrate need to be stirred for 30 seconds respectively. Moreover, when the aqueous solution of sodium silicate reacts with the aqueous solution of calcium nitrate, it needs to be stirred for 180s. Finally, the product obtained is milky white gel liquid, which is calcium silicate hydrate gel mixed solution. At this time, the mass fraction of calcium silicate hydrate in the calcium silicate hydrate gel mixed solution is about 3.7%.

Embodiment 3

[0029] The raw material of calcium silicate hydrate gel solution early strength agent is: the molar ratio of calcareous material to siliceous material is 0.8:1, the weight ratio of water to the total weight of calcium material and siliceous material is 12:1, The mass fraction of the gel dispersant is 1.00%. At this time, when preparing the calcium silicate hydrate gel solution, the aqueous solution of sodium silicate and the aqueous solution of calcium nitrate need to be stirred for 35 seconds respectively. Moreover, when the aqueous solution of sodium silicate reacts with the aqueous solution of calcium nitrate, it needs to be stirred for 150s. Finally, the product obtained is milky white gel liquid, which is calcium silicate hydrate gel mixed solution. At this time, the mass fraction of calcium silicate hydrate in the calcium silicate hydrate gel mixed solution is about 2.6%.

[0030] In particular, in order to facilitate the description of the early-strength effect of the...

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Abstract

The invention discloses a calcium silicate hydrate gel solution early strength agent and a preparation method thereof, and relates to the technical field of construction material production. The early strength agent and the method are used for solving problems of complicated preparation process, high cost, storage difficulty, and poor early strength effect of traditional calcium silicate hydrate powder. The calcium silicate hydrate gel solution early strength agent comprises a calcareous material, a siliceous material, a gel dispersant, and water. A weight ratio of the calcareous material to the siliceous material is 0.3-3:1. A weight ratio of water to the total of the calcareous material and the siliceous material is 5-30:1. The mass percentage of the gel dispersant is 0.1-2.0%. The preparation method of the early strength agent comprises the following steps: reaction materials are weighed; a sodium silicate water solution and a calcium nitrate water solution are respectively prepared; the two are mixed and are subjected to a reaction, such that a gel mixture solution is obtained; suction filtration is carried out; and water and the dispersant are added for re-dispersion. The early strength agent is uniform and stable, and is convenient to store. The early strength agent is highly convenient to use, and has a good early strength effect. With the early strength agent, an alkali-aggregate reaction risk can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of building material production, in particular to a calcium silicate hydrate gel solution accelerator and a preparation method thereof. Background technique [0002] The early strength agent is an additive that accelerates the hydration of cement and improves the early strength of cement-based materials. Calcium silicate hydrate (C-S-H) is a common accelerator. Usually, sodium silicate and calcium nitrate are selected as siliceous materials and calcium materials, and the solution reaction method is used to prepare calcium silicate hydrate. Specifically, in the laboratory preparation process, first weigh sodium silicate and calcium nitrate according to a certain calcium-silicon ratio and water-solid ratio and add water to dissolve; then mix the dissolved sodium silicate solution and calcium nitrate solution, and simultaneously Add deionized water and react under water bath conditions; finally, after the rea...

Claims

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Application Information

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IPC IPC(8): C01B33/24
Inventor 许永和徐俊王圣怡周云史晓婉
Owner SHANGHAI CONSTRUCTION GROUP
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