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Method for reducing hydration heat release of magnesium cement material

A magnesia cementitious material and heat release technology, applied in the field of building materials, can solve the problems of large heat release and restrictions on large-scale application

Inactive Publication Date: 2015-03-25
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation process of magnesia cementitious materials, it usually has the disadvantage of large heat release, which limits its further large-scale application

Method used

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  • Method for reducing hydration heat release of magnesium cement material

Examples

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Effect test

Embodiment 1

[0022] The raw material magnesia comes from the calcined product of magnesium slag, a by-product of lithium extraction from salt lakes, and the dosage is 129 parts. This example contains about 70% of the raw material magnesia for cement preparation, that is, about 90 parts of magnesia.

[0023] Dissolve 168 parts of bischofite (i.e. magnesium chloride hexahydrate) in 179 parts of tap water to form an aqueous solution of magnesium chloride, where the tap water is the added water, that is, the additional water added to the system, and the following refers to This meaning; then dissolve 129 parts of the above-mentioned calcined product and 10 parts of slag in the magnesium chloride aqueous solution, and stir evenly to form a magnesia gelling material, and the above-mentioned parts are parts by mass; that is to say, in the magnesia gelling material Among them, the mass ratio of ore mixed with magnesium oxide, magnesium chloride and water is 1.2:1:3.2, where water refers to the tota...

Embodiment 2

[0027] The raw material magnesium oxide is derived from dolomite lightly burned powder (the content of magnesium oxide is about 20% to 28%), that is, the calcined product of dolomite, and the consumption is about 388 parts. Among them, the content of magnesium oxide in this embodiment is 23% to 28%. 26%, that is to keep the consumption of raw material magnesia about 95 parts.

[0028] Dissolve about 101 parts of magnesium chloride hexahydrate in about 80 parts of tap water to form an aqueous magnesium chloride solution; then add about 388 parts of the above-mentioned dolomite lightly burned powder containing 23% to 26% of magnesium oxide and 5 parts of silica fume, and mix After being uniform, a magnesia gelling material is formed, and the above-mentioned parts are parts by mass; that is to say, in the magnesia gelling material, the mass ratio of magnesium oxide, magnesium chloride and water is 2.1:1:2.8, where water The source is the same as described in Example 1; and the ra...

Embodiment 3

[0031] The raw material magnesium oxide is derived from lightly burned magnesite powder, i.e. the calcined product of magnesite, with an amount of 115 parts, wherein the magnesium oxide content is 60% to 62%, that is to say, in the lightly burned magnesite powder of this embodiment The magnesium oxide content is about 70 parts.

[0032] Dissolve about 72 parts of magnesium chloride hexahydrate in about 32 parts of water to form a magnesium chloride aqueous solution, then dissolve 115 parts of the above-mentioned lightly burned magnesite powder and 30 parts of fly ash in the magnesium chloride aqueous solution, and stir evenly to form a magnesium gel material, the above-mentioned parts are all parts by mass; that is to say, in the magnesia gelling material, the mass ratio of ore-doped magnesium oxide, magnesium chloride and water is 2.8:1:2, and the source of water here is the same as in the embodiment 1; and the ratio of the amount of fly ash added to the mineral admixture to ...

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Abstract

The invention discloses a method for reducing hydration heat release of a magnesium cement material. The method comprises the following steps: mixing ore-doped magnesium oxide, magnesium chloride and water at the mass ratio of (1.2-2.8) to 1 to (2-3.2) evenly, so as to form the magnesium cement material, wherein the ore-doped magnesium oxide comprises magnesium oxide and a mineral admixture; and the mass ratio of the mineral admixture to the ore-doped magnesium oxide is (1-6) to 20. According to the method disclosed by the invention, the mineral admixture is doped into a ternary material system of magnesium oxide-magnesium chloride-water in the preparation process of the magnesium cement material, so that the hydration heat release of the magnesium cement material is reduced; the induction period end time and the acceleration period end time are prolonged; and meanwhile, the amount of the raw material magnesium oxide is replaced with addition of the mineral admixture, so that the cost of the magnesium cement material can be reduced to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for reducing the hydration heat release of magnesia gelling materials. Background technique [0002] Magnesium cementitious material is an air-hardening gel material invented by French scientist Sorrel, also known as "Sorrel cement" or "magnesium cement", which has early strength, high strength, fast setting, strong cohesion, low alkalinity, Wear-resistant, fire-proof, good decorative effect, anti-salt brine corrosion and other characteristics, so it has attracted extensive attention from all over the world. Magnesite products with magnesium cement as the gel material have been widely used in the fields of building materials and wood conservation, and have made important contributions to the country's energy saving, capital saving, and emission reduction. [0003] Magnesia gelling material is an air-hardening gel material made by mixing magnesium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B9/02
Inventor 文静肖学英余红发李颖董金美郑卫新常成功
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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