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Repair method of reinforced concrete cracks

A reinforced concrete and concrete technology, applied in the field of concrete, can solve the problems of shortened service life, poor integrity, high cost, etc., and achieve the effect of improving the compactness

Inactive Publication Date: 2015-01-07
NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Overall deterioration;
[0006] 2. Severely reduced carrying capacity;
[0007] 3. Severe loss of anti-penetration ability;
[0008] 4. Severely corroded steel bars;
[0009] 5. Difficult and expensive to repair;
[0010] 6. The service life is greatly shortened

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] An adjustable electroosmosis meter is installed at the concrete crack, and the sodium aluminosilicate solution concentration of 5% is mixed with 400 mesh zeolite powder until the sodium aluminosilicate solution is saturated in the zeolite powder; the aluminosilicate in the zeolite powder as a carrier is Sodium solution at a current density of 3A / M 2 Under the action of current, it penetrates into the surface of the steel bar through the concrete cracks and the concrete body, replaces the rust candle ions of the steel bar and passivates the surface of the steel bar for 48 hours; A / M 2 , here 4.5A / M 2 After 48 hours, change the current density from 3A / M 2 Adjust to 4.5A / M 2 ) The zeolite in it reacts with the sodium aluminosilicate solution and deposits in the cracks, so that the concrete cracks are closed and the concrete density is improved. The water permeability coefficient is used to indicate the degree of concrete compaction, and the water permeability coefficie...

Embodiment 2

[0027] An adjustable electroosmosis meter is installed at the concrete crack, and the concentration of sodium aluminosilicate solution is 2% mixed with 400 mesh zeolite powder until the sodium aluminosilicate solution is saturated in the zeolite powder; the sodium aluminosilicate solution in the zeolite powder carrier is At a current density of 1.0A / M 2 Under the action of current, the concrete cracks and the concrete body penetrate into the surface of the steel bar to replace the rust ions of the steel bar and passivate the surface of the steel bar for 48 hours; then the zeolite powder saturated with sodium aluminosilicate solution is under the action of an electric current (the current density must be kept at 4.5A / M 2 ) The zeolite interacts with the sodium aluminosilicate solution and deposits in the cracks, thereby closing the cracks in the concrete and improving the compactness of the concrete. The water permeability coefficient is used to indicate the compactness of co...

Embodiment 3

[0029] An adjustable electroosmosis meter is installed at the concrete crack, and the sodium aluminosilicate solution concentration of 10% is mixed with 400 mesh zeolite powder until the sodium aluminosilicate solution is saturated in the zeolite powder; the sodium aluminosilicate solution in the zeolite powder carrier is At a current density of 4.5A / M 2 Under the action of current, the concrete cracks and the concrete body penetrate into the surface of the steel bar to replace the rust ions of the steel bar and passivate the surface of the steel bar for 48 hours; then the zeolite powder saturated with sodium aluminosilicate solution is under the action of an electric current (the current density must be kept at 4.5A / M 2 ) The zeolite interacts with the sodium aluminosilicate solution and deposits in the cracks, thereby closing the cracks in the concrete and improving the compactness of the concrete. The water permeability coefficient is used to indicate the degree of concre...

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PUM

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Abstract

The invention provides a repair method of reinforced concrete cracks utilizing an electroosmosis method, wherein the method comprises the following steps: (1) firstly, arranging an electric permeameter at a reinforced concrete crack, mixing reinforcing steel bar protection solution, namely, sodium silicoaluminate solution with 300-450 meshes zeolite powder until the zeolite powder is saturated, putting the mixture in the electric permeameter, and the mass concentration of the sodium silicoaluminate solution is 2-10%; (2) starting the electric permeameter, controlling the current density of the electric permeameter to 0.5-4.5 A / M<2>, and the protection ions in the sodium silicoaluminate solution exchange with the reinforcing steel bar rust ions under the current action to passivate the surface of the reinforcing steel bar; and (3) the saturated zeolite powder and the sodium silicoaluminate solution deposit in the reinforced concrete crack under the current action to blank the crack so as to improve the density of the concrete. The repair method provided by the invention has the advantages of effectively overcoming the concrete air shrinkage and crack problems.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to a method for repairing cracks in reinforced concrete. Background technique [0002] Cement concrete is one of the largest and most widely used building materials in the world, such as reinforced concrete bridges, which are currently an important structural form of bridges. At present, my country's annual concrete output has reached 1 billion m 3 , increased by more than 2 times compared with 1995. By 2010, cement production had increased to 800-850 million tons, almost doubled from 490 million tons in 1996, and more than one-third of the world's total cement production. [0003] However, cement concrete materials have some defects, such as heavy weight, low tensile strength, and easy shrinkage cracking (including plastic shrinkage cracking, hardening drying shrinkage cracking), etc. These defects limit its wider use in structural engineering. Among them, the defect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04G23/02
Inventor 孙家瑛顾昕王藐民张敏杰余楠
Owner NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG