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RE: 50' oc control joints for SOG ok?

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I went to a CRSI seminar on slabs on ground. They had an example using several different methods to calculate the reinforcing required for a 6" slab. One them was the subgrade drag. They also gave a list for the method to be used in terms of performance required.

1)Subgrade drag-Commercial (reinf. plus control joints)

2)Modified subgrade drag-Industrial (reinf. plus control joints)

3)Temperature-climate controlled

4) Equivalent strength-industrial

5)Crack restraint-Food processing, hospitals

The range of reinforcing required was quite large between the methods. But even with all that, the 50ft spacing seems a little large to me also.  They had some large spacing like that in their example using the subgrade drag method also.


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