NETTCP Material Specifications 3

Question 1

In New England state DOT specifications, what is the maximum sodium sulfate soundness loss typically permitted for coarse aggregate used in pavement surface courses?

Accepted Answer

12%

Answer

Most New England DOT specifications limit sodium sulfate soundness loss to 12% for coarse aggregate in pavement surface courses to ensure freeze-thaw durability.

Question 2

Which ASTM designation governs the specification for deformed and plain steel bars for concrete reinforcement (rebar)?

Accepted Answer

ASTM A615

Answer

ASTM A615 is the standard specification for deformed and plain carbon-steel bars used as concrete reinforcement.

Question 3

For corrugated metal pipe (CMP) used in drainage culverts, what property is specified by AASHTO M 36?

Accepted Answer

Corrugated steel pipe dimensions, coating, and wall thickness

Answer

AASHTO M 36 specifies the dimensions, wall thickness, corrugation profile, and coating requirements for corrugated steel pipe.

Question 4

What is the minimum California Bearing Ratio (CBR) typically required for subbase material per AASHTO specifications?

Accepted Answer

20%

Answer

AASHTO typically requires a minimum CBR of 20% for granular subbase material to provide adequate support for the pavement structure.

Question 5

Epoxy-coated reinforcing bars used in bridge decks must meet which ASTM specification?

Accepted Answer

ASTM A775

Answer

ASTM A775 covers epoxy-coated steel reinforcing bars where the coating is applied after fabrication of the bar.

(NETTCP) New England Transportation Technician Certification Program Practice Test

(NETTCP) New England Transportation Technician Certification Program Practice Test

NETTCP Material Specifications 3