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RE: shotcrete walls

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Jeff,
You might want to read & reference ACI 506R, 506.2 & 506.3R. We have quite a
bit of shotcrete on tanks and retaining walls. We typically require one test
panel for each 50 yds of shotcrete. However, after review of initial panel
tests and if the same crew and mix are being used, subsequent panel testing
may be waived. The tests panels should represent the most congested
conditions in the field.  We also require nozzlemen certification per ACI
506.3R or min 3000hrs of experience. 

Eric Fieberling SE
East Bay Municipal Utility District
Oakland CA

-----Original Message-----
From: Jeff Smith [mailto:smthengr(--nospam--at)sirius.com]
Sent: Friday, August 16, 2002 7:11 AM
To: seaint(--nospam--at)seaint.org
Subject: shotcrete walls


I have a project where the contractor "informed" me that they were going to
shotcrete a retaining wall in lieu of cast in place (after the footing was
poured). I am not near my code, but as I understand it, anything with bars
greater than #5 requires that test panels are prepared. Also there are
specific requirements for spacing and non-contact lap spices.

I am only aware of a few cases where shotcrete test panels have been
prepared. I know of one project where it took the contractor 8 attempts to
get it right. This project had large congested bars.

Jeff


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