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RE: Joints in retaining walls

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Almost as good is to see a crack start at the top of a wall in a control joint then move at a diagonal several inches from the joint and continue down the wall parallel to the joint.  Try explaining that to a client without using the words "I do not know why."
Acie Chance
-----Original Message-----
From: Rhkratzse(--nospam--at) [mailto:Rhkratzse(--nospam--at)]
Sent: Wednesday, March 22, 2006 7:55 AM
To: kspeoples(--nospam--at); seaint(--nospam--at)
Subject: Re: Joints in retaining walls

Most interesting is to see a nice joint -- with a crack several inches away and parallel to it!  In slab or wall.  Kind of makes me wonder how deep the joint is; perhaps it's just cosmetic.


In a message dated 3/22/06 4:37:50 AM, kspeoples(--nospam--at) writes:

I too have seen similar cracks at inserts - even at walls with joints.  I have often wondered whether it would be better to require core drilling for the railing posts and force the shrinkage to occur more at the joints. 
Best regards,

Kenneth S. Peoples, P. E.
Lehigh Valley Technical Associates, Inc.
1584 Weaversville Road
Northampton, PA 18067
Phone: 610-262-6345
Fax: 610-262-8188

----- Original Message -----
From: Rhkratzse(--nospam--at)
To: gloomis(--nospam--at) ; seaint(--nospam--at)
Sent: Tuesday, March 21, 2006 4:50 PM
Subject: Re: Joints in retaining walls

FWIW I once saw a cast concrete site retaining wall (i.e. not a building wall) somewhere in California, about 6' or 7' tall, with a fine, full-height vertical crack every 10', aligned with the inserts for a metal railing.  Not a "real" joint in sight!


In a message dated 3/21/06 1:41:03 PM,
gloomis(--nospam--at) writes:

CRSI Design Handbook - Working Stress Design 1963 recommends contraction
joints at about 25' and expansion joints at every 4th joint - 100'.  The
newer CRSI 1996 states the same recommendations and also references
Figure 14-5 which is based on ACI 350.

Gary Loomis