solid
bare
a floor made of bare concrete

fresh, wet
precast, ready-mixed
reinforced

layer, slab

mix
lay, pour
be made from/of/out of
set sth in
The pathway is formed from large pebbles set in concrete.
I do not regard this plan as set in concrete. (figurative)

set
Before the concrete sets the surface can be given a final smoothing over.

block, slab
building, floor, wall
jungle

Concrete is used with these nouns:
detail, evidence, example, expression, fact, idea, manifestation, noun, proof, proposal, result, situation, step, suggestion, term, word