High-compactness cement paste for vacuum grouting and manufacturing method thereof

A technology of cement paste and manufacturing method, which is applied to the manufacture of vacuum grouting cement paste, vacuum grouting cement paste, and grouting materials for prestressing systems in civil construction projects, and can solve the problem of increasing secondary grouting links and unfavorable prestress Project construction quality control, cumbersome process and other issues, to achieve the effect of reducing investment, improving compactness, and low bleeding rate

Active Publication Date: 2012-05-02
CHINA NUCLEAR IND HUAXING CONSTR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This construction method is cumbersome, and the added secondary grouting link is not conducive to the quality control of prestressed engineering construction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Prepare raw materials according to the following components and weight content: Portland cement: 300 parts; polycarboxylate water reducer: 2.7 parts; polycarboxylate retarder: 1.5 parts; water: 93 parts; slurry Thixotropic agent: 3 parts;

[0020] (2) First inject water into the slurry mixing tank, add polycarboxylate water reducer and polycarboxylate retarder at the same time and mix well;

[0021] (3) Add Portland cement while stirring. The cement will be cut within 2 minutes. After the cement is cut, continue to stir. Stir for a total of 4 minutes including the cement cutting time to obtain a retarded slurry. , testing the fluidity of the retarded slurry is 11 seconds;

[0022] (4) Place the retarded slurry in a slurry storage tank with four agitators and let it stand for 1 hour;

[0023] (5) Start the agitator for stirring, add the slurry thixotropic agent while stirring, and continue stirring for 15 seconds after adding the slurry thixotropic agent to obtain ...

Embodiment 2

[0027] (1) Prepare raw materials according to the following components and weight content: Portland cement: 300 parts; polycarboxylate water reducer: 3.3 parts; polycarboxylate retarder: 1.9 parts; water: 96 parts; slurry Thixotropic agent: 4.5 parts;

[0028] (2) First inject water into the slurry mixing tank, add polycarboxylate water reducer and polycarboxylate retarder at the same time and mix well;

[0029] (3) Add Portland cement while stirring. The cement will be cut within 2 minutes. After the cement is cut, continue to stir. Stir for a total of 5 minutes including the cement cutting time to obtain a retarded slurry. , testing the fluidity of the retarded slurry is 11.2 seconds;

[0030] (4) Place the retarded slurry in a slurry storage tank with four agitators and let it stand for 1 hour;

[0031] (5) Start the agitator for stirring, add the slurry thixotropic agent while stirring, and continue stirring for 20 seconds after adding the slurry thixotropic agent to obt...

Embodiment 3

[0035] (1) Prepare raw materials according to the following components and weight content: Portland cement: 300 parts; polycarboxylate water reducer: 3.9 parts; polycarboxylate retarder: 2.4 parts; water: 99 parts; slurry Thixotropic agent: 6 parts;

[0036] (2) First inject water into the slurry mixing tank, add polycarboxylate water reducer and polycarboxylate retarder at the same time and mix well;

[0037] (3) Add Portland cement while stirring. The cement will be cut within 2 minutes. After the cement is cut, continue to stir. Stir for a total of 6 minutes including the cement cutting time to obtain a retarded slurry. , testing the fluidity of the retarded slurry is 12 seconds;

[0038] (4) Place the retarded slurry in a slurry storage tank with four agitators and let it stand for 1 hour;

[0039] (5) Start the agitator for stirring, add the slurry thixotropic agent while stirring, and continue stirring for 30 seconds after adding the slurry thixotropic agent to obtain ...

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Abstract

The invention provides high-compactness cement paste for vacuum grouting and a manufacturing method thereof, and belongs to the technical field of pre-stress engineering. The manufacturing method comprises the following steps of 1, preparing 300 parts by weight of portland cement, 2.7 to 3.9 parts by weight of a polycarboxylic acid water reducer, 1.5 to 2.4 parts by weight of a polycarboxylic acid retarder, 93 to 99 parts by weight of water and 3 to 6 parts by weight of a paste thixotropic agent, 2, pouring water into a paste agitator tank, and simultaneously, adding the polycarboxylic acid water reducer and the polycarboxylic acid retarder into the paste agitator tank, and uniformly mixing, 3, adding cement with stirring and continuously stirring to obtain retarded paste, wherein the total time of feeding and stirring is in a range of 4 to 6 minutes, 4, putting the retarded paste into a paste storage tank with a stirrer and standing for 1 hour, and 5, starting the stirrer for stirring, adding the paste thixotropic agent into the retarded paste with stirring, and after addition of the paste thixotropic agent, sequentially stirring for 15 to 30 seconds to obtain thixotropic paste. The thixotropic paste can realize single-step grouting formation of a pipe having a high bending degree and thus work efficiency and construction quality are greatly improved.

Description

technical field [0001] The invention relates to a high-density vacuum grouting cement paste. The cement paste is a material for grouting prestressed pipes in nuclear power plants. It is especially suitable for grouting bent pipes with a height difference of more than 1.2 meters, and is also suitable for prestressed pipes in civil construction projects. System grouting materials. The invention also relates to a method for manufacturing a high-density vacuum grouting cement paste, which belongs to the technical field of prestressed engineering. Background technique [0002] The steel beams of the prestressing system of nuclear power plants are generally divided into horizontal steel beams, vertical steel beams, and gamma steel beams. These steel beams are all prestressed by post-tensioning. In order to prevent the external harmful medium from eroding the prestressed steel strand and ensure the design life of the prestressed project, it is necessary to fill the prestressed tun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
Inventor 王龙黄权余黄昏陶玉平冯善业方辉煌
Owner CHINA NUCLEAR IND HUAXING CONSTR
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