Aggregate size in relationship to reinforcement clearance

[eatapeach]

I have been searching for the aggregate gravel size in relation to reinforcement clearance. I remember reading once that the reinforcement clearance could not be less than 1.5 the aggregate size. In other words, if the aggregate was 1", the clearance had to be a minimum of 1 1/2". I thought this was in ACI 318; however, I can't seem to find it now.
I am asking because the engineer shows 1" clearance on the sides and 3/4" clearance on the bottom side of the tilt wall panels, yet the mix design indicates 1" aggregate.

 

[Lomarandil]

I don't have the reference at hand, (or the time to look at the moment), but your recollection is correct, it's in there. In the minimum bar spacing requirements, location of which varies depending on which edition of ACI.

edited corrections for future reference

 

[BridgeSmith]

AASHTO has the same spacing limits for reinforcement - for bars in a horizontal layer, in the orientation that it's poured. The spacing is smaller for bars that are stacked vertically (one above the other, again, in the position they're in when the concrete is poured.

 

[dauwerda]

ACI 318-19 specifies minimum clear spacing of reinforcement requirements in section 25.2.

I don't believe this is meant to be applied to the distance between the reinforcement and the forms however (which it sounds like that is what you are talking about), which is generally referred to as concrete cover, it is instead the distance between one reinforcing bar to another.

The required concrete cover is specified in section 20.5 and that is not dependent on aggregate size.

 

[BridgeSmith]

I don't believe this is meant to be applied to the distance between the reinforcement and the forms however (which it sounds like that is what you are talking about),

Oops, I read it too fast. Yeah, I think you're right.

 

[andrews2]

In 318-14 and 318-19 it's Section 25.2

It's actually 4/3 of the aggregate size along with some other requirements.

 

[Lomarandil]

Dauwerda is right, that doesn't technically apply to the cover dimension.

Should it? Probably. Even a precaster would have the same types of issues with concrete placement and consolidation. But technically, not applicable.

 

[OldDawgNewTricks]

Although it is not technically applicable to site-cast concrete, you might consider the PCI Quality Control Manual (PCI MNL-116) 3.1.4 criteria that maximum size of coarse aggregate shall not exceed three-fourths of the minimum clear cover.

 

[Enable]

If you don't mind using Canadian codes we have such a provision for cover / max aggregate size in CSA A23.1