NETTCP Field Testing 5

Question 1

A field technician is conducting a straight-edge test on a newly paved asphalt surface. A 10-foot (3 m) straightedge is placed parallel to the centerline. The maximum allowable deviation under the straightedge per most New England DOT specs is:

Accepted Answer

1/4 inch (6 mm)

Answer

Most New England DOT specifications allow a maximum deviation of 1/4 inch (6 mm) under a 10-foot straightedge for finished asphalt surfaces.

Question 2

During culvert installation inspection, a field technician finds that the bedding material under a corrugated metal pipe does not extend the full pipe width. This deficiency will most likely cause:

Accepted Answer

Differential settlement and uneven load distribution

Answer

Inadequate bedding support creates uneven load transfer, leading to differential settlement, pipe distortion, and potential failure over time.

Question 3

What field test is used to evaluate the surface friction characteristics of a wet pavement using a locked-wheel trailer?

Accepted Answer

Skid Resistance Test (ASTM E274)

Answer

ASTM E274 uses a locked-wheel skid trailer towed at 40 mph on a wetted pavement to measure the friction number as a Skid Number (SN).

Question 4

A technician is sampling aggregate from a stockpile for gradation testing. To obtain a representative sample, the technician should:

Accepted Answer

Collect multiple increments from various locations and depths, then quarter down

Answer

Stockpiles segregate by particle size during placement; collecting multiple increments from varied locations and reducing by quartering gives a representative sample.

Question 5

During a field inspection of reinforcing steel placement, a technician measures 2-inch (50 mm) clear cover where the plan requires 3 inches (75 mm). The appropriate action is:

Accepted Answer

Document the nonconformance and require the contractor to correct before concrete placement

Answer

Inadequate rebar cover reduces corrosion protection and must be corrected before concrete is placed, as the deficiency cannot be remedied afterward.

(NETTCP) New England Transportation Technician Certification Program Practice Test

(NETTCP) New England Transportation Technician Certification Program Practice Test

NETTCP Field Testing 5