CN103819122A - Preparation method of low-alkaline liquid setting accelerator for sprayed concrete - Google Patents
Preparation method of low-alkaline liquid setting accelerator for sprayed concrete Download PDFInfo
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- CN103819122A CN103819122A CN201410032461.7A CN201410032461A CN103819122A CN 103819122 A CN103819122 A CN 103819122A CN 201410032461 A CN201410032461 A CN 201410032461A CN 103819122 A CN103819122 A CN 103819122A
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Abstract
The invention relates to a preparation method of a low-alkaline liquid setting accelerator for sprayed concrete. The low-alkaline liquid setting accelerator mainly comprises an aluminate modifier, an alkali metal aluminate solution, and an organic polymer material, and further comprises sodium hydroxide, potassium hydroxide and aluminum hydroxide, wherein the aluminate modifier is used to reduce alkalinity and improve stability of the solution; the organic polymer material mainly comprises a thickening agent and a water reducing agent; the thickening agent can increase cohesiveness of the concrete and reduce resilience magnitude of the concrete when sprayed; the water reducing agent mainly improves long-term strength of the sprayed concrete. The efficient low-alkaline liquid setting accelerator for concrete has a mixing amount of 2-4.5% of the mass of the cement, initial setting time of about 2 minutes, final setting time of about 5 minutes, and long-term strength loss within 10%. The low-alkaline liquid setting accelerator is high in stability, can effectively reduce resilience value and dust capacity in the sprayed concrete, and can be widely promoted and applied.
Description
Technical field
The present invention relates to building material field, be specifically related to a kind of sprayed concrete low-alkaline liquid accelerating agent preparation method.
Background technology
Concrete-spraying technology is widely used in the surrounding rock supporting of geotechnical engineering and underground works, accelerating chemicals is requisite admixture in sprayed concrete, it can make cement rapid coagulation sclerosis, thereby increases jet thickness, and its performance has considerable influence to sprayed concrete.Accelerating chemicals is mainly divided into powder accelerator and liquid accelerating agent, and powder accelerator is used for greatly in dry shotcreting, and liquid accelerating agent is mainly used in wet shotcreting.
Tradition accelerating chemicals mostly is powder accelerator, and alkalescence is larger, very large on sprayed concrete later strength loss impact, workmen is caused to certain injury simultaneously.At present, accelerating chemicals is just towards low alkali (alkali-free), liquid development.External is that the main component of this accelerating chemicals is water glass, is a kind of tasteless liquid, and the skin of human body is had to strong corrosion injury effect by west card (Sika) accelerating chemicals of Switzerland and Austria's development the earliest.In succession there is the accelerating chemicals take aluminate, carbonate as main component the seventies, be called as traditional alkaline accelerating chemicals.Nowadays, developed some alkali-free quick-coagulants abroad, but expensive.
At present, the most of engineering of China, still using moist spurting craft, is used powder accelerator in technique, and in course of injection, Dust Capacity is very large, occurs falling the situations such as slurry and springback capacity are large, and construction is caused to very large impact.Powder accelerator disperses inhomogeneous while interpolation, cause a large amount of wastes and late strength of concrete loss serious.The liquid accelerating agent quality of domestic production is very unstable, bad adaptability, and addition is high, and generally all 6% ~ 10%, and alkalescence is strong, and workmen's construction is caused to very large harm.
Powdery and liquid accelerating agent are now mostly strong basicity, easily cause sprayed concrete alkali-aggregate reaction, and later strength is lost generally 30% ~ 40%, does not reach engine request far away, for adjoining rock stability exists very large hidden danger.Alkali-free liquid accelerating agent refers to alkali (Na
2o+0.658K
2o) content accounts for below 1% of accelerating chemicals total mass, existing alkaline accelerating chemicals alkali (Na
2o+0.658K
2o) content is generally 16% ~ 25%.Alkali-free quick-coagulant on market is expensive, and volume is large, applies cost very high.
Summary of the invention
The object of this invention is to provide a kind of sprayed concrete low-alkaline liquid accelerating agent preparation method, accelerating chemicals time of coagulation prepared by the method is short, later strength loss is little, can effectively reduce springback capacity and dust concentration.
The preparation method of low-alkaline liquid accelerating agent for sprayed concrete of the present invention, concrete steps are as follows:
(1) preparation of aluminate mother liquor
Sodium hydroxide or potassium hydroxide and aluminium hydroxide are added to the water, then be heated to 120 ℃, react and within 3 ~ 4 hours, obtain aluminate mother liquor, described aluminium hydroxide content is 25% ~ 45%, sodium hydrate content is 15 ~ 30%, potassium hydroxide content is 15 ~ 30%, adds that the content of water meets 100%, and sodium ion or potassium ion: aluminum ion mol ratio is 1.1 ~ 1.5:1;
(2) preparation of aluminate properties-correcting agent
First sodium carbonate or salt of wormwood are added to the water, are heated to 70 ℃ ~ 80 ℃, then add water glass, form transparent liquid, be properties-correcting agent, described carbonate content is 10% ~ 20%, and salt of wormwood content is 10% ~ 20%, water glass content is 20% ~ 40%, and all the other quality are water, and total content is 100%;
(3) preparation of low-alkaline liquid accelerating agent
Above-mentioned aluminate mother liquor is added in there-necked flask, unlatching high-shear is stirred, aluminate properties-correcting agent carries out titration and adds, temperature is controlled at 40 ℃ ~ 60 ℃ left and right, titration time is 2h, the mass ratio of controlling properties-correcting agent and aluminate mother liquor is 2 ~ 4, treat that colloid appears in solution, add the water reducer of tackifier, properties-correcting agent and the aluminate mother liquor quality 3/1000ths to 4/1000ths of properties-correcting agent and aluminate mother liquor quality ten thousand/to 3/10000ths, continue reaction 1h, in the time that solution becomes clear solution, to obtain final product.
The preparation method of low-alkaline liquid accelerating agent for sprayed concrete of the present invention, compared with the prior art, has the following advantages:
(1) in the preparation process of aluminate mother liquor, by controlling sodium (potassium) aluminum ions mol ratio, and the content of synthetic sodium aluminate and potassium aluminate, greatly improve the stability of mother liquor, suppress the generation of precipitation;
(2) adopt aluminate properties-correcting agent, effectively control the time of coagulation of liquid accelerating agent, reduce the alkalescence of aluminate mother liquor simultaneously, meet low alkali requirement, pH value is below 11;
(3) tackifier main component is polyacrylamide, can increase concrete cohesiveness, with the abundant contact reacts of cement, reduces the springback capacity of sprayed concrete, and adding of water reducer can improve sprayed concrete later strength;
(4) adopt ordinary method to realize suitability for industrialized production, control operation simple, cost is lower, meets the requirement of scale operation;
(5) according to JC477-2005 " sprayed concrete accelerating chemicals " Plays requirement, cement is carried out to clean slurry test, liquid accelerating agent of the present invention is under 2% ~ 4.5% low-dosage, and the presetting period is 2min, and final setting time is 5min.
(6) according to JC477-2005 " sprayed concrete accelerating chemicals " Plays requirement, carry out sand-cement slurry test, measuring 1 day intensity is 13MPa, and within 28 days, strength ratio is more than 90%.
Sprayed concrete low-alkaline liquid accelerating agent prepared by the inventive method, through test and on probation, has all obtained satisfied technique effect, and efficiency test data is as follows:
The test of cement paste time of coagulation and sand-cement slurry ultimate compression strength is carried out in requirement according to JC477-2005 " sprayed concrete accelerating chemicals ".Wherein, the volume of liquid accelerating agent is according to the percentage calculation of cement weight.
Cement paste is measured time of coagulation:
Cement 400g
Water 154g;
Sand-cement slurry compressive strength determination:
Cement 900g
Standard sand 1350g
Water 450g.
Test-results is as shown in table 1:
Table 1 accelerating chemicals effect
As can be seen from the table, this liquid accelerating agent all can meet the requirement of acceptable end product in JC477-2005 " sprayed concrete accelerating chemicals ".In application, also have fine qualities at the scene, can effectively improve the performance of sprayed concrete each side.
Embodiment
embodiment 1
A preparation method for low-alkaline liquid accelerating agent for sprayed concrete, step is as follows:
(1) preparation of aluminate mother liquor
By the aluminium hydroxide of the sodium hydroxide of 35 parts and 35 parts, and the water of 30 parts (being mass parts), at the temperature of 120 ℃, reaction 3 ~ 4h, makes aluminate mother liquor;
(2) preparation of aluminate properties-correcting agent
By water-soluble the sodium carbonate of 14 parts, be heated to 70 ℃ ~ 80 ℃, then add the water glass of 30 parts, form transparent solution and be properties-correcting agent;
(3) preparation of low-alkaline liquid accelerating agent
Above-mentioned aluminate mother liquor is added in there-necked flask, unlatching high-shear is stirred, aluminate properties-correcting agent carries out titration and adds, temperature is controlled at 40 ℃ ~ 60 ℃ left and right, titration time is 2h, the mass ratio of controlling properties-correcting agent and aluminate mother liquor is 2, treat that colloid appears in solution, add properties-correcting agent and aluminate mother liquor quality ten thousand/ the water reducer of tackifier, properties-correcting agent and aluminate mother liquor quality 3/1000ths, continue reaction 1h, in the time that solution becomes clear solution, obtain this efficient low-alkaline liquid accelerating agent.
embodiment 2
A preparation method for low-alkaline liquid accelerating agent for sprayed concrete, step is as follows:
(1) preparation of aluminate mother liquor
By the aluminium hydroxide of the sodium hydroxide of 20 parts and 30 parts, and the water of 50 parts (being mass parts), at the temperature of 120 ℃, reaction 3 ~ 4h, makes aluminate mother liquor;
(2) preparation of aluminate properties-correcting agent
By water-soluble the sodium carbonate of 20 parts, be heated to 70 ℃ ~ 80 ℃, then add the water glass of 40 parts, form transparent solution and be properties-correcting agent;
(3) preparation of low-alkaline liquid accelerating agent
Above-mentioned aluminate mother liquor is added in there-necked flask, unlatching high-shear is stirred, aluminate properties-correcting agent carries out titration and adds, temperature is controlled at 40 ℃ ~ 60 ℃ left and right, titration time is 2h, the mass ratio of controlling properties-correcting agent and aluminate mother liquor is 3, treat that colloid appears in solution, add the water reducer of tackifier, properties-correcting agent and the aluminate mother liquor quality 4/1000ths of properties-correcting agent and aluminate mother liquor quality 2/10000ths, continue reaction 1h, in the time that solution becomes clear solution, obtain this efficient low-alkaline liquid accelerating agent.
embodiment 3
A preparation method for low-alkaline liquid accelerating agent for sprayed concrete, step is as follows:
(1) preparation of aluminate mother liquor
By the aluminium hydroxide of the potassium hydroxide of 20 parts and 35 parts, and the water of 45 parts (being mass parts), at the temperature of 120 ℃, reaction 3 ~ 4h, makes aluminate mother liquor;
(2) preparation of aluminate properties-correcting agent
By water-soluble the salt of wormwood of 20 parts, be heated to 70 ℃ ~ 80 ℃, then add the water glass of 32 parts, form transparent solution and be properties-correcting agent;
(3) preparation of low-alkaline liquid accelerating agent
Above-mentioned aluminate mother liquor is added in there-necked flask, unlatching high-shear is stirred, aluminate properties-correcting agent carries out titration and adds, temperature is controlled at 40 ℃ ~ 60 ℃ left and right, titration time is 2h, the mass ratio of controlling properties-correcting agent and aluminate mother liquor is 3, treat that colloid appears in solution, add the water reducer of tackifier, properties-correcting agent and the aluminate mother liquor quality 4/1000ths of properties-correcting agent and aluminate mother liquor quality 3/10000ths, continue reaction 1h, in the time that solution becomes clear solution, obtain this efficient low-alkaline liquid accelerating agent.
Claims (1)
1. a sprayed concrete low-alkaline liquid accelerating agent preparation method, is characterized in that: it comprises the following steps:
(1) preparation of aluminate mother liquor
Sodium hydroxide or potassium hydroxide and aluminium hydroxide are added to the water, are then heated to 120 ℃, react and within 3 ~ 4 hours, obtain aluminate mother liquor; Described aluminium hydroxide content is 25% ~ 45%, and sodium hydrate content is 15% ~ 30%, and potassium hydroxide content is 15% ~ 30%, adds that the content of water meets 100%, and sodium ion or potassium ion: aluminum ion mol ratio is 1.1 ~ 1.5:1;
(2) preparation of aluminate properties-correcting agent
First sodium carbonate or salt of wormwood are added to the water, be heated to 70 ℃ ~ 80 ℃, then add water glass, form transparent liquid, be properties-correcting agent, described carbonate content is 10% ~ 20%, salt of wormwood content is 10% ~ 20%, water glass content is 20% ~ 40%, and all the other quality are water, and meeting total content is 100%;
(3) preparation of low-alkaline liquid accelerating agent
Above-mentioned aluminate mother liquor is added in there-necked flask, unlatching high-shear is stirred, aluminate properties-correcting agent carries out titration and adds, temperature is controlled at 40 ℃ ~ 60 ℃ left and right, titration time is 2h, the mass ratio of controlling properties-correcting agent and aluminate mother liquor is 2 ~ 4, treat that colloid appears in solution, add the water reducer of tackifier, properties-correcting agent and the aluminate mother liquor quality 3/1000ths to 4/1000ths of properties-correcting agent and aluminate mother liquor quality ten thousand/to 3/10000ths, continue reaction 1h, in the time that solution becomes clear solution, to obtain final product.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104977314A (en) * | 2015-06-15 | 2015-10-14 | 江苏奥莱特新材料有限公司 | Method for determining stability of liquid accelerator |
| CN104990829A (en) * | 2015-06-15 | 2015-10-21 | 江苏奥莱特新材料有限公司 | Method for detecting stability of supernatant liquid accelerating agent |
| CN105152573A (en) * | 2015-08-25 | 2015-12-16 | 建华建材（蚌埠）有限公司 | Clean odorless liquid accelerator and preparation method thereof |
| CN106082750A (en) * | 2016-06-02 | 2016-11-09 | 石家庄市长安育才建材有限公司 | Gunite concrete low resilience liquid accelerator and preparation method thereof |
| CN106746838A (en) * | 2016-11-28 | 2017-05-31 | 欧阳会幼 | A kind of aluminate modified high-efficient liquid accelerator |
| CN109437638A (en) * | 2018-12-28 | 2019-03-08 | 巩义市豫源建筑工程材料有限责任公司 | Low-alkali liquid quick-setting agent |
| CN109761532A (en) * | 2019-01-21 | 2019-05-17 | 江苏奥莱特新材料股份有限公司 | The low rebound of one kind, high early-strength alkali-free liquid accelerator and preparation method thereof |
| CN112209651A (en) * | 2020-10-12 | 2021-01-12 | 南京创企和利科技有限公司 | Concrete accelerator and preparation method thereof |
| CN112408841A (en) * | 2020-11-19 | 2021-02-26 | 深圳港创建材股份有限公司 | Aluminate flow state concrete powder quick drying agent and use method thereof |
| CN113480223A (en) * | 2021-08-20 | 2021-10-08 | 河北志瑞新材料科技有限公司 | Preparation and application of concrete quick-setting waterproofing agent |
| CN114804713A (en) * | 2022-04-13 | 2022-07-29 | 江西建衡环保科技有限公司 | Preparation method and application of polyaluminium sulfate modified accelerator |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104977314A (en) * | 2015-06-15 | 2015-10-14 | 江苏奥莱特新材料有限公司 | Method for determining stability of liquid accelerator |
| CN104990829A (en) * | 2015-06-15 | 2015-10-21 | 江苏奥莱特新材料有限公司 | Method for detecting stability of supernatant liquid accelerating agent |
| CN104977314B (en) * | 2015-06-15 | 2017-10-13 | 江苏中铁奥莱特新材料股份有限公司 | A kind of method for determining liquid accelerator stability |
| CN105152573A (en) * | 2015-08-25 | 2015-12-16 | 建华建材（蚌埠）有限公司 | Clean odorless liquid accelerator and preparation method thereof |
| CN106082750A (en) * | 2016-06-02 | 2016-11-09 | 石家庄市长安育才建材有限公司 | Gunite concrete low resilience liquid accelerator and preparation method thereof |
| CN106746838A (en) * | 2016-11-28 | 2017-05-31 | 欧阳会幼 | A kind of aluminate modified high-efficient liquid accelerator |
| CN109437638A (en) * | 2018-12-28 | 2019-03-08 | 巩义市豫源建筑工程材料有限责任公司 | Low-alkali liquid quick-setting agent |
| CN109761532A (en) * | 2019-01-21 | 2019-05-17 | 江苏奥莱特新材料股份有限公司 | The low rebound of one kind, high early-strength alkali-free liquid accelerator and preparation method thereof |
| CN109761532B (en) * | 2019-01-21 | 2021-06-15 | 江苏奥莱特新材料股份有限公司 | Low-resilience high-early-strength alkali-free liquid accelerator and preparation method thereof |
| CN112209651A (en) * | 2020-10-12 | 2021-01-12 | 南京创企和利科技有限公司 | Concrete accelerator and preparation method thereof |
| CN112408841A (en) * | 2020-11-19 | 2021-02-26 | 深圳港创建材股份有限公司 | Aluminate flow state concrete powder quick drying agent and use method thereof |
| CN113480223A (en) * | 2021-08-20 | 2021-10-08 | 河北志瑞新材料科技有限公司 | Preparation and application of concrete quick-setting waterproofing agent |
| CN114804713A (en) * | 2022-04-13 | 2022-07-29 | 江西建衡环保科技有限公司 | Preparation method and application of polyaluminium sulfate modified accelerator |
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Application publication date: 20140528 |