Alkali-free liquid setting accelerator and preparation method thereof
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A technology of quick-setting agent and liquid, which is applied in the field of alkali-free liquid quick-setting agent and its preparation, which can solve problems such as strength decline, and achieve the effect of preventing later strength decline, no loss of strength, and improved stability
Pending Publication Date: 2019-05-28
山西众诺和建材有限公司
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[0004] In order to overcome the problems existing in related technologies, the present invention provides a non-alkali liquid quick-setting agent, which solves the p
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Embodiment 1
[0035] see figure 1 , is a schematic flow diagram of the preparation method of the non-alkali liquid quick-setting agent provided by the embodiment of the present invention, and the preparation method includes the following steps:
[0036] Step S101, dissolving polyaluminum sulfate in water, and stirring at a speed of 150 revolutions per minute at a temperature of 55° C. to 65° C., so that polyaluminum sulfate is dissolved in water to obtain an aqueous solution of aluminum sulfate;
[0037] Step S102, adding a stabilizer to the aluminum sulfate aqueous solution to obtain a primary complexed mixed solution;
[0038] Step S103, adding a stabilizer to the aluminum sulfate aqueous solution to obtain a primary complexed mixed solution;
[0039] Step S104, adding magnesium sulfate to the secondary complexation mixed solution, stirring and dissolving to obtain the primary mixed solution;
[0040] Step S105, adding mineral acid, cellulose ether, and cyclodextrin-modified chitosan to...
Embodiment 2
[0042] Step S101, dissolving polyaluminum sulfate in water, and stirring at a speed of 150 revolutions per minute at a temperature of 55° C. to 65° C., so that polyaluminum sulfate is dissolved in water to obtain an aqueous solution of aluminum sulfate;
[0043] Step S102, adding a stabilizer to the aluminum sulfate aqueous solution to obtain a primary complexed mixed solution;
[0044] Step S103, adding a stabilizer to the aluminum sulfate aqueous solution to obtain a primary complexed mixed solution;
[0045] Step S104, adding magnesium sulfate to the secondary complexation mixed solution, stirring and dissolving to obtain the primary mixed solution;
[0046] Step S105, adding mineral acid, cellulose ether, and cyclodextrin-modified chitosan to the primary mixed liquid in sequence, mixing evenly, and cooling to obtain the alkali-free liquid quick-setting agent.
[0047] The stabilizer may be an organic carboxylic acid.
[0048] Wherein, the polyaluminum sulfate, magnesium ...
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Abstract
The embodiment of the invention provides an alkali-free liquid setting accelerator and a preparation method thereof. The alkali-free liquid setting accelerator is prepared from polyaluminum sulfate, magnesium sulfate, ethanolamine, inorganic acid, sodium fluoride, cellulose ether, cyclodextrin modified chitosan and a stabilizer. Aluminum ions have a main setting accelerating effect in the settingaccelerator; the alkali-free liquid setting accelerator provided by the invention selects the polyaluminum sulfate; the content of the aluminum ions in the polyaluminum sulfate is relatively high so that the setting accelerating effect can be remarkably improved. Meanwhile, a cement slurry structure doped with the setting accelerator is too rapidly condensed and pores cannot be filled, so that thestrength of the cement slurry structure is damaged; the magnesium sulfate is added and magnesium ions in the magnesium sulfate can be preferably combined with hydroxide ions to generate magnesium hydroxide to provide a crystal nucleus, so that hydration of tricalcium silicate is accelerated to separate out C-S-H gel for filling the pores; the strength of the cement slurry structure can not be damaged at a later period. The alkali-free liquid setting accelerator provided by the invention can be used for preventing a condition that the later-period strength of concrete doped with the alkali-free liquid setting accelerator is reduced.
Description
technical field [0001] The invention relates to the technical field of engineering materials, in particular to an alkali-free liquid quick-setting agent and a preparation method thereof. Background technique [0002] Shotcrete is concrete used for tunnel support, mine reinforcement, road repair, urban waterproofing and plugging, etc., and plays an important role in national infrastructure construction. Accelerator is an essential key material for preparing shotcrete. The development direction of accelerator products is chlorine-free and alkali-free liquid accelerator, which meets the requirements of concrete durability and wet spraying process. However, the current problems in the production and application of liquid accelerators are poor stability, high dosage, and varying degrees of loss of concrete strength in the later stage. [0003] Alkali-free liquid accelerator solves the problem of high alkali content in traditional accelerators, reduces the possibility of alkali-...
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