CN105645914A - MPC (magnesium phosphate cement) doped with PCMs (phase-change materials) - Google Patents
MPC (magnesium phosphate cement) doped with PCMs (phase-change materials) Download PDFInfo
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- CN105645914A CN105645914A CN201610095371.1A CN201610095371A CN105645914A CN 105645914 A CN105645914 A CN 105645914A CN 201610095371 A CN201610095371 A CN 201610095371A CN 105645914 A CN105645914 A CN 105645914A
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- phase
- change material
- magnesium phosphate
- phosphate cement
- transition temperature
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/34—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
Abstract
The invention discloses MPC (magnesium phosphate cement) doped with PCMs (phase-change materials) and belongs to the technical field of building materials. The prepared MPC can be applied to the technical filed of structure repair and reinforcement. The MPC comprises main components and phase-change components, wherein the main components comprise 70%-85% of the MPC, 5%-10% of gypsum and 10%-20% of fly ash; the phase-change components comprise components in percentage by mass as follows: 5%-10% of a PCM at the phase-change temperature of 20-25 DEG C, 5%-10% of a PCM at the phase-change temperature of 30-35 DEG C and 5%-10% of a PCM at the phase-change temperature of 35-45 DEG C. According to phase change of the PCMs in different phase change intervals at different temperature intervals, heat emitted through hydration of the MPC is absorbed, the reaction rate is slowed down, and the setting time of the MPC is improved. The setting time is well controlled while the requirement for strength is met, and the MPC has very large application space.
Description
Technical field
The invention belongs to building material technical field, can be used for structure repair and reinforcement technique field.
Background technology
Magnesium phosphate cement (MPC) is the novel inorganic patching material of a kind of early-strong-fast-hard. It is phosphate anion fast reaction magnesian with burning in acid condition that magnesium phosphate cement condenses the ultimate principle of hardening. Through development for many years, applying maximum mainly has potassium magnesium phosphate cement, ammoniomagnesium phosphate cement and Phosphosilicate cement three major types. At present, the research of magnesium phosphate cement is still immature, and the setting time that main problem is magnesium phosphate cement is too short, and the large volume seriously limiting magnesium phosphate cement is repaired.
The setting time of magnesium phosphate cement is too short, and inner material aquation belongs to acid-base neutralization reaction, and during reaction, liberated heat further speeds up the carrying out of reaction. For solving rapid hardening problem, the method currently mainly taked is to add Borax, but Borax addition too much can affect the intensity of magnesium phosphate cement. So far, but without the high-efficient retarder developing applicable magnesium phosphate cement, cause the slow setting time of magnesium phosphate cement to be substantially all within 10min, the application of magnesium phosphate cement is had very big limitation. For solving the problems referred to above, the present invention proposes by filling the method that phase-change material regulates magnesium phosphate cement setting time, the method is undergone phase transition in different temperatures interval by phase-change material, slow down the lasting rising of magnesium phosphate cement internal temperature, the setting time of magnesium phosphate cement can be controlled very well, make magnesium phosphate cement range of application more extensive.
Summary of the invention
The technical barrier that the invention solves the problems that is: for the problem that magnesium phosphate cement setting time is too short, by filling the method that phase-change material regulates magnesium phosphate cement setting time. Specifically include material composition (the material composition of key component and phase transformation component and mass percent) and preparation method:
1. key component forms and measures as follows by mass percentage
(1) magnesium phosphate cement: 70%-85%;
(2) Gypsum Fibrosum: 5%-10%;
(3) flyash: 10%-20%;
2. phase transformation component composition and to account for the mass percent of Main Components as follows:
(1) a kind of phase transition temperature at the phase-change material of 20-25 DEG C (by CaCl2��6H2O, NaCl and Na2B4O7��10H2O forms): 5%-10%;
(2) a kind of phase transition temperature at the phase-change material of 30-35 DEG C (by Ca (NO3)2��4H2O��Mg(NO3)2��6H2And Na2B4O7��10H2O forms): 5%-10%;
(3) a kind of phase transition temperature at the phase-change material of 35-45 DEG C (by Na2B4O7��10H2O��Na2HPO��12H2O and CaCl2��6H2O forms): 5%-10%;
Described magnesium phosphate cement is the homogeneous mixture that mol ratio is 4.5/1 of 1600 DEG C of grain magnesites and PHOSPHORIC ACID TECH.GRADE potassium dihydrogen.
Described Gypsum Fibrosum is ardealite, specific surface area 250��350m2/kg��
Described flyash is circulating fluid bed coal ash, specific surface area 700m2/ more than kg.
Described phase-change material is:
1. a kind of phase transition temperature at the phase-change material of 20-25 DEG C by 89%CaCl2��6H2O+6%NaCl+5%Na2B4O7��10H2O forms;
2. a kind of phase transition temperature at the phase-change material of 30-35 DEG C by 62%Ca (NO3)2��4H2O+21%Mg (NO3)2��6H2O+17%Na2B4O7��10H2O forms;
3. a kind of phase transition temperature at the phase-change material of 35-45 DEG C by 20%Na2B4O7��10H2O+60%Na2HPO4��12H2O+20%CaCl 6H2O forms;
Preparation process is as follows:
Flyash is mixed homogeneously by the proportion requirement of key component and phase transformation component with Gypsum Fibrosum, magnesium phosphate cement and phase-change material in blender, obtains described phase transformation magnesium phosphate cement.
Detailed description of the invention
For embodying the effect of the present invention further, below in conjunction with concrete application case, the present invention is described in more detail.
Described magnesium phosphate cement is the homogeneous mixture that mol ratio is 4.5/1 of 1600 DEG C of grain magnesites and PHOSPHORIC ACID TECH.GRADE potassium dihydrogen.
Described Gypsum Fibrosum is ardealite, specific surface area 250��350m2/kg��
Described flyash is circulating fluid bed coal ash, specific surface area 700m2/ more than kg.
Phase transition temperature at the phase-change material of 20-25 DEG C by 89%CaCl2��6H2O+6%NaCl+5%Na2B4O7��10H2O forms;
The phase-change material of phase transition temperature 30-35 DEG C by
62%Ca (NO3)2��4H2O+21%Mg (NO3)2��6H2O+17%Na2B4O7��10H2O forms;
Phase transition temperature 35-45 DEG C phase-change material by
20%Na2B4O7��10H2O+60%Na2HPO4��12H2O+20%CaCl 6H2O forms;
But the present invention is not limited to above-mentioned selection.
Example 1:
The formula of a kind of phase transformation magnesium phosphate cement and preparation method, including key component and phase transformation component, amount is as follows by mass percentage:
(1) key component
(1) magnesium phosphate cement: 70%;
(2) ardealite: 10%;
(3) flyash: 20%;
(2) phase transformation component
(1) a kind of phase transition temperature is at the phase-change material of 20 DEG C-25 DEG C: 5% (percentage ratio with key component quality sum);
(2) a kind of phase transition temperature is at the phase-change material of 30 DEG C-35 DEG C: 10% (percentage ratio with key component quality sum);
(3) a kind of phase transition temperature is at the phase-change material of 35 DEG C-45 DEG C: 5% (percentage ratio with key component quality sum);
By above-mentioned load weighted key component and phase transformation component according to the step mix homogeneously of preparation technology, obtain the magnesium phosphate cement of example 1.
Example 2:
The formula of a kind of phase transformation magnesium phosphate cement and preparation method, including key component and phase transformation component, amount is as follows by mass percentage:
(1) key component
(1) magnesium phosphate cement: 85%;
(2) ardealite: 5%;
(3) flyash: 10%
(2) phase transformation component
(1) a kind of phase transition temperature is at the phase-change material of 20 DEG C-25 DEG C: 9% (percentage ratio with key component quality sum);
(2) a kind of phase transition temperature is at the phase-change material of 30 DEG C-35 DEG C: 7% (percentage ratio with key component quality sum);
(3) a kind of phase transition temperature is at the phase-change material of 35 DEG C-45 DEG C: 10% (percentage ratio with key component quality sum);
By above-mentioned load weighted key component and phase transformation component according to the step mix homogeneously of preparation technology, obtain the magnesium phosphate cement of example 2.
Example 3:
The formula of a kind of phase transformation magnesium phosphate cement and preparation method, including key component and phase transformation component, amount is as follows by mass percentage:
(1) key component
(1) magnesium phosphate cement: 75%;
(2) ardealite: 7%;
(3) flyash: 18%;
(2) phase transformation component
(1) a kind of phase transition temperature is at the phase-change material of 20 DEG C-25 DEG C: 7% (percentage ratio with key component quality sum);
(2) a kind of phase transition temperature is at the phase-change material of 30 DEG C-35 DEG C: 9% (percentage ratio with key component quality sum);
(3) a kind of phase transition temperature is at the phase-change material of 35 DEG C-45 DEG C: 7% (percentage ratio with key component quality sum);
By above-mentioned load weighted key component and phase transformation component according to the step mix homogeneously of preparation technology, obtain the magnesium phosphate cement of example 3.
Example 4:
The formula of a kind of phase transformation magnesium phosphate cement and preparation method, including key component and phase transformation component, amount is as follows by mass percentage:
(1) key component
(1) magnesium phosphate cement: 80%;
(2) ardealite: 9%;
(3) flyash: 11%;
(2) phase transformation component
(1) a kind of phase transition temperature is at the phase-change material of 20 DEG C-25 DEG C: 10% (percentage ratio with key component quality sum);
(2) a kind of phase transition temperature is at the phase-change material of 30 DEG C-35 DEG C: 5% (percentage ratio with key component quality sum);
(3) a kind of phase transition temperature is at the phase-change material of 35 DEG C-45 DEG C: 9% (percentage ratio with key component quality sum);
By above-mentioned load weighted key component and phase transformation component according to the step mix homogeneously of preparation technology, obtain the magnesium phosphate cement of example 4.
Experimental result
By above-mentioned experimental group respectively according to the setting time of GB/T1346-2001 " cement normal consistency water consumption stability and setting time " determination experiment group; The comprcssive strength of different experiments group is measured according to GB/T17671-1999 " strength of cement mortar detection method (ISO method) ". Test result is as shown in Table 1 and Table 2.
(1) result setting time
Magnesium phosphate cement result setting time of example 1-4 is as shown in table 1.
The setting time (min) of table 1 magnesium phosphate cement
| Group number | Example 1 | Example 2 | Example 3 | Example 4 |
| Initial set | 25 | 33 | 27 | 30 |
| Final set | 36 | 47 | 39 | 42 |
As shown in Table 1, the presetting period of the phase transformation magnesium phosphate cement prepared according to the method is all more than 20min, the wherein slow setting time optimal of example 2, improve short problem magnesium phosphate cement setting time well, magnesium phosphate cement construction application level is had very big lifting.
(2) the resistance to compression result of example 1-4 magnesium phosphate cement
The comprcssive strength (MPa) of table 2 magnesium phosphate cement
As shown in Table 2, example 1-4 is ensureing on the basis of slow setting time, and 1h intensity all can reach more than 20MPa, 1d intensity all at more than 35MPa, and later strength development is normal. Magnesium phosphate cement intensity is not caused damage by the prolongation of setting time.
In sum, the formula of phase transformation magnesium phosphate cement provided by the invention and preparation method, do not affect the basis of magnesium phosphate cement strength development well improves magnesium phosphate cement problem setting time, there is significantly high popularization and practical value.
Claims (6)
1. the magnesium phosphate cement filling phase-change material, it is characterised in that include key component and phase transformation component:
Key component composition and by mass percentage amount are as follows
(1) magnesium phosphate cement: 70%-85%;
(2) Gypsum Fibrosum: 5%-10%;
(3) flyash: 10%-20%, three of the above Ingredient percent sum is 100%;
Phase transformation component includes following three kinds, according to as follows with the mass percent of Main Components sum:
(1) a kind of phase transition temperature is at the phase-change material 5%-10% of 20-25 DEG C;
(2) a kind of phase transition temperature is at the phase-change material 5%-10% of 30-35 DEG C;
(3) a kind of phase transition temperature is at the phase-change material 5%-10% of 35-45 DEG C.
2. a kind of magnesium phosphate cement filling phase-change material according to claim 1, wherein, described magnesium phosphate cement is the homogeneous mixture that mol ratio is 4.5/1 being 1600 DEG C of grain magnesites with PHOSPHORIC ACID TECH.GRADE potassium dihydrogen.
3. a kind of magnesium phosphate cement filling phase-change material according to claim 1, wherein, described Gypsum Fibrosum is ardealite, specific surface area 250��350m2/kg��
4. a kind of magnesium phosphate cement filling phase-change material according to claim 1, wherein, described flyash is circulating fluid bed coal ash, specific surface area 700m2/ more than kg.
5. a kind of magnesium phosphate cement filling phase-change material according to claim 1, wherein:
1. a kind of phase transition temperature at the phase-change material of 20-25 DEG C by 89%CaCl2 6H2O+6%NaCl+5%Na2B4O7��10H2O forms;
2. a kind of phase transition temperature at the phase-change material of 30-35 DEG C by 62%Ca (NO3)2��4H2O+21%Mg (NO3)2��6H2O+17%Na2B4O7��10H2O forms;
3. a kind of phase transition temperature at the phase-change material of 35-45 DEG C by 20%Na2B4O7��10H2O+60%Na2HPO4��12H2O+20%CaCl 6H2O forms;
Above percentage ratio is mass percent.
6. the method preparing a kind of magnesium phosphate cement filling phase-change material as claimed in claim 1, it is characterised in that:
Flyash is mixed homogeneously by the proportion requirement of key component and phase transformation component with Gypsum Fibrosum, magnesium phosphate cement and phase-change material in blender.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106242469A (en) * | 2016-08-02 | 2016-12-21 | 中国科学院武汉岩土力学研究所 | A kind of preparation method of river and lake silt solidification and stabilization medicament |
| CN106278129A (en) * | 2016-08-23 | 2017-01-04 | 武汉理工大学 | A kind of 3D printing magnesium phosphate cement fast vigour wet stock and preparation method thereof |
| CN106396564A (en) * | 2016-08-26 | 2017-02-15 | 派丽(上海)管理有限公司 | Cement-based phase-change waterproof plugging material |
| CN107056225A (en) * | 2017-04-12 | 2017-08-18 | 武汉理工大学 | A kind of phosphate cement based patching material and preparation method thereof |
| CN110436884A (en) * | 2019-07-18 | 2019-11-12 | 深圳工建科技有限公司 | A kind of phase-changing energy storage material and preparation method thereof |
| CN111004011A (en) * | 2019-12-16 | 2020-04-14 | 中国科学院青海盐湖研究所 | Magnesium cement phase-change building material and preparation method thereof |
| CN111018379A (en) * | 2019-12-16 | 2020-04-17 | 中国科学院青海盐湖研究所 | Method for reducing hydration heat of magnesium cement |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106242469A (en) * | 2016-08-02 | 2016-12-21 | 中国科学院武汉岩土力学研究所 | A kind of preparation method of river and lake silt solidification and stabilization medicament |
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| CN106278129B (en) * | 2016-08-23 | 2018-11-30 | 武汉理工大学 | A kind of fast vigour wet stock of 3D printing magnesium phosphate cement and preparation method thereof |
| CN106396564A (en) * | 2016-08-26 | 2017-02-15 | 派丽(上海)管理有限公司 | Cement-based phase-change waterproof plugging material |
| CN107056225A (en) * | 2017-04-12 | 2017-08-18 | 武汉理工大学 | A kind of phosphate cement based patching material and preparation method thereof |
| CN110436884A (en) * | 2019-07-18 | 2019-11-12 | 深圳工建科技有限公司 | A kind of phase-changing energy storage material and preparation method thereof |
| CN111004011A (en) * | 2019-12-16 | 2020-04-14 | 中国科学院青海盐湖研究所 | Magnesium cement phase-change building material and preparation method thereof |
| CN111018379A (en) * | 2019-12-16 | 2020-04-17 | 中国科学院青海盐湖研究所 | Method for reducing hydration heat of magnesium cement |
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