This photo show steel reinforcement laid over steel sheeting, prior to pouring the concrete.
Mesh chairs ?? are used to keep the reinforcement in the correct place. If the strenght of the reinforced concrete slab is to be maximised, reo has to be in the correct place, ie where the slab is in tension.
Black wire ties hold the reo in place. This appeared to be a very tedious process. Workmen wore gloves to protect their hands.
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