PRESTRESSED one

( Rock & Soils definition 2 )

The prestressing force in the tendon immediately. after transferring the load from the jack to the anchor head is the ________

• LOCK-OFF LOAD
• lift-off test

• Jack Length

( ACI318 construction docs & insp. 26.10.2 g )

Loss of prestress force due to unreplaced broken prestressed reinforcement shall not exceed ______ of the total prestress force in prestressed concrete members,

• 2 %

• 5%

( Rock & Soils site evaluation 6.5 )

The depth of boreholes shall be chosen to allow exploration of the bond length and at least

• 5 feet beyond

• 1ft beyond

• 3ft beyond

• 4ft beyond

( ACI318 reinforcement details 25.9.4.4.6 )

The bars shall extend at least __ in. either side of the outer edges of the device.

• 6

• 4

• 2

• 3

( Rock & Soils bar 4.2.2 ) Bars shall conform to ASTM ___ TYPE II (deformed) bars

• A722

• A720

• A723

• A721

( ASTM ) Standard Specification for Steel Strand, Uncoated Seven-Wire for Prestressed Concrete is ASTM ?

• A-416

  ^strand

• A722

  ^{high strength bar}

• A421

  ^wire

• A775

When continuously dry , the initial curing temperature of concrete placed in a precast member under plant controlled condition shall not exceed ?

Answer explanation

Precast ( CONCRETE )

4.9.5.1 (5c)

pg. 4.50

( Rock & Soils definitions ) An assembly consisting of prestressing steel, spacers, anchorage, corrosion protection, bond breakers, and centralizers.

• Tendon

• Temporary anchor

• Test Load

• Trumpet

( Rock & Soils grout tubes ) Post-grout pressures can reach up to

• 1200 psi

• 120 psi

• 100 psi

• 200 psi

(ACI318 two-way slabs 8.7.2.3 )

For prestressed slabs with uniformly distributed loads, maximum spacing S of tendons or groups of tendons in at least one direction shall be the lesser of 8h & __

• 5 feet

• 8ft

• 7ft

• 4ft