Precast Concrete Flashcards
How is precast concrete made?
Cast and cured in manufacturing plant
transported
Why is formwork for precast concrete is cheaper?
Permanent, steel forms used in the plant, reducing formwork cost
Precast concrete is often ______________
Pre-tensioned
Benefits of precast?
Faster
Higher quality
Less affected by weather
Less waste
Challenges of precast?
Higher upfront cost
Less design flexibility
Transportation constraints
Definition of single tee:
Precast structural member formed in shape of T
Purpose of hollow core slabs:
More efficient use of concrete
Lighter
Service integration
Why is rebar left exposed on beams and girders?
To bond with other concrete elements
Purpose of beams and girders?
Provide support for slabs
Purpose of columns?
Provide support for beams and slabs
Why is it okay to not pre-stress columns?
Carry axial loads w/ little bending force, conventional reinforcing is enough
Benefits of ribbed wall panel:
Increased vertical span capacity
minimized weight
State steps of how precast is manufactured?
1 - Engineered
2 - Reinforcement cage manufactured
3 - Form prep & inspections
4 - Concrete placement
5 - Curing
6 - Inspection
Process of casting hollow core planks:
1 - Steel reinforcement is tensioned in casting beds
2 - Low-slump concrete is poured
3 - Once cured, cut into desired length
How long are casting beds usually?
800ft or more
