Carbonation-resistant basic magnesium sulfate cement and preparation method thereof

A magnesium sulfate, anti-carbonization technology, applied in the field of cementitious materials, to achieve high folding ratio, improve toughness, and increase strength

Inactive Publication Date: 2015-09-23
周末
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is a lack of an anti-carbonation basic magnesium sulfate cement with excellent performance and a preparation method thereof

Method used

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  • Carbonation-resistant basic magnesium sulfate cement and preparation method thereof
  • Carbonation-resistant basic magnesium sulfate cement and preparation method thereof
  • Carbonation-resistant basic magnesium sulfate cement and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] like figure 1 and figure 2 as shown, figure 1 It is the SEM topography of the microstructure of traditional magnesium oxysulfide cement after 30 days of hydration; figure 2 It is the SEM image of the anti-carbonation basic magnesium sulfate cement 30d of the present invention; the hydration product of the anti-carbonization basic magnesium sulfate cement prepared from industrial raw materials is 5.1.7 whiskers.

[0031] It can be seen that the hydration structure of traditional magnesium oxysulfide cement is mainly composed of a large number of flaky Mg(OH)2 crystals, and the structure is loose and the pores are more. The microstructure of anti-carbonation basic magnesium sulfate cement after hydration is composed of a large number of needle-like 5·1·7 whiskers with relatively uniform spatial distribution. The structure is dense, and there are both Mg(OH)2 gel phase and needle The rod-shaped 5.1.7 whisker crystals are interwoven into a continuous three-dimensional ...

Embodiment 2

[0052] The difference between embodiment 2 and embodiment 1 is: a kind of anti-carbonization basic magnesium sulfate cement of the present invention, described anti-carbonization basic magnesium sulfate cement is made up of the component of following mass percentage:

[0053]

[0054]

[0055] The magnesium oxide refers to any one or a combination of the magnesium oxide powder material produced by calcined magnesite and the by-product magnesium oxide powder material produced in the process of extracting lithium carbonate from salt lake brine.

[0056] Described magnesium oxide is made up of the component of following mass percentage:

[0057]

[0058] The method for preparing the described anti-carbonation basic magnesium sulfate cement of the present invention comprises the following steps: in step (1), each component of the above-mentioned ratio is taken by proportioning, magnesium oxide 45%, magnesium sulfate heptahydrate 23 %, industrial waste powder 15%, white sl...

Embodiment 3

[0061] The difference between embodiment 3 and embodiment 1 is: a kind of anti-carbonization basic magnesium sulfate cement of the present invention, the described anti-carbonization basic magnesium sulfate cement is made up of the component of following mass percentage:

[0062]

[0063] The method for preparing the described anti-carbonation basic magnesium sulfate cement of the present invention comprises the following steps: in step (1), each component of the above-mentioned ratio is weighed by proportioning, magnesium oxide 55%, magnesium sulfate heptahydrate 25% %, industrial waste powder 20%, white slag 9%, mineral admixture 8%, desulfurization gypsum 4%, slag 8%, straw 4%, silica fume 3%, coagulant 3%;

[0064] In step (3), the magnesium oxide is calcined and ground at a temperature of 980° C. to obtain a powder with a fineness of 300 mesh. The stirring speed is 2000r / min.

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Abstract

The invention discloses carbonation-resistant basic magnesium sulfate cement. The carbonation-resistant basic magnesium sulfate cement is prepared from the following components in percentage by mass: 40 to 55% of magnesium oxide, 20 to 25% of magnesium sulfate heptahydrate, 10 to 20% of industrial waste residue powder, 5 to 9% of white slag, 3 to 8% of mineral admixtures, 2 to 4% of desulfurization gypsum, 6 to 8% of mineral slag, 2 to 4% of straws, 1 to 3% of silica fume and 1 to 3% of adjustable solidification agent. Proper additives are added in magnesium oxysulfate cement to form a novel basic magnesium oxysulfate phase; the carbonation-resistant basic magnesium sulfate cement with totally different property and performance from traditional magnesium oxysulfate cement is produced; the main hydration product of the basic magnesium sulfate cement is 517 crystal whisker; the carbonation-resistant basic magnesium sulfate cement is novel special cement with features of self-formed crystal whisker, high intensity, high toughness, high ratio of compressive strength, carbonation resistance, brine resistance, hydrothermal resistance, seawater corrosion resistance, shock resistance, antifatigue, corrosion of steel bar resistance, high durability and long service life.

Description

【Technical field】 [0001] The invention relates to the field of cementitious materials, in particular to an anti-carbonation basic magnesium sulfate cement and a preparation method thereof. 【Background technique】 [0002] Both magnesium oxysulfide cement and magnesium oxychloride cement can be called magnesium cement, which has the characteristics of light weight, fire prevention, fast setting, sound insulation, and heat insulation. Compared with magnesium oxychloride cement, magnesium oxysulfide cement has the main advantages of good temperature resistance and poor corrosion resistance to steel bars. A fatal disadvantage of magnesium oxysulfide cement is that its strength is lower than that of magnesium oxychloride cement, even lower than that of Portland cement, which is also the main reason for limiting the large-scale application of magnesium oxysulfide cement. [0003] Magnesium oxysulfide cement is an inorganic gelling material prepared by mixing magnesium sulfate solu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B9/04
Inventor 周末
Owner 周末
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