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Bridge prestressed duct grouting material and preparation method thereof

A tunnel grouting and prestressing technology, applied in the field of prestressed construction, can solve the problems of prolonging the corrosion rate of steel strands and unable to completely prevent the contact of steel strands

Inactive Publication Date: 2019-06-25
GUIZHOU TRANSPORTATION PLANNING SURVEY & DESIGN ACADEME
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, painting the coating on the surface can only prolong the corrosion rate of the steel strands, and circulating grouting can only ensure that there are no large holes in the concrete, but the actual concrete structure is a microporous structure, which cannot completely prevent the steel strands from interacting with water and air. s contact

Method used

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  • Bridge prestressed duct grouting material and preparation method thereof
  • Bridge prestressed duct grouting material and preparation method thereof
  • Bridge prestressed duct grouting material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: A bridge prestressed channel grouting material: it is composed of component A, cement, water, micro-expansion agent, and water reducer in mass ratio. Its preparation step is divided into two parts, and its one step is the preparation of component A, and its preparation step is:

[0029] a. Mix 15kg of AMP-95 buffer solution with 30kg of water, stir quickly until uniform, and blow nitrogen for 20-30min;

[0030] b. On the basis of step a, add 5kg sodium polymethacrylate and 6kg amino-modified celery paddle, heat to 75°C, and stir at 75°C for 15-20min;

[0031] c. On the basis of step b, add 7kg of nano-silica, 8kg of superfine iron oxide red, heat to 85°C, stir at 85°C for 15-20min, then add 4kg of chloroether resin, 7kg of acrylate, and stir until uniform, keep warm for 30-60min;

[0032] d. Add ammonia water to adjust the pH value to 7-8 to obtain component A;

[0033] The second step is the production of bridge prestressed channel grouting material. I...

Embodiment 2

[0034] Embodiment 2: A bridge prestressed channel grouting material: it is composed of component A, cement, water, micro-expansion agent, and water reducer in mass ratio. Its preparation step is divided into two parts, and its one step is the preparation of component A, and its preparation step is:

[0035] a. Mix 20kg of AMP-95 buffer solution with 40kg of water, stir quickly until uniform, and blow nitrogen for 20-30min;

[0036] b. On the basis of step a, add 8kg sodium polymethacrylate and 10kg amino-modified celery paddle, heat to 75°C, and stir at 75°C for 15-20min;

[0037] c. On the basis of step b, add 10kg of nano-silica, 12kg of superfine iron oxide red, heat to 85°C, stir at 85°C for 15-20min, then add 7kg of chloroether resin, 13kg of acrylate, and stir until uniform, keep warm for 30-60min;

[0038] d. Add ammonia water to adjust the pH value to 7-8 to obtain component A;

[0039] The second step is the production of bridge prestressed channel grouting materia...

Embodiment 3

[0040] Embodiment 3: A bridge prestressed channel grouting material: it is composed of component A, cement, water, micro-expansion agent, and water reducer in mass ratio. Its preparation step is divided into two parts, and its one step is the preparation of component A, and its preparation step is:

[0041] a. Mix 17.5kg of AMP-95 buffer solution with 35kg of water, stir quickly until uniform, and blow nitrogen for 20-30min;

[0042] b. On the basis of step a, add 6.5kg sodium polymethacrylate and 8kg amino-modified celery paddle, heat to 75°C, and stir at 75°C for 15-20min;

[0043] c. On the basis of step b, add 8.5kg of nano-silica, 10kg of superfine iron oxide red, heat to 85°C, stir at 85°C for 15-20min, then add 6.5kg of chloroether resin, 10kg of acrylate , stir until uniform, keep warm for 30-60min;

[0044] d. Add ammonia water to adjust the pH value to 7-8 to obtain component A;

[0045] The second step is the production of bridge prestressed channel grouting mate...

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Abstract

The invention discloses a bridge prestressed duct grouting material. The bridge prestressed duct grouting material is prepared by blending a component A, cement, water and a micro-expansion water reducer by mass ratio, the mass ratio of the component A to the cement to the water to the micro-expansion water reducer is (0.2 to 0.3):1:(0.33 to 0.45):(0.07 to 0.13), the component A is prepared fromthe following raw materials in parts by mass: 30-40 parts of water, 15-20 parts of an AMP-95 buffer solution, 7-13 parts of acrylate, 8-12 parts of superfine iron oxide red, 7-10 parts of nano-silica,6-10 parts of a stabilizer, 5-8 parts of an initiator, 4-7 parts of a copolymer of vinyl chloride and vinyl isobutyl ether, and ammonium hydroxide. According to the bridge prestressed duct grouting material, the degree of density is increased, the bridge prestressed duct grouting material can react first with the water and oxygen ions and chloride ions in the air, the contact of steel strands andoxidation factors can be effectively avoided, the rusting rate of the steel strands is delayed, and the durability, reliability and safety of prestressed concrete structures are ensured.

Description

technical field [0001] The invention relates to a bridge prestressed channel grouting material and a preparation method thereof, belonging to the technical field of prestressed construction. Background technique [0002] Due to the advantages of prestressed concrete structures such as high rigidity, good fatigue resistance, light weight of components, and small cross-sectional size, prestressed concrete structures have been widely used in recent years. The steel strand is the key load-bearing component in the prestressed concrete structure, and its anticorrosion is related to the durability and safety of the structure. In recent years, many projects have been damaged due to corrosion of steel strands, resulting in their actual service life being far lower than the design life, which has brought adverse social impacts and major economic losses. [0003] Corrosion of prestressed steel strands is mostly due to the loose or loose seal of the anchorage end, and insufficient grou...

Claims

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Application Information

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IPC IPC(8): C04B28/04
Inventor 向楠江洲曾宗平陈竹王大林黄星瑞徐治华刘伟伟张国发
Owner GUIZHOU TRANSPORTATION PLANNING SURVEY & DESIGN ACADEME
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