Game wise, building the pavement would just be a replacement of the ground texture with something that looks like concrete or metal
Suggested properties:
1.Strong visual contrast so it's easy to see stuff;
2.Brighter than background if lit up by light at night;
3.Manufactured by assembler from stones;
4.Can pave under already placed player buildings, so the player won't have to remove a factory to fill a hole in the pavement;
5.Cannot pave under trees, over minerals, or under biter buildings, because it's illogical to do so;
Optional:
A.Player walks slightly faster while on it;
B.Causes biters to avoid the area like with other play buildings;
C.Multiple versions:
---i Standard version made from stone(Concrete Pavement),
---ii Electricity Conducting version made from metal for when you got no room for a power pole(Power Conduit),
---iii Tarmac version made from stone and heavy oil that makes cars and tanks move a lot faster
Something like pavement from Dune series:
