Building Engineering Construction Materials and Properties 2

Question 1

The slump test performed on fresh concrete primarily measures which property?

Accepted Answer

Workability and consistency

Answer

The slump test measures the consistency or workability of fresh concrete by recording how much a standard cone of concrete settles.

Question 2

Per ASTM C39, what is the standard age at which concrete cylinder specimens are tested for compressive strength?

Accepted Answer

28 days

Answer

ASTM C39 specifies 28 days as the standard testing age because concrete reaches approximately 99% of its design strength by then under normal curing conditions.

Question 3

The modulus of elasticity (Young's modulus) of structural steel is approximately:

Accepted Answer

29,000 ksi

Answer

The modulus of elasticity of steel is approximately 29,000 ksi (200 GPa), a constant value used in all structural steel deflection and stiffness calculations.

Question 4

Which ASTM standard governs the compressive strength testing of cylindrical concrete specimens?

Accepted Answer

ASTM C39

Answer

ASTM C39 covers the standard test method for compressive strength of cylindrical concrete specimens; C31 covers making and curing specimens.

Question 5

Reinforcing bar (rebar) in the US is designated by bar number. What does the bar number represent?

Accepted Answer

Approximate diameter in eighths of an inch

Answer

A rebar bar number equals the approximate diameter in eighths of an inch; for example, a #4 bar has a nominal diameter of 4/8 = 0.5 inches.

Building Engineering Practice Test

Building Engineering Practice Test

Building Engineering Construction Materials and Properties 2