Concrete on pea gravel


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Old 08-19-10, 09:41 AM
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Concrete on pea gravel

I just finished puring a new sidewalk and it came out so good that I am going to replace 30' of gravel walkway.

The walkway is 2-3" of pea gravel on top of a clay base. The base was plate compacted before I put in the gravel. When I did the sidewalk I ran a plate compactor over the gravel walk again. My question is, will I have a problem pouring a 4" concrete walk directly on top of the pea gravel?
 
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Old 08-19-10, 10:12 AM
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Pavers on gravel - no good

I think concrete on gravel might work, though - I'd swear that's what under my basement slab
 
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Old 08-19-10, 10:17 AM
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A slab with living area over it usually has a gravel bed to facilitate drainage. It should be ok to pour concrete over your gravel walk although you might want to give the concrete a little more depth along the sides.
 
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Old 08-19-10, 11:05 AM
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Originally Posted by marksr
you might want to give the concrete a little more depth along the sides.
Makes sense - seems like that would hold the gravel in place better
 
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Old 08-19-10, 11:49 AM
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Thanks guys. I thought it would probably be OK but concrete isn't exactly my strong suit so I thought I would get some other opinions.
 
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Old 08-19-10, 02:40 PM
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  #7  
Old 08-19-10, 02:57 PM
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For a 30' sidewalk, it should be adequate. I would not worry, but if it was for something regarding strength, life or safety, you can always hire an inspector, make tests and supervise construction
(LOL).

Just amke sure the concrete is not too wetplaced properly and not over-finished. The finish choice is up to you. If you are in a colder climate, try to use air entrained concrete for durability.

Dick
 
 

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