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Re: Silicone sealant (caulk)

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First of all, thanks for the great article, read it and saved for future use. 
It also was good to know that Washington DC not only has politicians, but some talented engineers, too (in case somebody is about to get offended - just kidding). 
Congratulations on your very impressive qualifications.  An expert in post-tensioning... I can understand your recent posts much better now. 
As far as the joints are concerned - polyurethane it is. 
Thanks again.
----- Original Message -----
Sent: Tuesday, November 09, 2004 2:37 PM
Subject: Re: Silicone sealant (caulk)

In a message dated 11/9/2004 5:02:59 PM Eastern Standard Time, mailbox(--nospam--at) writes:
I was under impression that silicone-based fillers are quite inert.  Oh well.
Now, how to distinguish between the acid-curing and "concrete-friendly" silicone compounds? 
What kind of filler material for residential or commercial concrete slabs would you recommend
Actually, most (if not all) of the new high movement (100/50) caulks are silicones.
If it is acid cured, it will probably say something like "not recommended for porous substrates", it should also say it is recommended for copper, etc.
A two-part polyurethane sealant works in about 95% of the typical concrete slab applications.  
But the material is not the only concern - things like the age of the concrete,  temperature cycles, etc., are important.
Gail Kelley