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RE: ACI 318 Appendix D

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In our detail we did call for 2.5” dry pack and we should have indicated surface to be cleaned and free of oil and grease.  For all cases (2 so far) that the contractors did not want to drill through footing, but we discuss with the owner and the architect to lengthen the SW to the point that we can use post-installed anchors.  As a matter of fact using through bolts is not what we prefer but we do indicate this in our detail as one of the options.  There may be other better solutions out there.  I would say the best solution is to discuss with the entire team to address the issue.



From: Jnapd(--nospam--at) [mailto:Jnapd(--nospam--at)]
Sent: Friday, April 17, 2009 12:47 PM
To: seaint(--nospam--at)
Subject: Re: ACI 318 Appendix D




Do you call for 2" of grout or 2" of drypack. and clean bottom of footing surface.


Have you had any feedback as to the size of the slab opening and new excavation required to achieve this ??


Joe Venuti
Johnson & Nielsen Associates
Palm Springs, CA


In a message dated 4/17/2009 11:59:04 A.M. Pacific Daylight Time, FTang(--nospam--at) writes:


There is high strength grout between footing bottom and bearing plate top, then grout metal parts all around with minimum 3” concrete cover before backfilling will soils under concrete.



From: Michael Hemstad [mailto:mhemstad(--nospam--at)]
Sent: Friday, April 17, 2009 11:12 AM
To: seaint(--nospam--at)
Subject: ACI 318 Appendix D



am I to understand you put the steel plate and bolt head in the dirt, then pour concrete over it?  What about corrosion?


Mike Hemstad


Minneapolis, Minnesota


Freeman Tang wrote:


Through-bolts with bearing plate at footing bottom and embedded anchors

in footing are different in the way that through-bolts are externally

applied load from the underside of the footing and cast-in- anchors are

internally exerting forces inside the concrete footing.




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