Concrete strength

   / Concrete strength #31  
Anytime you use something in a way it was not designed for you are walking new ground. Buy a culvert (metal, concrete, or plastic) and be done with it worry free.

A beam does not care what it was designed for, but I agree with the second sentence.
A lightly reinforced beam will not be able to support much weight
 
   / Concrete strength #34  
Unless there is some other factor militating against it, I would go with the culvert suggestion. It will be easier, cheaper, more trustworthy and make a wider crossing.
 
   / Concrete strength #35  
In most cases aggregate size is not considered, during design of reinforced concrete. In rare cases for appearance or clearance issues aggregate can be specified
 
   / Concrete strength #36  
Hmm two guys quabbling over the size of pebbles.. which shows free advice is worth just that... 😀
 
   / Concrete strength #38  
A beam does not care what it was designed for

Yea, but these were columns that were designed to be loaded linearly and the greatest lateral force was to control buckling. The loads were very light because there is so little rebar. Also, notice the design value of the concrete was 4,000 psi, but it tested "not less than 3,300 psi". This means the engineer rejected the concrete and these columns were removed from the building because they were defective.

Honestly, I'd guess that a good drop would crack these "beams".
 
   / Concrete strength
  • Thread Starter
#39  
I anticipate going to a culvert/steel pipe system instead. Thanks for the inputs.
 

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