To All Masonry Experts,
 
    I have a situation with a concrete slab which I  need advice on.  I have 
a 5000 PSI 6" thick slab with radiant heat piping  cast in it at the 3" 
horizon.  The slab is 30' by 48'.  I had not  gotten perimeter drainage in place or 
cut control joints in the slab before  getting a deluge of work and occupying 
the space.  Last week we had a huge  amount of rain which, I suspect, caused 
some uplift under the slab.  We  then rolled some heavy timbers on the slab 
causing considerable pulsed  vibration.  The combination caused the slab to crack 
in a random line which  is not where the control joint should be and does not 
neatly line up over the  line where the radiant heat pipes are sleeved to 
protect them from slab  movement.  My question to masonry repair experts is this: 
 Can  you recommend a low viscosity epoxy and an installation method which 
can  stabilize this crack and allow me to get the slab to crack at a cut control 
 joint?  Said crack is, essentially,  closed and simply a visible  hairline.  
There is the possibility of drilling holes along the crack to  create wells 
for a liquid and possibly apply pneumatic pressure to force a  product into the 
crack.  I think I could drill about 1 1/2" deep relatively  safely.  I would 
appreciate any expert advice out there.
 
Thanks,
 
David Dauerty
To The Line Timber Frames, Inc

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