Precast Concrete
CSI Division 03, Concrete
Concrete elements, such as structural panels, beams, and architectural facade pieces, cast and cured in a controlled plant environment, then transported to the jobsite and erected into place, rather than being poured in their final position (called cast-in-place concrete).
Why it matters
Because precast elements cure under controlled plant conditions rather than variable jobsite weather, they typically achieve more consistent quality and can be manufactured while site work happens in parallel, but that same benefit means precast pieces have to be precisely coordinated and detailed well in advance, since a plant can't easily improvise a fix the way a jobsite crew might.
On a real project
A parking structure uses precast concrete beams and deck panels manufactured off-site and delivered on trucks, erected by a crane crew in a fraction of the time a cast-in-place structure of the same size would take to form, pour, and cure on site.
Who this matters most to
An Ironworker connects and welds precast elements into place once they're set by crane. A Project Engineer manages the shop drawing coordination process with the precast manufacturer well in advance of erection, since a dimensional error caught after the pieces are cast is far more expensive to fix than one caught during design review.
Where this goes wrong
A project team finalizes precast panel shop drawings without double-checking a dimension against a recent field change to the adjacent cast-in-place structure. The precast pieces arrive from the plant and don't fit the opening as built, forcing an expensive, schedule-killing rework of pieces that can't simply be re-poured on site.