What are these, and are they ok?

[gsozz]

These brick sized concrete blocks were used to support all the rebar in the bottom of the fottings in this prepour inspection. They were placed approx every 6 to 10 feet with the rebars re3sting on top of theme in most places.

Is this what is refered to as a "dobie" .

Thanks,

gsozz

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[hausdok]

Look like dobies. Is that a post-tensioned slab? You can find out lots about those on the Concrete Network.

ONE TEAM - ONE FIGHT!!!

Mike

[monte]

Dobie, Yes, The dobie is used to provide the proper clearance between the edge of the form (This case the soil is the form) and reinforcement, so that the placed concrete will cover the reinforcement completely. Most of the time there is not enough dobie placed, so that the belly of the rebar will not have the design clearance. Rule of Thumb for clearance is double the size of concrete aggregate add ½â€