CN112939511A - Alkali-free liquid accelerator - Google Patents
Alkali-free liquid accelerator Download PDFInfo
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- CN112939511A CN112939511A CN202110379580.XA CN202110379580A CN112939511A CN 112939511 A CN112939511 A CN 112939511A CN 202110379580 A CN202110379580 A CN 202110379580A CN 112939511 A CN112939511 A CN 112939511A
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- parts
- alkali
- free liquid
- liquid accelerator
- sulfate
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/10—Accelerators; Activators
- C04B2103/12—Set accelerators
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to the technical field of building materials, in particular to an alkali-free liquid accelerator. The raw material comprises 30-50 parts of sulfate; 5-10 parts of alcohol amine; 1-5 parts of a suspending agent; 1-10 parts of a thickening agent; 1-5 parts of a pH regulator; 1-5 parts of a defoaming agent; 2-8 parts of fluorosilicate; 10-20 parts of polymeric ferric sulfate salt; alkaline silica sol: 10-30 parts. The invention aims to provide an alkali-free liquid accelerator which has good compatibility with various concrete, wide adaptability, effective inhibition of precipitation, good storage stability and no influence on the uniformity of sprayed concrete; has no corrosiveness and special odor, and has no adverse effect on constructors.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to an alkali-free liquid accelerator.
Background
The quick-setting admixture is used in the construction industry, plays an important role in the aspects of quick setting, early strength and the like of concrete, and is rapidly one of indispensable materials in sprayed concrete since the past. The quality of concrete is influenced by the type and quality of the accelerator, and the quality of the accelerator for sprayed concrete is strictly controlled in various countries. The accelerator is divided into two types, namely a powder accelerator and a liquid accelerator, the application scenes of the accelerators in different states are different, and the liquid accelerator is mostly used in modern concrete tank trucks. At present, the relatively mature accelerator in China is an alkaline accelerator or a low-alkaline accelerator, and has certain corrosivity due to alkalinity or alkalescence, so that the hardness and the strength of concrete can be influenced to a certain extent under the action of a long time; in addition, the alkaline setting accelerator also has an influence on the health of construction personnel during construction.
The liquid alkali-free accelerator has the advantages of small damage to constructors, no adverse effect on concrete durability, strength, hardness and the like, is a hot topic of the current accelerator research, and some liquid alkali-free accelerators appear on the market. However, in the actual use process, the matching item of the liquid alkali-free setting accelerator and the existing concrete is not good, and the liquid alkali-free setting accelerator is seriously influenced by the type and the batch of the concrete, so that the liquid alkali-free setting accelerator is not beneficial to the wide use of the liquid alkali-free setting accelerator.
Disclosure of Invention
The invention aims to provide an alkali-free liquid accelerator which has good compatibility with various concrete, wide adaptability, effective inhibition of precipitation, good storage stability and no influence on the uniformity of sprayed concrete; has no corrosiveness and special odor, and has no adverse effect on constructors.
In order to achieve the purpose, the invention provides the following technical scheme:
an alkali-free liquid accelerator comprises the following raw materials in parts by weight:
the sulfate is one or more of polyaluminium sulfate, polymeric magnesium sulfate and ferric sulfate;
the basic degree of the polymeric ferric sulfate is 8-16%;
the alcohol amine is one or more of diethanolamine, triethanolamine, triisopropanolamine and methyldiethanolamine;
the suspending agent is one or more of hydroxypropyl starch ether, graphene oxide, sodium polyacrylate and polyoxyethylene;
the thickening agent is one or more of modified magnesium aluminum silicate, bentonite, attapulgite and aluminum silicate;
the pH regulator is an alkaline pH regulator, preferably ethylenediamine or ammonia water;
the defoaming agent is one of an organic silicon defoaming agent and a polyether defoaming agent;
the fluosilicate is one or more of magnesium fluosilicate, zinc fluosilicate and aluminum fluosilicate;
the preparation method of the alkali-free liquid accelerator comprises the following steps:
(1) mixing sulfate and fluorosilicate in parts by weight, adding water in an amount which is 0.6-0.8 times of the weight of the sulfate, and fully dissolving in a constant-temperature water bath at 60-90 ℃ to obtain a solution A;
(2) mixing polymeric ferric sulfate, alkaline silica sol, a suspending agent and a thickening agent in parts by weight, adding water in an amount which is 3-5 times that of the thickening agent in parts by weight, and heating to 50-80 ℃ to obtain a solution B;
(3) and (3) dripping the solution A into the solution B for 15-30 min, continuously stirring after dripping, sequentially adding the alcohol amine, the pH regulator and the defoaming agent in parts by weight, and stirring for 1-2 hours to obtain the alkali-free liquid accelerator.
The invention has the advantages that:
according to the invention, fluosilicate is added into a reaction system of sulfate and alcohol amine, the initial setting time is adjusted, the early strength of concrete is improved, and the thickening agent and the suspending agent are synergistically thickened and dispersed, so that the storage stability is improved together. The polymeric ferric sulfate and the alkaline silica sol are adopted, and ferric ions generated after the polymeric ferric sulfate is hydrolyzed form a polynuclear complex which is polymerized with the alkaline silica sol, so that the coagulability of the traditional liquid accelerator is improved, the generation of precipitates can be effectively inhibited, the storage stability is good, and the storage period can be more than 12 months. The concrete spraying agent is suitable for sprayed concrete, has good compatibility with various concretes, has wide adaptability, and does not influence the uniformity of the sprayed concrete; has no corrosiveness and special odor, and has no adverse effect on constructors. The use mode of the alkali-free liquid accelerator is the same as that of the conventional liquid accelerator, a new use mode is not needed in the use process of sprayed concrete, and the defect that the later strength of the concrete is obviously reduced due to the large amount of doped traditional alkali accelerators is overcome.
Detailed Description
The technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
An alkali-free liquid accelerator comprises the following raw materials in parts by weight: 30 parts of sulfate; 10 parts of polymeric ferric sulfate salt; 10 parts of alkaline silica sol; 5 parts of alcohol amine; 2 parts of fluorosilicate; 1 part of a suspending agent; 1 part of a thickening agent; 1 part of pH regulator; and 1 part of a defoaming agent.
The sulfate is polyaluminium sulfate; the alcohol amine is diethanol amine; the suspending agent is hydroxypropyl starch ether; the thickening agent is modified magnesium aluminum silicate; the pH regulator is ethylenediamine; the defoaming agent is an organic silicon defoaming agent; the fluosilicate is magnesium fluosilicate;
the preparation method of the alkali-free liquid accelerator comprises the following steps:
(1) mixing sulfate and fluorosilicate in parts by weight, adding water in an amount which is 0.6 times that of the sulfate in parts by weight, and fully dissolving in a constant-temperature water bath at 60 ℃ to obtain a solution A;
(2) mixing polymeric ferric sulfate salt, alkaline silica sol, a suspending agent and a thickening agent in parts by weight, adding water in an amount which is 3 times that of the thickening agent in parts by weight, and heating to 50 ℃ to obtain a solution B;
(3) and (3) dripping the solution A into the solution B for 15min, continuously stirring after dripping, sequentially adding the alcohol amine, the pH regulator and the defoaming agent in parts by weight, and stirring for 1 hour to obtain the alkali-free liquid accelerator.
Example 2
An alkali-free liquid accelerator comprises the following raw materials in parts by weight: 50 parts of sulfate; 20 parts of polymeric ferric sulfate salt; 30 parts of alkaline silica sol; 10 parts of alcohol amine; 8 parts of fluorosilicate; 5 parts of a suspending agent; 10 parts of a thickening agent; 5 parts of a pH regulator; 5 parts of a defoaming agent.
The sulfate is polyaluminium sulfate and polyaluminium sulfate; the alcohol amine is diethanolamine or triethanolamine; the suspending agent is hydroxypropyl starch ether and graphene oxide; the thickening agent is modified magnesium aluminum silicate and bentonite; the pH regulator is ammonia water; the defoaming agent is polyether defoaming agent; the fluosilicate is magnesium fluosilicate and zinc fluosilicate;
the preparation method of the alkali-free liquid accelerator comprises the following steps:
(1) mixing sulfate and fluorosilicate in parts by weight, adding water in an amount which is 0.8 times that of the sulfate in parts by weight, and fully dissolving in a constant-temperature water bath at 90 ℃ to obtain a solution A;
(2) mixing polymeric ferric sulfate, alkaline silica sol, a suspending agent and a thickening agent in parts by weight, adding water in an amount which is 5 times that of the thickening agent in parts by weight, and heating to 80 ℃ to obtain a solution B;
(3) and (3) dripping the solution A into the solution B for 30min, continuously stirring after dripping, sequentially adding the alcohol amine, the pH regulator and the defoaming agent in parts by weight, and stirring for 2 hours to obtain the alkali-free liquid accelerator.
Example 3
An alkali-free liquid accelerator comprises the following raw materials in parts by weight: 40 parts of sulfate; 15 parts of polymeric ferric sulfate salt; 20 parts of alkaline silica sol; 7 parts of alcohol amine; 5 parts of fluorosilicate; 3 parts of a suspending agent; 5 parts of a thickening agent; 3 parts of a pH regulator; and 3 parts of a defoaming agent.
The sulfate is polyaluminium sulfate, or ferric sulfate; the alcohol amine is diethanol amine; the suspending agent is sodium polyacrylate; the thickening agent is modified magnesium aluminum silicate or aluminum silicate; the pH regulator is ethylenediamine; the defoaming agent is an organic silicon defoaming agent; the fluosilicate is magnesium fluosilicate;
the preparation method of the alkali-free liquid accelerator is the same as that of example 1.
Example 4
An alkali-free liquid accelerator comprises the following raw materials in parts by weight: 45 parts of sulfate; 12 parts of polymeric ferric sulfate salt; 25 parts of alkaline silica sol; 8 parts of alcohol amine; 6 parts of fluorosilicate; 2 parts of a suspending agent; 7 parts of a thickening agent; 2 parts of a pH regulator; and 2 parts of a defoaming agent.
The sulfate is polymerized magnesium sulfate; the alcohol amine is triisopropanolamine and methyldiethanolamine; the suspending agent is graphene oxide; the thickening agent is aluminum silicate; the pH regulator is ammonia water; the defoaming agent is polyether defoaming agent; the fluosilicate is magnesium fluosilicate, zinc fluosilicate and aluminum fluosilicate;
the preparation method of the alkali-free liquid accelerator is the same as that of example 2.
Table 1: test results of shotcrete
Compared with the commercially available alkali-free liquid setting accelerator, the invention has the advantages of short initial setting time and final setting time, high 1d compressive strength and 28d compressive strength ratio and good stability.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. The alkali-free liquid accelerator is characterized by comprising the following raw materials in parts by weight:
2. the alkali-free liquid accelerator according to claim 1, wherein: the sulfate is one or more of polyaluminium sulfate, polymeric magnesium sulfate and ferric sulfate; the basic degree of the polymeric ferric sulfate salt is 8-16%.
3. The alkali-free liquid accelerator according to claim 1, wherein: the alcohol amine is one or more of diethanolamine, triethanolamine, triisopropanolamine and methyldiethanolamine.
4. The alkali-free liquid accelerator according to claim 1, wherein: the suspending agent is one or more of hydroxypropyl starch ether, graphene oxide, sodium polyacrylate and polyoxyethylene.
5. The alkali-free liquid accelerator according to claim 1, wherein: the thickening agent is one or more of modified magnesium aluminum silicate, bentonite, attapulgite and aluminum silicate.
6. The alkali-free liquid accelerator according to claim 1, wherein: the pH regulator is an alkaline pH regulator.
7. The alkali-free liquid accelerator according to claim 1, wherein: the defoaming agent is one of an organic silicon defoaming agent and a polyether defoaming agent.
8. The alkali-free liquid accelerator according to claim 1, wherein: the fluosilicate is one or more of magnesium fluosilicate, zinc fluosilicate and aluminum fluosilicate.
9. The alkali-free liquid accelerator according to any one of claims 1 to 8, wherein the preparation method comprises the steps of:
(1) mixing sulfate and fluorosilicate in parts by weight, adding water in an amount which is 0.6-0.8 times of the weight of the sulfate, and fully dissolving in a constant-temperature water bath at 60-90 ℃ to obtain a solution A;
(2) mixing polymeric ferric sulfate, alkaline silica sol, a suspending agent and a thickening agent in parts by weight, adding water in an amount which is 3-5 times that of the thickening agent in parts by weight, and heating to 50-80 ℃ to obtain a solution B;
(3) and (3) dripping the solution A into the solution B for 15-30 min, continuously stirring after dripping, sequentially adding the alcohol amine, the pH regulator and the defoaming agent in parts by weight, and stirring for 1-2 hours to obtain the alkali-free liquid accelerator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110379580.XA CN112939511A (en) | 2021-04-08 | 2021-04-08 | Alkali-free liquid accelerator |
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| CN202110379580.XA CN112939511A (en) | 2021-04-08 | 2021-04-08 | Alkali-free liquid accelerator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114031326A (en) * | 2021-11-22 | 2022-02-11 | 宜昌鑫特瑞科技有限公司 | Alkali-free liquid accelerator based on superfine limestone suspension polyaluminum sulfate and preparation method thereof |
| CN114276046A (en) * | 2022-02-18 | 2022-04-05 | 重庆天耀建材有限公司 | Alkali-free liquid accelerator |
Citations (5)
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|---|---|---|---|---|
| CN105384377A (en) * | 2015-11-06 | 2016-03-09 | 湖北工业大学 | Accelerator auxiliary material based on composite polymerized flocculating agent and preparation method thereof |
| CN107840593A (en) * | 2017-11-17 | 2018-03-27 | 武汉理工大学 | A kind of gunite concrete early-strength alkali-free liquid setting accelerator and preparation method thereof |
| CN109206040A (en) * | 2018-07-10 | 2019-01-15 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | A kind of alkali-free liquid setting accelerator adapting to various model cement extensively |
| KR20190081025A (en) * | 2017-12-29 | 2019-07-09 | 한국세라믹기술원 | Alkali-free quick setting agent, cement paste composition, cement mortar composition and cement contrete composition using the agent |
| CN110922085A (en) * | 2019-12-16 | 2020-03-27 | 武汉优城科技有限公司 | Aluminum sulfate supersaturated suspension type alkali-free liquid accelerator and preparation method thereof |
-
2021
- 2021-04-08 CN CN202110379580.XA patent/CN112939511A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105384377A (en) * | 2015-11-06 | 2016-03-09 | 湖北工业大学 | Accelerator auxiliary material based on composite polymerized flocculating agent and preparation method thereof |
| CN107840593A (en) * | 2017-11-17 | 2018-03-27 | 武汉理工大学 | A kind of gunite concrete early-strength alkali-free liquid setting accelerator and preparation method thereof |
| KR20190081025A (en) * | 2017-12-29 | 2019-07-09 | 한국세라믹기술원 | Alkali-free quick setting agent, cement paste composition, cement mortar composition and cement contrete composition using the agent |
| CN109206040A (en) * | 2018-07-10 | 2019-01-15 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | A kind of alkali-free liquid setting accelerator adapting to various model cement extensively |
| CN110922085A (en) * | 2019-12-16 | 2020-03-27 | 武汉优城科技有限公司 | Aluminum sulfate supersaturated suspension type alkali-free liquid accelerator and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114031326A (en) * | 2021-11-22 | 2022-02-11 | 宜昌鑫特瑞科技有限公司 | Alkali-free liquid accelerator based on superfine limestone suspension polyaluminum sulfate and preparation method thereof |
| CN114031326B (en) * | 2021-11-22 | 2022-11-25 | 宜昌鑫特瑞科技有限公司 | Alkali-free liquid accelerator based on superfine limestone suspension polyaluminum sulfate and preparation method thereof |
| CN114276046A (en) * | 2022-02-18 | 2022-04-05 | 重庆天耀建材有限公司 | Alkali-free liquid accelerator |
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Application publication date: 20210611 |
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