Method for extracting chloride ions in concrete members

A technology of concrete and chloride ions, applied in building components, building insulation materials, etc., can solve the problems of late maintenance safety hazards, a lot of labor, low efficiency and so on

Inactive Publication Date: 2014-03-26
SHANGHAI FAHE BRIDGE & TUNNEL MAINTENANCE ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is impossible for workers to carefully and thoroughly treat corroded metal substrates with inefficient hand tools or dusty dry blasting equipment. The original treatment of similar substrates either takes a lot of time or requires a lot of labor, or cost more than expected
[0005] To sum up, there are many problems in the daily anti-corrosion process of metal structures in my country (

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A method for extracting chloride ions in concrete components, the method comprises the following steps:

[0058] (1) Use the FH-B2500 bridge and tunnel maintenance vehicle to groove the areas of concrete components with serious chloride ion content (>0.05mol / L);

[0059] (2) Insert the alkaline active zinc plate into the slot and connect it with the steel bar. The alkaline active zinc plate used is a commercially available Galvashield XP4 zinc plate;

[0060] (3) Use inorganic mortar to fill up the slots on the concrete components and restore the shape of the concrete components. Wherein, the inorganic mortar used is composed of the following components and parts by weight: water reducer polycarboxylate 0.8, hydroxypropyl 0.45 base methyl cellulose, 30 kaolin, 800 No. 5 silica sand with a diameter of 16-32 mm, 100 No. 7 silica sand with a diameter of 10-20 mesh, and 700 425 cement with a compressive strength of 32.5 MPa in 28 days.

Embodiment 2

[0062] A method for extracting chloride ions in concrete components, the method comprises the following steps:

[0063] (1) Drill holes for concrete components with average chloride ion content (<0.05mol / L);

[0064] (2) Insert the alkaline active zinc plate into the opening and connect it to the steel bar. The alkaline active zinc plate used is a commercially available Galvashield XP4 zinc plate;

[0065] (3) Utilize inorganic mortar to fill up the grooves on the concrete components and restore the shape structure of the concrete components, wherein the inorganic mortar used is composed of the following components and parts by weight: water reducer polycarboxylate 1, hydroxypropyl 0.6 base methyl cellulose, 40 kaolin, 1000 No. 5 silica sand with a diameter of 16-32 mm, 200 No. 7 silica sand with a diameter of 10-20 mesh, and 800 425 cement with a compressive strength of 32.5 MPa in 28 days.

Embodiment 3

[0067] A method for extracting chloride ions in concrete components, the method comprises the following steps:

[0068] (1) For concrete components used in seawater, directly bind the alkaline active zinc plate with the steel bar and then pour the concrete;

[0069] (3) It is enough to use inorganic mortar to carry out surface treatment on concrete components, wherein the inorganic mortar is composed of the following components and parts by weight: water reducer polycarboxylate 1.2, hydroxypropyl methylcellulose 0.85, kaolin 49, diameter 1200 for No. 5 silica sand with a diameter of 16-32mm, 300 for No. 7 silica sand with a diameter of 10-20 mesh, and 980 for 425 cement with a compressive strength of 32.5MPa in 28 days.

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Abstract

The invention relates to a method for extracting chloride ions in concrete members. The method comprises the following steps that grooves or holes are formed in the concrete members; alkaline active zinc boards are inserted into the grooves or the holes; the grooves or the holes in the concrete members are filled up and made even through inorganic mortar; and the appearance structure of the concrete members is recovered. Compared with the prior art, the method has the advantages that electrochemical repairing is carried out on the reinforced concrete structure, the chloride pollution is fundamentally prevented from corroding reinforcing steel bars in the concrete, the protective layers of a large amount of polluted concrete do not need to be removed, and therefore a large amount of time and labor and a large number of materials can be saved, and the economic and social benefits are good.

Description

technical field [0001] The invention relates to a method for curing concrete components, in particular to a method for extracting chloride ions in concrete components. Background technique [0002] Corrosion of metal materials refers to a destructive phenomenon caused by chemical and electrochemical interactions between metal materials and surrounding media. For metals, most of them exist in the form of metal compounds in nature. From a thermodynamic point of view, except for a few noble metals (such as gold, platinum, etc.), all metals have a tendency to transform into ions. Therefore, metal elements have higher free energy than their compounds, and there must be a tendency to spontaneously return to the thermodynamically more stable natural form-oxide, so metal corrosion is a spontaneous and ubiquitous phenomenon. inevitable. [0003] In recent years, the degradation of the service performance of concrete member structures due to the corrosion of steel bars, and the pre...

Claims

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Application Information

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IPC IPC(8): E04B1/64C04B28/00
Inventor 丁新勇
Owner SHANGHAI FAHE BRIDGE & TUNNEL MAINTENANCE ENG TECH
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