Unlock instant, AI-driven research and patent intelligence for your innovation.

Anti-corrosion and anti-rust type prestressed tunnel pressure slurry

A technology for grouting and prestressing of ducts, applied in the field of building materials, can solve problems such as insufficient grouting, failure of structural bearing capacity, and reduced performance of prestressed tendons.

Active Publication Date: 2016-02-03
SHAANXI TONGYU NEW MATERIALS CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, many construction units use ordinary cement to mix expansion agent and water reducing agent in the prestressed channel grouting, and add a large amount of mixing water to mix evenly before grouting. Using this method of grouting will often cause the following adverse phenomena, such as: Insufficient grout, poor binding force with prestressed tendons, bleeding, the water used contains corrosive chloride ions or sulfate ions, which will cause corrosion of prestressed tendons, etc. It will lead to a decrease in the performance of the prestressed tendons, thereby affecting the safety and durability of the structure
When the prestressed tendons are corroded to a certain extent, the prestress will fail, resulting in partial or complete failure of the structural bearing capacity. This hazard is especially fatal in long-span bridge structures where the prestress system plays a major role in the structural bearing capacity, because it often It may cause unforeseen damage to the bridge structure during operation, and cause heavy losses to the safety of people's lives and properties

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Anti-corrosion and anti-rust type prestressed tunnel pressure slurry
  • Anti-corrosion and anti-rust type prestressed tunnel pressure slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Weigh raw materials according to the following parts by mass: 900 parts of P052.5 grade Portland cement, 10 parts of superplasticizer, 20 parts of AEA expansion agent, 1 part of tartaric acid, 1 part of ultrafine kaolin, 30 parts of ultrafine quartz powder, 20 parts of superfine fly ash, 0.1 part of defoamer, 0.1 part of air-entraining agent, 20 parts of preservative, and then stir evenly.

[0038] The grouting material prepared in this example was added to 0.26-0.28% water, and stirred evenly to prepare a grouting material, which was used for post-tensioning prestressed channel grouting construction, and its properties are shown in Table 1.

example 2

[0040] Weigh raw materials according to the following parts by mass: 840 parts of P042.5R Portland cement, 12 parts of superplasticizer, 1.5 parts of molasses, 1 part of sodium polyacrylate, 1.4 parts of superfine kaolin, 40 parts of superfine slag powder, weight 60 parts of calcium, 65 parts of UEA expansion agent, 0.2 part of defoamer, 0.2 part of air-entraining agent, 30 parts of preservative, and then stir evenly.

[0041] The grouting material prepared in this example was added to 0.26-0.28 water, and stirred evenly to prepare a grouting material, which was used for post-tensioning prestressed channel grouting construction. The properties are shown in Table 1.

Embodiment 3

[0043] Weigh raw materials according to the following parts by mass: 700 parts of P042.5 Portland cement, 15 parts of superplasticizer, 20 parts of UEA expansion agent, 2 parts of molasses, 2 parts of sodium polyacrylate, 2 parts of superfine kaolin, 50 parts of slag powder, 100 parts of heavy calcium, 85 parts of UEA expansion agent, 0.3 part of defoamer, 0.2 part of air-entraining agent, 50 parts of preservative, and then stir evenly.

[0044] The grouting material prepared in this example was added to 0.26-0.28 water, and stirred evenly to prepare a grouting material, which was used for post-tensioning prestressed channel grouting construction. The properties are shown in Table 1.

[0045] Each embodiment performance index table of table 1

[0046]

[0047]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
compressive strengthaaaaaaaaaa
compressive strengthaaaaaaaaaa
strengthaaaaaaaaaa
Login to View More

Abstract

The invention relates to a building material, and particularly relates to an anticorrosion rust-proof pre-stressed duct grouting material. According to the technical scheme of grouting material, the grouting material is prepared by mixing water and following raw materials by weight : 700-900 parts of ordinary portland cement having a strength of 42.5 grades or higher or low-alkali cement having a strength of 42.5 grades or higher, 10-15 parts of an efficient water reducer, 20-85 parts of a micro-expanded component, 1-2 parts of a retarding component, 30-100 parts of a filling material and 20-50 parts of an anticorrosion rust-proof component. By adoption of the technical scheme, the grouting material has following beneficial effects: low water-binder ratio (0.26-0.28), good flowing property (an initial fluidity is lower than 17 s); zero bleeding rate, micro-expansibility, early strength and high strength, and good working performances.

Description

technical field [0001] The invention relates to building materials, in particular to an anti-corrosion and anti-rust type prestressed tunnel pressure slurry. Background technique [0002] In post-tensioned prestressed channels, prestressed tendons and channel grouting occupy a pivotal position, which is the key to whether the prestress can be correctly established and the design purpose can be achieved. [0003] At present, many construction units use ordinary cement to mix expansion agent and water reducing agent in the prestressed channel grouting, and add a large amount of mixing water to mix evenly before grouting. Using this method of grouting will often cause the following adverse phenomena, such as: Insufficient grout, poor binding force with prestressed tendons, bleeding, the water used contains corrosive chloride ions or sulfate ions, which will cause corrosion of prestressed tendons, etc. The performance of prestressed tendons will be reduced, which will affect th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B28/00C04B111/26C04B111/24
Inventor 李春轩曾有全马瑞杰张海宝
Owner SHAANXI TONGYU NEW MATERIALS CO LTD