Existing surface preparation to receive new topping
Existing surface preparation to receive new topping
(OP)
The contractor has removed a 1½" thick bonded concrete topping from the top of a 50 year old concrete waffle slab floor (2½" thick slab on ribs at 24" centres each way). Some of it was well bonded but much of it was not. The top of the old waffle slab is rough. The contractor wants to place the new topping on top of the old waffle slab with a proprietary water based epoxy bonding agent with a 24 hour open life, but no surface preparation. Is that ok? Shouldn't it be shotblast? What surface preparation should be used?






RE: Existing surface preparation to receive new topping
RE: Existing surface preparation to receive new topping
RE: Existing surface preparation to receive new topping
Document their recommendation and give it to the contractor. It might come in handy if there is a warranty claim.
RE: Existing surface preparation to receive new topping
RE: Existing surface preparation to receive new topping
To Ingenuity: a very good idea. Thanks.