Method for smearing lithium nitrite mortar on surface of reinforced concrete to resist rust

A technology of reinforced concrete and lithium nitrite, which is applied in the field of anti-corrosion application of lithium nitrite mortar on the surface of reinforced concrete, can solve problems such as slowness, and achieve the effect of easy penetration, simple and effective operation, and accelerated penetration speed

Inactive Publication Date: 2015-12-09
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the slowness of natural penetration of nitrite in concrete, its application as a penetrating rust inhibitor on the surface of reinforced concrete structures is less

Method used

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  • Method for smearing lithium nitrite mortar on surface of reinforced concrete to resist rust
  • Method for smearing lithium nitrite mortar on surface of reinforced concrete to resist rust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment one: Lithium nitrite mortar smears antirust method on reinforced concrete surface, comprises following specific steps:

[0019] (1) Test the reinforced concrete structure with a steel corrosion tester to find out the rusted parts;

[0020] (2) Use a grinder to grind off the concrete structure of the rusted part by 5mm;

[0021] (3) Deploying lithium nitrite into a saturated aqueous solution of lithium nitrite;

[0022] (4) Moisten the polished surface with a saturated aqueous solution of lithium nitrite to form a water film on the polished surface;

[0023] (5) Evenly mix lithium nitrite with mortar to prepare lithium nitrite mortar, wherein the mass ratio of lithium nitrite to cement in the mortar is 2.5:100;

[0024] (6) Apply the lithium nitrite mortar on the grinding surface until it is level with the surrounding concrete structure. After the final setting and hardening of the lithium nitrite mortar, water it for curing at room temperature.

Embodiment 2

[0025] Embodiment two: Lithium nitrite mortar smears anti-corrosion method on reinforced concrete surface, comprises the following specific steps:

[0026] (1) Test the reinforced concrete structure with a steel corrosion tester to find out the rusted parts;

[0027] (2) Use a grinder to grind off the concrete structure of the rusted part by 10mm;

[0028] (3) Deploying lithium nitrite into a saturated aqueous solution of lithium nitrite;

[0029] (4) Moisten the polished surface with a saturated aqueous solution of lithium nitrite to form a water film on the polished surface;

[0030] (5) Evenly mix lithium nitrite with mortar to prepare lithium nitrite mortar, wherein the mass ratio of lithium nitrite to cement in the mortar is 2:100;

[0031] (6) Apply the lithium nitrite mortar on the grinding surface until it is level with the surrounding concrete structure. After the final setting and hardening of the lithium nitrite mortar, water it for curing at room temperature.

Embodiment 3

[0032] Embodiment three: Lithium nitrite mortar is coated with antirust method on reinforced concrete surface, comprises the following specific steps:

[0033] (1) Test the reinforced concrete structure with a steel corrosion tester to find out the rusted parts;

[0034] (2) Use a grinder to grind off the concrete structure of the rusted part by 8mm;

[0035] (3) Deploying lithium nitrite into a saturated aqueous solution of lithium nitrite;

[0036] (4) Moisten the polished surface with a saturated aqueous solution of lithium nitrite to form a water film on the polished surface;

[0037] (5) Evenly mix lithium nitrite with mortar to prepare lithium nitrite mortar, wherein the mass ratio of lithium nitrite to cement in the mortar is 2.2:100;

[0038] (6) Apply the lithium nitrite mortar on the grinding surface until it is level with the surrounding concrete structure. After the final setting and hardening of the lithium nitrite mortar, water it for curing at room temperature...

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Abstract

The invention discloses a method for smearing lithium nitrite mortar on the surface of reinforced concrete to resist rust. The method is characterized by comprising: firstly finding out a rusty part; polishing a concrete structure of the rusty part by 5-10 mm; then wetting a polishing face by using a lithium nitrite saturated aqueous solution, wherein a water film is formed on the polishing face; and finally, smearing the lithium nitrite mortar on the polishing face and after the lithium nitrite mortar is finally set and hardened, watering the concrete to maintain the concrete. The method has the advantages that the method is simple and convenient to operate and effective and can accelerate the seepage velocity of a lithium nitrite solution in the concrete, so that the lithium nitrite mortar is suitable for being used as a penetrating rust inhibitor which is smeared on the surface of the reinforced concrete structure. Moreover, according to the method, before smearing, 5-10 mm of the concrete structure in the rusty part is polished by using a polishing machine, so that space is provided for smearing the lithium nitrite mortar and the nitrite ions permeate into the concrete structure more easily, and the requirement on the depth of penetration of the nitrite ions is further reduced. The method is particularly suitable for repairing the concrete structure which is not suitable to be smeared by using the rust inhibitor solution as a crack is oversized if the concrete structure is cracked.

Description

technical field [0001] The invention relates to an antirust method for reinforced concrete structures in the construction field, in particular to an antirust method for applying lithium nitrite mortar on the surface of reinforced concrete. Background technique [0002] Nitrite, as a steel rust inhibitor in reinforced concrete structures, has a good corrosion inhibitory effect, and its antirust / rust prevention effect depends on the molar ratio of chloride ions to nitrite ions in concrete. The greater the chloride content, the NO required to inhibit steel corrosion 2 - / CI - The greater the molar ratio. my country's "Technical Specifications for the Application of Concrete Admixtures" stipulates: when the chlorine salt anti-rust concrete antifreeze agent is 0.5% to 1.5% of the cement weight, the ratio of sodium nitrite to chloride salt should be greater than 1; When the amount of chloride salt is 1.5% to 3% of the cement weight, the ratio of sodium nitrite to chloride salt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/08C04B103/61
Inventor 孙武柳俊哲贺智敏巴明芳
Owner NINGBO UNIV
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