阅读说明：本技术 一种混凝土结构裂缝修复用电沉积液及其使用方法 (Electrodeposition liquid for repairing concrete structure crack and application method thereof ) 是由 储洪强 左清媛 张迎忠 郭明志 朱正宇 蒋林华 赵素晶 于 2020-03-27 设计创作，主要内容包括：本发明公开了一种混凝土结构裂缝修复用电沉积液及其使用方法,该电沉积液包括锌盐水溶液和镁盐水溶液中的一种、表面活性剂和有机分子；该电沉积液的使用方法包括以下步骤：(S1)制备电沉积液；(S2)将混凝土试件中的钢筋用导线连接在电源负极上,电源正极连接在金属网上；(S3)将金属网放置在电解槽底部,混凝土试件放置在金属网上部,并利用绝缘垫块将混凝土试件和金属网隔开；(S4)将电沉积液倒入电解槽；(S5)开启电源施加电流；(S6)每隔4～6天更换电沉积液保持电沉积液的浓度,18～24天后,取出混凝土试件。该电沉积液能够提高混凝土结构裂缝修复效果以及混凝土结构的渗透性能；提高沉积物与混凝土结构之间的粘结强度,使用方法简单、成本低。(The invention discloses an electrodeposition liquid for repairing concrete structure cracks and a using method thereof, wherein the electrodeposition liquid comprises one of a zinc salt aqueous solution and a magnesium salt aqueous solution, a surfactant and organic molecules; the using method of the electrodeposition solution comprises the following steps: (S1) preparing an electrodeposition bath; (S2) connecting the steel bars in the concrete sample to the negative pole of a power supply by a lead, and connecting the positive pole of the power supply to the metal net; (S3) placing a metal net at the bottom of the electrolytic bath, placing a concrete sample on the upper part of the metal net, and separating the concrete sample from the metal net by using an insulating cushion block; (S4) pouring the electrodeposition bath into an electrolytic bath; (S5) turning on the power applying current; (S6) replacing the electrodeposition liquid every 4-6 days to keep the concentration of the electrodeposition liquid, and taking out the concrete sample after 18-24 days. The electrodeposition liquid can improve the repairing effect of concrete structure cracks and the permeability of the concrete structure; the bonding strength between the sediment and the concrete structure is improved, the use method is simple, and the cost is low.)

1. The electrodeposition liquid for repairing the crack of the concrete structure is characterized by comprising one of a zinc salt aqueous solution and a magnesium salt aqueous solution, a surfactant and organic molecules.

2. The electrodeposition solution for repairing cracks in a concrete structure according to claim 1, wherein the concentrations of the aqueous solution of zinc salt and the aqueous solution of magnesium salt are 0.05 to 0.20 mol/L.

3. The electrodeposition liquid for repairing cracks in a concrete structure according to claim 1 or 2, wherein the aqueous solution of zinc salt and the aqueous solution of magnesium salt are ZnSO, respectively₄Aqueous solution and MgSO₄An aqueous solution.

4. The electrodeposition liquid for repairing cracks in a concrete structure according to claim 1, wherein the surfactant comprises 1.0 to 1.5% by volume of polyvinylpyrrolidone and 0.5 to 1.5% by volume of cetyltrimethylammonium bromide.

5. The electrodeposition liquid for repairing a crack of a concrete structure according to claim 1, wherein the surfactant comprises 1.0 to 1.5% by volume of polyvinylpyrrolidone and 1.0 to 1.5% by volume of sodium dodecylbenzene sulfate.

6. The electrodeposition liquid for repairing a crack of a concrete structure according to claim 1, further comprising an organic molecule.

7. The electrodeposition liquid for repairing a crack of a concrete structure according to claim 6, wherein the organic molecule is 0.1 to 0.15% by volume of phthalic acid.

8. The method for using the electrodeposition liquid for repairing a crack of a concrete structure according to claim 1, comprising the steps of:

(S1) preparing an electrodeposition solution (1);

(S2) connecting the steel bars (4) in the concrete test piece (2) to the negative pole of the power supply (6) by a lead, and connecting the positive pole of the power supply (6) to the metal net;

(S3) placing a metal net at the bottom of the electrolytic bath, then placing the concrete test piece (2) on the upper part of the metal net (5), and separating the concrete test piece (2) from the metal net by using an insulating cushion block (3);

(S4) pouring the electrodeposition solution (1) into an electrolytic bath until the electrodeposition solution is submerged on the upper surface of the concrete test piece (2);

(S5) turning on the power supply (6) to apply current;

(S6) replacing the electrodeposition liquid (1) every 4-6 days to keep the concentration of the electrodeposition liquid (1), and taking out the concrete test piece (2) after 18-24 days.

9. The method for using the electrodeposition liquid for repairing concrete structure cracks according to claim 8, wherein the metal mesh is a sheet-like titanium mesh (5) having a purity of 98 to 99.9%.

10. The method of claim 8, wherein the current density of the power source (6) in step S5 is 1.0-2.0A/m²。

Technical Field

The invention relates to an electrodeposition liquid and a using method thereof, in particular to an electrodeposition liquid for repairing a crack of a concrete structure and a using method thereof.

Background

As one of the most widely used modern civil engineering building materials, the concrete has the advantages of economy, good plasticity, designable performance, strong durability and the like, is widely used in a series of projects such as houses, bridges, roads, water conservancy, water transportation and the like, and plays a role that other materials cannot replace. However, because the concrete is affected by environmental factors in the service process, diseases such as cracks, corrosion, local damage and the like are easily generated, so that the normal use of the concrete structure is affected, even disastrous events can be generated, and great loss is brought to national economy and life safety of people. The electrodeposition method can repair cracks of concrete structures and is particularly suitable for water environment engineering which is difficult to work in the traditional technology, but the electrodeposition liquid used in the existing electrodeposition method for repairing concrete cracks is pure zinc salt or magnesium salt aqueous solution, the phenomenon of agglomeration of the sediments is serious, the compactness is poor, the bonding strength between the sediments and a concrete matrix is too low, the impermeability of a test piece is not obviously improved, and the crack repairing effect is poor.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to provide the electrodeposition liquid for repairing the concrete structure crack, which has the advantages of high deposition speed, no sediment agglomeration phenomenon, high deposition density and good crack repairing effect.

The technical scheme is as follows: the invention relates to an electrodeposition liquid for repairing concrete structure cracks, which comprises one of a zinc salt aqueous solution and a magnesium salt aqueous solution, a surfactant and organic molecules.

Wherein the concentrations of the zinc salt aqueous solution and the magnesium salt aqueous solution are 0.05-0.20 mol/L;the zinc salt aqueous solution and the magnesium salt aqueous solution are ZnSO respectively₄Aqueous solution and MgSO₄An aqueous solution; the surfactant comprises 1.0-1.5% of polyvinylpyrrolidone and 0.5-1.5% of hexadecyl trimethyl ammonium bromide by volume fraction; the surfactant comprises 1.0-1.5% of polyvinylpyrrolidone and 1.0-1.5% of sodium dodecyl benzene sulfate by volume fraction; the composite surfactant further comprises organic molecules, wherein the volume fraction of the organic molecules is 0.1-0.15% of phthalic acid, and the organic molecules can change the stacking property of the composite surfactant, so that newly generated sediments are more compact and are more tightly combined with concrete.

The application method of the electrodeposition liquid for repairing the concrete structure crack comprises the following steps:

(S1) preparing an electrodeposition bath;

(S2) connecting the steel bars in the concrete sample to the negative pole of a power supply by a lead, and connecting the positive pole of the power supply to the metal net;

(S3) placing a metal net at the bottom of the electrolytic bath, then placing a concrete sample on the upper part of the metal net, and separating the concrete sample from the metal net by using an insulating cushion block;

(S4) pouring the electrodeposition solution into the electrolytic bath until the electrodeposition solution is submerged on the upper surface of the concrete sample;

(S5) turning on the power applying current;

(S6) replacing the electrodeposition liquid every 4-6 days to keep the concentration of the electrodeposition liquid, and taking out the concrete sample after 18-24 days.

Wherein the metal mesh is a sheet titanium mesh with the purity of 98-99.9%, and in the step S5, the current density of the power supply (6) is 1.0-2.0A/m²。

Compared with the prior art, the invention has the following remarkable advantages: 1. the phenomenon of sediment agglomeration is avoided, the repairing effect of the concrete structure crack is improved, and the filling depth of the crack can be improved by 30 mm; 2. the anti-permeability performance of the concrete structure is improved, the permeability coefficient is reduced by 75.3% at the crack position and reduced by 87.3% at the non-crack position; 3. the bonding strength between the sediment and the concrete structure is improved by 102.7 percent; 3. the use method is simple and the cost is low.

Drawings

FIG. 1 is a schematic view of an apparatus for use with the present invention;

FIG. 2 is a scanning electron microscope image of the deposit in the crack after repair of the test piece according to the invention;

FIG. 3 is a scanning electron microscope image of the deposit in the crack after repair of the comparative example specimen.

Detailed Description