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Self-supporting high-bonding prestressed tunnel pressure slurry and preparation method thereof

A channel grouting and high bonding technology, applied in the field of civil engineering construction, can solve the problems of low bonding force between steel bars and channel walls, corrosion of prestressed bars, and poor grouting, so as to reduce the ability of segregation and bleeding, The effect of high early strength and high adhesion

Active Publication Date: 2020-05-29
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The grouting material is more stable than the grouting agent, and the preparation is simple, but the cost is higher
For the latter, the water-cement ratio is too large, the layered bleeding is serious, the shrinkage after hardening is large, the early strength is low, the adhesion to the steel bar and the tunnel wall is not high, and it is easy to cause problems such as insufficient grouting and corrosion of prestressed tendons.

Method used

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  • Self-supporting high-bonding prestressed tunnel pressure slurry and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This example provides a kind of prestressed tunnel pressure slurry, by weight, the raw materials include the following composition: 80% ordinary Portland cement, 6% porous pozzolan, 8% modified chlorite powder, 4% vermiculite powder, 0.01% thickener, 1.5% U-shaped expansion agent, 0.25% new ester polycarboxylate water reducer, 0.05% tributyl phosphate defoamer, and the balance is water.

Embodiment 2

[0032] This example provides a kind of prestressed tunnel pressure slurry, by weight, the raw materials include the following composition: 80% ordinary Portland cement, 8% porous pozzolan, 6% modified chlorite powder, 1% MIM stainless steel Powder, 2% vermiculite powder, 0.01% thickener, 1.5% U-shaped expansion agent, 0.3% new ester polycarboxylate superplasticizer, 0.05% tributyl phosphate defoamer, and the balance is water.

Embodiment 3

[0034] This example provides a kind of prestressed tunnel pressure slurry, by weight, the raw materials include the following composition: 80% ordinary Portland cement, 10% porous pozzolan, 6% modified chlorite powder, 1% MIM stainless steel Powder, 2% vermiculite powder, 0.015% thickener, 1% U-shaped expansion agent, 0.3% new ester polycarboxylate superplasticizer, 0.05% tributyl phosphate defoamer, and the balance is water.

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Abstract

The invention provides a self-supporting high-bonding prestressed tunnel pressure slurry and a preparation method thereof. The self-supporting high-bonding prestressed tunnel pressure slurry comprises chlorite powder with pozzolanic activity, porous pozzolan, vermiculite powder, MIM stainless steel powder with good corrosion resistance and durability, thickener, defoamer, water reducer, and water are mixed and stirred. The prestressed tunnel pressure slurry made of the above raw materials not only has self-maintenance function, high early strength, high bonding force with steel bars and tunnel walls, but also volume stability, corrosion resistance of steel bars and durability of the entire concrete structure. substantial improvement.

Description

technical field [0001] The invention belongs to the field of civil engineering construction, and relates to a tunnel press slurry, in particular to a self-supporting high-bonding prestressed tunnel press slurry and a preparation method thereof. Background technique [0002] With the vigorous development of my country's infrastructure construction industry, post-tensioned prestressed concrete beams have been widely used in road and railway construction. As one of the key materials of prestressed concrete beams, channel grouting material can protect prestressed tendons from being exposed and corroded; it can effectively connect concrete and steel bars, ensure force transmission, and relieve fatigue damage of prestressed tendons and anchors ; It is of great significance to the safety and durability of concrete structures. Therefore, the quality of grouting materials is the key to ensure the quality of bridge construction. Because it is more and more widely used in engineering,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B20/02
CPCC04B20/023C04B28/04C04B2201/50C04B14/16C04B14/041C04B14/202C04B14/34C04B24/2623C04B22/06C04B2103/0068C04B24/2605C04B24/045
Inventor 何锐龙景潭陈华鑫谈亚文王振军王铜
Owner CHANGAN UNIV
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