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A kind of alkali-free liquid accelerator and preparation method thereof

A technology of quick-setting agent and liquid, which is applied in the field of non-alkali liquid accelerator and its preparation, which can solve the problems that the non-alkali liquid quick-setting agent has not mentioned the frost resistance, so as to reduce the occurrence of settlement and freezing, and improve the frost resistance. Good, low cost effect

Active Publication Date: 2022-07-19
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the high-stability low-alkali liquid quick-setting agent provided by this invention has certain stability, it does not mention the frost resistance of the non-alkali liquid quick-setting agent

Method used

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  • A kind of alkali-free liquid accelerator and preparation method thereof
  • A kind of alkali-free liquid accelerator and preparation method thereof
  • A kind of alkali-free liquid accelerator and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The preparation of a functional auxiliary component comprises the following steps:

[0042] Polymerization

[0043] The three-necked flask was flushed with nitrogen, and then a certain amount of deionized water, 0.1 mol of pentylacryloyloxyethyl dimethylamine, 0.01 mol of polyethylene glycol ether and 0.0005 mol of hydroquinone were added, stirred and dissolved, and the temperature was gradually increased to 65 ℃, after constant temperature stirring for 10min, dropwise add the mixture of 0.1mol 1,5-pentyl sultone and 15ml acetone dropwise for 2h. Cooling to terminate the reaction, repeated washing after filtration, and vacuum drying at 60 °C to obtain functional monomer pentylacryloyloxy polyethylene glycol ether ethyldimethylaminopentanesulfonate;

[0044] Copolymerization

[0045]First add a certain amount of 0.5mol / L sodium chloride solution to the polymerization bottle, then add 0.3mol acrylamide and 0.001mol pentylacryloyloxy polyethylene glycol ether ethyldimeth...

Embodiment 2

[0049] The difference between this example and Example 1 is that the amount of polyethylene glycol ether used is 0.02 mol.

Embodiment 3

[0051] The preparation of alkali-free liquid accelerator includes the following steps:

[0052] (1) 42 parts of deionized water are stirred and heated, and after the temperature rises to 75°C, 50 parts of aluminum sulfate octadecahydrate are added to dissolve completely;

[0053] (2) be cooled to 55 ℃, add 4 parts of functional auxiliary components obtained in Example 1, and stir evenly;

[0054] (3) add 3 parts of diethanolamine, stir and dissolve, and mix well;

[0055] (4) Add 1 part of phosphoric acid, adjust the pH value of the solution to 6, and obtain an alkali-free liquid quick-setting agent with long storage period and good freezing resistance.

[0056] The effect of the accelerator prepared in this example on the setting time and compressive strength of the cement when the amount of the accelerator in the cement is 6 wt % is tested, and the specific results are shown in Table 1. See Table 2 for the specific results of testing the storage stability and frost resista...

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Abstract

The invention discloses an alkali-free liquid quick-setting agent. Its composition in parts by weight is as follows: 50-55 parts of aluminum sulfate; 3-5 parts of organic amine; 4-10 parts of functional auxiliary; 0.5-1 part of inorganic acid ; 40 to 50 parts of deionized water. Among them, the functional additive is an amphoteric micro-crosslinked polymer with reverse polyelectrolyte effect and micro-crosslinking effect, which has very obvious anti-settling and anti-freezing effects. It can be used in the preparation of alkali-free liquid accelerators. The main component of the quick-setting agent, aluminum sulfate, can exist stably in the solution, reducing the occurrence of sedimentation and freezing, and broadening the road for the popularization and application of the aluminum sulfate type alkali-free liquid quick-setting agent.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to an alkali-free liquid quick-setting admixture and a preparation method thereof. Background technique [0002] Accelerator is an admixture used in shotcrete, which can rapidly set and harden concrete. It is widely used in many fields such as tunnel engineering, water conservancy and hydropower, slope protection, mining, underground engineering and engineering repair. In recent years, with the rapid development of infrastructure construction and urban construction in China, the role of shotcrete in engineering has become larger and larger, and the demand has continued to increase. With the increasing adoption of tunnel construction technology in highway and railway construction in the western region, the high quality of shotcrete is the primary factor to ensure high-quality infrastructure projects and long service life in my country. Excellent shotcrete is very importan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/16C04B103/12
CPCC04B40/0039C04B2103/12C04B22/148C04B24/166C04B24/122C04B22/165
Inventor 周博儒郑涛王军赵日煦高飞熊龙李兴邢菊香包明余昆
Owner CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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