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Composite modifier used in magnesium-chlorine cement and application thereof

A composite modifier and a technology for magnesium-chloride cement, which is applied in the field of preparing the magnesium-chloride cement and magnesium-chloride cement, can solve the problems of poor water resistance of fly ash modification, and achieve low compressive strength attenuation, water resistance and high water resistance. Early strength increase, changing the effect of early strength low

Active Publication Date: 2012-11-28
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the water resistance of fly ash modification is far inferior to that of phosphoric acid and phosphate

Method used

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  • Composite modifier used in magnesium-chlorine cement and application thereof
  • Composite modifier used in magnesium-chlorine cement and application thereof
  • Composite modifier used in magnesium-chlorine cement and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Dissolve 12-18 parts of magnesium chloride with a Baume degree of Be25°-30° in 14-21 parts of water to form a mixed solution, and then add 30-46 parts of magnesium oxide to the above mixed solution, and form a magnesium chloride cement slurry after fully and uniformly stirring. The well-stirred cement paste is poured into shape, demoulded after initial setting, and cured in the air until it ages. Among them, the active content of the magnesium powder using magnesium oxide is ≥70.0%, and the fineness of the magnesium oxide is 120 mesh sieve balance≤2%. Corresponding tests were carried out on the prepared magnesium chloride cement samples, and the test results are listed in Table 1.

Embodiment 2

[0034] Dissolve 12-18 parts of Baume degree of Be25°-30° magnesium chloride in 14-21 parts of water to form a mixed solution, mix 30-46 parts of magnesium oxide and 16-24 parts of fly ash and add the above mixed solution, fully Stir evenly to form magnesium chloride cement slurry. The well-stirred cement paste is poured into shape, demolded after initial setting, and cured in the air until it ages. Among them, the active content of the magnesium powder using magnesium oxide is ≥70.0%, and the fineness of the magnesium oxide is 120 mesh sieve balance≤2%. Corresponding tests were carried out on the prepared magnesium chloride cement samples, and the test results are listed in Table 1.

Embodiment 3

[0036] Dissolve 12-18 parts of Baume degrees Be25°-30° magnesium chloride, 0.7-1.3 parts of phosphoric acid in 14-21 parts of water to form a mixed solution, add 30-46 parts of magnesium oxide to the above mixed solution, and stir fully and evenly to form magnesium chloride cement paste. The well-stirred cement paste is poured into shape, demoulded after initial setting, and cured in the air until it ages. Among them, the active content of the magnesium powder using magnesium oxide is ≥70.0%, and the fineness of the magnesium oxide is 120 mesh sieve balance≤2%. Corresponding tests were carried out on the prepared magnesium chloride cement samples, and the test results are listed in Table 1.

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Abstract

The invention provides a composite modifier used in magnesium-chlorine cement, a magnesium-chlorine cement using the composite modifier and a method for preparing the magnesium-chlorine cement. When the composite modifier provided by the invention is used for compositely modifying the magnesium-chlorine cement, the water resistance and early strength of the cement are obviously enhanced, the softening coefficient is up to 0.90, and the compression strength attenuates slightly and still remains at the high level of 64.4MPa after water soaking for 28 days; and thus, the composite modifier greatly overcomes the defect of low early strength in phosphoric acid modification, and has obvious comprehensive modification effects.

Description

technical field [0001] The invention relates to the field of composition modifiers, in particular to a composite modifier used in magnesium chloride cement, magnesium chloride cement using the composite modifier and a method for preparing the magnesium chloride cement. Background technique [0002] Magnesium chloride cementitious materials have the advantages of fast curing in the air, high strength (dozens of Mpa higher than ordinary Portland cement), good sound insulation effect, good heat preservation effect, and good fireproof effect, but due to poor water resistance and other shortcomings, serious limit its application. In the case of long-term contact with water, the strength of magnesium chloride cementitious materials will be greatly reduced. At room temperature, its main hydration product 3Mg(OH) 2 · MgCl 2 ·8H 2 O, referred to as 3 phases and 5Mg(OH) 2 · MgCl 2 ·8H 2 O, referred to as 5-phase, the equation of the hydrolysis reaction under the action of water ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C04B28/32
Inventor 王路明
Owner YANCHENG INST OF TECH