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Pre-stressed duct grouting agent, and preparation and application methods thereof

A channel grouting and prestressing technology, which is applied in the preparation of the above-mentioned channel grouting agent, the prestressed channel grouting agent added with a setting time regulator, and the field of prestressed channel grouting agent, which can solve the problem that the air temperature is greatly affected, Sensitivity to temperature effects, strength shrinkage, etc., to achieve the effects of wide sources, steady increase in strength, and low cost

Active Publication Date: 2016-01-27
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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  • Pre-stressed duct grouting agent, and preparation and application methods thereof

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 grouting agent and 92% of 52.5 grade ordinary Portland cement by weight, and mix them evenly with a dry powder mixer to make a 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" JTG / TF5...

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

[0031] Ambient temperature -5±5°C, water-binder ratio 0.24, after adding 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 Specif...

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 / TF50-2011 and "Highway Engineering...

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Abstract

The invention provides a pre-stressed duct grouting agent which has the characteristics of high fluidity, bleeding prevention and the like. The pre-stressed duct grouting agent comprises the following components: 2 to 10 percent of a water reducing agent, 0.1 to 10 percent of a viscosity modifying agent, 0 to 1 percent of a defoaming agent, and 35 to 78 percent of a coagulation time regulating agent; the coagulation time regulating agent comprises the following components: 28 to 52 percent of clinker, 42 to 68 percent of plaster, 4 to 30 percent of fillers, and 0 to 3 percent of a coagulation accelerator. The invention further provides a preparation method and an application method of the pre-stressed duct grouting agent. The invention has the advantages that the pre-stressed duct grouting agent contains the cement coagulation time regulating agent, so that the coagulation time of a cement-based composite material can be regulated based on external temperature changes to guarantee the normal use and normal strength growth of the cement-based composite material; meanwhile, the cement-based composite material achieves micro-expansion at the later stage due to the addition of the cement coagulation time regulating agent.

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 Applications(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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