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A prestressed channel grouting agent and its preparation and use method

A tunnel grouting and prestressing technology, which is applied in the field of cement concrete building materials, can solve the problems of temperature sensitivity, large temperature influence, and difficulty in use, and achieve the effect of steady increase in strength, wide sources, and avoidance of strength shrinkage

Active Publication Date: 2017-07-18
WUHAN BILLION TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the existing setting time regulators for Portland cement use inorganic salts and organic polymer materials, which are sensitive to temperature and easily cause later strength shrinkage. However, mineral modified composite materials are used as cement The coagulation time regulator can solve the above problems well
[0004] There are many types of prestressed tunnel grouting agents on the market, but most of them are greatly affected by temperature, and it is difficult to use them in extreme temperature conditions

Method used

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  • A prestressed channel grouting agent and its preparation and use method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh the raw materials according to the weight ratio, specifically: polycarboxylate water reducer 4%, microbead physical water reducer 2%, Brunei gum 0.4%, defoamer 0.6%, 200 mesh quartz powder 34%, clinker 19%, 16% dihydrate gypsum, 16% anhydrous anhydrite, and 8% fly ash, which are ground and mixed uniformly by a ball mill to make a grouting agent.

[0026] Weigh 8% of the grouting agent and 92% of 52.5 grade ordinary Portland cement by weight, and mix them evenly with a dry powder mixer to make the grout.

[0027] The ambient temperature is 20±5°C, the water-binder ratio is 0.26, after adding water to the mixer, turn on the mixer, the mixer speed is 1000r / min, the line speed is 15m / s, and then evenly add the press slurry to the mixer, and stir for 5 minutes after the powder is added. After the pulping is completed, the grouting is carried out. The prepared cement slurry was tested according to "Technical Specifications for Highway Bridge and Culvert Construction" J...

Embodiment 2

[0029] Weigh the raw materials according to the weight ratio, specifically: 6% of naphthalene-based water reducer, 4% of microbead physical water reducer, 0.2% of white carbon black, 0.8% of defoamer, 16% of 400 mesh alum stone powder, and 23% of clinker , 14% of hemihydraulic gypsum, 20% of dihydrate gypsum, 6% of slag powder, 8% of micro-silica fume, and 2% of aluminum sulfate, and use a ball mill to grind and mix evenly to make a grouting agent.

[0030] Weigh 10% of grouting agent and 90% of 52.5R grade Portland cement by weight, and mix them evenly with a dry powder mixer to make a grout.

[0031] Ambient temperature -5±5°C, water-to-binder ratio 0.24, add water to the mixer, turn on the mixer, the mixer speed is 1000r / min, the line speed is 15m / s, then evenly add the press slurry to the mixer, and stir for 3 minutes after the powder is added , After the pulping is completed, press the pulp. The prepared cement slurry was tested according to "Technical Specifications for...

Embodiment 3

[0033] Weigh the raw materials according to the weight ratio, specifically: polycarboxylate water reducer 3%, organically modified bentonite 0.4%, defoamer 0.6%, 600 mesh limestone powder 44%, clinker 26%, anhydrite 23% %, 3% slag powder, use a ball mill to grind and mix evenly to make a grouting agent.

[0034]Weigh 12% of the grouting agent and 88% of 42.5 grade ordinary Portland cement by weight, and mix them evenly with a dry powder mixer to make the grout.

[0035] The ambient temperature is 40±5°C, the water-binder ratio is 0.28, after adding water to the mixer, turn on the mixer, the mixer speed is 1000r / min, and the line speed is 15m / s, then evenly add the press slurry to the mixer, and stir for 5 minutes after the powder is added. After the pulping is completed, the grouting is carried out. The performance of the prepared cement slurry was tested according to "Technical Specifications for Highway Bridge and Culvert Construction" JTG / T F50-2011 and "Highway Engineerin...

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Abstract

The invention provides a prestressed channel grouting agent with the characteristics of high fluidity and no bleeding, which comprises the following components: 2-10% of water reducing agent, 0.1-10% of viscosity modifier, and 0.0% of defoaming agent ~1%, setting time regulator 35~78%; the setting time regulator includes the following components: clinker 28~52%; gypsum 42~68%; filler 4~30%; %; The present invention also provides a preparation method and a use method of the above-mentioned prestressed channel grouting agent. Because the present invention contains the cement setting time regulator, it can adjust the setting time of the cement-based composite material according to the change of external air temperature, so as to ensure the normal use and normal growth of the strength of the cement-based composite material. At the same time, the addition of the cement setting time regulator makes the Cement-based composites produce micro-expansion in the later stage.

Description

technical field [0001] The invention provides a prestressed channel grouting agent, in particular to a prestressed channel grouting agent added with a setting time regulator, and also relates to a preparation method and a use method of the above-mentioned channel grouting agent, belonging to cement concrete field of building materials. Background technique [0002] Cement-based composite materials are significantly affected by temperature changes during use. During construction, when the temperature is lower than 0°C, the cement-based materials will suffer from diseases such as excessive setting time, severe bleeding, and even frost heaving; when the temperature is higher than 40°C, Cement-based materials set too quickly to prevent normal construction. When the above problems arise, a series of auxiliary measures are often used to ensure the construction quality, such as steam curing and other thermal insulation measures for prestressed tunnel grouting construction in winte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/24C04B24/22C04B24/12
Inventor 许亮孙艳梅海军
Owner WUHAN BILLION TECH DEV CO LTD
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