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Method for laying electrochemistry desalting external anode through magnesium phosphate cement and carbon fiber sheet

A technology of magnesium phosphate cement and carbon fiber cloth, which is applied in the field of electrochemical desalination of reinforced concrete structures, can solve problems such as blocking chloride ions and reducing the effect of desalination, and achieves the effects of prolonging service life, reducing material costs, and wide application

Active Publication Date: 2016-01-13
BEIJING UNIV OF TECH +1
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Problems solved by technology

In the test, it was also found that adding fly ash to magnesium phosphate cement improved its resistance to chloride ion penetration, hindered the process of chloride ion migration and discharge to the anode, and reduced the effect of desalination. Therefore, it must not be used when preparing magnesium phosphate cement. Add fly ash

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  • Method for laying electrochemistry desalting external anode through magnesium phosphate cement and carbon fiber sheet
  • Method for laying electrochemistry desalting external anode through magnesium phosphate cement and carbon fiber sheet

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[0038] The size of the reinforced concrete (mortar) specimen used in the test is 300mm×300mm×120mm, and the mix ratio is water: cement: sand = 0.5:1:3, where Cl - It is directly mixed and added during molding, and the dosage of sodium chloride is 4% of the cement mass. The steel bars are smooth round steel bars of Φ8mm×320mm, and the rust on the surface of the steel bars is removed by grinding with sandpaper, and 4 bars are buried in each test piece. Distilled water and calcium hydroxide are used when preparing saturated lime water as an electrolyte solution. The material ratio of magnesium phosphate cement used in the preparation of each test piece is shown in Table 1. After the specimen is cured to 28d age under standard conditions ((20±2)℃, relative humidity 95%), connect the copper wires pre-embedded at the carbon fiber cloth of the specimen and the smooth round steel bars to the positive and negative terminals of the DC stabilized power supply respectively. The poles ar...

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Abstract

The invention relates to a method for laying an electrochemistry desalting external anode through magnesium phosphate cement and a carbon fiber sheet, and belongs to the technical field of reinforced concrete structure electrochemistry desalting. The magnesium phosphate cement is prepared from magnesia, phosphate, retarder, water and electric conduction materials according to a certain proportion; the surface of concrete to be desalted is polished to be flat and evenly coated with the magnesium phosphate cement, the thickness is 2 mm-3 mm, and the magnesium phosphate cement is smoothed; the carbon fiber sheet is attached to the surface of the magnesium phosphate cement and rolled in the fiber direction through a roller, bubbles are extruded out, and therefore the carbon fiber sheet is tightly attached to the working surface; after the magnesium phosphate cement is hardened, a copper wide adheres to the surface of the carbon fiber sheet to be connected with a positive pole of an external direct-current power source for a desalting test. The method for preparing the electrochemistry desalting external anode has the advantages that the material cost is low, laying is easy, convenient and rapid, the desalting effect is good, and the application range is wide, and has good application and popularization prospects.

Description

technical field [0001] The invention belongs to the technical field of electrochemical desalination of reinforced concrete structures, and in particular relates to a method for laying an external anode for electrochemical desalination by applying magnesium phosphate cement and carbon fiber cloth. At present, metal mesh such as ordinary steel wire mesh, stainless steel mesh or titanium mesh is generally used as the anode for electrochemical desalination. The invention proposes a new method of using carbon fiber cloth instead of metal mesh and magnesium phosphate cement as the carbon fiber cloth-concrete binder. Carbon fiber cloth is a kind of electrode material with good electrical conductivity, so that electrochemical desalination is not limited by the shape and size of components, and meets the engineering requirements of electrochemical desalination. However, at present, the binder for bonding carbon fiber cloth and concrete is mainly epoxy Resin glue does not have electric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/00
Inventor 李悦何赫刘雄飞陈晓寒耿春雷杨飞华
Owner BEIJING UNIV OF TECH
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