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High peeling resistance concrete surface protective coating and construction method thereof

A technology for concrete surface and protective coating, applied in hydraulic engineering, marine engineering, construction, etc., can solve the problems of being easily damaged by ice pulling force, coating bubbling, not resistant to water erosion, etc., and achieve the effect of suitable mechanical properties

Pending Publication Date: 2019-04-05
HANGZHOU GUODIAN DAM SAFETY ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bonding effect between the organic polymer coating and concrete is the key to achieve long-term effective protection of the coating. It is usually tested by positive tensile test. It is found in the application that even the coating with positive tensile bonding strength above 3MPa can still It is peeled off, which is usually caused by insufficient or excessive elastic deformation capacity of the coating structure. Such coatings are prone to bubbles, are not resistant to water erosion, and are easily damaged by ice pulling forces.

Method used

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  • High peeling resistance concrete surface protective coating and construction method thereof
  • High peeling resistance concrete surface protective coating and construction method thereof
  • High peeling resistance concrete surface protective coating and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0039] Example 1: Protection of concrete gravity dam against erosion and freezing and thawing damage.

[0040] During the construction period, the temperature is 20°C-27°C, and the relative humidity is 30%-60%. Grind the overflow surface with an angle grinder, wash away the dust with a large amount of water, and expose the aggregate section; roll coat HK-G-4 epoxy grouting material long-term active primer, and the primer will be in the "adhesive force is not low" after 2.5 hours At 0.1MPa, the area of ​​the primer stained during the test does not exceed 10%", this state lasts for 4 hours, during which the first coat of HK-966 elastic paint is scraped, and thereafter HK-966 is scraped once every 24 hours. 966 elastic coating until the design thickness 2mm (see figure 1 ). During roller coating and scraping coating, coat the same part back and forth at least 3 times, and the first coat should be so thin that the substrate of the previous process can be seen (thickness not exce...

example 2

[0041] Example 2: Anti-carbonation protection of concrete gravity dam.

[0042] During the construction period, the temperature is 12°C to 37°C, and the relative humidity is 30% to 92%. Before the protection, the concrete of the dam body was blackened by the adhesion of pollutants, and the concrete on the surface was sandy due to carbonization, and the deepest carbonation depth exceeded 5mm. Use high-pressure water jet cleaning equipment, control the cleaning pressure not to exceed 25MPa, wash away the carbonized layer, and expose the fresh aggregate section. After natural air-drying, roll the HK-G-2 epoxy grouting material long-term active primer. After 2 hours, the primer is in the state of "adhesion is not less than 0.1MPa, and the area of ​​the primer that is stained during the test is not more than 10%". This state lasts for 3 hours. During this period, scrape HK-E003 elastic epoxy mortar. Since the temperature on site exceeds 35°C and the relative humidity exceeds 85%, ...

example 3

[0043] Example 3: Anti-seepage engineering of the upstream dam face of a concrete face rockfill dam.

[0044] During the construction period, the temperature is 5°C to 20°C, and the relative humidity is 60% to 100%. Before the protection, the concrete panel was blackened by the adhesion of pollutants, and the surface was carbonized to form a thin sandy layer. The silt covered the panel. There was a difference in the pouring quality of the panel during construction. The aggregate was exposed in the most serious part, and there were many cracks on the panel. Use high-pressure water jet cleaning equipment, control the cleaning pressure not to exceed 25MPa, wash away pollutants and silt, and expose the fresh aggregate section. After natural air-drying, roll the HK-G-2 epoxy grouting material long-term active primer, and after 4 hours, the primer is in the state of "adhesion is not less than 0.1MPa, and the area of ​​the primer that is stained during the test does not exceed 10%". ...

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Abstract

The invention relates to a high peeling resistance concrete surface protective coating and a construction method thereof. The invention aims at providing the high peeling resistance concrete surface protective coating and the construction method thereof. The high peeling resistance concrete surface protective coating is characterized by comprising a long active primer layer, an elastic epoxy mortar layer and an elastic coating which are sequentially arranged on the surface of concrete. The coating is applicable to the field of concrete protection.

Description

technical field [0001] The invention relates to a high anti-peeling concrete surface protective coating and a construction method thereof. Suitable for concrete protection field. Background technique [0002] Concrete has become the most widely used building material due to its good water resistance, easy molding, and cheap availability. aisle. Almost all deterioration reactions of concrete require the participation of water, and water is also a powerful carrier for harmful substances to enter and exit concrete. [0003] Since the 1950s, a large number of water conservancy and hydropower projects have been built in my country. The concrete of hydraulic structures is directly exposed to nature, and has been subjected to water immersion or high humidity for a long time. The service life of the object can reach or exceed the design period, and it needs to be reliably protected. [0004] Organic polymer coatings have excellent weather resistance and water resistance, are easy...

Claims

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Application Information

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IPC IPC(8): E02B3/16
CPCE02B3/16
Inventor 刘德明吴启民林忠华王丽娟程红
Owner HANGZHOU GUODIAN DAM SAFETY ENG
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