Casting flagpole - concrete consumption

[Nybyggaren12345]

I need to cast a foundation for a 12m flagpole. The hole is 40cm wide and 120cm deep. But how much concrete will be needed? According to an online calculator, it’s a cylinder of about 600 liters and one bag of expansion concrete at byggmax provides 13 liters. Do I really need 600 liters of concrete?!

 

[Bart]

Is it a round or square hole?

Edit: it says cylinder. Approximately 150 liters of concrete.

 

[e02jr]

No, 150 liters.

You probably entered that the radius is 40cm, but it's actually 20cm.

 

[A76261]

About 150l if it is a cylinder, if I'm not completely misremembering the school math.

 

[Nybyggaren12345]

No, 150 liters.

You probably entered the radius as 40cm, but it's actually 20cm.

Of course, thanks!

 

[Daniel 109]

Why should you use expanderbetong? Isn't regular coarse concrete better?

 

[fribygg]

Why should you use expanding concrete? Isn't regular coarse concrete better?

How would regular coarse concrete be better, do you mean @Daniel 109? I think that coarse concrete is cheaper but hardly better.

 

[Matti_75]

Absolutely no expansive concrete is needed for a flagpole foundation.

 

[Daniel 109]

How would regular coarse concrete be better, do you mean @Daniel 109? I think coarse concrete is cheaper but hardly better.

Cheaper is one aspect that makes it better. The function is not worse. I can't see any advantage with expanding concrete for this.

 

[BSOD]

Grovbetong is the right product here.

 

[gusvo085]

Wouldn't it work very well to throw a lot of stones into the foundation? It should mostly be a counterweight that holds it together. Maybe 50% larger stones?

 

[fribygg]

Wouldn't it work very well to throw in a lot of stones in the foundation? It should mostly be a counterweight that holds together. Maybe 50% larger stones?

'Procentning' during casting is a traditional method and if you have clean stones to put in or for that matter concrete scrap, it should work well in such a foundation.

 

[NoOne2k]

Wouldn't it be very good to throw a lot of stones into the foundation? It should mostly act as a counterweight that holds it together. Maybe 50% larger stones?

A foundation for a flagpole might not exactly be rocket science, but generally speaking, you should increase the amount of cement if you're mixing other things into the bags of coarse concrete.

 

[Daniel 109]

Larger stones do not noticeably increase the need for cement.

 

[Nybyggaren12345]

And even though the plot is quite small, do I need to water it for the next couple of days?