Concrete strength

   / Concrete strength #1  

yanmars

Veteran Member
Joined
Nov 29, 2009
Messages
1,057
I have a chance to get some concrete that is 1 foot square, with 4 pieces of 5/8 rebar in it. It would span 7 feet over a drive way to let water under. Any idea what those concrete pieces would carry in weight. There would be 9 of them but the tires would ride on just two of them.
 
   / Concrete strength #2  
How does a 'one foot square' hunk of concrete span 7 feet ?
 
   / Concrete strength #4  
Is the rebar in each corner or is it all on one side
 
   / Concrete strength #5  
Placement of the rebar will be required to determine strength. Concrete strength is also required as well as maximum aggregate size.
 
   / Concrete strength #6  
Is there any rebar installed transverse in the beam
Unless the concrete Is homemade the strength should be 3000 PSI minimum
Aggregate size does not factor in beam strength
 
   / Concrete strength #7  
Maybe Egon was thinking of rocks being added as fill?? Aggregate size is standardized and should be appropriate for the PSI listed on the bag. We added plastic fiber to bridge abutments we poured.
 
   / Concrete strength #8  
You could recess 3 on each side and pour a 4 inch cement cap to spread the weight over several "beams" . Or something like weight distribution over multiples.
 
   / Concrete strength #9  
It would depend on what the concrete pillars were designed for...horizontal vs vertical load bearing, what is the source of the concrete?
 
   / Concrete strength #10  
I have a chance to get some concrete that is 1 foot square, with 4 pieces of 5/8 rebar in it. It would span 7 feet over a drive way to let water under. Any idea what those concrete pieces would carry in weight. There would be 9 of them but the tires would ride on just two of them.

No enough information provided to make a determination.
 

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