Concrete that very likely would pass inspection

[jackaustin]

Basically, what is the best concrete you could make for footings? Assuming average ground conditions. (I've got clay and gravel, need a pick to dig it up.)

P.S. I'm not actually sure there is a best as such. Maybe there is just a concrete mix for footings ( I think 1:6 using all-in ballast). What say? Thanks.

Please note that this is about concrete passing inspection, not footings in general. Maybe there is only one standard quality of concrete for footings.

 

[BridgeSmith]

I'm not sure of what you're asking. If you want to know what quality of concrete is necessary to pass inspection, it's typically one that exceeds the minimum specified strength at 28 days of age.

Rod Smith, P.E., The artist formerly known as HotRod10

 

[Tomfh]

1:2:4 is ok for most footings, assuming normal loads.

 

[jackaustin]

@BridgeSmith thank you for your response and suggestion

 

[MotorCity]

Pass the inspection of whom? Passing any "inspection" should simply confirm that the concrete selected is appropriate for the job. This involves not only soil conditions, but needs to consider loads as well. If your footing is supporting a mailbox post, you could probably use 2000 psi concrete. If your footing is supporting a 10 story building you may need 5000 psi concrete. There is no blanket statement that can be made regarding the best type of concrete to use across the board.

 

[StrEng007]

I agree, this is very broad. The demand will determine the mix and quality of the concrete you need to pour. That demand is multifaceted, it has to do with both the required loading from your structure and the limitations/conditions of the site (earth) where it is being poured. I would start getting familiar with ACI 301 and the durability requirements discussed in ACI 318.