Low-alkali liquid accelerator containing microbial polysaccharide and preparation method thereof

A technology of microbial polysaccharides and accelerators, applied in the field of concrete admixtures, can solve the problems of mechanical properties, large loss of durability, poor stability, etc.

Active Publication Date: 2020-07-07
JIANGSU SOBUTE NEW MATERIALS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the poor stability of the non-alkali liquid quick-setting agent in the prior art, and the problems that the low-alkali quick-setting agent mainly composed of aluminate and carbonate causes a large loss

Method used

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  • Low-alkali liquid accelerator containing microbial polysaccharide and preparation method thereof
  • Low-alkali liquid accelerator containing microbial polysaccharide and preparation method thereof
  • Low-alkali liquid accelerator containing microbial polysaccharide and preparation method thereof

Examples

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Embodiment 1

[0032] A preparation method of a low-alkali liquid quick-setting agent containing microbial polysaccharides, comprising the following steps:

[0033] (1) Mix 186g of water and 5g of hydrated magnesium silicate evenly, and disperse at a high speed of 3900r / min for 50min to obtain a pre-dispersed sol; heat the pre-dispersed sol to 50°C, and mix it while stirring at a speed of 1000r / min Slowly add 2g gellan gum and 2g Wenlun gum, keep warm and dissolve for 40 minutes to obtain a dispersion stabilizer containing microbial polysaccharides;

[0034] (2) Add 200g of aluminum sulfate, 20g of aluminum fluoride, 40g of calcium fluoride, and 15g of diethanolamine into the dispersion stabilizer obtained in step (1) while stirring in turn, heat up to 75°C and keep it warm for 2.5 hours; cool down to 60°C Finally, add 30g of sodium fluoride, heat the reaction for 35 minutes, and then cool to room temperature to obtain the low-alkali liquid quick-setting agent containing microbial polysaccha...

Embodiment 2

[0036] A preparation method of a low-alkali liquid quick-setting agent containing microbial polysaccharides, comprising the following steps:

[0037](1) Mix 191g of water and 4g of hydrated magnesium silicate evenly, and disperse at a high speed of 3600r / min for 35min to obtain a pre-dispersed sol; heat the pre-dispersed sol to 60°C, and mix the Slowly add 2.5g xanthan gum and 2.5g gellan gum, keep warm and dissolve for 45 minutes to obtain a dispersion stabilizer containing microbial polysaccharides;

[0038] (2) 190g of aluminum sulfate, 30g of aluminum fluoride, 30g of magnesium carbonate, and 25g of mixed alcohol amine (mixed evenly with diethanolamine and triethanolamine in a mass ratio of 1:1), and then add the dispersion stabilizer obtained in (1) while stirring , heat up to 80°C and keep warm for 3.0 hours; after cooling down to 56°C, add 25g of potassium fluoride, keep warm for 60min and then cool to room temperature to obtain a low-alkali liquid quick-setting agent c...

Embodiment 3

[0040] A preparation method of a low-alkali liquid quick-setting agent containing microbial polysaccharides, comprising the following steps:

[0041] (1) Mix 163.5g of water and 4g of magnesium aluminum silicate evenly, and disperse at a high speed of 4500r / min for 60min to obtain a pre-dispersed sol; heat the pre-dispersed sol to 45°C, and stir at a speed of 1000r / min Slowly add 2.5g Wenlun glue, keep warm and dissolve for 50 minutes to obtain a dispersion stabilizer containing microbial polysaccharides;

[0042] (2) 225g of aluminum sulfate, 20g of aluminum fluoride, 25g of magnesium carbonate, and 30g of triisopropanolamine were added to the dispersion stabilizer obtained in (1) while stirring in turn, and the temperature was raised to 85° C. and kept for 3.5 hours; the temperature was lowered to 60 After ℃, add 25g of potassium fluoride and 25g of sodium fluoride, keep it warm for 55 minutes, then cool to room temperature to obtain the low-alkali liquid quick-setting agent...

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Abstract

The invention discloses a low-alkali liquid accelerator containing microbial polysaccharide and a preparation method of the low-alkali liquid accelerator. The low-alkali liquid accelerator is preparedfrom the following components in percentage by mass: 35 to 45 percent of aluminum sulfate, 0 to 8 percent of aluminum fluoride, 4 to 8 percent of alkali metal fluoride, 5 to 8 percent of early-strength coagulant component, 2 to 6 percent of alkylol amine, 0.5 to 1.0 percent of microbial polysaccharide, 0.6 to 1.5 percent of inorganic dispersant and the balance of water, wherein the sum of the mass percentages of the components is 100 percent. The low-alkali liquid accelerator disclosed by the invention has a good accelerating effect, has less harm to later-stage mechanical properties and durability of concrete, and can improve the adaptability of the accelerator and promote early-stage strength development by being supplemented with a plurality of early-strength accelerating components; by utilizing the synergistic thickening and dispersing effects between the microbial polysaccharide organic macromolecules and the inorganic dispersing agent, the prepared low-alkali setting accelerator is good in long-term stability, the 28d layering rate is less than or equal to 1.0%, and the normal-temperature storage stability is more than or equal to 6 months.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a low-alkali liquid quick-setting agent containing microbial polysaccharides and a preparation method thereof. Background technique [0002] The emergence of accelerators shortens the setting and hardening time of concrete, and is mainly used to meet the needs of sprayed concrete construction. From the initial slope support development to the current permanent support of domestic large-scale underground projects, the construction, setting hardening, and durability of shotcrete are closely related to the hydration acceleration and strength development of the accelerator. Alkaline and powder accelerators have adverse effects such as high dust in spraying construction, strong irritation to the skin and respiratory tract of construction workers, high rebound rate of sprayed concrete, large loss of strength in the later stage, and hidden dangers of alkali-aggregate reactio...

Claims

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Application Information

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IPC IPC(8): C04B24/38C04B103/12
CPCC04B40/0039C04B2103/12C04B22/148C04B22/126C04B24/122C04B24/38C04B22/08C04B22/10
Inventor 曾鲁平王伟乔敏张小磊赵爽张茜冉千平洪锦祥
Owner JIANGSU SOBUTE NEW MATERIALS
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