Lee, i'm with Glen, despite the adhesive being mre than capable, the concrete block itself may be prone to breaking. Concrete blocks can break at or near the surface with very little force, when drilling besser blocks often huge chunks of concrete break away at the exit point, you could well find you have an intact adhesive bond with a sliver of concrete left while the pier lays collapsed on the floor. I wouldn't be attempting to simply glue the block base without additional support.
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