CN102560588B

CN102560588B - Solution for repairing concrete crack by electrochemical deposition method and preparation method thereof

Info

Publication number: CN102560588B
Application number: CN201110000701.1A
Authority: CN
Inventors: 储洪强; 王培铭; 潘伟
Original assignee: Tongji University
Current assignee: Tongji University
Priority date: 2011-01-04
Filing date: 2011-01-04
Publication date: 2014-11-19
Anticipated expiration: 2031-01-04
Also published as: CN102560588A

Abstract

The invention relates to a solution for repairing concrete crack by an electrochemical deposition method and a preparation method thereof. The solution is composed of the following components of: 0.05mol/L of a main liquid Zn(CH3COO)2 and 20-30% (volume percentage) of an additive anhydrous ethanol. The preparation method contains the following steps of: preparing 0.05mol/L of a Zn(CH3COO)2 solution, adding it into 20-30% (volume percentage) of anhydrous ethanol, stirring and uniformly mixing. By the adoption of the solution, corrosion of strong acid group anion to the concrete structure is avoided. Anhydrous ethanol is used as the additive so as to decrease hydrogen evolution reaction of electrodeposition. The generation of a certain amount of OH- ions is guaranteed and simultaneously ZnO is deposited to the maximum, thus increasing resistance of the electrolyte, reducing current density, promoting the growth of the electrodeposition layer, making the electrodeposition layer more compact and flat and raising endurance of the concrete structure.

Description

Be used for solution of repairing concrete crack by electrochemical deposition method and preparation method thereof

Technical field

The invention belongs to civil engineering material technical field, especially relate to a kind of solution for repairing concrete crack by electrochemical deposition method and preparation method thereof.

Background technology

Because cement concrete is a kind of fragility nonuniformity engineering materials, there is a large amount of microscopic checks and Bu Tong big or small hole in its inside, tensile strength is very low, and splitting resistance is very poor, so concrete structure is easy to produce crack, can say that distress in concrete is almost inevitable.The object of crack repairing is that structural member is recovered because of use function and weather resistance that cracking reduces, and method for repairing and mending and material are mainly determined according to factors such as the functional requirement of structure, Cracks, crack proterties, structure importance and envrionment conditionss.There is significant limitation to the reparation of distress in concrete in water surrounding in traditional distress in concrete recovery technique (structural strengthening method, surface preparation, injection process, completion method etc.), and for crack autogenous healing technology, crystalline deposit method is CaCO in the time that current are very fast ₃precipitation can be dissolved and be rinsed impact reparation, and penetrant crystalline method is to being greater than the crack autogenous healing poor effect of 0.4mm, and that polymer cure method also has some key issues to have is to be solved.

Electro-deposition method repairing concrete crack is the new technology occurring in recent years in the world, be specially adapted to be difficult to by conventional repair techniques the concrete structure proving effective or price is too high, both applicable to the reparation in prevention of marine concrete structures crack, can be used to again repair land distress in concrete.Put into electrolyzer by being with crannied concrete sample, in test specimen, imbed in advance reinforcing bar and draw wire, this wire is connected as negative electrode with the negative pole of power supply, sheet titanium mesh plate is put into bottom of electrolytic tank simultaneously, and be connected as anode with the positive pole of power supply, then inject solubility Zn ²⁺, Mg ²⁺salt electric depositing solution.Concrete sample, electric depositing solution, supporting electrode, wire, power supply just form a loop like this.In loop, apply faint low-voltage DC, in the time that electric current flows through solution, negative ions moves to the two poles of the earth respectively, and series reaction occurs simultaneously on electrode, last throw out is deposited on the crack of concrete sample with surperficial upper, thereby reaches the object of repairing crack.

As adopt ZnSO ₄, MgSO ₄, ZnCl ₂, MgCl ₂deng as electric depositing solution, strong acid radical ion is (as SO ₄ ^2-, Cl ^-deng) will produce corrosion to concrete structure, and select Mg ²⁺salt, the Mg (OH) of generation ₂, without bond, and cohesive strength between concrete substrate is lower.

Summary of the invention

Object of the present invention is exactly to provide a kind of finer and close, smooth solution for repairing concrete crack by electrochemical deposition method of burn into settled layer and preparation method thereof of avoiding producing in order to overcome the defect that above-mentioned prior art exists.

Object of the present invention can be achieved through the following technical solutions:

For the solution of repairing concrete crack by electrochemical deposition method, it is characterized in that, this solution is made up of main liquid and additive, the Zn (CH that wherein main liquid is 0.05mol/L ₃cOO) ₂solution, additive is dehydrated alcohol, 20v/v%～30v/v% that the add-on of additive is main liquid.

The preparation method who is used for the solution of repairing concrete crack by electrochemical deposition method, is characterized in that, the method comprises the following steps:

(1) compound concentration is 0.05mol/L Zn (CH ₃cOO) ₂solution;

(2) obtain adding dehydrated alcohol in solution to step (1) preparation, the add-on of dehydrated alcohol by volume percentage composition is counted 20%～30% of solution, is uniformly mixed and obtains product.

Compared with prior art, the present invention has the following advantages:

After concrete structure with crack adopts electrochemical deposition method to repair, in concrete surface, crack and inside configuration generate settling, oversite concrete surface, healing distress in concrete, fill concrete internal void, improve concrete pore structure, and the bonding force of settling and matrix can reach concrete tensile strength.These settlings not only provide physical protection layer for concrete, and stop to a certain extent objectionable impurities corrosion concrete, can effectively improve the weather resistance of concrete structure.This technology is applicable in water surrounding concrete structure and traditional recovery technique is difficult to the concrete structure proving effective or rehabilitation cost is too high.

As adopt ZnSO ₄, MgSO ₄, ZnCl ₂, MgCl ₂deng as electric depositing solution, strong acid radical ion is (as SO ₄ ^2-, Cl ^-deng) will produce corrosion to concrete structure, and select Mg ²⁺salt, the Mg (OH) of generation ₂, without bond, and cohesive strength between concrete substrate is lower, so adopt Zn (CH ₃cOO) ₂solution can avoid strong acid radical ion (as SO ₄ ^2-, Cl ^-deng) to concrete structure produce corrosion, adopt in addition dehydrated alcohol as additive, reduced to a greater degree the water yield as solvent, the evolving hydrogen reaction of galvanic deposit is weakened, ensure produce a certain amount of OH ^-when ion, farthest deposit ZnO, and the resistance of electrolytic solution is increased, play the effect that reduces current density, be conducive to the growth of deposition layer, make deposition layer finer and close, smooth, to the raising better effects if of concrete structure durability.

The electric depositing solution that electrochemical deposition method repairing concrete crack provided by the invention adopts has that repairing effect is good, cost is low, stable, easy to store, free from environmental pollution, compound method is easy, easily realization.

Embodiment

Below in conjunction with specific embodiment, the present invention is described in detail.

Embodiment 1

For the solution of repairing concrete crack by electrochemical deposition method, this solution is made up of main liquid and additive, the Zn (CH that wherein main liquid is 0.05mol/L ₃cOO) ₂solution, additive is dehydrated alcohol, the 20v/v% that the add-on of additive is main liquid comprises the following steps for the preparation method of the solution of repairing concrete crack by electrochemical deposition method:

(1) compound concentration is 0.05mol/L Zn (CH ₃cOO) ₂solution;

(2) obtain adding dehydrated alcohol in solution to step (1) preparation, the add-on of dehydrated alcohol by volume percentage composition is counted 20% of solution, is uniformly mixed and obtains product.

Embodiment 2

For the solution of repairing concrete crack by electrochemical deposition method, this solution is made up of main liquid and additive, the Zn (CH that wherein main liquid is 0.05mol/L ₃cOO) ₂solution, additive is dehydrated alcohol, the 25v/v% that the add-on of additive is main liquid comprises the following steps for the preparation method of the solution of repairing concrete crack by electrochemical deposition method:

(1) compound concentration is 0.05mol/L Zn (CH ₃cOO) ₂solution;

(2) obtain adding dehydrated alcohol in solution to step (1) preparation, the add-on of dehydrated alcohol by volume percentage composition is counted 25% of solution, is uniformly mixed and obtains product.

Embodiment 3

(1) compound concentration is 0.05mol/L Zn (CH ₃cOO) ₂solution;

(2) obtain adding dehydrated alcohol in solution to step (1) preparation, the add-on of dehydrated alcohol by volume percentage composition is counted 30% of solution, is uniformly mixed and obtains product.

Claims

1. for the solution of repairing concrete crack by electrochemical deposition method, it is characterized in that, this solution is made up of main liquid and additive, the Zn (CH that wherein main liquid is 0.05mol/L ₃cOO) ₂solution, additive is dehydrated alcohol, 20v/v%～30v/v% that the add-on of additive is main liquid.

2. the preparation method of the solution for repairing concrete crack by electrochemical deposition method as claimed in claim 1, is characterized in that, the method comprises the following steps:

(1) compound concentration is 0.05mol/L Zn (CH ₃cOO) ₂solution;