CN112194408A - Liquid alkali-free accelerator and preparation method thereof - Google Patents
Liquid alkali-free accelerator and preparation method thereof Download PDFInfo
- Publication number
- CN112194408A CN112194408A CN202011221495.2A CN202011221495A CN112194408A CN 112194408 A CN112194408 A CN 112194408A CN 202011221495 A CN202011221495 A CN 202011221495A CN 112194408 A CN112194408 A CN 112194408A
- Authority
- CN
- China
- Prior art keywords
- stirring
- liquid alkali
- minutes
- free accelerator
- free
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
-
- 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
Abstract
The invention discloses a liquid alkali-free accelerator and a preparation method thereof, wherein the liquid alkali-free accelerator is prepared from the following raw materials in percentage by weight: 40-70% of aluminum sulfate, 1-5% of reinforcing agent, 0.1-5% of dispersing agent, 0.1-1% of thickening agent, 0.1-10% of organic alcohol amine and the balance of water, and the balance is 100%. The liquid alkali-free accelerator is prepared at normal temperature, no additional heating is needed in the production process, and the energy is saved and the environment is protected; 6-9% of doping amount, less than 5 minutes of initial setting time, less than 12 minutes of final setting time, 1-day strength greater than 7 MPa, and 28-day strength is not lost; good storage stability, no precipitation and no delamination after 3 months.
Description
Technical Field
The invention belongs to the technical field of building materials, and relates to a preparation method of a liquid alkali-free accelerator.
Background
The accelerator is an additive which can make the sprayed concrete quickly set and harden in a short time. The spraying technology is divided into dry spraying and wet spraying according to different construction processes, and a powder accelerator and a liquid accelerator are correspondingly needed. In view of the advantages of concrete uniformity, control of resilience, and construction efficiency, wet spraying technology is increasingly popular and replaces dry spraying technology.
The liquid accelerator is divided into an alkaline liquid accelerator and an alkali-free liquid accelerator. The pH value of the alkaline liquid accelerator is high, the strength of the sprayed concrete for 1 day can be improved, but the introduction of alkaline substances can cause later-stage alkaline aggregate reaction, so that the durability of a concrete structure in a service period is reduced. In addition, the alkali setting accelerator has great influence on the working environment of a construction site. The improvement of environmental awareness also makes large-scale popularization of the alkali-free accelerator possible. Most of alkali-free accelerators on the market at present are large in mixing amount, long in coagulation time, poor in storage stability and low in strength for 1 day.
Disclosure of Invention
The invention aims to provide a liquid alkali-free accelerator. The preparation method is simple and easy to operate, and has the advantages of short coagulation time, high strength for 1 day and good storage stability.
The specific technical scheme for realizing the purpose of the invention is as follows:
the liquid alkali-free accelerator is characterized by comprising the following raw materials in percentage by weight:
40-70% of aluminum sulfate;
1-5% of a reinforcing agent;
0.1 to 5 percent of dispersant;
0.1 to 1 percent of thickening agent;
0.1 to 10 percent of organic alcohol amine;
the balance of water, and the balance is 100 percent.
The liquid alkali-free accelerator is characterized in that the preparation method comprises the following steps:
1) weighing a certain amount of dispersing agent and water, placing the dispersing agent and the water into a reaction kettle, and stirring at a low speed until the bottom materials are completely dissolved, wherein the stirring speed is 10-100 revolutions per minute, and the stirring time is 5-10 minutes;
2) weighing a certain amount of aluminum sulfate, adding into the base material while keeping stirring at a stirring speed of 10-100 r/min for 30-60 min;
3) weighing a certain amount of reinforcing agent, adding the reinforcing agent into a reaction kettle, and simultaneously keeping stirring, wherein the stirring speed is 1000-3000 r/min, and the stirring time is 10-30 min;
4) weighing a certain amount of organic alcohol amine, adding the organic alcohol amine into a reaction kettle, and simultaneously keeping stirring, wherein the stirring speed is 1000-3000 r/min, and the stirring time is 5-10 min;
5) weighing a certain amount of thickening agent, adding the thickening agent into a reaction kettle, and simultaneously keeping stirring, wherein the stirring speed is 1000-3000 r/min, and the stirring time is 10-30 min;
6) standing for 30-600 minutes, starting stirring at the speed of 1000-3000 r/min for 10-30 minutes. And (5) obtaining the liquid alkali-free setting accelerator after stirring.
The liquid alkali-free accelerator is characterized in that the aluminum sulfate is aluminum sulfate octadecahydrate, wherein the content of aluminum oxide is more than or equal to 17 percent.
The liquid alkali-free accelerator is characterized in that the reinforcing agent is one or a mixture of more of lithium sulfate, lithium carbonate, calcium formate, calcium acetate and magnesium sulfate.
The liquid alkali-free accelerator is characterized in that the dispersant is one or a mixture of a plurality of polycarboxylic acid water reducing agent, a naphthalene water reducing agent and a melamine water reducing agent.
The liquid alkali-free accelerator is characterized in that the organic alcohol amine is one or a mixture of more of ethanolamine, diethanolamine, triethanolamine, ethylene glycol monoisopropanolamine and triisopropanolamine.
The liquid alkali-free accelerator is characterized in that the thickener is one or a mixture of more of polyacrylamide, polyacrylic acid, AMPS polymer, carboxymethyl cellulose, hydroxyethyl cellulose, methyl hydroxyethyl cellulose and hydroxypropyl methyl cellulose.
The liquid alkali-free accelerator is characterized by being prepared at normal temperature, no additional heating is needed, and the liquid alkali-free accelerator is energy-saving and environment-friendly; 6-9% of doping amount, less than 5 minutes of initial setting time, less than 12 minutes of final setting time, 1-day strength greater than 7 MPa, and 28-day strength is not lost; good storage stability, no precipitation and no delamination after 3 months.
The liquid alkali-free accelerator provided by the invention realizes the rapid increase of the 1-day strength through the reinforcing agent, realizes the effective dispersion of the accelerator suspension through the dispersing agent, and improves the storage stability of the accelerator suspension through the organic alcohol amine carboxylic acid and the thickening agent.
Detailed Description
The present invention is further illustrated below with reference to specific examples, which are intended to be illustrative only and not to limit the scope of the invention. Various equivalent modifications of the invention, which fall within the scope of the appended claims of this application, will occur to persons skilled in the art.
Example 1
Weighing 1g of polycarboxylic acid water reducing agent and 24.5g of water, putting the polycarboxylic acid water reducing agent and the water into a reaction kettle, and stirring at a low speed until the bottom materials are completely dissolved, wherein the stirring speed is 50 revolutions per minute, and the stirring time is 5 minutes. 70g of aluminum sulfate was weighed and added to the base material while maintaining stirring at a speed of 50 rpm for 60 minutes. 2g of calcium formate was weighed out and added to the reaction kettle while maintaining stirring at a speed of 1000 rpm for 10 minutes. 2g of ethanolamine was weighed into the reaction vessel while maintaining stirring at a stirring speed of 1000 rpm for 5 minutes. 0.5g of polyacrylamide was weighed into the reaction vessel while maintaining stirring at 2000 rpm for 10 minutes. Standing for 30 minutes, starting stirring, wherein the stirring speed is 1500 rpm, the stirring time is 30 minutes, and obtaining the liquid alkali-free setting accelerator SNJ-1 after the stirring is finished.
Example 2
Weighing 1.5g of polycarboxylic acid water reducing agent and 22.5g of water, putting into a reaction kettle, and stirring at a low speed until the bottom materials are completely dissolved, wherein the stirring speed is 50 revolutions per minute, and the stirring time is 5 minutes. 65g of aluminium sulphate are weighed out and added into the base material while stirring is maintained, the stirring speed is 50 revolutions per minute, and the stirring time is 60 minutes. 5g of calcium acetate is weighed and added into the reaction kettle while stirring, wherein the stirring speed is 1000 revolutions per minute, and the stirring time is 10 minutes. 5g of triethanolamine is weighed and added into a reaction kettle, and stirring is kept at 1000 revolutions per minute for 5 minutes. 1.0g of carboxymethyl cellulose is weighed out and added into a reaction kettle, and stirring is kept at 2000 rpm and is carried out for 10 minutes. Standing for 30 minutes, starting stirring, wherein the stirring speed is 1500 rpm, the stirring time is 30 minutes, and obtaining the liquid alkali-free setting accelerator SNJ-2 after the stirring is finished.
Example 3
2.0g of naphthalene water reducer and 35.7g of water are weighed and put into a reaction kettle to be stirred at a low speed until the bottom materials are completely dissolved, wherein the stirring speed is 50 revolutions per minute, and the stirring time is 5 minutes. 55g of aluminum sulfate is weighed and added into the base material while stirring is kept, the stirring speed is 50 revolutions per minute, and the stirring time is 60 minutes. 1g of lithium carbonate is weighed and added into the reaction kettle while stirring is kept, wherein the stirring speed is 1000 revolutions per minute, and the stirring time is 10 minutes. 6g of diethanolamine is weighed and added into a reaction kettle, and stirring is kept at 1000 rpm for 5 minutes. 0.3g of methylhydroxyethyl cellulose is weighed into the reaction vessel while stirring is maintained at a speed of 2000 rpm for 10 minutes. Standing for 30 minutes, starting stirring, wherein the stirring speed is 1500 rpm, the stirring time is 30 minutes, and obtaining the liquid alkali-free accelerator SNJ-3 after the stirring is finished.
Example 4
5.0g of melamine water reducer and 36.2g of water are weighed and put into a reaction kettle to be stirred at a low speed until the bottom material is completely dissolved, wherein the stirring speed is 50 revolutions per minute, and the stirring time is 5 minutes. 45g of aluminum sulfate was weighed and added to the base material while maintaining stirring at a speed of 50 rpm for 60 minutes. 3g of lithium sulfate is weighed and added into a reaction kettle while stirring is kept, wherein the stirring speed is 1000 revolutions per minute, and the stirring time is 10 minutes. 10g of triisopropanolamine is weighed and added into the reaction kettle, and stirring is kept at the same time, wherein the stirring speed is 1000 revolutions per minute, and the stirring time is 5 minutes. 0.8g of hydroxypropyl methylcellulose was weighed into the reaction vessel while maintaining stirring at 2000 rpm for 10 minutes. Standing for 30 minutes, starting stirring, wherein the stirring speed is 1500 rpm, the stirring time is 30 minutes, and obtaining the liquid alkali-free setting accelerator SNJ-4 after the stirring is finished.
Application example
TABLE 1 stability of liquid alkali-free accelerators
| Numbering | 1 month | 2 months old | 3 months old | 4 months old | For 5 months | 6 months old |
| SNJ-1 | Stabilization | Stabilization | Stabilization | Stabilization | A small amount of supernatant appeared | |
| SNJ-2 | Stabilization | Stabilization | Stabilization | Stabilization | Stabilization | Stabilization |
| SNJ-3 | Stabilization | Stabilization | Stabilization | A small amount of supernatant appeared | ||
| SNJ-4 | Stabilization | Stabilization | Stabilization | Stabilization | Stabilization | A small amount of supernatant appeared |
The setting time and the 1-day strength were evaluated by the method prescribed in GB/T35159-2017 accelerating agent for shotcrete.
TABLE 2 Performance test data for liquid accelerators
| Application example | Mixing amount | Initial setting time | Final setting time | 1 day compressive strength/MPa |
| Commercial alkali-free accelerator | 7% | 06:30 | 14:20 | 6.0 |
| SNJ-1 | 7% | 04:00 | 11:00 | 7.5 |
| SNJ-2 | 7% | 01:30 | 05:40 | 11.6 |
| SNJ-3 | 7% | 02:40 | 07:50 | 10.4 |
| SNJ-4 | 7% | 03:10 | 08:10 | 9.3 |
As can be seen from the data in tables 1 and 2, the liquid alkali-free setting accelerator has good stability for 3 months, and the initial setting time, the final setting time and the 1-day compressive strength at the mixing amount of 7 percent all meet the national standard requirements.
Claims (8)
1. The liquid alkali-free accelerator is characterized by comprising the following raw materials in percentage by weight:
40-70% of aluminum sulfate;
1-5% of a reinforcing agent;
0.1 to 5 percent of dispersant;
0.1 to 1 percent of thickening agent;
0.1 to 10 percent of organic alcohol amine;
the balance of water, and the balance is 100 percent.
2. The liquid alkali-free accelerator according to claim 1, wherein the preparation method comprises the steps of:
1) weighing a certain amount of dispersing agent and water, placing the dispersing agent and the water into a reaction kettle, and stirring at a low speed until the bottom materials are completely dissolved, wherein the stirring speed is 10-100 revolutions per minute, and the stirring time is 5-10 minutes;
2) weighing a certain amount of aluminum sulfate, adding into the base material while keeping stirring at a stirring speed of 10-100 r/min for 30-60 min;
3) weighing a certain amount of reinforcing agent, adding the reinforcing agent into a reaction kettle, and simultaneously keeping stirring, wherein the stirring speed is 1000-3000 r/min, and the stirring time is 10-30 min;
4) weighing a certain amount of organic alcohol amine, adding the organic alcohol amine into a reaction kettle, and simultaneously keeping stirring, wherein the stirring speed is 1000-3000 r/min, and the stirring time is 5-10 min;
5) weighing a certain amount of thickening agent, adding the thickening agent into a reaction kettle, and simultaneously keeping stirring, wherein the stirring speed is 1000-3000 r/min, and the stirring time is 10-30 min;
6) standing for 30-600 minutes, starting stirring at the speed of 1000-3000 r/min for 10-30 minutes; and (5) obtaining the liquid alkali-free setting accelerator after stirring.
3. The liquid alkali-free accelerator according to claim 1, wherein the aluminum sulfate is aluminum sulfate octadecahydrate, wherein the alumina content is not less than 17%.
4. The liquid alkali-free accelerator according to claim 1, wherein the enhancer is one or a mixture of lithium sulfate, lithium carbonate, calcium formate, calcium acetate and magnesium sulfate.
5. The liquid alkali-free accelerator according to claim 1, wherein the dispersant is one or a mixture of a plurality of polycarboxylic acid water reducer, naphthalene water reducer and melamine water reducer.
6. The liquid alkali-free accelerator according to claim 1, wherein the organic alcohol amine is one or a mixture of more of ethanolamine, diethanolamine, triethanolamine, ethylene glycol monoisopropanolamine and triisopropanolamine.
7. The liquid alkali-free accelerator according to claim 1, wherein the thickener is one or a mixture of several of polyacrylamide, polyacrylic acid, AMPS polymer, carboxymethyl cellulose, hydroxyethyl cellulose, methyl hydroxyethyl cellulose and hydroxypropyl methyl cellulose.
8. The liquid alkali-free accelerator according to claim 1, which is prepared at normal temperature, does not need additional heating, and is energy-saving and environment-friendly; 6-9% of doping amount, less than 5 minutes of initial setting time, less than 12 minutes of final setting time, 1-day strength greater than 7 MPa, and 28-day strength is not lost; good storage stability, no precipitation and no delamination after 3 months.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011221495.2A CN112194408A (en) | 2020-11-05 | 2020-11-05 | Liquid alkali-free accelerator and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011221495.2A CN112194408A (en) | 2020-11-05 | 2020-11-05 | Liquid alkali-free accelerator and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112194408A true CN112194408A (en) | 2021-01-08 |
Family
ID=74033301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011221495.2A Pending CN112194408A (en) | 2020-11-05 | 2020-11-05 | Liquid alkali-free accelerator and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112194408A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113121146A (en) * | 2021-04-16 | 2021-07-16 | 厦门欣润岩新材料有限公司 | Alkali-free accelerator and preparation method thereof |
| CN113185177A (en) * | 2021-05-14 | 2021-07-30 | 山西佳维新材料股份有限公司 | Alkali-free fluorine-free chlorine-free accelerator and preparation method and application thereof |
| CN113213805A (en) * | 2021-03-31 | 2021-08-06 | 山西佳维新材料股份有限公司 | Quick early-strength alkali-free fluorine-free chlorine-free liquid accelerator and preparation method thereof |
| 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 |
| CN114702275A (en) * | 2022-02-11 | 2022-07-05 | 安徽理工大学 | Method for improving early strength performance of cement |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107586054A (en) * | 2017-09-06 | 2018-01-16 | 江苏尼高科技有限公司 | Gunite concrete alkali-free liquid accelerator and preparation method thereof |
-
2020
- 2020-11-05 CN CN202011221495.2A patent/CN112194408A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107586054A (en) * | 2017-09-06 | 2018-01-16 | 江苏尼高科技有限公司 | Gunite concrete alkali-free liquid accelerator and preparation method thereof |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113213805A (en) * | 2021-03-31 | 2021-08-06 | 山西佳维新材料股份有限公司 | Quick early-strength alkali-free fluorine-free chlorine-free liquid accelerator and preparation method thereof |
| CN113121146A (en) * | 2021-04-16 | 2021-07-16 | 厦门欣润岩新材料有限公司 | Alkali-free accelerator and preparation method thereof |
| CN113185177A (en) * | 2021-05-14 | 2021-07-30 | 山西佳维新材料股份有限公司 | Alkali-free fluorine-free chlorine-free accelerator and preparation method and application thereof |
| 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 |
| CN114702275A (en) * | 2022-02-11 | 2022-07-05 | 安徽理工大学 | Method for improving early strength performance of cement |
| CN114702275B (en) * | 2022-02-11 | 2022-09-09 | 安徽理工大学 | Method for improving early strength performance of cement |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112194408A (en) | Liquid alkali-free accelerator and preparation method thereof | |
| CN110078406B (en) | Liquid alkali-free accelerator and preparation method thereof | |
| CN108911567B (en) | Special additive for high-strength concrete and preparation method thereof | |
| CN107352836B (en) | Superpower nucleus of ultra early-strength concrete admixture and preparation method thereof | |
| CN107010890B (en) | Environment-friendly polymer cement wall waterproof slurry and preparation method thereof | |
| CN109665743B (en) | Marble stone powder-based concrete admixture capable of reducing water bleeding and preparation method thereof | |
| CN110734245A (en) | Hydration heat inhibition type concrete anti-cracking waterproof agent, preparation method and application thereof | |
| CN110963732A (en) | Environment-friendly alkali-free liquid accelerator and normal-temperature preparation method thereof | |
| CN108046651B (en) | Concrete super retarder | |
| CN112047661A (en) | Recycled aggregate concrete additive | |
| CN112028522B (en) | Low-alkali liquid accelerator and preparation method thereof | |
| CN111362616A (en) | Concrete water reducing agent and preparation method thereof | |
| CN113979666B (en) | Double-doped wet-mixed mortar additive | |
| CN111777367A (en) | Waterproof repair mortar for building wall and preparation method thereof | |
| CN113233816B (en) | Reinforced wet-mixed mortar additive | |
| CN114685081A (en) | Liquid alkali-free accelerator and preparation method thereof | |
| CN111646743A (en) | Bonding mortar for bonding smooth interface and preparation method thereof | |
| CN114195424B (en) | Waterproof anti-crack concrete additive and preparation method thereof | |
| CN111116092B (en) | Environment-friendly concrete reinforcing agent and preparation method thereof | |
| CN110790524B (en) | Steel slag acidic vertical grinding agent and preparation and application thereof | |
| CN102976658B (en) | Special additive for water-permeable concrete and preparation method of special additive | |
| CN111606597A (en) | Polycarboxylic acid series concrete water reducing agent and production method thereof | |
| CN106316195A (en) | Reinforced cement grinding aid and cement thereof | |
| CN111704413A (en) | Concrete prepared from waste slurry of concrete mixing plant | |
| CN104891890A (en) | Ceramic tile adhesive |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210108 |
|
| WD01 | Invention patent application deemed withdrawn after publication |