Lack of Concrete Placement Tolerances
Lack of Concrete Placement Tolerances
(OP)
I have a project and for some reason there is no 3100, 3200 or 3300 series in the spec. There appears to be an old generic simplistic single concrete spec. There is no reference to ACI-347 or ACI-117 which would be the placement tolerances for formwork and concrete. In the absence of a specific specification reference to industry standard tolerances what should be used? Is there any path through the building code referencing ACI-318 that will officially get me to the ACI-347/ACI-117 tolerances? How would you approach this situation?






RE: Lack of Concrete Placement Tolerances
Are the designer, contractor, or owner?
RE: Lack of Concrete Placement Tolerances
RE: Lack of Concrete Placement Tolerances
I don't keep the code or ACI refs at home and may not be not entirely on target on this and encourage you to check how the IBC defines structural concrete.
Etippers......feel free to shoot me down if that was some BS!
it seems like the Structural Egr is absent in this scenario
RE: Lack of Concrete Placement Tolerances
While the IBC specifically references ACI318, I do not believe ACI318 actually references ACI301(and then everything else that if referenced there) in the body of the Code. Chapter 7 has references to reinf placement tolerance, but I don't think the member tolerances are referenced in 318.
RE: Lack of Concrete Placement Tolerances
RE: Lack of Concrete Placement Tolerances
RE: Lack of Concrete Placement Tolerances
RE: Lack of Concrete Placement Tolerances
ACI 301-10 uses the phrase:
"1.7.2 Dimensional tolerances
"1.7.2.1 Unless otherwise specified, construction tolerances
shall conform to ACI 117."
ACI 301 relies upon ACI 117 when ACI 318 is used. ACI Committee 117 does not create tolerances, but is a repository for tolerances previously appearing in 318 and 301 (and other documents.) It is generally understood by the code committees that following 117 with a 318 design and 301 construction with result in a building built to meet the code. I cannot find a solid code language reference to tie this all together, but the introduction to 318-11 does say:
"Generally, the contract documents should contain all of the
necessary requirements to ensure compliance with the Code.
In part, this can be accomplished by reference to specific
Code sections in the project specifications. Other ACI
publications, such as “Specifications for Structural Concrete
(ACI 301)” are written specifically for use as contract
documents for construction."
I will check with the 318 and 301 committees (I am on 301) and see if we need to change how 117 is referenced.