Missed that you built a tent for the plastic.
Unfortunately, it is likely that it dried too quickly as the water evaporated from the concrete.
The plastic should lie closely against the concrete so that the moisture remains.
 
You should hope for the best, it's likely that the shrinkage cracks are superficial and it's the other side that will be visible.
 
But it was so messy that I was afraid the plastic would mold into the concrete if it lay directly on it.

Yes, let's hope it's superficial. I've sprayed some more water on it now, but it's probably too late. I sprayed water for two days after pouring and then I was gone on Midsummer's Day (day 3, that is), so there was no watering. Now that I came home (day 4), it looked like that with cracks.

But can I still use a little husfix? It might not help, but it would feel a bit more secure. Just as long as it doesn't make things worse in any way?
 
That looks very strange? :thinking:.
As someone wrote earlier, the concrete looks very sandy, and it shouldn't crack around the mesh like that.

The important thing is the top side, so you'll have to see how it looks when you remove the form.

Husfix adds nothing more than cosmetic.
 
But when can I turn and see then? Should I wait another day?
 
4 days today, right? It's safest to wait another day :)
 
How have you mixed it? Doesn't look too good.
 
Stefan N Stefan N said:
How did you mix it? Doesn't look very good.
Drill with a mixer in one of those barrels that you mix concrete in. However, I had to add a bit more water than it said on the package for it to even be possible to mix and get all the concrete wet.

Text in Swedish describing the use, safety, and mixing instructions for concrete, featuring Bauhaus branding.

Drill with a mixing attachment in a bucket of concrete mixture, showing the process of mixing with added water on a balcony.
 
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P
Well, it takes about 7 days to reach 50-75% strength and 1 month for 90%.
 
Erik_Hansson said:
Well, it takes about 7 days to reach 50-75% strength and 1 month for 90%
Why isn't anything mentioned on the packaging about this?
 
peterwesterlund peterwesterlund said:
Why is there nothing on the packaging about this.
The interesting information is usually found in a data sheet...
 
The package looks like Bauhaus's cheapest fine concrete, I think that's why it looks the way it does.
Expanderbetong usually works better.
 
F
See it as the third attempt being the one that succeeds! Then you get to be the one who gives all the advice here.
 
F Freddedan said:
See it as the third attempt is the one that will be good! Then you can be the one giving all the advice here
Haha oh my god no I can't be bothered to do it again. It took forever to build the frame. Doubtful if it can be used again. First, I need to see how the top turns out. If there are no scratches or many cracks and it can be sanded nicely, I'll keep this one. I don't care how the underside looks.
 
The longer you wait with the formwork removal, the greater the chance it will hold at the weak parts (small cross-section). If you remove it now or in a day, it is very likely to crack/break.

Water on the concrete and waiting is key, preferably also plastic directly on/against it to reduce evaporation. I wouldn't remove the formwork in the first week and would try to wait an additional week. Even if the concrete holds after a week, there's a high chance that pieces will come off at the form edges.
 
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