Powder alkali-free accelerator as well as preparation method, use method and application thereof

A technology of quick-setting agent and powder, which is applied in the field of building materials, can solve the problems of uneven concrete quality, affecting the durability of concrete, and difficult control of water-cement ratio, so as to shorten the initial and final setting time, superior quick-setting effect, and production low cost effect

Pending Publication Date: 2021-08-17
SHANXI SUNWAY INTION TRADE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it has poor water solubility and cannot be constructed by wet spraying process. It is only suitable for dry spraying method. However, dry spraying method has problems such as large rebound, poor working environment, difficult control of water-cement ratio, and uneven concrete quality. The alkali powder quick-setting agent uses sodium metaaluminate and / or sodium fluoride in large quantities, and its alkali content has far exceeded 1%. There is still the risk of alkali-aggregate reaction with the active aggregate in concrete, which will affect the quality of concrete. Durability

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  • Powder alkali-free accelerator as well as preparation method, use method and application thereof
  • Powder alkali-free accelerator as well as preparation method, use method and application thereof

Examples

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Effect test

Embodiment 1

[0040] A powder alkali-free accelerator, 750 parts by weight of industrial aluminum sulfate, 40 parts by weight of magnesium fluorosilicate, 30 parts by weight of 3000 mesh zeolite powder, 70 parts by weight of diethanolamine, 15 parts by weight of triisopropanolamine, heptahydrate 65 parts by weight of magnesium sulfate, 20 parts by weight of aqueous organic bentonite, and 10 parts by weight of heavy magnesium oxide.

[0041] The preparation method of embodiment 1 powder alkali-free quick-setting agent comprises the steps:

[0042] (1) Add zeolite powder into the vertical double-helix conical mixer, slowly inject diethanolamine and triethanolamine solutions into the feeding port, and the feeding time is 30 minutes; then mix and stir the two materials for 30 minutes;

[0043] (2) Put aluminum sulfate, magnesium fluorosilicate, early strengthening agent, stabilizer and neutralizing agent into the mixer, mix and stir for 45 minutes, so that all materials are mixed evenly, and th...

Embodiment 2

[0046]A powder alkali-free accelerator, 800 parts by weight of industrial aluminum sulfate, 50 parts by weight of magnesium fluorosilicate, 20 parts by weight of 5000 mesh zeolite powder, 60 parts by weight of diethanolamine, 35 parts by weight of anhydrous magnesium sulfate, magnesium silicate 20 parts by weight of aluminum and 15 parts by weight of magnesium hydroxide. The preparation method is the same as in Example 1. A powder-free alkali-free setting accelerator is obtained. No water is added during the preparation process, and the water content is not more than 2wt%.

[0047] The method of using the powder non-alkali quick-setting agent: stir and dissolve the obtained powder non-alkali quick-setting agent and water according to the mass ratio of 650:350, and the code is AF-02.

Embodiment 3

[0049] A powder alkali-free accelerator, 780 parts by weight of industrial aluminum sulfate, 35 parts by weight of magnesium fluorosilicate, 30 parts by weight of 5000 mesh zeolite powder, 90 parts by weight of diethanolamine, 40 parts by weight of anhydrous magnesium sulfate, magnesium silicate 25 parts by weight of aluminum. The preparation method is the same as in Example 1. A powder-free alkali-free setting accelerator is obtained. No water is added during the preparation process, and the water content is not more than 2wt%.

[0050] The method of using the powder non-alkali quick-setting agent: stir and dissolve the obtained powder non-alkali quick-setting agent and water according to the mass ratio of 600:400, and the code is AF-03.

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Abstract

The invention discloses a powder alkali-free accelerator as well as a preparation method, a use method and application thereof. The powder alkali-free accelerator comprises the following raw materials: aluminum sulfate, magnesium fluosilicate, an adsorbent, alkylol amine, an early strength agent, a stabilizer and an optional neutralizer, and the water content of the powder alkali-free accelerator is not greater than 2wt%. The powder alkali-free accelerator can reduce the storage and transportation cost in a severe environment and a long-distance transportation process, is convenient to use and has a good effect, and the liquid alkali-free accelerator prepared by mixing and dissolving the powder alkali-free accelerator and water has the characteristics of low mixing amount, high setting speed, high retention rate of early strength and later strength and the like.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a powder alkali-free accelerator and its preparation method, use method and application. Background technique [0002] With the development of national infrastructure construction, shotcrete is more and more widely used in tunnels, bridges and other projects. Accelerators with rapid setting and hardening characteristics have become one of the indispensable admixtures for modern shotcrete. Although the traditional alkaline quick-setting agent can meet the construction requirements of sprayed concrete quick-setting, but because of its high alkali content and strong corrosiveness, it will have an adverse effect on the later strength and durability of concrete. Compared with alkali accelerators, liquid alkali-free accelerators represented by aluminum sulfate are gradually replacing alkali-free accelerators due to their high long-term strength retention, no alka...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/40C04B103/12
CPCC04B40/0039C04B2103/12C04B22/148C04B22/126C04B22/08C04B24/122C04B22/142C04B24/40C04B22/066
Inventor 马雪英徐忠洲王宏维
Owner SHANXI SUNWAY INTION TRADE CO LTD
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