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Reinforcing and repairing grouting material for construction in minus-temperature environment

A grouting material and environment technology, applied in the field of grouting material, reinforcement and repairing grouting material, can solve the problems that grouting material cannot be constructed in a negative temperature environment, the performance of grouting material is affected, and construction is affected.

Inactive Publication Date: 2010-11-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When these products are prepared, there are many kinds of raw materials required, and the amount of each additive has a significant impact on the performance of the grouting material. In addition, the more important thing is that these grouting materials cannot be constructed in a negative temperature environment, which has seriously affected the construction in our country. Possibility of construction in winter in Northeast my country

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The components and their weight percentages in this example are: 7% magnesium oxide, 35% potassium dihydrogen phosphate, 30% quartz sand, 25% fly ash, 1% boric acid and 2% calcium lignosulfonate.

[0029] Among them: quartz sand adopts commercially available construction sand, which meets the following gradation:

[0030] 2.500~5.000mm 5% weight ratio

[0031] 1.250~2.500mm 25% weight ratio

[0032] 0.315~1.250mm 55% weight ratio

[0033] <0.315mm 15% by weight.

[0034] The above components are prepared according to the aforementioned process to prepare the grouting material. At an ambient temperature of minus 18 degrees, tap water with a powder mass of 0.20 was added and stirred for 3 minutes to obtain a flowable slurry. Its fluidity reaches 280mm, its 1d strength is 15MPa, 3d strength is 35MPa, 28d strength is 60MPa, and its 1d vertical expansion rate is 0.45%.

Embodiment 2

[0036] The components and their weight percentages in this embodiment are: 13% magnesium oxide, 25% potassium dihydrogen phosphate, 45% quartz sand, 15% fly ash, 1% citric acid and 1% calcium lignosulfonate.

[0037] Among them: quartz sand adopts commercially available construction sand, which meets the following gradation:

[0038] 2.500~5.000mm 0% weight ratio

[0039] 1.250~2.500mm 35% weight ratio

[0040] 0.315~1.250mm 55% weight ratio

[0041] <0.315mm 10% by weight.

[0042] The above components are prepared according to the aforementioned process to prepare the grouting material. At an ambient temperature of minus 10 degrees, tap water with a powder mass of 0.24 was added and stirred for 3 minutes to obtain a flowable slurry. Its fluidity reaches 290mm, its 1d strength is 20MPa, 3d strength is 40MPa, 28d strength is 65MPa, and its 1d vertical expansion rate is 0.50%.

Embodiment 3

[0044] The components and their weight percentages in this embodiment are: 10% magnesium oxide, 30% potassium dihydrogen phosphate, 37% quartz sand, 20% fly ash, 1.5% borax and 1.5% sodium lignosulfonate.

[0045] Among them: quartz sand adopts commercially available construction sand, which meets the following gradation:

[0046] 2.500~5.000mm 2% weight ratio

[0047] 1.250~2.500mm 20% weight ratio

[0048] 0.315~1.250mm 65% weight ratio

[0049] <0.315mm 13% by weight.

[0050] The above components are prepared according to the aforementioned process to prepare the grouting material. At an ambient temperature of minus 5 degrees, tap water of 0.25% of the mass of the powder was added and stirred for 3 minutes to obtain a flowable slurry. Its fluidity reaches 300mm, its 1d strength is 23MPa, 3d strength is 40MPa, 28d strength is 65MPa, and its 1d vertical expansion rate is 0.51%.

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Abstract

The invention provides a reinforcing and repairing grouting material for construction in a minus-temperature environment in the technical field of construction materials, which comprises the following components in percentage by weight: 7 to 13 percent of magnesium oxide, 25 to 35 percent of potassium dihydrogen phosphate, 5 to 45 percent of quartz sand, 15 to 25 percent of fly ash, 1 to 2 percent of boric acid or borax or citric acid, and 1 to 2 percent of calcium lignosulfonate or sodium lignosulphonate. Compared with the prior art, the material has the characteristics of constructing and condensing to become hard to generate strength at the temperature of 18 DEG C below zero, along with high mobility, high early strength and the like.

Description

technical field [0001] The invention relates to a grouting material in the technical field of building materials, in particular to a reinforcement and repairing grouting material used for construction in a negative temperature environment. Background technique [0002] Grouting materials first appeared due to military needs in World War II, and were applied to industrial sectors in developed countries in the 1950s. At present, high-strength grouting materials are widely used in mechanical equipment installation and reinforcement repair projects in the world. In the early 1970s, in order to meet the needs of some large-scale imported equipment installations, my country began the research and development of grouting materials, and achieved success very quickly. In recent years, the use of grouting materials has developed from the traditional secondary grouting materials used for mechanical equipment installation to the reinforcement and repair of concrete structures. Moreove...

Claims

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Application Information

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IPC IPC(8): C04B28/30
CPCC04B2111/70C04B2/102C04B2103/001C04B28/105Y02W30/91C04B14/06C04B18/08C04B20/0076C04B20/008C04B22/0013C04B22/16C04B24/18C04B24/06
Inventor 陈兵林奇
Owner SHANGHAI JIAO TONG UNIV
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