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Masonry Code ACI 530-05 ----CMU California Practice in the 1950's[Subject Prev][Subject Next][Thread Prev][Thread Next]
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- Subject: Masonry Code ACI 530-05 ----CMU California Practice in the 1950's
- From: "Acharya, Suresh" <Suresh.Acharya(--nospam--at)ci.concord.ca.us>
- Date: Tue, 5 May 2009 08:58:49 -0700
- Cc: <spraguehope(--nospam--at)hotmail.com>
ACI 530-05 section 220.127.116.11.1.3 says " Reinforcement shall extend beyond the point at which it is no longer required to resist flexure for a distance equal to the effective depth of the member or 12db, whichever is greater, except...."
The next section 18.104.22.168.1.4 seem to be requiring an extension of a distance ld in place of effective depth or 12db. This section seems reasonable, not the previous one.
What is the intentions of the code writer here?
-Suresh Acharya, S.E.
From: Harold Sprague [mailto:spraguehope(--nospam--at)hotmail.com]
Sent: Tuesday, May 05, 2009 7:21 AM
Subject: RE: CMU California Practice in the 1950's
I will verify whether or not the cells are filled in the field.
Regards, Harold Sprague
Subject: Re: CMU California Practice in the 1950's
Date: Thu, 30 Apr 2009 07:42:51 -0700
Sorry if this is repetetively redundant by now--tried to send on Monday, but was having list issues. Have not seen other comments on "sounding" CMU walls to find un-grouted vs. grouted cells.
You can tell by "sounding" the wall which cells are grouted. Tap the wall with a hammer--the grouted cells sound very different than the ungrouted ones. Note: If you're not on site, this method doesn't help you much....
I inspected a CMU addition in Lompoc built in the 50s or 60s and it was only grouted where the reinforcing was.
One reason solid-grouting became common is that it's less labor-intensive than blocking off the cells below your horizontal reinforcement--plus you can do high-lift grouting instead of having to grout every horizontal rebar course before continuing to lay block. If you're using ready-mix trucks, you only bring them in once for grouting when the wall is topped out.
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