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Grout Problem

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irishengdave

Structural
Joined
Jan 29, 2013
Messages
28
Location
CA
Attached is a picture of a grouted baseplate. Our site rep is telling me the edges of the grout (microsil) are crumbling and have a honeycombed appearance. It can be broken up in your hand quite easily. Any ideas about what happened? I don't know if the strength has been compromised or not.
 
 http://files.engineering.com/getfile.aspx?folder=eab3f486-5c26-4c54-8046-a89c34f2d4fe&file=P9281122_(3).JPG
I don't have anything to offer regarding the cause but, among your other concerns, it also appears that the grout is not in contact with the underside of the base plate. Was a non-shrink / slightly expansive grout mix used? From what I can see of your base plate, this looks like a pretty serious application. I can see why you're concerned.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
 
Don't see any honeycomb. Looks like the grout was placed wet (bleeding under side form). Consistent with the observed shrinkage away from baseplate.

Remove and replace. No other repair works.
 
You have to assume that the strength has been compromised, along with bearing, durability, and aesthetics. It shouldn't be a huge issue to replace.
 
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