Interlocking paving stones are installed over a compacted stone sub-base and a leveling bed of sand , concrete paving stones can be used for walkways , patios , pool decks and driveways and airport or loading docks .
Interlocking paving stones are installed over a compacted stone sub-base and a leveling bed of sand . 
 Concrete paving stones can be used for walkways , patios , pool decks and driveways and airport or loading docks .