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