1) Concrete type 2) Formed 3) Formed off-site 4) Like plant-made concrete 5) Like some concrete 6) Like some concrete slabs 7) Mold beforehand 8) Molded beforehand 
Concrete building components which are formed and cured at a factory and then transported to a work site for erection. 
Having received its final form before introduction into a structure, as in precast concrete slabs.
[adj] - of structural members especially of concrete
Concrete shapes made separately before being used in a structure.
adjective of structural members especially of concrete; cast into form before being transported to the site of installation
A concrete unit, structure or member that is cast and cured in an area other than its final position or place.