right,got a little job on,need some specs for re-bar and concrete to be used,its only for a section or road so nowt too complicated,this anyone,s feild?

What do you want to know?

I have a city and guilds in concrete technology....

Not used it for a while tho

Cheers

Mark

done a job where road collapsed,its called "swallow holes",water has washed away the gravel/soil etc.
we have to fill the void with X hundred tons of concrete and use rebar for below the road bed.
concrete supliers need to know the spec and steel supliers need to know what spec for the re bar grid,any ideas?

Chuck some old bike frames in, it'll be alreet.

one family threw some fridges down the hole when their kitchen went south for the winter

Not easy without seeing it, but I would probably fill it with semi dry lean mix suitably compacted, to a level about 120mm from the finished surface, then lay 80mm concrete block paving to finish.

If it sinks a bit you can just lift the block paving out, add a bit of fill then relay.

If you use a concrete slab, and the sublayer sinks then the slab can break up and cause damage to vehicles passing over it.

HTH

Mark

k cheers for your help mark.see what gives