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Post-tensioning prestressed concrete beam pore high-strength grouting agent

A post-tensioned prestressed concrete beam technology, which is applied in the field of post-tensioned prestressed beam channel grouting agent for concrete, which can solve the problems that the anti-corrosion and expansion performance requirements cannot be met, and the grouting agent cannot achieve zero bleeding. , to achieve the effect of low cost, easy operation and high strength grouting index

Active Publication Date: 2014-09-03
江苏瑞海新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The grouting agent cannot achieve zero bleeding, and cannot meet the requirements of anti-corrosion and expansion properties

Method used

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  • Post-tensioning prestressed concrete beam pore high-strength grouting agent
  • Post-tensioning prestressed concrete beam pore high-strength grouting agent
  • Post-tensioning prestressed concrete beam pore high-strength grouting agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The purpose of this embodiment is to achieve the minimum water-reducing effect, meet the engineering crack prevention, low-cost grouting agent that resists carbonation and chlorine salt erosion, and the components are as follows by weight %:

[0042] Polycarboxylate superplasticizer 2%, polyacrylonitrile fiber 3%, superfine active micropowder 6%, methyl-based polymer 0.3%, high-durability mineral admixture 50%, citric acid 0.2%, rosin 0.5%, oxidation Magnesium 38%.

[0043] The above-mentioned components are crushed into granules that can be put into the grinder, mixed evenly, and the mixed material is ground until the particle size reaches 300-500 mesh, and then mixed with polyacrylonitrile fibers to prepare the A-type channel grouting agent.

[0044] How to use type A hole grouting agent:

[0045] method 1:

[0046] The above-mentioned present invention is by cement and water ratio:

[0047] 1. Grouting agent 0.45KG cement 2.55KG water 0.78KG (water-binder ratio: 0...

Embodiment 2

[0054] The purpose of this example is to achieve a good water-reducing effect, and at the same time meet the high engineering crack resistance, anti-carbonization degree and chlorine salt corrosion resistance of the grouting agent. The components are as follows by weight %: polycarboxylate water reducer 11 %, 5% polypropylene fiber, 10% ultrafine active micropowder, 0.3% methyl-based polymer, 35% high-durability mineral admixture, 0.2% citric acid, 0.5% rosin, and 38% magnesium oxide.

[0055] The above-mentioned components are broken into grindable granules, mixed evenly, and the mixed material is ground until the particle size reaches 300-500 mesh, and then mixed with polyacrylonitrile fibers to obtain a B-type channel grouting agent.

[0056] The B-type pore grouting agent is best to use the third method recommended above. The following is the test result of using the third method in cement:

[0057] Its performance indicators are as follows:

[0058]

Embodiment 3

[0060] The purpose of this example is to achieve a medium water-reducing effect, and at the same time meet the high engineering crack resistance, anti-carbonization degree and chlorine salt corrosion resistance of the grouting agent. The components are as follows by weight %: polycarboxylate water reducer 6 %, 5% polypropylene fiber, 8% superfine active micropowder, 0.3% methyl-based polymer, 45% high-durability mineral admixture, 0.2% citric acid, 0.5% rosin, and 35% magnesium oxide.

[0061] The above-mentioned components are broken into granules that can be fed into the grinder, mixed evenly, and the mixed material is ground until the particle size reaches 300-500 mesh, and then mixed with polyacrylonitrile fibers to prepare a C-type channel grouting agent.

[0062]The C-type pore grouting agent is best to use the third method recommended above. The following is the test result of using the third method in cement:

[0063] Its performance indicators are as follows:

[0064...

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Abstract

The present invention relates to a post-tensioning prestressed concrete beam pore high-strength grouting agent which is low in water-binder ratio, high in fluidity, and zero in bleeding. The post-tensioning prestressed concrete beam pore high-strength grouting agent includes by weight: 2-11% of a water reducing component, 0.3-0.6% of a plastic stage expansion component, 3-5% of a sedimentation preventing component, 6-10% of an ultrafine active micropowder component, 0.01-0.5% of a water retention component, 40-50% of a high durability mineral admixture component, 0-0.5% of a delayed coagulation component, 0-0.5% of an air entraining component, and 40-50% of a low-alkaline post-expansion component, wherein the ultrafine active micropowder component is silica fume or nano-silica or a mixture of silica fume and nano-silica, the high durability mineral admixture component includes ash and one or more selected from limestone, Al2O3, silicide, CaO, potassium oxide and mica, and the low-alkaline post-expansion component is magnesium oxide. The post-tensioning prestressed concrete beam pore high-strength grouting agent has the characteristics of wide raw material source, low cost, easy operation and no pollution.

Description

technical field [0001] The patent application of the present invention relates to a post-tensioned prestressed beam channel grouting agent for concrete. Background technique [0002] Before the grouting of special prestressed tunnels, only cement slurry was used as filler, which resulted in many defects, such as not dense tunnels, easy shrinkage, easy bleeding, low strength, etc., so the prestressed tendons and concrete structures cannot be guaranteed. The effective stress transfer between people cannot eliminate the fatigue damage of the anchor due to stress changes, and cannot protect the prestressed tendons from external damage and corrosion. Quality, but still can not meet the requirements of the current bridge and high school, the JTG / TF50-2011 standard in 2012, the standard index requires high indicators such as low water-binder ratio, no bleeding, no shrinkage, etc., which makes many enterprises unable to adapt current specification. [0003] Such as the invention p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38C04B24/16
Inventor 蒋成飞李强
Owner 江苏瑞海新材料科技有限公司
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