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Ot engineers/construction guys
Posted on 6/21/16 at 2:28 pm
Posted on 6/21/16 at 2:28 pm
Have any of you ever heard anyone differentiate between rebar cover and rebar clearance?
12
Posted on 6/21/16 at 2:30 pm to CCTider
No. I'm pretty young as far as the industry is concerned though.
Posted on 6/21/16 at 2:30 pm to CCTider
No. I'm pretty young as far as the industry is concerned though.
Posted on 6/21/16 at 2:31 pm to CCTider
thought it was the same thing
Posted on 6/21/16 at 2:32 pm to CCTider
No. You have whatever clearance you need and that's what has to happen.
Posted on 6/21/16 at 2:33 pm to bencoleman
Some inspectors are more lenient than others
Posted on 6/21/16 at 2:37 pm to bencoleman
It could be a regional lingo thing, but at least up here cover is usually referenced when you have distance from soil grade to (most often bottom) rebar, vs clearance which can be distance from top of slab or edge of slab to rebar.
Posted on 6/21/16 at 2:41 pm to CCTider
Only difference I could see is cover is the distance between the surface of the concrete and the near face of the bar. Clearance is distance between bar faces.
Posted on 6/21/16 at 2:42 pm to CCTider
No, not really. Essentially they are the same thing but someone could call the top coverage but the bottom or sides clearance. But I could see how they could use the terms differently if they are sticklers for the coverage of concrete over the rebar but don't really care if the clearance off the ground or seal slab is a bit higher than spec. I'm wondering why on earth anyone would ever need to ask this question.
This post was edited on 6/21/16 at 2:46 pm
Posted on 6/21/16 at 2:44 pm to CCTider
They're used interchangeably...Rebar needs to have enough concrete cover (or clearance from the surface) so that the concrete can properly adhere to the rebar and allow the concrete and steel to join together in a monolithic unit.
This post was edited on 6/21/16 at 3:46 pm
Posted on 6/21/16 at 2:46 pm to NYNolaguy1
I've looked at thousands of plans, and people call out a lot of things differently. Clearance is usually horizontally (to outside of concrete) and cover will be actually top clearance - same as pipe cover - the distance from top of rebar to finished surface. It's really all the same as it refers to the amount of material between the rebar and the outside surface. JMO
Posted on 6/21/16 at 2:59 pm to Boudreaux35
quote:
Only difference I could see is cover is the distance between the surface of the concrete and the near face of the bar. Clearance is distance between bar faces.
That's what they are saying. In 15 years as a structural inspector, I've never had anyone make that distinction. And I inspected one of the largest bents/piers that's ever been built in Louisiana, so I haven't just been inspecting residential footings.
Posted on 6/21/16 at 3:02 pm to Boudreaux35
quote:
Only difference I could see is cover is the distance between the surface of the concrete and the near face of the bar. Clearance is distance between bar faces.
This is 100% correct. ACI requires minimum clearance between reinforcing members. I think its 2" or 2x bar diameter whatever is greater.
Not exactly sure on requirements of cover but its similar to clearance.
This post was edited on 6/21/16 at 3:04 pm
Posted on 6/21/16 at 3:06 pm to CCTider
they're the same, I've also heard it referred to as clear cover
Posted on 6/21/16 at 3:09 pm to finfeathersport
how does corrosion control come into play with clearance? or does it at all?
Posted on 6/21/16 at 3:16 pm to Nado Jenkins83
quote:
how does corrosion control come into play with clearance? or does it at all?
For us it's usually corroded because of winter salting the roads. You assume the bottom cover doesn't do much in terms of strength (and is usually the first to crack- its normal, mostly), but it does help protect steel from corrosion. Using an epoxy coated bar can help, but you pay for it in development lengths most often, and its ability to adhere to the concrete around it is less than if you didn't use it.
This post was edited on 6/21/16 at 3:30 pm
Posted on 6/21/16 at 3:21 pm to NYNolaguy1
thanks for that writeup
Posted on 6/21/16 at 3:22 pm to finfeathersport
quote:
This is 100% correct. ACI requires minimum clearance between reinforcing members
Except for bundle bars on bridge decks.
The tolerances are almost always identical, unless if you have partially formed surfaces and cast directly on the ground, and possibly on elevated decks.
I only brought it up because of a debate at work.
Posted on 6/21/16 at 3:23 pm to Boudreaux35
quote:
Only difference I could see is cover is the distance between the surface of the concrete and the near face of the bar. Clearance is distance between bar faces.
This is the correct answer.
Posted on 6/21/16 at 3:23 pm to icegator337
quote:
I've also heard it referred to as clear cover
I remember that term in Florida. Depending on where you are, it's funny how terminology and slang change in the industry.
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