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Magnesium oxysulfate-based inorganic composite gelling material with high flexural strength

A technology of cementitious material and inorganic composite, which is applied in the field of high flexural magnesium oxysulfoxide-based inorganic composite cementitious materials, can solve limited problems, and achieves improved flexural strength and compressive strength, improved water resistance, and improved compactness. Effect

Active Publication Date: 2017-06-23
NINGBO UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the research reports on the influence of mineral admixtures on the properties of magnesium oxysulfide cementitious materials are still very limited.

Method used

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  • Magnesium oxysulfate-based inorganic composite gelling material with high flexural strength
  • Magnesium oxysulfate-based inorganic composite gelling material with high flexural strength
  • Magnesium oxysulfate-based inorganic composite gelling material with high flexural strength

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Embodiment 1

[0029] The high anti-folding magnesium oxysulfide-based inorganic composite gelling material of embodiment 1, by weight, the composition of the gelling material is: 352 parts of lightly burned magnesium oxide powder, 154 parts of magnesium sulfate heptahydrate, 1.9 parts of citric acid And 19 parts of silica fume.

Embodiment 2

[0030] The high anti-folding magnesium oxysulfide-based inorganic composite gelling material of embodiment 2, by weight, the composition of the gelling material is: 334 parts of lightly burned magnesium oxide powder, 146 parts of magnesium sulfate heptahydrate, 1.9 parts of citric acid And 37 parts of silica fume.

[0031] According to the national standard GB175-2007 "Universal Portland Cement" and GB17671-1999 "Cement Mortar Strength Test Method", cement, standard sand and water are formulated into mortar according to the specified ratio (1:3:0.5), and made The 40mm×40mm×160mm specimens were removed from the mold and cured to a certain age (3d and 28d) under standard curing conditions to measure their compressive strength and flexural strength. The determination of compressive strength and flexural strength was compared with ordinary Portland cement. Due to MgSO 4 ·7H 2 O contains water, so it is necessary to adjust the quality of light-burned magnesia powder, magnesium s...

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Abstract

The invention discloses a magnesium oxysulfate-based inorganic composite gelling material with high flexural strength. The magnesium oxysulfate-based inorganic composite gelling material is prepared from the following components in parts by weight: 334 to 352 parts of light-calcined magnesium oxide powder, 146 to 154 parts of magnesium sulfate heptahydrate, 1.48 to 2.23 parts of citric acid and 19 to 37 parts of silicon ash. The magnesium oxysulfate-based inorganic composite gelling material has the advantages that by adding the citric acid, the modifying function is realized; by adding the silicon ash, the flexural strength and compressive strength are improved; in each age period, the mechanical property is excellent, and the flexural strength in the 28-day age period is 22 to 23MPa; compared with common portland cement P.0425 with the same water-cement ratio, the flexural strength is increased by 238%; the corresponding softening coefficient of a prepared standard gelling mortar specimen is about 0.85, so that the water-resistant property is higher; the magnesium oxysulfate-based inorganic composite gelling material is completely suitable for important structures soaked in water or in damp environments.

Description

technical field [0001] The invention relates to a cementitious material for construction, in particular to a high-resistance magnesium oxysulfide-based inorganic composite cementitious material. The flexural strength of the age reaches 22-23MPa, which is 238% higher than that of ordinary portland cement P.O425 with the same water-cement ratio, and the corresponding softening coefficient of the prepared standard mortar specimen reaches About 0.85, it can be completely applied to important structures soaked in water or in humid environments. Background technique [0002] Magnesium oxysulfide cement is made of magnesium sulfate solution as a blending agent, and a certain concentration of MgSO 4 MgO-MgSO composed of solution and lightly burned MgO 4 -H 2 O Ternary gelling system. The cement has the characteristics of fast setting and hardening, high early strength, good cohesiveness, no need for wet curing, low thermal conductivity, high fire resistance, good wear resistance...

Claims

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Application Information

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IPC IPC(8): C04B9/06
CPCC04B9/06
Inventor 朱杰兆巴明芳薛涛
Owner NINGBO UNIV
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