Crack due to drying shrinkage of concrete 2019/09/20

This time, it was made on the slab side


"Crack due to drying shrinkage"
Will be repaired.

 


This is a phenomenon that occurs when surface moisture is rapidly lost when placing concrete.
(* It is a phenomenon that is especially common in the summer when the sunlight is strong)


The crack depth is shallow and most of the cracks are concentrated on the surface.


In the investigation, the surface strength was sufficiently maintained, so we will only improve the appearance.



Before construction

Before dry shrinkage crack construction



Crack are concentrated in the area surrounded by chalk.




If you look closely, ...


Dry shrinkage crack up before construction


There are many crack in the shape of a hexagonal shell.





"Prepared materials"


・Royal W21

・Repair Resin (45 minutes type White)

・C Repair Color (# 3 Dark Gray)

・Tone Color (black / yellow)

 



"Procedure"


1. Make an admixture (5 to 10 water: 1 Royal W21)


2. Clean the construction surface and lightly moisten it with a Brush.


3. Gently knead the admixture and "Repair Resin", and apply a large amount with a gold trowel.


4. When it is half-dried, remove excess material with a scraper.


5. After it is completely hardening, rub it well with # 600 Waterproof Sand Paper until the difference in level and trowel-coating marks are familiar.


6. Clean the dust with a blower.


7. Adjust the "C Repair Color".

* Try blowing and check the color. Fine-tune with "Tone Color" to match the brightest surrounding colors


8. Spray "C Repair Color". In some places, rub it with # 600 Waterproof Sand Paper to blend it in.


9. "Tone Color" for pattern is toned. Prepare 3-4 types of colors with different shades and shades.
* Apply a small amount of "Tone Color" diluted with water to the "Pattern Pad" in an inconspicuous place.Check the color.


10. Make a pattern with the "Pattern Pad".
* If the pattern does not match, adjust by tearing the sponge part by hand.





Enlarged image after construction
Up after dry shrinkage crack construction



After construction
After drying shrinkage crack construction





Full view after drying shrinkage crack construction





The appearance has improved considerably.



Also, because the surface layer is crack,



If you make a fine particle polymer cement( Repair Resin products ) into a paste, it will be fully clogged.

 

 

 

 

 

The materials used this time that can be purchased at our shop

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At a Concrete Repair Shop, We sell tools and materials that can be used for partial repair of concrete.

 

In addition, a simple concrete repair method that anyone can do is also open to the public!

 

Even in the video, we are opening useful information on site such as various repair methods related to concrete!