Concrete

[Bigfoot]

As long as you mix in the right proportions, it doesn't differ from ready-mix; you're in control of its strength. If you trust your own mixing ability, it's up to you.

No, I've just realized that I probably don't trust my own ability. It seems like there are a million different recipes for mixing proportions and types of ballast. I guess I'll have to go with concrete bags instead so that I can just follow the recipe on the bag. I don't want the plinths to start crumbling or something.

 

[tiggre]

To be picky, it's actually 23

I thought it was 16 liters/25 kilos pre-mixed? Was I so wrong

There's nothing worse than running out of a few bags when you're casting

 

[Mats]

13 is more realistic and no, there's nothing so damn annoying as when there's a single liter missing in the form so you have to make a small batch again.

 

[Bigfoot]

A follow-up question, how long and carefully must you protect the concrete from water?

I have dug the plinth holes and in some of them, a bit of water is seeping in. Now the ground is probably quite soggy since it has rained a lot, so I hope it disappears with better weather, but it might be good to have a plan B in readiness.

(Incidentally, I hit rock in seven out of eight holes, so it will probably only take half as much concrete as I expected.)

 

[zankan]

A follow-up question, how long and carefully do you have to protect the concrete from water?

I have dug the post holes and in some of them, a bit of water is seeping in. Now, the ground is probably quite wet since it has rained a lot, so I hope it disappears with better weather, but it might be good to have a Plan B in readiness.

(By the way, I encountered bedrock in seven of eight holes, so probably only half as much concrete as I expected will be needed.)

Actually, you don't need to protect anything, but it doesn't hurt for it to cure undisturbed for a few hours....

 

[Bigfoot]

That sounds good. Then it should be enough to pump out the worst and maybe place the gjutrör in a plastic bag.