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Re: [SEAOC] MASONRY GROUT[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: Re: [SEAOC] MASONRY GROUT
- From: ctowne(--nospam--at)vt.edu (chris towne)
- Date: Fri, 16 Feb 1996 12:03:27 +0500
Jeff, Flyash tends to have a low early strength, but it should have about the same ultimate strength (90 day strength) if it doesn't exceed 20% of the total amount of cement. I hope this helps. Chris Towne ctowne(--nospam--at)vt.edu >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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