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Cement-based concrete reinforcing bar antirust paint, preparation method and application thereof

A concrete reinforcement and cement-based technology, applied in cement coatings, anti-corrosion coatings, coatings, etc., can solve problems such as unsatisfactory anti-rust effects, and achieve the effect of large-scale construction, cheap raw materials, and excellent anti-rust performance

Active Publication Date: 2015-11-04
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual application, it was found that the antirust effect of the coating was not ideal.

Method used

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  • Cement-based concrete reinforcing bar antirust paint, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1 A cement-based coating for rust prevention of concrete reinforcement

[0044] The raw material composition is:

[0045] 1kg (100%) of ordinary Portland cement with strength grade 52.5, 20g (2%) of RI steel rust inhibitor, 200g (20%) of ethylene-vinyl acetate copolymer, 9g (0.9%) of naphthalene-based powder water reducer, Sodium lignosulfonate 2g (0.2%), water 550g (55%).

[0046] Prepared by:

[0047] I. Prepare the above-mentioned various raw materials according to the formula;

[0048] II. Turn on the automatic mode of the mixer, add naphthalene-based powder water reducer and water, and stir for 2 minutes to fully mix the naphthalene-based powder water-reducer and water;

[0049] III. Add ethylene-vinyl acetate copolymer to the mixer, and continue to stir automatically for 2 minutes to obtain a uniform emulsion;

[0050] IV. Add cement and RI steel rust inhibitor to the emulsion obtained in step III, add sodium lignosulfonate after automatic stirring for ...

Embodiment 2

[0051] Example 2 A cement-based coating for rust prevention of concrete reinforcement

[0052] The raw material composition is:

[0053] Ordinary Portland cement of strength grade 52.5 1kg (100%), RI steel rust inhibitor 20g (2%), ethylene-vinyl acetate copolymer 150g (15%), naphthalene-based powder water reducer 10g (1%), Sodium lignosulfonate 2g (0.2%), water 500g (50%).

[0054] Preparation method: the same operation and steps as described in Example 1.

Embodiment 3

[0055] Example 3 A cement-based coating for rust prevention of concrete reinforcement

[0056] The raw material composition is:

[0057] Ordinary Portland cement of strength grade 52.5 1kg (100%), RI steel bar rust inhibitor 20g (2%), ethylene-vinyl acetate copolymer 136g (13.6%), naphthalene-based powder water reducer 10g (1%), Sodium lignosulfonate 1.8g (0.18%), water 467g (46.7%).

[0058] Preparation method: the same operation and steps as described in Example 1.

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Abstract

The invention provides a cement-base paint for concrete reinforcing bar rust prevention. The cement-base paint is composed of the following components by weight percentage on the basis of the cement mass: 100% of cement, 2-3% of a rust inhibitor, 0.5-1% of a levelling agent, 0-0.2% of a retarder, 10-25% of an ethylene-vinyl acetate copolymer and 40-60% of water. The invention also provides a preparation method and application of the cement-base paint. The cement-base paint provided by the invention has superior comprehensive performance, in the aspect of rust prevention, reinforcing bars can be rustless after immersion in salt water for 3 months, and in the aspect of reinforcing bar bond stress, the cement-base paint does not reduce the reinforcing bar bond stress, but enhances the reinforcing bar bond stress.

Description

technical field [0001] The invention belongs to the field of antirust of buildings and metals, and in particular relates to a cement-based coating for antirust of concrete steel bars, a preparation method and application thereof. Background technique [0002] Reinforced concrete has always played the most important role in the construction industry because of its excellent mechanical properties. However, during the service period of reinforced concrete, if the steel bars in the concrete are corroded, the strength and durability of the concrete will be seriously affected. The reason is that the steel bar corrosion has the following three hazards: 1. Reduce the bearing capacity of the structure and reduce the safety reserve; 2. Reduce the stiffness of the structure, increase the deformation, and even peel off the concrete protective layer, affecting normal use; 3. Reduce the ductility of the structure, or even change its shape, leading to engineering accidents. Therefore, ste...

Claims

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Application Information

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IPC IPC(8): C09D1/08C09D7/12C09D5/08
Inventor 焦宝祥柳嘉伟周启兆阎晓波徐凤广代少俊
Owner YANCHENG INST OF TECH
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