PSDC CT2 Flashcards
Precast planks have the advantages of smooth soffit finish, no _________ and rapid
assembly at site
formwork
Most precast concrete columns are_____________ conventionally.
Reinforced
The usage of L-shapes and inverted tee beams allow lower overall____________ than resting floor
and roof units on top of rectangular beams
height
The hollow-core floor slab, the voids are primarily a means of reducing______________ and reducing
concrete and steel quantities.
Weight
Which of the following is NOT a specific advantage of precasting?
Reduction of creep
Better quality control
High cost of setting up the plant
Double tees and single tees are commonly cast with a rough surface on top because:
Better bondage for concrete topping
Which of the following is FALSE about precast concrete wall panels:
Panels with openings can be prestressed.
Double-tee slab is highly functional because:
it meets structural requirements
it provides a flat useful surface
All of the options
The in-situ topping up of concrete of precast planks may vary between _________
50 to 200 mm
Joint may be accomplished by ____, bolting or post-tensioning, or by cast-in- place
concrete connections.
welding
. Circular precast columns are commonly used in construction projects.
false
Precast segments are suitable for composite construction and may be combined with castin-place concrete to act in composite action
TRUE
Prestressed beams ________
should not be lifted upside down.
It is not safe to stand directly _______ the tendons when one way stressing work is in
progress
Below
A tower crane is chosen for erecting precast prestressed components_____
whenever the lift heights are extreme
Which of the following is NOT the properties of connections between precast members:
Accommodate volume changes due to creep, shrinkage and temperature in the member, its
support and the connection assembly itself.
Transmit bearing, shear, moment, axial tension and axial compression as required by the
design.
The sequence of precast prestressed concrete components’ erection procedure are
rigging
planning
Temporary bracing is necessary to______precast members during the erection until final
connections can be made.
Support
. The erection procedure should include plans to maintain the___________ end equilibrium of the
structure during construction as well as after the structure is completed.
stability
Bearings are mostly used in prestressed concrete bridge construction to allow for the
rotations at the supports that will accompany _______of the loaded structure, in the case of
longer spans.
Deflection
. For preparation during the_____________any turning or rotation of the precast concrete until
should be done while it is on the ground or truck.
erection
The joints occur in buildings between precast concrete and cast-in-place concrete, or
between precast units, are usually caulked for_____________
watertightness
. It is necessary to move a large precast member some distance with one or more crane, the
ground over which the cranes move must be very level and____________
firm.
When hand signals are used during the erection of precast units, it must ensure that the
signals are standardized and understood by all
operators and riggers.
