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RE: CMU California Practice in the 1950's[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: CMU California Practice in the 1950's
- From: Harold Sprague <spraguehope(--nospam--at)hotmail.com>
- Date: Sun, 26 Apr 2009 22:04:37 +0000
The practice of solid grouting all the cells of CMU in California is variable. The practice stemmed to the studies on CMU seismic resistance done in the 1970's and 1980's time period. For whatever reason, the researchers at the time only tested walls that had each cell grouted regardless of whether or not there was vertical reinforcing in the cell. |
Code developers never made solid grouting a requirement, but it became a common practice. Many practitioners in California specify only rebar for horizontal reinforcement and solid grouted walls. The reduction in mass was not perceived as important as the added perceived continuity of a solid grouted wall. And the joint reinforcement is not considered as consequential. Again, the practice is not totally uniform in California, but it has been very common.
I performed a very unscientific survey on this list a while back and most respondents agreed that solid grouted walls in California were the norm. Once the state line was crossed, the practice of using partial grouting was more common.
It became so pervasive that many masonry contractors in California did not know to use lath or joint reinforcing for horizontal reinforcement. I recall working on a large project in Los Angeles in the late 1980's and the masonry contractor did not know how to construct a partially grouted wall. He did not know how to use the lath on the ungrouted cells, and he did not know how to install wire reinforcement in the bed joints. I gave up trying to explain it and went to solid grouting and rebar only for the horizontal reinforcement.
Anyway, that experience is what precipitated the inquiry to a project constructed in the early 1950's.
Regards, Harold Sprague
Subject: Re: CMU California Practice in the 1950's
Date: Sun, 26 Apr 2009 13:04:13 -0700
My experience is the same, I am not aware of any practice of using only solid-grouted walls, other than for the earth-retaining or fire-rated purposes.
V. Steve Gordin, SE
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