How to re-attach slate pieces to concrete walkway

[eakle]

I have an attractive walkway outside my house which has a concrete base or foundation, and has large pieces of slate (1 to 2" thick) embedded in the concrete (grouted between each piece of slate).  So the pieces of slate are like stepping stones.  I would guess that the walkway is about 20 years old.  Over the years some of the pieces of slate have detached from the concrete and I would like to find a good way to re-attach them.  The concrete base appears to be in good shape.  I'm looking for a product recommendation (e.g. glue or epoxy) that would be good for re-attaching these pieces of slate to the concrete walkway base.

[Forum Administrator]

Eakle,

I would use a Knife-grade Epoxy like the Rivo 50 -
http://www.defusco.com/rivo-knife-grade-epoxy-p-1427.html

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