CPII Materials & Testing 4

Question 1

What does the 'W' designation in a W8x31 structural steel section describe?

Accepted Answer

Wide-flange section with approximately 8-inch depth and 31 lb/ft weight

Answer

W-shapes are wide-flange sections; W8x31 means approximately 8 inches deep and weighing 31 pounds per linear foot.

Question 2

ASTM A325 and A490 bolts are primarily used in which type of structural connections?

Accepted Answer

High-strength structural steel connections

Answer

A325 and A490 are high-strength bolts used in structural steel moment and shear connections.

Question 3

During concrete placement, what condition causes 'cold joints'?

Accepted Answer

A delay between successive concrete placements allowing the first lift to harden before the next is placed

Answer

Cold joints form when concrete in a previous lift stiffens before the next lift is placed, preventing proper bonding between layers.

Question 4

What is the purpose of performing a wash gradation (wet sieve analysis) instead of a dry sieve analysis?

Accepted Answer

To remove dust and fine particles clinging to larger aggregate particles for accurate gradation

Answer

Washing the aggregate before sieving removes dust and fine material coating particle surfaces, giving a more accurate size distribution.

Question 5

Which test measures the resistance of asphalt mixtures to permanent deformation (rutting)?

Accepted Answer

Marshall stability test

Answer

The Marshall stability test measures the load resistance of a compacted asphalt mix at 140°F, indicating rut resistance.

(CPII) Certified Public Infrastructure Inspector Practice Test