Hello, everyone.
This is Enta.
I'm sure you've repaired cracks in slopes before—have you ever had a case where you could say, "I fixed it perfectly!"?
I've never been able to do it either, based on my own experience.
No matter how many times you repair it, cracks will always appear in the same spot.
What Is a Hairline Crack?
| Caused by the contraction and expansion of mortar and concrete due to temperature changes, resulting in surface...
Cracks no wider than a strand of hair (0.3 mm or less) and no deeper than 4 mm Since it does not affect the structure or cause the rebar to rust, it is generally considered that no repairs are necessary. This is just a rough guide. |
Other than that, these are cracks related to the structure, so even the average person can
You can easily check this using a crack scale.
It's handy to have a crack scale like this.
It's especially handy when an inspector starts saying, "There's a crack..."!
I could proudly say, “This crack is less than 0.3 mm, so there’s no structural problem!” but,
If it's more than that, I'd be a little stuck... lol
Back in the day, the way we fixed cracks during final inspections was to just spray on some cement spray from the home improvement store—whoosh! lol
It hides well for short periods of time!
If this is not a hairline crack, use a sander to make a V-cut in the crack and repair it.
Takagi EARTH MAN Dry-Cut Diamond Grooving Cutter, V-Shaped
Use a sanding disc like the one shown above to cut along the crack.
You wash that area, apply adhesive, and repair it with mortar again, but the crack reappears in the exact same spot.
Whether you inject a resin-based sealant or a glass-based one, cracks will eventually form anyway.
So that means the cause isn't there, right?
Actually...
I don't think any construction company would want to admit this, but,
Cracks aren't caused by contraction and expansion!
That's the thing.
For example, spring water seeping from slopes, signs of landslides, and various other factors.
Actually, there are a lot of cracks that are just hopeless, but every now and then I see some really bad ones lol.
I think it's okay to consider crack repair fundamentally difficult.
Well, there are quite a few repair materials like that, so I guess the best I can do is use them to cover it up.
I say that because I’ve never been able to repair something perfectly myself.
(Although part of the reason is that I have little experience repairing cracks...)
If you know of any good products, I’d appreciate it if you could recommend them to me.
I’d actually prefer a product introduction from the installer’s perspective rather than the manufacturer’s, lol.
See you later.
