High-performance prestressing duct grouting agent and preparation method thereof

A pore grouting and prestressing technology, which is applied in the field of building materials, can solve the problems of unsatisfactory slurry fluidity, unstable aluminum powder gas generation, and difficulty in controlling the speed, so as to achieve stable and uniform material composition, improve rheological properties, The effect of less water consumption

Inactive Publication Date: 2013-02-20
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Checked previous patent documents, Chinese patent CN1559960A "post-tensioned high-performance grouting admixture for bonded prestressed concrete", Chinese patent CN101462861A "post-tensioning method The grouting materials for prestressed concrete tunnels and their preparation methods all use aluminum powder to generate gas to compensate for the shrinkage in the plastic stage, but the amount of gas generated by aluminum powder as an expansion source is unstable, the speed is too fast to control, and it is easy to cause hydrogen embrittlement
The fluidity in the Chinese patent CN101602589A "Post-tensioned prestressed...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] According to the weight percentage, the formula of the special admixture for prestressing channel grouting is:

[0040] FOX Talon 101 polycarboxylate superplasticizer (belonging to polycarboxylate superplasticizer): 3.5%, its water reducing rate> 30%, the same below;

[0041] Silica fume: 30%, SiO in said silica fume 2 content>90%, the same below;

[0042] Wenlun rubber: 0.1%;

[0043] Vinyl acetate and ethylene binary copolymerized redispersible rubber powder: 5%;

[0044] N,N-Dinitrosopentamethylenetetramine: 0.5%;

[0045] Calcium sulfoaluminate expansion agent UEA: 60.9%, its limit expansion rate ≥ 0.025% in 7 days in water, the same below;

[0046] The production process is as follows: weighing according to the above-mentioned formula of the present invention, adding a VSH-3m 3 Mix and stir in a double-helix conical mixer, and mix for 10 minutes to get a uniform product.

[0047] The method of use is: on the construction site, weigh according to the weight ra...

Embodiment 2

[0050] According to the weight percentage, the formula of the special admixture for prestressing channel grouting is:

[0051] FOX Talon 101 polycarboxylate superplasticizer: 4%;

[0052] Silica fume: 25%;

[0053] Wenlun rubber: 0.1%;

[0054] Vinyl acetate and ethylene binary copolymerized redispersible rubber powder: 10%;

[0055] N,N-Dinitrosopentamethylenetetramine: 0.5%;

[0056] Calcium sulfoaluminate expansion agent UEA: 60.4%;

[0057] The production process is as follows: weighing according to the above-mentioned formula of the present invention, adding a VSH-3m 3 Mix and stir in a type double-helix conical mixer, and mix for 12 minutes to obtain a uniform product.

[0058] The method of use is as follows: weigh the grouting admixture, grade 52.5 ordinary Portland cement, and mixing water at the construction site at a ratio of 10:90:27, and perform other operations according to Example 1. Compared with Example 1, the press grout prepared in this embodiment ado...

Embodiment 3

[0061] According to the weight percentage, the formula of the special admixture for prestressing channel grouting is:

[0062] MNC-AS type amino water reducer (belonging to sulfamate water reducer): 4%;

[0063] Silica fume: 25%;

[0064] Wenlun rubber: 0.1%;

[0065] Vinyl acetate and ethylene binary copolymerized redispersible rubber powder: 4%;

[0066] N,N-Dinitrosopentamethylenetetramine: 0.3%;

[0067] Calcium sulfoaluminate expansion agent UEA: 66.2%;

[0068] Sodium gluconate: 0.4%;

[0069] The production process is as follows: weighing according to the above-mentioned formula of the present invention, adding a VSH-3m 3 Mix and stir in a type double-helix conical mixer, and mix for 14 minutes to obtain a uniform product.

[0070] The method of use is as follows: weigh the grouting admixture, grade 42.5 ordinary Portland cement, and mixing water at the construction site at a ratio of 12:88:29, and perform other operations according to Example 1. Compared wit...

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PUM

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Abstract

The invention discloses a high-performance prestressing duct grouting agent which is prepared by the following components, by weight, 1-10% of water reduction component, 15-40% of water retention component, 1-10% of plastic-reserving component, 0.03-0.3% of tackifying component, 0-0.5% of delayed coagulation component, 0.1-1% of plasticity expansion component and 50-70% of later-stage volume expansion component. By mixing the high-performance prestressing duct grouting agent into cement according to a ratio of 10%, grout can obtain high mobility and high plasticity stability, a segregation layering phenomenon is greatly reduced, bleeding is avoided, and grouting is full. Whole-process volume stability of the prepared grout is high, micro expansion of plasticity and hardening stages can effectively compensate various contractions. Early strength and high-strength performance of the grout are prominent, durability is good, and the grout is applicable to various prestressing duct constructions. Simultaneously, bag-packaged additives are even in composition compared with additives prepared on the spot, transportation and comprehensive cost is low, and technical economical benefit is remarkable.

Description

Technical field [0001] The present invention belongs to the field of building materials and involves a prestressed touct grinding exterior agent. Specifically, it is a high -performance premature premium grinding agent and its preparatory method for prestressed reinforced concrete holes. Background technique [0002] Later, Zhang Zhangya's concrete technology, due to the advantages of reducing structured self -weight and improving structural stress, has been widely used in large span space and towering tower mast structure.However, these advantages are based on the good bonding of post -tensioned stress reinforcement and concrete structure.In the future, there will be more and more projects such as architectural structures, underground architecture, dam, and marine engineering structures, and there will be more and more prestressed projects, and the demand for sewing materials will increase rapidly.The quality of the tunnel grouting will directly affect the safety and reliability...

Claims

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Application Information

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IPC IPC(8): C04B24/26C04B24/38
Inventor 李北星宋小婧周明凯
Owner WUHAN UNIV OF TECH
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