TEXAS HIGHWAY CONSTRUCTION
TECHNICIAN CERTIFICATION EXAM WITH
ACTUAL QUESTIONS AND VERIFIED
ANSWERS, PLUS EXPLAINED
RATIONALES/EXPERT VERIFIED FOR
GUARANTEED 100% PASS 2026/LATEST
UPDATE/INSTANT DOWNLOAD PDF
1. A highway construction technician is verifying that the subgrade
meets project requirements before placing the base course. Which
test provides the most direct measurement of the soil's in-place
density?
A. Atterberg Limits Test
B. Sand Cone Density Test
C. Sieve Analysis
D. Hydrometer Test
Answer: B. Sand Cone Density Test
Rationale: The Sand Cone Density Test determines the in-place density
of compacted soil and compares it with laboratory maximum dry density
to determine the percentage of compaction achieved. Atterberg Limits
determine soil plasticity, sieve analysis measures particle size
distribution, and the hydrometer test evaluates fine-grained soil
particles.
2. Which specification primarily governs the quality of aggregate
used in Texas highway base construction?
A. Aggregate color
B. Gradation, durability, and cleanliness
1
,C. Moisture only
D. Particle shape only
Answer: B. Gradation, durability, and cleanliness
Rationale: Highway aggregates must meet requirements for particle size
distribution, resistance to wear, soundness, and freedom from
deleterious materials. These characteristics ensure adequate structural
performance under traffic loading.
3. During embankment construction, why is moisture conditioning
performed before compaction?
A. To increase soil temperature
B. To achieve optimum moisture content
C. To reduce aggregate size
D. To increase cement content
Answer: B. To achieve optimum moisture content
Rationale: Compaction efficiency is highest when soil is compacted near
its optimum moisture content as determined by the Proctor test. Too
much or too little moisture results in reduced density and poor long-term
performance.
4. Which laboratory test determines the optimum moisture content
and maximum dry density of soil?
A. Los Angeles Abrasion Test
B. Modified Proctor Test
C. Slump Test
D. Flow Table Test
Answer: B. Modified Proctor Test
2
,Rationale: The Modified Proctor Test establishes the moisture-density
relationship for soils and determines the optimum moisture content and
maximum dry density used as the basis for field compaction
requirements.
5. A highway pavement begins showing longitudinal cracking shortly
after construction. Which is the most likely cause?
A. Excessive lane width
B. Poor compaction or reflective cracking
C. Proper joint spacing
D. Excessive pavement markings
Answer: B. Poor compaction or reflective cracking
Rationale: Longitudinal cracks commonly develop because of
inadequate compaction, weak joints between paving lanes, or cracks
reflecting upward from underlying pavement layers.
6. Which instrument is commonly used to determine pavement
smoothness during construction?
A. Nuclear Density Gauge
B. Profilograph
C. Schmidt Hammer
D. Penetrometer
Answer: B. Profilograph
Rationale: A profilograph measures pavement profile and identifies
surface irregularities affecting ride quality. Smoothness is an important
acceptance criterion for highway pavements.
3
, 7. In hot mix asphalt production, what is the primary purpose of
heating the aggregate?
A. Increase aggregate hardness
B. Remove moisture for proper asphalt coating
C. Change aggregate color
D. Improve cement hydration
Answer: B. Remove moisture for proper asphalt coating
Rationale: Dry aggregate allows asphalt binder to coat particles
effectively, improving pavement durability and preventing stripping.
8. What is the primary purpose of tack coat between asphalt layers?
A. Waterproofing
B. Bonding adjacent asphalt layers
C. Increasing pavement thickness
D. Cooling the pavement
Answer: B. Bonding adjacent asphalt layers
Rationale: Tack coat creates adhesion between asphalt lifts, allowing
the pavement structure to behave as a single unit under traffic.
9. Which traffic control device provides the highest level of worker
protection in a highway work zone?
A. Traffic cones
B. Portable barricades
C. Temporary concrete barrier
D. Flagging paddle
Answer: C. Temporary concrete barrier
4
TECHNICIAN CERTIFICATION EXAM WITH
ACTUAL QUESTIONS AND VERIFIED
ANSWERS, PLUS EXPLAINED
RATIONALES/EXPERT VERIFIED FOR
GUARANTEED 100% PASS 2026/LATEST
UPDATE/INSTANT DOWNLOAD PDF
1. A highway construction technician is verifying that the subgrade
meets project requirements before placing the base course. Which
test provides the most direct measurement of the soil's in-place
density?
A. Atterberg Limits Test
B. Sand Cone Density Test
C. Sieve Analysis
D. Hydrometer Test
Answer: B. Sand Cone Density Test
Rationale: The Sand Cone Density Test determines the in-place density
of compacted soil and compares it with laboratory maximum dry density
to determine the percentage of compaction achieved. Atterberg Limits
determine soil plasticity, sieve analysis measures particle size
distribution, and the hydrometer test evaluates fine-grained soil
particles.
2. Which specification primarily governs the quality of aggregate
used in Texas highway base construction?
A. Aggregate color
B. Gradation, durability, and cleanliness
1
,C. Moisture only
D. Particle shape only
Answer: B. Gradation, durability, and cleanliness
Rationale: Highway aggregates must meet requirements for particle size
distribution, resistance to wear, soundness, and freedom from
deleterious materials. These characteristics ensure adequate structural
performance under traffic loading.
3. During embankment construction, why is moisture conditioning
performed before compaction?
A. To increase soil temperature
B. To achieve optimum moisture content
C. To reduce aggregate size
D. To increase cement content
Answer: B. To achieve optimum moisture content
Rationale: Compaction efficiency is highest when soil is compacted near
its optimum moisture content as determined by the Proctor test. Too
much or too little moisture results in reduced density and poor long-term
performance.
4. Which laboratory test determines the optimum moisture content
and maximum dry density of soil?
A. Los Angeles Abrasion Test
B. Modified Proctor Test
C. Slump Test
D. Flow Table Test
Answer: B. Modified Proctor Test
2
,Rationale: The Modified Proctor Test establishes the moisture-density
relationship for soils and determines the optimum moisture content and
maximum dry density used as the basis for field compaction
requirements.
5. A highway pavement begins showing longitudinal cracking shortly
after construction. Which is the most likely cause?
A. Excessive lane width
B. Poor compaction or reflective cracking
C. Proper joint spacing
D. Excessive pavement markings
Answer: B. Poor compaction or reflective cracking
Rationale: Longitudinal cracks commonly develop because of
inadequate compaction, weak joints between paving lanes, or cracks
reflecting upward from underlying pavement layers.
6. Which instrument is commonly used to determine pavement
smoothness during construction?
A. Nuclear Density Gauge
B. Profilograph
C. Schmidt Hammer
D. Penetrometer
Answer: B. Profilograph
Rationale: A profilograph measures pavement profile and identifies
surface irregularities affecting ride quality. Smoothness is an important
acceptance criterion for highway pavements.
3
, 7. In hot mix asphalt production, what is the primary purpose of
heating the aggregate?
A. Increase aggregate hardness
B. Remove moisture for proper asphalt coating
C. Change aggregate color
D. Improve cement hydration
Answer: B. Remove moisture for proper asphalt coating
Rationale: Dry aggregate allows asphalt binder to coat particles
effectively, improving pavement durability and preventing stripping.
8. What is the primary purpose of tack coat between asphalt layers?
A. Waterproofing
B. Bonding adjacent asphalt layers
C. Increasing pavement thickness
D. Cooling the pavement
Answer: B. Bonding adjacent asphalt layers
Rationale: Tack coat creates adhesion between asphalt lifts, allowing
the pavement structure to behave as a single unit under traffic.
9. Which traffic control device provides the highest level of worker
protection in a highway work zone?
A. Traffic cones
B. Portable barricades
C. Temporary concrete barrier
D. Flagging paddle
Answer: C. Temporary concrete barrier
4
