CN108751765B - Phosphate cement retarder and using method thereof - Google Patents
Phosphate cement retarder and using method thereof Download PDFInfo
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- CN108751765B CN108751765B CN201810775604.1A CN201810775604A CN108751765B CN 108751765 B CN108751765 B CN 108751765B CN 201810775604 A CN201810775604 A CN 201810775604A CN 108751765 B CN108751765 B CN 108751765B
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- phosphate
- phosphate cement
- retarder
- dodecahydrate
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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
- C04B12/00—Cements not provided for in groups C04B7/00 - C04B11/00
- C04B12/02—Phosphate cements
- C04B12/025—Phosphates of ammonium or of the alkali or alkaline earth metals
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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
- C04B2103/20—Retarders
- C04B2103/22—Set retarders
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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)
Abstract
The invention discloses a phosphate cement retarder and a using method thereof, wherein the retarder comprises the following components in percentage by mass: 80-95% of ferric sulfate dodecahydrate, 1-10% of sodium sulfate decahydrate and 1-10% of trisodium phosphate dodecahydrate, wherein the sum of the components is 100%; the preparation method comprises the following steps: 1) uniformly mixing ferric sulfate dodecahydrate, sodium sulfate decahydrate and trisodium phosphate dodecahydrate according to the proportion to obtain a phosphate cement retarder; 2) the phosphate cement retarder is added into the phosphate cement, and water is added for use after uniform mixing. The phosphate cement retarder provided by the invention can effectively prolong the setting time for 14-60 min, can reduce the loss of fluidity of phosphate slurry over time, has small influence on the early compressive strength, and meets the requirement of construction operability.
Description
Technical Field
The invention relates to a phosphate cement retarder and a using method thereof, belonging to the technical field of phosphate cement additives.
Background
The phosphate cement (MPC) is prepared from over-burnt magnesia, phosphoric acid or acid phosphate and coagulation regulating material according to a certain proportion. Magnesium phosphate cement is mixed with water and reacts to give a material with a highly crystalline structure, and is therefore also referred to as a "chemically bonded magnesium phosphate ceramic". MPC has the following technical performance characteristics: rapid setting and hardening, high early strength, strong bonding capability and excellent durability, and can be set and hardened in a low-temperature environment of 20 +/-5 ℃. In the 20 th century, 80 s, western countries such as the United states and the like utilize the characteristics of rapid hardening and high strength of magnesium phosphate cement, and the magnesium phosphate cement is widely used for repairing and rush-repairing civil buildings such as airfield runways, bridges, roads and the like and military engineering, and is also used as a coating material for precision casting, dental cement, a bone adhesive and the like. The hydration reaction of magnesium phosphate cement is essentially an acid-base neutralization reaction, so that the reaction is rapid, a large amount of heat is released, rapid coagulation usually occurs within minutes, certain strength is generated within half an hour, and the early strength is high. Therefore, magnesium phosphate cement can be rapidly set at low temperature. In addition, the magnesium phosphate cement has the characteristics of good bonding performance with old concrete, good wear resistance, good frost resistance and small drying shrinkage.
Effective control of the setting time is critical in the art of MPC preparation. The method mainly comprises the steps of adjusting the activity and the specific surface area of magnesium oxide, controlling the phosphate amount, adding a retarder, cooling and mixing water, controlling the pH value of MPC slurry and the dissolution of magnesium oxide, and the like, wherein the effective retarding technology is adding retarder borate and chloride. However, the use effect of the retarder is not ideal, and problems such as: when the mixing amount of the borate is small, the delayed coagulation effect is not obvious, and when the mixing amount is large, the later strength and the water resistance of the MPC are both adversely affected; the following steps are repeated: the strength of phosphate cement is greatly influenced after the chloride is doped, and the safety of the structure is influenced because the chloride ions cause corrosion of reinforcing steel bars when the chloride ions are used in the structure with the reinforcing steel bars.
Disclosure of Invention
The technical problem is as follows: the invention aims to provide a phosphate cement retarder and a using method thereof, wherein the retarder can effectively prolong the setting time of phosphate cement at low mixing amount on the premise of not influencing the working performance and the strength, and meets the requirement of construction operability.
The technical scheme is as follows: the invention provides a phosphate cement retarder which comprises the following components in percentage by mass:
ferric sulfate dodecahydrate 80-95%
Sodium sulfate decahydrate 1-10%
1 to 10 percent of trisodium phosphate dodecahydrate
The sum of the above components is 100%.
Wherein:
the phosphate cement retarder is powdery, and the particle size of the phosphate cement retarder is 20-200 mu m.
The sodium sulfate decahydrate is colorless monoclinic crystalline powder, and the purity of the sodium sulfate decahydrate is more than or equal to 98.0 wt%.
The ferric sulfate dodecahydrate is light purple octahedral crystal powder with purity not less than 99.0 wt%.
The trisodium phosphate dodecahydrate is colorless or white crystalline powder, and the purity of the trisodium phosphate dodecahydrate is more than or equal to 99.0 wt%.
The invention also provides a use method of the phosphate cement retarder, which comprises the following steps:
1) uniformly mixing ferric sulfate dodecahydrate, sodium sulfate decahydrate and trisodium phosphate dodecahydrate according to the proportion to obtain a phosphate cement retarder;
2) the phosphate cement retarder is added into the phosphate cement, and water is added for use after uniform mixing.
Wherein:
the phosphate cement contains magnesium oxide, monopotassium phosphate and borax.
The mass ratio of magnesium oxide to potassium dihydrogen phosphate in the phosphate cement is 2-3; the borax accounts for 5-10% of the total mass of magnesium oxide and potassium dihydrogen phosphate in the phosphate cement.
The phosphate cement retarder is added into the phosphate cement, and the mass of the phosphate cement retarder is 2.5-10% of the total mass of magnesium oxide and monopotassium phosphate in the phosphate cement.
The phosphate cement retarder is added into the phosphate cement, water is added after the phosphate cement retarder is uniformly mixed, and the ratio of the mass of the water to the total mass of the magnesium oxide, the monopotassium phosphate, the borax and the phosphate cement retarder is 0.14-0.30.
Has the advantages that: compared with the prior art, the invention has the following advantages:
1) compared with the existing effective retarding technologies such as retarder borate and chloride salt, the phosphate retarder can effectively prolong the setting time of phosphate cement at low dosage on the premise of not influencing the working performance and strength, and meets the requirement of construction operability.
2) Compared with the phosphate cement which is greatly influenced by the strength after the chloride is doped, and because of the existence of chloride ions, if the phosphate retarder is used in a structure with reinforcing steel bars, the reinforcing steel bars are corroded to influence the structure safety, the phosphate retarder disclosed by the invention does not contain chloride ions, and therefore, the phosphate retarder can be widely applied to structural members with reinforcing steel bars.
Detailed Description
The invention discloses a phosphate cement retarder and a using method thereof, wherein the phosphate cement retarder is a composite additive which can effectively prolong the setting time of phosphate cement and does not influence other working performance and strength; the following examples are given by way of illustration.
Example 1
A phosphate cement retarder comprises the following components in percentage by mass:
ferric sulfate dodecahydrate 95%
Sodium sulfate decahydrate 4%
Trisodium phosphate dodecahydrate 1%.
Wherein:
the phosphate cement retarder is powdery, and the particle size of the powder is 20-200 mu m.
The sodium sulfate decahydrate is colorless monoclinic crystal system crystalline powder, and the purity of the sodium sulfate decahydrate is more than or equal to 98.0 wt%.
The ferric sulfate dodecahydrate is light purple octahedral crystal powder with purity not less than 99.0 wt%.
The trisodium phosphate dodecahydrate is colorless or white crystalline powder, and the purity of the crystalline powder is more than or equal to 99.0 wt%.
A method of using a phosphate cement retarder, comprising the steps of:
1) uniformly mixing ferric sulfate dodecahydrate, sodium sulfate decahydrate and trisodium phosphate dodecahydrate according to the proportion to obtain a phosphate cement retarder;
2) the phosphate cement retarder is added into the phosphate cement, and water is added for use after uniform mixing.
Specific parameter ratios are shown in table 1, for example:
TABLE 1
In table 1: the addition amount/% "of the additive is the ratio of the mass of the retarder of the phosphate cement to the total mass of magnesium oxide and potassium dihydrogen phosphate in the phosphate cement; "M: p' is the mass ratio of magnesium oxide to potassium dihydrogen phosphate; the 'water-cement ratio' is the ratio of the mass of water to the total mass of the magnesium oxide, the monopotassium phosphate, the borax and the phosphate cement retarder; the borax doping amount/% "is the ratio of the mass of borax to the total mass of magnesium oxide and potassium dihydrogen phosphate in phosphate cement; the fluidity test refers to GB/T50448-; the setting time and strength tests are referred to GB/T17671-1999 Cement mortar Strength test method (ISO method).
Example 2
A phosphate cement retarder comprises the following components in percentage by mass:
ferric sulfate dodecahydrate 80%
Sodium sulfate decahydrate 10%
Trisodium phosphate dodecahydrate 10%.
Wherein:
the phosphate cement retarder is powdery, and the particle size of the powder is 20-200 mu m.
The sodium sulfate decahydrate is colorless monoclinic crystal system crystalline powder, and the purity of the sodium sulfate decahydrate is more than or equal to 98.0 wt%.
The ferric sulfate dodecahydrate is light purple octahedral crystal powder with purity not less than 99.0 wt%.
The trisodium phosphate dodecahydrate is colorless or white crystalline powder, and the purity of the crystalline powder is more than or equal to 99.0 wt%.
A method of using a phosphate cement retarder, comprising the steps of:
1) uniformly mixing ferric sulfate dodecahydrate, sodium sulfate decahydrate and trisodium phosphate dodecahydrate according to the proportion to obtain a phosphate cement retarder;
2) the phosphate cement retarder is added into the phosphate cement, and water is added for use after uniform mixing.
Specific parameter ratios are shown in table 2, for example:
TABLE 2
In table 2: the addition amount/% "of the additive is the ratio of the mass of the retarder of the phosphate cement to the total mass of magnesium oxide and potassium dihydrogen phosphate in the phosphate cement; "M: p' is the mass ratio of magnesium oxide to potassium dihydrogen phosphate; the 'water-cement ratio' is the ratio of the mass of water to the total mass of the magnesium oxide, the monopotassium phosphate, the borax and the phosphate cement retarder; the borax doping amount/% "is the ratio of the mass of borax to the total mass of magnesium oxide and potassium dihydrogen phosphate in phosphate cement; the fluidity test refers to GB/T50448-; the setting time and strength tests are referred to GB/T17671-1999 Cement mortar Strength test method (ISO method).
Example 3
A phosphate cement retarder comprises the following components in percentage by mass:
ferric sulfate dodecahydrate 90%
Sodium sulfate decahydrate 5%
Trisodium phosphate dodecahydrate 5%.
Wherein:
the phosphate cement retarder is powdery, and the particle size of the powder is 20-200 mu m.
The sodium sulfate decahydrate is colorless monoclinic crystal system crystalline powder, and the purity of the sodium sulfate decahydrate is more than or equal to 98.0 percent by weight.
The ferric sulfate dodecahydrate is light purple octahedral crystal powder with purity not less than 99.0 wt%.
The trisodium phosphate dodecahydrate is colorless or white crystalline powder, and the purity of the crystalline powder is more than or equal to 99.0 percent by weight.
A method of using a phosphate cement retarder, comprising the steps of:
1) uniformly mixing ferric sulfate dodecahydrate, sodium sulfate decahydrate and trisodium phosphate dodecahydrate according to the proportion to obtain a phosphate cement retarder;
2) the phosphate cement retarder is added into the phosphate cement, and water is added for use after uniform mixing.
Specific parameter ratios are shown in table 3, for example:
TABLE 3
In table 3: the addition amount/% "of the additive is the ratio of the mass of the retarder of the phosphate cement to the total mass of magnesium oxide and potassium dihydrogen phosphate in the phosphate cement; "M: p' is the mass ratio of magnesium oxide to potassium dihydrogen phosphate; the 'water-cement ratio' is the ratio of the mass of water to the total mass of the magnesium oxide, the monopotassium phosphate, the borax and the phosphate cement retarder; the borax doping amount/% "is the ratio of the mass of borax to the total mass of magnesium oxide and potassium dihydrogen phosphate in phosphate cement; the fluidity test refers to GB/T50448-; the setting time and strength tests are referred to GB/T17671-1999 Cement mortar Strength test method (ISO method).
Example 4
A phosphate cement retarder comprises the following components in percentage by mass:
89% of ferric sulfate dodecahydrate
Sodium sulfate decahydrate 1%
Trisodium phosphate dodecahydrate 10%.
Wherein:
the phosphate cement retarder is powdery, and the particle size of the powder is 20-200 mu m.
The sodium sulfate decahydrate is colorless monoclinic crystal system crystalline powder, and the purity of the sodium sulfate decahydrate is more than or equal to 98.0 percent by weight.
The ferric sulfate dodecahydrate is light purple octahedral crystal powder with purity not less than 99.0 wt%.
The trisodium phosphate dodecahydrate is colorless or white crystalline powder, and the purity of the crystalline powder is more than or equal to 99.0 percent by weight.
A method of using a phosphate cement retarder, comprising the steps of:
1) uniformly mixing ferric sulfate dodecahydrate, sodium sulfate decahydrate and trisodium phosphate dodecahydrate according to the proportion to obtain a phosphate cement retarder;
2) the phosphate cement retarder is added into the phosphate cement, and water is added for use after uniform mixing.
Specific parameter ratios are shown in table 4, for example:
TABLE 4
In table 4: the addition amount/% "of the additive is the ratio of the mass of the retarder of the phosphate cement to the total mass of magnesium oxide and potassium dihydrogen phosphate in the phosphate cement; "M: p' is the mass ratio of magnesium oxide to potassium dihydrogen phosphate; the 'water-cement ratio' is the ratio of the mass of water to the total mass of the magnesium oxide, the monopotassium phosphate, the borax and the phosphate cement retarder; the borax doping amount/% "is the ratio of the mass of borax to the total mass of magnesium oxide and potassium dihydrogen phosphate in phosphate cement; the fluidity test refers to GB/T50448-; the setting time and strength tests are referred to GB/T17671-1999 Cement mortar Strength test method (ISO method).
Claims (10)
1. A phosphate cement retarder, which is characterized in that: the retarder comprises the following components in percentage by mass:
80 to 95 percent of ferric sulfate dodecahydrate;
1 to 10 percent of sodium sulfate decahydrate;
1 to 10 percent of trisodium phosphate dodecahydrate;
the sum of the above components is 100%.
2. A phosphate cement set retarder according to claim 1, characterized in that: the phosphate cement retarder is powdery, and the particle size of the phosphate cement retarder is 20-200 mu m.
3. A phosphate cement set retarder according to claim 1, characterized in that: the sodium sulfate decahydrate is colorless monoclinic crystalline powder, and the purity of the sodium sulfate decahydrate is more than or equal to 98.0 wt%.
4. The phosphate cement retarder of claim 1, wherein: the ferric sulfate dodecahydrate is light purple octahedral crystal powder with purity not less than 99.0 wt%.
5. The phosphate cement retarder of claim 1, wherein: the trisodium phosphate dodecahydrate is colorless or white crystalline powder, and the purity of the trisodium phosphate dodecahydrate is more than or equal to 99.0 wt%.
6. A method of using the phosphate cement retarder of claim 1, wherein: the method comprises the following steps:
1) uniformly mixing ferric sulfate dodecahydrate, sodium sulfate decahydrate and trisodium phosphate dodecahydrate according to the proportion to obtain a phosphate cement retarder;
2) the phosphate cement retarder is added into the phosphate cement, and water is added for use after uniform mixing.
7. The method of using a phosphate cement retarder according to claim 6, wherein: the phosphate cement contains magnesium oxide, monopotassium phosphate and borax.
8. The method of using a phosphate cement retarder according to claim 7, wherein: the mass ratio of magnesium oxide to potassium dihydrogen phosphate in the phosphate cement is 2-3; the borax accounts for 5-10% of the total mass of magnesium oxide and potassium dihydrogen phosphate in the phosphate cement.
9. The method of using a phosphate cement retarder according to claim 7, wherein: the phosphate cement retarder is added into the phosphate cement, and the mass of the phosphate cement retarder is 2.5-10% of the total mass of magnesium oxide and monopotassium phosphate in the phosphate cement.
10. The method of using a phosphate cement retarder according to claim 7, wherein: the phosphate cement retarder is added into the phosphate cement, water is added after the phosphate cement retarder is uniformly mixed, and the ratio of the mass of the water to the total mass of the magnesium oxide, the monopotassium phosphate, the borax and the phosphate cement retarder is 0.14-0.30.
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| CN109796147B (en) * | 2019-03-05 | 2021-09-28 | 东南大学 | Rapid repairing material for magnesium phosphate cement and preparation method thereof |
| CN113149498A (en) * | 2021-03-21 | 2021-07-23 | 苏州诚开新材料有限公司 | Composite retarder, preparation method thereof and application thereof in magnesium ammonium phosphate cement |
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| CN1107125A (en) * | 1994-06-17 | 1995-08-23 | 北京工业大学 | Early strengthening agent for concrete |
| RU2005102757A (en) * | 2005-02-07 | 2006-07-20 | Александр Михайлович Власенко (RU) | CHEMICAL ADDITIVE FOR CEMENT CONCRETE AND BUILDING SOLUTIONS |
| EP2380850A1 (en) * | 2009-01-08 | 2011-10-26 | Hailisheng Pharmaceutical Co., Ltd | Modified sodium-montmorillonite, preparing method and uses thereof |
| CN104276780A (en) * | 2014-09-05 | 2015-01-14 | 青岛佳尚创意文化有限公司 | Concrete retarder |
| CN105198273A (en) * | 2015-11-02 | 2015-12-30 | 宋介珍 | Concrete compound type chloride-free early strength agent and preparation method thereof |
| CN105924027A (en) * | 2016-04-23 | 2016-09-07 | 徐玉仙 | Cement retarder |
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2018
- 2018-07-16 CN CN201810775604.1A patent/CN108751765B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1107125A (en) * | 1994-06-17 | 1995-08-23 | 北京工业大学 | Early strengthening agent for concrete |
| RU2005102757A (en) * | 2005-02-07 | 2006-07-20 | Александр Михайлович Власенко (RU) | CHEMICAL ADDITIVE FOR CEMENT CONCRETE AND BUILDING SOLUTIONS |
| EP2380850A1 (en) * | 2009-01-08 | 2011-10-26 | Hailisheng Pharmaceutical Co., Ltd | Modified sodium-montmorillonite, preparing method and uses thereof |
| CN104276780A (en) * | 2014-09-05 | 2015-01-14 | 青岛佳尚创意文化有限公司 | Concrete retarder |
| CN105198273A (en) * | 2015-11-02 | 2015-12-30 | 宋介珍 | Concrete compound type chloride-free early strength agent and preparation method thereof |
| CN105924027A (en) * | 2016-04-23 | 2016-09-07 | 徐玉仙 | Cement retarder |
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