|
Hello Narayan,
I'm not a concrete expert but from the research that I did prior to building my pier last year I would agree with the advice in the previous posts. That is, definitely use some reinforcing steel, to help hold the block together, and you can specify the strength when you order ready-mixed concrete. From what I can gather, it is the quality and amount of "rock" (eg. blue stone) in the mix that enhances the strength. I have heard that some pre-mixed concrete (ie. hardware store type - just add water variety) has some very cheap "rock" in it.
I think "ordinary" concrete, like that you'd use for a slab around a BBQ for example, is typically 20 MPa strength. Concrete used for structural purposes is typically 40 MPa I think.
My concrete pier and block is probably oversize, but I used 25 MPa concrete with an abundance of steel reinforcing in the block and pier itself.
Hope this helps,
Chris
|