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Alkali-free liquid setting accelerator

A technology of quick-setting agent and liquid, which is applied in shaft lining, tunnel lining, underground chamber, etc. It can solve the problems of loss of mechanical properties, concrete cracking, etc., and achieves no irritating smell, no alkali metal ions, good storage stability sexual effect

Active Publication Date: 2010-02-17
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, concrete will form secondary ettringite in an environment with high sulfate content, and the expansion stress will cause the concrete to crack or even completely lose its mechanical properties

Method used

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  • Alkali-free liquid setting accelerator

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0024] Prepare raw materials according to the following weight ratio (%):

[0025] Amorphous aluminum hydroxide 15

[0026] Formic acid 10

[0027] Oxalic acid 8

[0028] Phosphoric acid (85%) 5

[0029] Diethanolamine 5

[0030] Polyether defoamer 0.1

[0031] water 56.9

[0032] Dissolve the hydroxycarboxylic acid in water first and stir rapidly, then add aluminum hydroxide at a temperature of 75°C and keep it warm for 45 minutes, after the solution is clarified, add diethanolamine, phosphoric acid and defoamer in sequence, and cool to room temperature to obtain Sulfate-free, alkali-free liquid accelerator.

preparation Embodiment 2

[0034] Prepare materials according to the following weight ratio (%)

[0035] Amorphous aluminum hydroxide 20

[0036] Formic acid 15

[0037] Acetic acid 5

[0038] Oxalic acid 20

[0039] Phosphoric acid (98%) 1

[0040] Polyether defoamer 0.01

[0041] Diethanolamine 0.5

[0042] water 38.49

[0043] The preparation method of the above-mentioned liquid quick-setting agent for shotcrete is specifically:

[0044] Add aluminum hydroxide to part of the water to form a suspension, dissolve the mixture of hydroxycarboxylic acids in water to form a mixed solution of carboxylic acids, then add the mixed solution of carboxylic acids to the aluminum hydroxide suspension at a temperature of 90°C and keep it warm for 1.5 hours. After clarification, add diethanolamine, phosphoric acid and defoamer in sequence, and cool to normal temperature to obtain sulfate-free and alkali-free liquid accelerator.

preparation Embodiment 3

[0046] Prepare materials according to the following weight ratio (%)

[0047] Amorphous aluminum hydroxide 30

[0048] Formic acid 10

[0049] Maleic acid 20

[0050]Phosphoric acid (85%) 1

[0051] Triethanolamine 2

[0052] Silane defoamer 0.05

[0053] water 36.95

[0054] The preparation method of the above-mentioned liquid quick-setting agent for shotcrete is specifically:

[0055] First add aluminum hydroxide to water and stir quickly to form a suspension, then add hydroxycarboxylic acid at a temperature of 120°C and keep it warm for 2.5 hours. After the solution is clarified, add triethanolamine, phosphoric acid and defoamer in sequence, and cool to At normal temperature, the sulfate-free and alkali-free liquid quick-setting agent is obtained.

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Abstract

The invention discloses an alkali-free liquid setting accelerator which is prepared from the following components by weight percent: 18-40% of hydroxycarboxylic acid, 1-5% of phosphoric acid, 15-30% of aluminium hydroxide, 0-5% of alkylol amine, 0.01-0.2% of defoaming agent and the balance water. The alkali-free liquid setting accelerator of invention does not contain alkali metal ions, sulfate ions and other corrosive materials, is safe to use and has no bad effect on the durability of sprayed concrete, thus being capable to be used in the construction of sprayed concrete.

Description

technical field [0001] The invention relates to an alkali-free liquid quick-setting agent for wet-sprayed cement-based materials, in particular to a sulfate-free non-alkali liquid quick-setting agent for wet-sprayed concrete construction. Background technique [0002] Shotcrete has many advantages in construction and rock support, and has become a very important and necessary measure in modern underground engineering. In particular, the development of wet-mix shotcrete technology has greatly expanded the scope of use of shotcrete in underground engineering. The most important function of the liquid quick-setting agent for shotcrete is to accelerate the setting of the concrete mixture and improve the early strength, which can increase the thickness of the sprayed layer and shorten the time for spraying the next layer. [0003] Adding the accelerator to the cement slurry will promote the hydration reaction of minerals such as tricalcium aluminate and tricalcium silicate in ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/12E04G21/02E21D11/10C04B103/12
CPCC04B2103/10C04B2111/00172C04B2111/10C04B2111/1025C04B40/0039
Inventor 缪昌文张建纲冉千平刘加平周伟玲
Owner JIANGSU SOBUTE NEW MATERIALS
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