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Magnesium aluminate cement material containing C7A5M mineral

A technology of magnesium aluminate and cement materials, which is applied in the field of cement materials, can solve the problems of restricting the application of cement, and achieve the effects of highlighting early strength and rapid hardening performance, reducing emissions, and saving energy

Active Publication Date: 2021-04-13
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But CAH 10 and C 2 AH 8 All are metastable, and gradually become stable in the middle and later stages C 3 AH 6 This is also the reason for the later strength shrinkage of high alumina cement, which limits the application of this cement in engineering

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] with C 7 A 5 For the M-CA-MA cement system, the raw material ratio is: calcium oxide (CaO): 37.37%, alumina (Al2O3): 58.67%, magnesium oxide (MgO): 3.96%. The clinker composition is: C 7 A 5 M: 60%, CA: 35%, MA: 5%.

[0016] In the laboratory, a silicon carbide rod electric furnace is used for firing, the normal heating rate (10°C / min), the firing temperature is controlled at 1300°C, and the holding time is 30min.

[0017] In the laboratory, a small prototype machine is used to crush the clinker, and the particle size is controlled to pass through a 200-mesh square hole sieve, and the remaining 5% is sieved; the compressive strength test conditions: the mold is formed by 2×2×2cm3, the water-cement ratio is 0.4, and the sand The gray ratio is 1, and the measured compressive strength of each age is: 1d is 30.2Mpa, 3d is 42.5Mpa, and 28d is 62.8MPa.

Embodiment 2

[0019] a C 7 A 5 M mineral magnesium aluminate cement material, the chemical composition percentage of raw meal is: calcium oxide 37.06%, aluminum oxide 59.19%, magnesium oxide 3.71%. The percentage of mineral components of the clinker is: heptacalcium magnesium pentaaluminate 55%, monocalcium aluminate 40%, magnesium aluminate 5%.

[0020] The compressive strength of the cement at each age is: 32.4Mpa for 1d, 43.2Mpa for 3d, and 63.7MPa for 28d.

Embodiment 3

[0022] a C 7 A 5 M mineral magnesium aluminate cement material, the chemical composition percentage of raw meal is: calcium oxide 36.76%, aluminum oxide 59.71%, magnesium oxide 3.53%. The percentage content of the mineral components of the clinker is: heptacalcium magnesium pentaaluminate 50%, monocalcium aluminate 45%, magnesium aluminate 5%.

[0023] The compressive strength of the cement at each age is: 34.5Mpa for 1d, 44.2Mpa for 3d, and 66.5MPa for 28d.

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Abstract

The invention provides a magnesium aluminate cement material containing a C7A5M mineral, the weight percentage of a magnesium pentacalcium aluminate mineral in cement clinker is 40-60%, and the magnesium pentacalcium aluminate is 7CaO. 5Al2O3. MgO. And the cement clinker also contains monocalcium aluminate and magnesium aluminate. The aluminate cement material containing the C7A5M mineral has outstanding early strength and rapid hardening performance, and is low in firing temperature, good in hydration performance and energy-saving. The compressive strength of the cement mortar is 30-50 MPa in 3d and 60-80 MPa in 28d, the middle and later strength of the cement is remarkably improved, and the strength loss caused by air shrinkage is made up.

Description

technical field [0001] The invention belongs to the technical field of cement materials, and relates to a C-containing 7 A 5 M mineral magnesium aluminate cement material. Background technique [0002] The main mineral composition of high alumina cement is monocalcium aluminate (CaO.Al 2 o 3 CA for short), calcium dialuminate (CaO.2Al 2 o 3 CA for short 2 ), and a small amount of dicalcium aluminosilicate (2CaO.Al 2 o 3 .SiO 2 C for short 2 AS, also known as calcium aluminate feldspar), in this system CA and CA 2 The hydration activity is good, and the hydration product is CaO.Al 2 o 3 .10H 2 O (referred to as CAH 10 ), 2CaO.Al 2 o 3 .8H 2 O (referred to as C 2 AH 8 ), 3CaO.Al 2 o 3 .6H 2 O (referred to as C 3 AH 6 ) and aluminum glue Al(OH) 3 (referred to as AH 3 ), because the crystal structure is flaky and needle-like, interlaced and overlapped to form a solid skeleton, and aluminum glue fills the middle to form a dense structure, so the early st...

Claims

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Application Information

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IPC IPC(8): C04B7/32C04B7/44
CPCC04B7/32C04B7/44
Inventor 姜奉华
Owner UNIV OF JINAN
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