new concrete over old?

Old 06-09-06, 12:47 PM
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new concrete over old?

My old driveway is not level and I never use it. It runs next to the side of the house and I'm thinking about pouring a concrete terraced patio (5 "steps," each "step" about 9' x 9') over it without removing the old concrete. Can I do this? Do need to brush the old concrete with some sort of bonding agent? Do I need to lay a sand and gravel base?
Old 06-09-06, 06:03 PM
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You can do it in 2 different ways.

You can float your new concrete over the old, which is what you would want to do if the driveway is cracked (non-moving cracks), in which case you would use a bond breaker between the slabs.

Or, you can bond the new to the old if it is in good shape. Clean it well, apply a bonding agent to the surface and proceed.

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