Concrete base for large shed

[crofter]

I need to lay a 9m x 6m base for a shed. I will use readymix delivered by lorry. Since it is too wide to span with a tamping batten should I lay it in sections and, if so, how do I separate the sections without leaving formwork set in the concrete?

[mikester]

Pull out the trammel bars the next day and fill in with sand and cement