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Concrete Exposure Class C-2 - CSA A23.1 Question

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Baffled Engineer

Baffled Engineer

Structural
Jul 27, 2018
56
Is there a particular reason why the concrete exposure class C-2 in CSA A23.1 is specifically for unreinforced concrete as specified in the table below?

The exposure class was specified in a new buried reinforced concrete reservoir and I'm not sure if it's applicable. The max w/c ratio required for C-2 is 0.45 compared to 0.4 for C-1, so the C-2 class will probably reduce the shrinkage potential of the concrete and therefore less cracks, but I'm not sure if it's applicable if the table says it's only for unreinforced concrete.

Exposure_Class_xuwkck.jpg
 
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Does your design need the reinforcing for strength? Or is it essentially only a temperature and shrinkage requirement for steel?
 
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Yes it needs reinforcing for strength, and also for limiting crack widths for water retaining structure. There is excess steel in terms of ultimate strength, but it's there to limit service stresses in steel and also crack widths.
 
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Because the increased permeability of the mix doesn't provide the same level of protection to structurally important reinforcing.
 
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I don't have my CSA-A23.1/A23.2 handy right now, but I also believe the required curing is different for C-1 versus C-2. And the increased curing requirements for C-1 should help limit the additional shrinkage you're concerned about by going to the lower W/C ratio.
 
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