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Old 04-18-2012, 05:57 AM   #1
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Concrete Patio...what type of mix: 4 sack, 5 sack, 6 sack


Planning on a 27' x 21 concrete patio slab for the backyard. Am taking estimates from local contractors.

I know that 6 sack has more "compressive strength" than 4 sack mix.

One of the contractors mentioned 4-sack. I know 4-sack is less expensive than 6 or 6.5 sack mix and I have no problem paying the little extra for the higher sack mix if in the long run the higher sack mix will stand up better to the elements???

BUT is there a reason NOT to use a 6 or even 6.5 sack mix for a concrete patio slab? I live in Ohio where winters get cold with lots of snow.

Thanks.

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Old 04-18-2012, 11:55 AM   #2
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Concrete Patio...what type of mix: 4 sack, 5 sack, 6 sack


I live in Canada and I've never heard concrete referenced this way. But some things to make sure you have is:

Air entrainment (6% +or- 2%)
Max. water to cement ratio (0.50)
Minimum srength 28Mpa (4200psi)

No reason not to use higher compressive strength mixes besides cost.

Durability comes from the air entrainment, quality of concrete (aggregates, cements, admixtures) and the finishing.


Last edited by psilva8; 04-18-2012 at 11:58 AM.
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