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You can dry pour concrete over existing concrete, but it’s best to use wet pour concrete instead. Dry pour concrete is easier to apply, but in order for new concrete to adhere to old concrete, it needs the right mixture for slow, uniform curing. Additionally, dry pour concrete is less durable and less resistant to cracking and concrete sinking, so dry pouring over an existing slab may result in surface imperfections appearing prematurely.

Asphalt and concrete have their pros and cons, but it really depends on your priorities. If you’re looking for durability, concrete’s your best bet, lasting up to 50 years with minimal upkeep. Asphalt, on the other hand, needs more TLC with regular resealing but is cheaper to install and easier to repair. Concrete also wins in curb appeal and resale value, offering homeowners more customization. But if you’re looking for quicker, more affordable installation, asphalt has the advantage. Ultimately, your decision should align with your budget, willingness for maintenance, and design preferences.

To remove solvent-based sealer, you can pressure wash the surface and wait for the concrete to dry. You may need a special remover product if you have a water-based concrete sealer. Another option is to etch and neutralize the concrete. 

Concrete can take up to 28 days to completely harden, depending on the type and its water content. But it dries enough for foot traffic in 24 to 48 hours. If you're curious about how long it takes concrete to dry entirely, the answer is more complex, so always check with the specific mixture instructions before adding heavy machinery or driving on new concrete.