I have made further progress on my pool project and completed the stone wall. It's time to cast a concrete edge on top of the stone wall as a border to attach the fence and as an edge for the stone paving itself. It is a total of 35m of concrete edge distributed over 3 sides with lengths of 13x15x7m as you can see in the attached picture.
I'm considering dimensions of about 600mm wide and 200mm thick for the edge but am flexible for now.
Is there anyone who can give me advice on how to consider dimensions for the concrete, reinforcement, and other smart tips?
Is there reinforcement coming up from the stone wall?
I will drill reinforcement into all the larger stones in various directions that the concrete will bind into. So there will be many irons. I plan to splash primer on the stone as well before casting.
Yes, it's true that the concrete edge extends a bit outside. I will shape the bottom of the form as best as I can and then fill the remaining gap with mortar.
You should build the mold with a slight slope on the surface so that water does not pool on the edge. Standing water will eventually cause the surface layer to freeze and crack.
You mention it being 600mm wide and 200mm thick, doesn't that seem very wide? Won't it look bulky?
Regarding the reinforcement, I would probably bend inverted U's that I tied to longitudinal rebar to form a grid with c-c 100-150 mm. Note that the rebar should never be less than 3 cm deep into the concrete as it may then rust and cause the concrete to crack.
Cut the mold as accurately as possible and then pour in two stages. Make the first batch slightly drier so it doesn't flow as easily, thereby sealing the bottom of the mold. You can also use this to fix the reinforcement so you don't need boards above the mold to hold the reinforcement in place when you make the final pour, making it easier to pull off, remove it, and steel-trowel it.
Regarding the slope, I will make sure to have a slope on the concrete, thanks for the reminder.
I was thinking of 600mm because I have a granite slab that is 600x300, which should be placed against the concrete at the outer edge with joints, the rest will be laid in 2-5. But maybe I'll make the edge 300 wide and place the stone only as a frame around it. But the concrete will not be visible.
Thanks for the tip about the reinforcement.
Would you use 12mm reinforcement, or what is suitable?
Are there risks with too much reinforcement?
I was planning to drill down reinforcement bars into the granite and then weld the rest of the reinforcement to these bars so they can't move during the pouring.
Good idea to pour in 2 stages. I can mix myself for the first layer and for the second, I'll order a concrete pump as it will be about 2-3 cubic meters if the form is 300x200mm and 35m long. I'm also thinking of casting a staircase at the same time.
I'm just a layman in the field and this isn't a load-bearing structure, but I would probably go with 12mm steel.
There is no harm in having too much reinforcement, but the distance between the steels must have a good margin for the largest ballast in the concrete.
Concrete withstands compression well, but it's terrible at handling tensile loads. In your case, there are risks of settling in the stones that support the concrete beam, so as long as the stones are on well-drained ground to prevent frost heaving, the reinforcement in the lower half of the beam is most important (Tensile load in the lower part, compressive load in the upper part).
Form braces can be found, for example, at Beijers.
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