NICET Highway Construction Materials Testing 1 — Questions and Answers
Question 1: Which NICET certification covers technicians who test soils, aggregates, and concrete on highway construction projects?
- Fire Alarm Systems
- Highway Construction Materials Testing (HCMT) (Correct answer)
- Water-Based Systems
- Inspection and Testing of Fire Suppression Systems
Correct answer: Highway Construction Materials Testing (HCMT)
NICET's Highway Construction Materials Testing (HCMT) certification covers technicians who perform quality assurance testing of materials used on highway projects.
Question 2: What test is used to determine the moisture-density relationship of compacted soil?
- Atterberg Limits Test
- Proctor Compaction Test (Correct answer)
- Sieve Analysis Test
- CBR Test
Correct answer: Proctor Compaction Test
The Proctor Compaction Test (AASHTO T 99 or T 180) determines the relationship between moisture content and dry density for soil compaction control.
Question 3: What does a nuclear density gauge measure on a highway construction site?
- Asphalt binder content
- In-place density and moisture content of soils and base materials (Correct answer)
- Aggregate gradation
- Concrete air content
Correct answer: In-place density and moisture content of soils and base materials
A nuclear density gauge uses gamma radiation and neutron emission to measure the in-place density and moisture content of compacted soils and base materials.
Question 4: Which AASHTO standard governs the sieve analysis of fine and coarse aggregates?
- AASHTO T 11
- AASHTO T 27 (Correct answer)
- AASHTO T 85
- AASHTO T 96
Correct answer: AASHTO T 27
AASHTO T 27 is the standard method for sieve analysis of fine and coarse aggregates used in highway construction materials testing.
Question 5: What is the purpose of the Los Angeles Abrasion Test?
- Measure aggregate moisture absorption
- Determine resistance of coarse aggregate to degradation by abrasion and impact (Correct answer)
- Test asphalt binder viscosity
- Measure compressive strength of aggregate
Correct answer: Determine resistance of coarse aggregate to degradation by abrasion and impact
The LA Abrasion Test (AASHTO T 96) measures the percentage of wear in coarse aggregate subjected to abrasion and impact in a rotating steel drum.
Question 6: In soil classification, what does the Plasticity Index (PI) indicate?
- The maximum dry density achievable
- The range of moisture content over which the soil behaves plastically (Correct answer)
- The bearing capacity of the soil
- The percentage of fine particles smaller than 0.075mm
Correct answer: The range of moisture content over which the soil behaves plastically
The Plasticity Index is the numerical difference between the Liquid Limit and Plastic Limit, representing the moisture range over which soil exhibits plastic behavior.
NICET Highway Construction Materials Testing 1
Which NICET certification covers technicians who test soils, aggregates, and concrete on highway construction projects?