I am designing a slab to a water treatment works reactor where the slab is to rest on a layer of no fines concrete that acts as a drain should any effluent get through the slab. The design from our water department is for 12m long slab sections. The slab is 150mm thick. I know that the no fines will bond to the slab cast over it and will resist almost all movement. This will reslut in cracking. Now to limit my crack widths to say 0.2-0.3mm, what rebar would you consider sufficient?
I am using BS8007, liquid retaining structures, and get Y10's @ 200mm centres. But would it be prudent to have even more rebar seeing that the slab is cast onto a substrate with which it will form a very strong bond and resist any shrinkage movement at the bottom?
I am using BS8007, liquid retaining structures, and get Y10's @ 200mm centres. But would it be prudent to have even more rebar seeing that the slab is cast onto a substrate with which it will form a very strong bond and resist any shrinkage movement at the bottom?