CN108585566A - A kind of alkali magnesium sulfate air hardening cementitious materials and preparation method thereof - Google Patents
A kind of alkali magnesium sulfate air hardening cementitious materials and preparation method thereof Download PDFInfo
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- CN108585566A CN108585566A CN201810583978.3A CN201810583978A CN108585566A CN 108585566 A CN108585566 A CN 108585566A CN 201810583978 A CN201810583978 A CN 201810583978A CN 108585566 A CN108585566 A CN 108585566A
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- magnesium sulfate
- raw material
- cementitious materials
- air hardening
- alkali magnesium
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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
- C04B9/00—Magnesium cements or similar cements
- C04B9/04—Magnesium cements containing sulfates, nitrates, phosphates or fluorides
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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
- C04B9/00—Magnesium cements or similar cements
- C04B9/20—Manufacture, e.g. preparing the batches
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a kind of alkali magnesium sulfate air hardening cementitious materials and preparation method thereof, and the preparation method is as follows：1) dispensing：Calcareous raw material and magnesia raw material are uniformly mixed to obtained raw material, and the content of calcareous raw material is 2wt%~50wt% in raw material after broken, grinding；2) it calcines：Raw material are placed at 700~900 DEG C after calcining 30~150min, are cooled to room temperature, clinker is made；3) cementitious material is prepared：By clinker：Epsom salt：Additive is according to mass ratio 1：0.4~0.8：0.005~0.02 mixes, and alkali magnesium sulfate air hardening cementitious materials are obtained after grinding.The alkali magnesium sulfate air hardening cementitious materials that this method is prepared have the characteristics that convenient for storage, simple production process, easy to use, can be widely used for the production of the prefabricated components such as building block, wallboard and plastering material for inner wall.
Description
Technical field
The present invention relates to a kind of alkali magnesium sulfate air hardening cementitious materials and preparation method thereof, belong in building trade and are gelled
The preparation method field of material.
Background technology
Alkali magnesium sulfate cement is a kind of novel air-setting for growing up after magnesia oxychloride cement, magnesium oxysulfide concrete
Magnesium gelatinous material.It has the following advantages compared with magnesia oxychloride cement：1) insensitive to high temperature, resist especially suitable for requiring
The prefabricated components of high temperature；2) the steel protection property can be good；3) water repelling property is good；4) it is not easy damp suction surface halide accumulation.It is similar with magnesium oxysulfide concrete, belong to
MgO-MgSO4-H2O ternary gelling systems, but alkali magnesium sulfate cement be by additive technology obtain one kind it is high-strength, anti-
The more excellent magnesium gelatinous material of water, anti-salt property.
Currently, the production of magnesium cement product, often mixes and stirs the production technology of light burnt powder using brine.In order to preferably push away
Alkali magnesium sulfate cement is extensively used, simplifies the production process of magnesium cement product, it is proposed that the production of alkali magnesium sulfate cement powders
Method.However, being found through practice：The condensation of alkali magnesium sulfate cement hardens relatively slow (final setting time is in 3h or more) and with dampening
The extension of mud powder resting period, can lead to the further extension of cement setting time and early strength reduces.
Invention content
Technical problem：The purpose of the present invention is intended to overcome deficiency in the prior art, provides a kind of alkali magnesium sulfate air hardening
Property cementitious material and preparation method thereof；The present invention supplements suitable calcium source using dolomite, lime stone, is ensureing that raw material is complete
Under the premise of reaction, low temperature calcination obtains the mixture of active calcium oxide and magnesia, with additive, magnesium sulfate combined grinding
Afterwards, a kind of high-early-strength, alkali magnesium sulfate air hardening cementitious materials of good performance are obtained.
Technical solution：The present invention provides a kind of preparation method of alkali magnesium sulfate air hardening cementitious materials, this method packets
Include following steps：
1) dispensing：Calcareous raw material and magnesia raw material are uniformly mixed to obtained raw material, and calcareous original in raw material after broken, grinding
The content of material is 2wt%~50wt%；
2) it calcines：Raw material are placed at 700~900 DEG C after calcining 30~150min, are cooled to room temperature, clinker is made；
3) cementitious material is prepared：By clinker：Epsom salt：Additive is according to mass ratio 1：0.4~0.8：0.005~
0.02 mixes, and alkali magnesium sulfate air hardening cementitious materials are obtained after grinding.
Wherein：
Being uniformly mixed calcareous raw material and magnesia raw material in obtained raw material after broken, grinding described in step 1), is crushed, powder
Raw material after mill is crossed 80 mesh sieve nothing and is tailed over.
The calcareous raw material is one or more of Calcareous Dolomite, lime stone or magnesio dolomite.
The magnesia raw material is magnesite, includes following components according to mass percent：CaO1%~3%, MgO95%
~96%, SiO21.2%~5%, AI2O3+Fe2O30.01%~1.2%, and the sum of the mass percent of said components is
100%.
Alkali magnesium sulfate air hardening cementitious materials are obtained after grinding described in step 3), refer to grinding to 200 mesh without sieve
It is remaining to obtain alkali magnesium sulfate air hardening cementitious materials.
The additive is citric acid, cellulose ether and polycarboxylic acids pulvis water-reducing agent in mass ratio 1:0.5~2:2~4
The mixture being mixed to get.
The epsom salt is commercial product, wherein MgSO4·7H2Content >=98% of O.
The Calcareous Dolomite includes following components according to mass percent：CaO67%~70%, MgO 26%~
28%, SiO21%~3%, AI2O30.6%~1.2%, Fe2O30.8%~1%.
The magnesio dolomite includes following components according to mass percent：CaO16%~20%, MgO77%~
81%, SiO21%~2%, AI2O30.2%~0.6%, Fe2O30.8%~1.2%.
Include according to mass percent in the activating oxide of the clinker：Calcium oxide 2%~10%, magnesia 90%~
98%.
The present invention also provides a kind of alkali magnesium sulfate air hardening cementitious materials, the cementitious material is by above-mentioned alkali formula sulfuric acid
The preparation method of magnesium air hardening cementitious materials is prepared.
The final setting time for the alkali magnesium sulfate air hardening cementitious materials being prepared can be controlled at 10~30 minutes, 1
It compression strength is higher than 20MPa.
Advantageous effect：
(1) in alkali magnesium sulfate air hardening cementitious materials prepared by the present invention, active calcium oxide is introduced, water is met and is formed
Calcium hydroxide improves the hydroxyl concentration in system, promotes 517 phase of hydrated product (5Mg (OH)2·MgSO4·7H2O shape)
At, shorten induction period, the condensation of cementitious material is accelerated harden, solves cement powders storage, the problem that setting time is grown；Together
When, the easy moisture absorption aquation of active calcium oxide is calcium hydroxide, acts as the drier of cement powders, it is therefore prevented that activated magnesia is being deposited
Active loss during putting improves the stability of cement storage.
(2) it uses after the alkali magnesium sulfate air hardening cementitious materials aquation for preparing of the present invention as alkalinity, compares magnesium oxysulfide water
Mud more anti-corrosion；Calcium hydroxide is increased in hydrated product, is easily carbonized, and the compactness of material can be increased by being carbonized, and enhance surface
Water resistance.
(3) using the alkali magnesium sulfate air hardening cementitious materials that prepare of the present invention because aquation contain calcium ion and hydroxyl from
Son, it is good with water reducer compatibility, water-reducing rate is improved, intensity improves 50% compared to magnesium oxysulfide concrete, especially suitable for prefabrication
Component reduces drying time while improving prefabrication component strength.
(4) preparation process of the present invention is simple, easy to operate, makes full use of the calcination temperature of light calcined magnesia, scientific and reasonable
Ground introduces calcium source, has saved the energy；And dolomite mineral, limestone mine are widely distributed in China, and price is cheap, compensates for magnesite
Mine is distributed wideless, the disadvantage of reserves Relatively centralized, and it is not only cost-effective but also be white clouds to introduce calcium source using dolomite, lime stone as raw material
The comprehensive utilization of stone provides new approaches, highly practical.
(5) using the alkali magnesium sulfate air hardening cementitious materials that prepare of the present invention, convenient for storage, setting time it is short (10~
30min), hardening is fast, early strength is high, and 1d intensity is higher than 20MPa, shortens the production cycle of product, improves production efficiency.
Specific implementation mode
In order to better understand the present invention, the invention will be further described below, but it is only suitable to should not be understood as the present invention
For following Examples, person skilled in art changes according to some that the content of aforementioned present invention makes the present invention are nonessential
Into and adjustment, still fall within protection scope of the present invention.
The present invention provides a kind of alkali magnesium sulfate air hardening cementitious materials and preparation method thereof, utilize dolomite, lime
Stone supplements suitable calcium source, and under the premise of ensureing that raw material reacts completely, low temperature calcination obtains active calcium oxide and magnesia
Mixture obtain a kind of high-early-strength, alkali magnesium sulfate air hardening of good performance after additive, magnesium sulfate combined grinding
Property cementitious material, the alkali magnesium sulfate air hardening cementitious materials can be widely used for the production of building product.
Calcareous Dolomite, lime stone, magnesio dolomite, magnesite, citric acid, the polycarboxylic acids powder used in following embodiment
Agent water-reducing agent, cellulose ether are commercial product.
Calcareous Dolomite used includes following components according to mass percent：CaO67%~70%, MgO 26%~
28%, SiO21%~3%, AI2O30.6%~1.2%, Fe2O30.8%~1%；
Magnesio dolomite used includes following components according to mass percent：CaO16%~20%, MgO77%~
81%, SiO21%~2%, AI2O30.2%~0.6%, Fe2O30.8%~1.2%；
Magnesia raw material used is magnesite, includes following components according to mass percent：CaO 1%~3%, MgO
95%~96%, SiO21.2%~5%, AI2O3+Fe2O30.01%~1.2%；
Epsom salt used is commercial product, wherein MgSO4·7H2Content >=98% of O.
Embodiment 1：
A kind of preparation method of alkali magnesium sulfate air hardening cementitious materials, includes the following steps：
A, dispensing：After lime stone and magnesite levigate (crossing 80 mesh sieve nothing to tail over), it is uniformly mixed and raw material is made, in raw material
The content of lime stone is 12wt%；
B, it calcines：Raw material are placed at 830 DEG C after calcining 60min, are cooled to room temperature, clinker is made；
C, cementitious material is prepared：Clinker and epsom salt, additive are pressed 1：0.6：0.02 mass ratio feeding is mixed
It is milled to 200 mesh after conjunction without tailing over, obtains alkali magnesium sulfate air hardening cementitious materials.
The additive is citric acid, cellulose ether and polycarboxylic acids pulvis water-reducing agent in mass ratio 1:1:3 mixture.
A kind of alkali magnesium sulfate air hardening cementitious materials, the cementitious material are prepared by the above method.
Embodiment 2：
A kind of preparation method of alkali magnesium sulfate air hardening cementitious materials, includes the following steps：
A, dispensing：Calcareous Dolomite and magnesite levigate (crossing 80 mesh sieve nothing to tail over) are uniformly mixed obtained raw material afterwards, it is raw
The content of Calcareous Dolomite is 15wt% in material；
B, it calcines：Mixture is placed at 900 DEG C after calcining 60min, is cooled to room temperature, clinker is made；
C, cementitious material is prepared：Clinker and epsom salt, additive are pressed 1：0.5：0.01 mass ratio feeding is mixed
It is milled to 200 mesh after conjunction without tailing over, obtains alkali magnesium sulfate air hardening cementitious materials.
The additive is citric acid, cellulose ether and polycarboxylic acids pulvis water-reducing agent in mass ratio 1:0.5:2 mixing
Object.
A kind of alkali magnesium sulfate air hardening cementitious materials, the cementitious material are prepared by the above method.
Embodiment 3：
A kind of preparation method of alkali magnesium sulfate air hardening cementitious materials, includes the following steps：
A, dispensing：Magnesio dolomite and magnesite levigate (crossing 80 mesh sieve nothing to tail over) are uniformly mixed obtained raw material afterwards, it is raw
The content of magnesio dolomite is 33wt% in material；
B, it calcines：Mixture is placed at 870 DEG C after calcining 150min, is cooled to room temperature, clinker is made；
C, cementitious material is prepared：Clinker and epsom salt, additive are pressed 1：0.5：0.02 mass ratio feeding is mixed
It is milled to 200 mesh after conjunction without tailing over, obtains alkali magnesium sulfate air hardening cementitious materials.
The additive is citric acid, cellulose ether and polycarboxylic acids pulvis water-reducing agent in mass ratio 1:1:2 mixture.
A kind of alkali magnesium sulfate air hardening cementitious materials, the cementitious material are prepared by the above method.
Embodiment 4：
A kind of preparation method of alkali magnesium sulfate air hardening cementitious materials, includes the following steps：
A, dispensing：Calcareous Dolomite, magnesio dolomite and magnesite levigate rear (crossing 80 mesh sieve nothing to tail over) are uniformly mixed
Raw material are made, the content of Calcareous Dolomite is 10wt% in raw material, and the content of magnesio dolomite is 40wt%；
B, it calcines：Mixture is placed at 900 DEG C after calcining 120min, is cooled to room temperature, clinker is made；
C, cementitious material is prepared：Clinker and epsom salt, additive are pressed 1：0.8：0.005 mass ratio feeding,
It is milled to 200 mesh after mixing without tailing over, obtains alkali magnesium sulfate air hardening cementitious materials.
The additive is citric acid, cellulose ether and polycarboxylic acids pulvis water-reducing agent in mass ratio 1:2:2 mixture.
A kind of alkali magnesium sulfate air hardening cementitious materials, the cementitious material are prepared by the above method.
Embodiment 5：
A kind of preparation method of alkali magnesium sulfate air hardening cementitious materials, includes the following steps：
A, dispensing：Lime stone 8wt%, magnesio dolomite and magnesite levigate (crossing 80 mesh sieve nothing to tail over) are uniformly mixed afterwards
Raw material are made, the content of lime stone is 8wt% in raw material, and the content of magnesio dolomite is 35wt%；
B, it calcines：Mixture is placed at 825 DEG C after calcining 60min, is cooled to room temperature, clinker is made；
C, cementitious material is prepared：Clinker and epsom salt, additive are pressed 1：0.5：0.03 mass ratio feeding is mixed
It is milled to 200 mesh after conjunction without tailing over, obtains alkali magnesium sulfate air hardening cementitious materials.
The additive is citric acid, cellulose ether and polycarboxylic acids pulvis water-reducing agent in mass ratio 1:1:2 mixture.
A kind of alkali magnesium sulfate air hardening cementitious materials, the cementitious material are prepared by the above method.
Through measure checkout, when water consumption under cementitious material fluidity 150mm ± 5mm prepared by Examples 1 to 5, condensation
Between and compression strength be shown in Table 1：
Table 1
Claims (10)
1. a kind of preparation method of alkali magnesium sulfate air hardening cementitious materials, it is characterised in that：This approach includes the following steps：
1) dispensing：Calcareous raw material and magnesia raw material are uniformly mixed to obtained raw material, and calcareous raw material in raw material after broken, grinding
Content is 2wt%~50wt%；
2) it calcines：Raw material are placed at 700~900 DEG C after calcining 30~150min, are cooled to room temperature, clinker is made；
3) cementitious material is prepared：By clinker：Epsom salt：Additive is according to mass ratio 1：0.4~0.8：0.005~0.02 is mixed
It closes, alkali magnesium sulfate air hardening cementitious materials is obtained after grinding.
2. a kind of preparation method of alkali magnesium sulfate air hardening cementitious materials as described in claim 1, it is characterised in that：Step
1) being uniformly mixed calcareous raw material and magnesia raw material in obtained raw material after broken, grinding described in, is crushed, the raw material mistake after grinding
80 mesh sieve nothing tails over.
3. a kind of preparation method of alkali magnesium sulfate air hardening cementitious materials as described in claim 1, it is characterised in that：It is described
Calcareous raw material be one or more of Calcareous Dolomite, lime stone or magnesio dolomite.
4. by the preparation method of alkali magnesium sulfate air hardening cementitious materials described in claim 1, it is characterised in that：Described is magnesia
Raw material is magnesite, includes following components according to mass percent：CaO1%~3%, MgO95%~96%, SiO21.2%~
5%, AI2O3+Fe2O30.01%~1.2%, and the sum of mass percent of said components is 100%.
5. a kind of preparation method of alkali magnesium sulfate air hardening cementitious materials as described in claim 1, it is characterised in that：Step
3) alkali magnesium sulfate air hardening cementitious materials are obtained after the grinding described in, refer to grinding to 200 mesh without tailing over, obtain alkali formula sulphur
Sour magnesium air hardening cementitious materials.
6. a kind of preparation method of alkali magnesium sulfate air hardening cementitious materials as described in claim 1, it is characterised in that：It is described
Additive be citric acid, cellulose ether and polycarboxylic acids pulvis water-reducing agent in mass ratio 1:0.5~2:2~4 be mixed to get it is mixed
Close object.
7. a kind of preparation method of alkali magnesium sulfate air hardening cementitious materials as described in claim 1, it is characterised in that：It is described
Epsom salt be commercial product, wherein MgSO4·7H2Content >=98% of O.
8. a kind of preparation method of alkali magnesium sulfate air hardening cementitious materials as described in claim 3, it is characterised in that：It is described
Calcareous Dolomite according to mass percent include following components：CaO67%~70%, MgO 26%~28%, SiO21%
~3%, AI2O30.6%~1.2%, Fe2O30.8%~1%.
9. a kind of preparation method of alkali magnesium sulfate air hardening cementitious materials as described in claim 3, it is characterised in that：It is described
Magnesio dolomite according to mass percent include following components：CaO16%~20%, MgO77%~81%, SiO21%~
2%, AI2O30.2%~0.6%, Fe2O30.8%~1.2%.
10. a kind of alkali magnesium sulfate air hardening cementitious materials, it is characterised in that：The cementitious material is by any institute of claim 1~9
The preparation method for the alkali magnesium sulfate air hardening cementitious materials stated is prepared.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113896442A (en) * | 2021-11-19 | 2022-01-07 | 武汉理工大学 | Magnesium-based cementing material and preparation method and application thereof |
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| CN104891832A (en) * | 2015-05-22 | 2015-09-09 | 周末 | Antifatigue basic magnesium sulfate cement and preparation method thereof |
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| CN102924038A (en) * | 2012-12-04 | 2013-02-13 | 中国科学院青海盐湖研究所 | Modified magnesium oxy-sulfur cement |
| CN104891832A (en) * | 2015-05-22 | 2015-09-09 | 周末 | Antifatigue basic magnesium sulfate cement and preparation method thereof |
Non-Patent Citations (2)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113896442A (en) * | 2021-11-19 | 2022-01-07 | 武汉理工大学 | Magnesium-based cementing material and preparation method and application thereof |
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