Filling pit with concrete...need advice


  #1  
Old 09-29-05, 03:56 PM
lilslyk
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Filling pit with concrete...need advice

I'm going to fill a pit (the pit is cut out of concrete) with concrete, and I need some advice/recommendations.

The pit is approximately 8'x7'x2' deep and the final load upon the concrete could reach 9,000 pounds.

My plan is to drill into the existing concrete and install rebar as well as put a metal mesh halfway deep in the slab all the way across. Am I on the right track here? Just want to be sure the concrete won't crack, will look ok, and will be stable enough to support the loads to be applied.

Thanks for advice,
Matt
 
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Old 09-29-05, 04:23 PM
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Filling pit with concrete...need advice

If you have a concrete bottom in the pit, just dump it full of concrete. Steel is not needed. You don't need steel to prevent shrinkage cracks since it is so small. When the concrete shrinks, it wll pull away from the existing concrete slightly. Do not use a real wet mix or a real strong mix since it will shrink more.

The load of 9000 pounds is nothing comparred to the 16,000 pounds of concrete you are filling the hole with.

After it has cured for a while, you can caulk the joints for appearance.

Dick
 
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Old 09-30-05, 08:02 AM
lilslyk
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Thanks for the good quick reply.

I forgot to mention one thing (kind of a big thing imo, was in a hurry). The pit is open on one side..so the pit will have 3 walls and I will need to frame the other side to pour concrete in the pit. Will I still not need any steel in there to keep the whole slab from sliding or shifting towards the open side?

Thanks again,
Matt
 
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Old 09-30-05, 09:47 AM
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Filling pit with concrete...need advice

Just form up the fourth side. brace it and fill. The concrete will set in a few hours. You can leave the form in place or remove it the next day.

The concrete is not going to go anywhere, but you can put steel in to make you sleep better.

Dick
 
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Old 09-30-05, 10:22 AM
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You got it. But boy make sure that form on the one side will hold like said brace it Then brace it again . Id put some 6X6 mesh down in a 7'X8' X2' slab. With some rebar around close to the outside of it all. I come up with about 4.2 yards you need ??

ED
 
  #6  
Old 09-30-05, 10:26 AM
lilslyk
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Thank you! Exactly the information I was looking for. I won't bother with any steel, I will just fill that sucker with concrete!

Matt
 
  #7  
Old 10-03-05, 02:02 PM
lilslyk
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Thanks Ed for the comments.

When you suggest putting rebar around the outside, do you mean in a verticle fashion or horizontal? I was thinking horizontally with the ends drilled into the existing concrete walls inside the pit. LMK if this is the correct thinking.

Matt
 
 

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