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It is not advisable to pour concrete directly on dirt. Even compacted soil—known as a subgrade—is not strong enough to maintain the form of concrete. You can, however, pour concrete over concrete as long as the overlay has proper bonding agents and the slab below is clear of damage.

Concrete slump can be affected by the amount of water in the mix, the size of the aggregate components, the mix’s temperature, how long the concrete is mixed, and more. Mixing concrete with the correct slump depends on almost every component of the concrete mix being correctly balanced and is critical to ensure the concrete performs as expected.

Generally, you shouldn’t lay artificial grass straight onto concrete. You’ll want to add some sort of underlayment that acts as a cushion. This makes it a little bit safer for children running around a pool and is recommended to prevent injury in recreational settings. It also protects that artificial grass’ backing. Just glue the grass to the underlayment using the proper adhesive.

Sealing the concrete before tiling is recommended to help it stand up against any water that may seep through the tiles or grout. After thoroughly cleaning the concrete with TSP, priming with a concrete primer will seal the concrete. Check the label on the primer to make sure it is also a sealant and follow the manufacturer’s instructions for application.