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Re: [SEAOC] MASONRY GROUT[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org, SEAOC(--nospam--at)seaoc.org
- Subject: Re: [SEAOC] MASONRY GROUT
- From: David Owens <dtowens(--nospam--at)cogent.net>
- Date: Fri, 16 Feb 1996 20:47:03 -0800
What about the special inspection? It would have been prudent to have prisms taken before construction began. Also, only Portland cement should be used for grout, not pozzolans. At 07:05 AM 2/16/96 -0800, JEFF SPENCE wrote: >Looking for information to a construction problem located in Northern >California regarding masonry walls... specifically grout. I have designed >18' tall masonry walls. Supported @ the top, f'm=1500 psi, special >inspections, 8" thick. Temperatures have been cool but not cold. Recent >grout tests are showing a low compressive break. 500 psi @ 7 days and 1400 >psi @ 28 days. 1991 UBC code requires 2000 psi minimum. After some >investigation, I found the mix design calls for 5,000 lbs. of type F >fly-ash. Is this even possible??? The total numbers add up to 12 yds in a >9 yd truck. Core samples have also been taken resulting in a 1750 psi >average strength. Since this flyash has been noticed, different grout >supplier has been selected. Using the same design without the flyash... his >7 day breaks have been around 1800 psi. > The only place I can find reference to masonry grout cores is title >24 of the UBC which is not in effect for this building. > Question.... What short-term/long-term effects will fly-ash have on >grout? What other references are available regarding masonry grout cores? >Currently the building official is leaning towards tearing down 3,000 sq. >ft. of wall and maybe an additional 20,000 sq. ft. more. Any suggestions or >help would be appreciated. > > Thanks !! > > Jeff Spence, PE > Spencej(--nospam--at)mako.com > >... ******* ******* ******* ******* >* This email was sent to you via Structural Engineers Association of California >* (SEAOC) email server. To subscribe (no fee) to the list, send email to >* seaoc-request(--nospam--at)seaoc.org and in the body of the message type subscribe. >* To Unsubscribe, send email to seaoc-request(--nospam--at)seaoc.org and in the body of the >* message type Unsubscribe. You can type anything you like in the subject field. >* For questions, send email to seaoc-ad(--nospam--at)seaoc.org. >* Make sure you visit our web site at: >* http://www.seaoc.org/seaoc ****** ***** ******* ******* > > ...
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