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Yes, you can pour new concrete over old concrete, but you need to apply a concrete bonding agent to the existing concrete to ensure the new concrete sticks. Keep in mind that even with a bonding agent, large cracks and other flaws will still come through. If the concrete has heaved, settled, or cracked, pouring new concrete on top won’t address any root structural problems. Removing the existing concrete and rebuilding will be your best solution in that case.

If you're planning to lay new concrete over an old demolition site, reinforcements may be a good idea for larger builds, such as patios, decks, and concrete slabs. Concrete that exceeds 6 inches of thickness is often reinforced. It will cost more to lay but will give your new structure a solid foundation.

In terms of durability, concrete driveways can last more than 50 years when properly maintained, compared to the typical 30 years for an asphalt driveway. However, the durability depends on the climate, base material and thickness, and thickness of the concrete or asphalt used. The longevity of concrete or asphalt driveways also depends on how well it’s maintained and the amount of wear and tear it endures.

When comparing fence post foam versus concrete, concrete is considered more durable and stronger. Concrete is a stronger material that can handle larger amounts of weight, making it a good choice for load-bearing posts. For posts on smaller fences or fences made with lighter materials, like vinyl or wire mesh, post foam is a good choice.