From: "Brian K. Smith" <smitheng(--nospam--at)dos.net>
Date: Fri, 25 Feb 2000 09:41:43 -0600
I have a project currently under construction in which we have low grout
strength. I specified a grout strength of 3000 psi; however, we are getting
28 day strengths just over 2000 psi. One break had a 28-day strength of
1970 psi which is lower than the 2000 psi minimum specified by UBC. Masonry
prisms were specified, however, I have not seen the results. Even if I
surpass the f'm=2000 psi specified, I still do not meet the UBC minimum.
The problem is, as always, the wall is partially in place. I would like to
determine what strength we actually have before the wall is completed. The
wall is partially grouted, 32"oc. However, I specified the bottom 4' of
wall to be grouted solid. Can I core this section of wall, and then run a
compressive test on the core? Do they need to saw off the face shells prior
to the test?
Any help will be appreciated.
Brian K. Smith, P.E.