B)Prestressed Concrete HW(IBC-318)

What is the minimum concrete coverage for tendons in a 5-1/2 in. thick slab exposed to weather?

• 1 in.

• 2 inches

• 1-1/2 inches

• 3 inches

Answer explanation

ACI 318-14 20.6.1.3.2

ACI 318-19 20.5.1.3.2

Ducts for grouted single strand tendons shall have an inside diameter at least _____ larger than the tendon diameter.

• 1/4 in.

• 1/2 INCH

• 1/8 INCH

• 3/8 INCH

Answer explanation

ACI 318-14 20.6.4.3

ACI 318-19 20.5.4.3

Prestressing reinforcement for single strand tendons shall not be tensioned until concrete compressive strength is at least _______

• 2500^psi

• 3000psi

• 2000psi

• 5000psi

Answer explanation

ACI 318

26.10.2 J

Anchorage & couplers for tendons shall develop at least _____ when tested in an unbounded condition

• 95 f_pu

• 80 f_pu

• 85 f_pu

• 75 f_pu

Answer explanation

ACI 318

25.8.1

In a TWO-WAY slab PT slab, at least __ _1/2 in. dia. Tendons shall be placed in each direction in the slab over a column.

• TWO

• 1

• 3

• 4

Answer explanation

ACI 318

8.7.5.6.1

Prestressed reinforcement to resist shrinkage & temperature stresses shall provide a minimum effective prestress after losses of at least _____

• 100^psi

• 1000psi

• 150psi

• 200psi

Answer explanation

ACI 318

24.4.4.1

What are six things taken in to consideration when determining loss of prestress?

• ACI 318

  20.3.2.6.1

• IBC

  Table

  1808.8

• ACI 318

  26.10.2

• ACI 318

  26.10.2

Answer explanation

ACI 318

20.3.2.6.1

What is the maximum spacing of uniform tendons in an 8 in. thick slab?

• 5 ft

• 4'

• 3'

• 6'

Answer explanation

ACI 318

8.7.2.3

Prestressing strands, wires & bars not listed in ASTM A416, A421 or A722 are permitted provided

• They conform to the minimum requirements of these specifications

• the iron worker can fit jack over strands

• superintendent is ok with using them

• tendons are metal

Answer explanation

ACI 318

20.3.1.2

Ducts for grouted multiple strand tendons shall have an inside cress sectional area at least ___ times the area of the prestressing steel.

• TWO

• 3

• 4

• 1.5

Answer explanation

ACI 318-14 20.6.4.4

ACI 318-19 20.5.4.4