CN112645617A - Containing C7A5Magnesium aluminate cement material of M mineral - Google Patents

Containing C7A5Magnesium aluminate cement material of M mineral Download PDF

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Publication number
CN112645617A
CN112645617A CN202110054599.7A CN202110054599A CN112645617A CN 112645617 A CN112645617 A CN 112645617A CN 202110054599 A CN202110054599 A CN 202110054599A CN 112645617 A CN112645617 A CN 112645617A
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mineral
magnesium
cement
aluminate
cement material
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CN202110054599.7A
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CN112645617B (en
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姜奉华
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University of Jinan
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University of Jinan
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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
    • C04B7/00—Hydraulic cements
    • C04B7/32—Aluminous cements
    • 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
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
    • C04B7/44—Burning; Melting

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention provides a catalyst containing C7A5The magnesium aluminate cement material with M mineral comprises 40-60% by weight of magnesium heptacalcium pentaaluminate mineral in cement clinker, and the magnesium heptacalcium pentaaluminate is 7CaO.5Al2O3MgO. The cement clinker also contains monocalcium aluminate and magnesium aluminate. Of the invention containing C7A5The aluminate cement material of M mineral has outstanding early strength and quick hardening performance, low sintering temperature, good hydration performance and energy conservation. Compressive strength of cement mortar: the 3d is 30-50 MPa, the 28d is 60-80 MPa, the middle and later stage strength of the cement is remarkably improved, and the strength loss caused by dry shrinkage is compensated.

Description

Containing C7A5Magnesium aluminate cement material of M mineral
Technical Field
The invention belongs to the technical field of cement materials, and relates to a cement material containing C7A5Magnesium aluminate cement material of M mineral.
Background
The main mineral composition of high alumina cement is monocalcium aluminate (cao. al)2O3CA) and calcium dialuminate (CaO.2Al)2O3Abbreviation CA2) And a small amount of dicalcium aluminosilicate (2 CaO. Al)2O3.SiO2Abbreviation C2AS, also known AS gehlenite), CA and CA in this system2Has good hydration activity, and the hydration product is CaO2O3.10H2O (CAH for short)10）、2CaO.Al2O3.8H2O (abbreviation C)2AH8）、3CaO.Al2O3.6H2O (abbreviation C)3AH6) And aluminium glue Al (OH)3(abbreviation AH3) Because the crystal structures are flaky and acicular and are mutually staggered and overlapped to form a firm framework, the middle part is filled with the aluminum cement,the early strength of the high alumina cement is large because a dense structure is formed. But CAH10And C2AH8Are all meta-stable, with the middle and late stages gradually stabilizing C3AH6The transformation is also the reason for the later strength retraction of the high-alumina cement, and limits the application of the cement in engineering.
C7A5M is CaO-MgO-Al2O3A thermodynamically stable mineral in the system, denoted by C7A5Mineral C of magnesium aluminate cement system with M as main component7A5M, CA (or C)12A7) And MA, the hydration product of which, when the cement is hydrated, has CAH10、C2AH8、C3AH6And alumina gel, and MA (magnesium aluminate, MgO. Al)2O3MA) formed by hydration, the brucite has micro-expansion performance in the middle and later period and can compensate the CAH of diaspore10And C2AH8To C3AH6The strength loss caused by the dry shrinkage of the transformed cement sample is changed, and the middle and later stage strength of the cement is obviously improved.
Disclosure of Invention
In order to overcome the defect of the middle and later strength shrinkage of aluminate cement, a C-containing cement is provided7A5The novel magnesium aluminate cement material of M mineral has the advantages of low sintering temperature, high early strength and no reverse shrinkage of middle and later strength.
The invention is realized by the following technical scheme:
containing C7A5The magnesium aluminate cement material with M mineral comprises 40-60% by weight of magnesium heptacalcium pentaaluminate mineral in cement clinker, and the magnesium heptacalcium pentaaluminate is 7CaO.5Al2O3.MgO。
Furthermore, the cement clinker also contains monocalcium aluminate and magnesium aluminate.
Containing C7A5The magnesium aluminate cement material of M mineral comprises the following mineral components in percentage by weight: 45-60% of magnesium heptacalcium pentaaluminate, 35-50% of monocalcium aluminate and 5% of magnesium aluminate. Chemical composition of raw materialThe percentage is as follows: 30-50% of calcium oxide, 45-60% of aluminum oxide and 1-5% of magnesium oxide.
Further, said C is7A5The calcining temperature of the magnesium aluminate cement material of the M mineral is 1300 ℃, and the heat preservation time is 20-60 min. The invention contains C7A5The aluminate cement material of M mineral has the advantages that the sintering temperature is generally 1300 ℃, the sintering temperature is reduced by 150 ℃ compared with the sintering temperature of 1450 ℃ of common portland cement, the sintering temperature is reduced by 50-150 ℃ compared with high-alumina cement, the energy is saved, and the cost of the cement is reduced.
Advantageous effects
Of the invention containing C7A5The aluminate cement material of M mineral has outstanding early strength and quick hardening performance, low firing temperature, good hydration performance and energy conservation; the raw materials can utilize limestone and bauxite containing magnesium, and natural resources are fully utilized; because the consumption of the limestone raw material is lower than that of the portland cement, the emission of greenhouse gases is reduced during production, and the environment-friendly effect is achieved.
Of the invention containing C7A5The compression strength of the cement mortar of the aluminate cement material of M mineral is as follows: the 1d is 30.2-35.8 MPa, the 3d is 42.5-45.4 MPa, and the 28d is 62.8-69.3 MPa, so that the middle and later stage strength of the cement is remarkably improved, and the strength loss caused by dry shrinkage is compensated.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Example 1
With C7A5Taking an M-CA-MA cement system as an example, the raw material proportion is as follows: calcium oxide (CaO): 37.37%, alumina (Al 2O 3): 58.67%, magnesium oxide (MgO): 3.96 percent. The clinker comprises the following components: c7A5M：60%，CA：35%，MA： 5%。
The silicon carbide rod is sintered in an electric furnace in a laboratory, the normal temperature rise rate (10 ℃/min) is realized, the sintering temperature is controlled at 1300 ℃, and the heat preservation time is 30 min.
Crushing the clinker in a laboratory by using a small-sized sampling machine, and controlling the granularity to be 5 percent after sieving through a 200-mesh square-hole sieve; the test conditions of the compressive strength are as follows: the mold is molded by adopting 2 multiplied by 2cm3, the water cement ratio is 0.4, the sand cement ratio is 1, and the compression strength of each age is measured as follows: 30.2MPa for 1d, 42.5MPa for 3d and 62.8MPa for 28 d.
Example 2
Containing C7A5The magnesium aluminate cement material of M mineral comprises the following raw materials in percentage by chemical composition: 37.06% of calcium oxide, 59.19% of aluminum oxide and 3.71% of magnesium oxide. The clinker comprises the following mineral components in percentage by weight: 55 percent of magnesium heptacalcium pentaaluminate, 40 percent of monocalcium aluminate and 5 percent of magnesium aluminate.
The compressive strength of the cement at each age is as follows: 32.4MPa for 1d, 43.2MPa for 3d and 63.7MPa for 28 d.
Example 3
Containing C7A5The magnesium aluminate cement material of M mineral comprises the following raw materials in percentage by chemical composition: 36.76% of calcium oxide, 59.71% of aluminum oxide and 3.53% of magnesium oxide. The clinker comprises the following mineral components in percentage by weight: 50% of magnesium heptacalcium pentaaluminate, 45% of monocalcium aluminate and 5% of magnesium aluminate.
The compressive strength of the cement at each age is as follows: 34.5MPa for 1d, 44.2MPa for 3d and 66.5MPa for 28 d.
Example 4
Containing C7A5The magnesium aluminate cement material of M mineral comprises the following raw materials in percentage by chemical composition: 36.45% of calcium oxide, 60.23% of aluminum oxide and 3.32% of magnesium oxide. The clinker comprises the following mineral components in percentage by weight: 45% of magnesium heptacalcium pentaaluminate, 50% of monocalcium aluminate and 5% of magnesium aluminate.
The compressive strength of the cement at each age is as follows: 35.8MPa for 1d, 45.7MPa for 3d and 69.3MPa for 28 d.
Comparative example 1
The high-alumina cement has the raw material comprising the following chemical components in percentage by weight: 37.92 percent of calcium oxide and 62.08 percent of aluminum oxide. The clinker comprises the following mineral components in percentage by weight: 35% of dodecacalcium heptaluminate, 50% of monocalcium aluminate and 15% of dicalcium aluminate.
The compressive strength of the cement mortar is as follows: 34.1MPa for 1d, 45.4MPa for 3d and 40.7MPa for 28 d.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (5)

1. Containing C7A5The magnesium aluminate cement material with M mineral is characterized in that the weight percentage of magnesium heptacalcium pentaaluminate mineral in cement clinker is 40-60%, and the magnesium heptacalcium pentaaluminate is 7CaO.5Al2O3.MgO。
2. A composition according to claim 1, which contains C7A5The magnesium aluminate cement material of M mineral is characterized in that the cement clinker also contains monocalcium aluminate and magnesium aluminate.
3. A composition according to claim 1, which contains C7A5The magnesium aluminate cement material of M mineral is characterized in that the cement clinker comprises the following mineral components in percentage: 45-60% of magnesium heptacalcium pentaaluminate, 35-50% of monocalcium aluminate and 5% of magnesium aluminate.
4. A composition according to claim 1, which contains C7A5The magnesium aluminate cement material of M mineral is characterized in that the chemical composition percentage of the cement raw meal is as follows: 30-50% of calcium oxide, 45-60% of aluminum oxide and 1-5% of magnesium oxide.
5. A composition according to claim 1, which contains C7A5Magnesium aluminate cement material of M mineral, characterized in that C is7A5The calcining temperature of the magnesium aluminate cement material of the M mineral is 1300 ℃, and the heat preservation time is 20-60 min.
CN202110054599.7A 2021-01-15 2021-01-15 Containing C7A5Magnesium aluminate cement material of M mineral Active CN112645617B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113860775A (en) * 2021-10-13 2021-12-31 福州大学 Magnesium phosphate cement containing C7A5M mineral and preparation method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1600727A (en) * 2004-10-22 2005-03-30 济南大学 Aluminate cement material of containing mineral in Q phase
CN103232179A (en) * 2012-04-28 2013-08-07 中国建筑材料科学研究总院 High-magnesium calcium sulphoaluminate-modified portland cement clinker and production method thereof
WO2013140234A1 (en) * 2012-03-21 2013-09-26 Greenmade Development Ltd Method for preparing hydraulic binders comprising a mixture of sulphoaluminate clinker or cement and calcium sulphate
JP5924435B1 (en) * 2015-03-18 2016-05-25 住友大阪セメント株式会社 Clinker composition and cement composition
CN109369044A (en) * 2018-11-28 2019-02-22 中国建筑材料科学研究总院有限公司 A kind of sulphate aluminium cement and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1600727A (en) * 2004-10-22 2005-03-30 济南大学 Aluminate cement material of containing mineral in Q phase
WO2013140234A1 (en) * 2012-03-21 2013-09-26 Greenmade Development Ltd Method for preparing hydraulic binders comprising a mixture of sulphoaluminate clinker or cement and calcium sulphate
CN103232179A (en) * 2012-04-28 2013-08-07 中国建筑材料科学研究总院 High-magnesium calcium sulphoaluminate-modified portland cement clinker and production method thereof
JP5924435B1 (en) * 2015-03-18 2016-05-25 住友大阪セメント株式会社 Clinker composition and cement composition
CN109369044A (en) * 2018-11-28 2019-02-22 中国建筑材料科学研究总院有限公司 A kind of sulphate aluminium cement and preparation method thereof

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113860775A (en) * 2021-10-13 2021-12-31 福州大学 Magnesium phosphate cement containing C7A5M mineral and preparation method thereof

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