AL Hot and Cold Asphalt Plant Mix
Paving Contractor Practice Exam
Questions And Answers Rated A+ New
Update Assured Satisfaction
1. In Alabama, the term “Superpave” refers to:
A) A brand of asphalt equipment
B) A paving method using only cold mix
C) A performance-based asphalt mixture design method
D) A type of aggregate from northern Alabama
Answer: C
Explanation: Superpave (Superior Performing Asphalt Pavements) was developed by SHRP.
It is a performance-based system that specifies asphalt binders and mix designs based on
traffic and climate, not a brand or specific aggregate. Alabama DOT uses Superpave for
hot mix asphalt (HMA) specifications.
2. The optimum asphalt content in a HMA mix is determined primarily by:
A) Lowest cost per ton
B) Maximum stability without regard to voids
C) Balancing durability, stability, and voids in total mix (VTM)
D) Minimum asphalt film thickness
Answer: C
Explanation: Optimum asphalt content is the value that achieves desired volumetric
properties—typically 4% air voids, sufficient VMA (voids in mineral aggregate), and
adequate stability. Too little asphalt leads to raveling; too much leads to rutting or
bleeding.
3. In cold asphalt plant mix, the aggregate is typically dried and coated with emulsion at:
A) Temperatures above 300°F
,B) Ambient temperature or slightly warmed (below 200°F)
C) Temperatures just below the boiling point of water
D) Only after the binder is heated to 350°F
Answer: B
*Explanation: Cold mix uses emulsified asphalt (or cutback) at ambient or moderately
elevated temperatures (typically below 200°F). Unlike HMA, the aggregate is not fully
dried, and no high-temperature drying drum is required.*
4. ALDOT’s standard for HMA rutting resistance is assessed by which test?
A) Marshall Stability test
B) Hamburg Wheel Tracking Test
C) Los Angeles Abrasion test
D) Penetration test
Answer: B
Explanation: ALDOT uses the Hamburg Wheel Tracking Test to evaluate rutting and
moisture susceptibility. Marshall stability is used for volumetric design but is less predictive
of rutting. Hamburg testing is required for Superpave mixes in Alabama.
5. A plant-produced cold mix left in a stockpile for months is acceptable if:
A) It is covered with waterproof tarps
B) It contains 100% asphalt cement
C) It uses rapid-setting emulsion
D) It is never acceptable after 24 hours
Answer: A
Explanation: Cold mix can be stockpiled for extended periods if kept dry and protected.
Waterproof covers prevent emulsion breaking prematurely. Slow-setting or medium-
setting emulsions are typical for stockpile cold mix.
6. The Alabama Department of Transportation (ALDOT) specifies that HMA surface
courses must have a minimum average in-place density of:
A) 85% of theoretical maximum
B) 88% of theoretical maximum
,C) 92% of theoretical maximum
D) 98% of theoretical maximum
Answer: C
Explanation: ALDOT requires 92% of Gmm (theoretical maximum specific gravity) for
surface courses. This corresponds to about 8% air voids, ensuring durability without
excessive permeability.
7. Which test measures the resistance of HMA to fuel and oil damage?
A) Retained tensile strength ratio (TSR)
B) Boiling water test
C) Asphalt binder ignition test
D) Penetration index
Answer: A
*Explanation: TSR (Tensile Strength Ratio) measures moisture susceptibility, but it also
correlates with fuel/oil damage susceptibility when modified with anti-strip agents.
Alabama requires TSR ≥ 0.70 for most HMA mixes.*
8. In cold mix, “breaking” refers to:
A) The asphalt binder cracking due to cold weather
B) The process where water evaporates from the emulsion, leaving asphalt residue
C) The aggregate fracturing during compaction
D) The loss of volatiles in cutback asphalt
Answer: B
Explanation: Breaking is the chemical/physical process in which an asphalt emulsion
separates—water evaporates or is absorbed, and asphalt droplets coalesce into a
continuous film. Proper breaking time is critical for compaction.
9. The ALDOT-approved method for determining asphalt content in HMA is:
A) Nuclear asphalt gauge
B) Ignition oven method (AASHTO T 308)
C) Solvent extraction using trichloroethylene
D) Visual estimation
, Answer: B
Explanation: Ignition oven method is standard because it is safer, faster, and avoids
solvents. The sample is heated to burn off the asphalt, and the remaining aggregate is
weighed to calculate asphalt content.
10. For a hot mix plant in Alabama, the baghouse system is used to:
A) Heat the asphalt binder
B) Capture and recycle fine dust (filler) from exhaust gases
C) Mix cold aggregate with emulsion
D) Measure moisture content of aggregate
Answer: B
Explanation: Baghouse filters remove particulate matter from dryer exhaust, collecting
fines that can be reintroduced into the mix. This controls emissions and recovers valuable
filler material.
11. The primary aggregate property that affects adhesion of asphalt binder in Alabama’s
humid climate is:
A) Specific gravity
B) Surface texture and cleanliness
C) Soundness loss
D) Elongation index
Answer: B
Explanation: Clean, angular, and rough-textured aggregates promote better mechanical
interlocking and adhesion. Dust or clay coatings cause stripping, which is a major concern
in Alabama’s wet environment.
12. What is the typical temperature range for discharging HMA from a batch plant?
A) 100–150°F
B) 200–250°F
C) 275–325°F
D) 350–400°F
Answer: C
Paving Contractor Practice Exam
Questions And Answers Rated A+ New
Update Assured Satisfaction
1. In Alabama, the term “Superpave” refers to:
A) A brand of asphalt equipment
B) A paving method using only cold mix
C) A performance-based asphalt mixture design method
D) A type of aggregate from northern Alabama
Answer: C
Explanation: Superpave (Superior Performing Asphalt Pavements) was developed by SHRP.
It is a performance-based system that specifies asphalt binders and mix designs based on
traffic and climate, not a brand or specific aggregate. Alabama DOT uses Superpave for
hot mix asphalt (HMA) specifications.
2. The optimum asphalt content in a HMA mix is determined primarily by:
A) Lowest cost per ton
B) Maximum stability without regard to voids
C) Balancing durability, stability, and voids in total mix (VTM)
D) Minimum asphalt film thickness
Answer: C
Explanation: Optimum asphalt content is the value that achieves desired volumetric
properties—typically 4% air voids, sufficient VMA (voids in mineral aggregate), and
adequate stability. Too little asphalt leads to raveling; too much leads to rutting or
bleeding.
3. In cold asphalt plant mix, the aggregate is typically dried and coated with emulsion at:
A) Temperatures above 300°F
,B) Ambient temperature or slightly warmed (below 200°F)
C) Temperatures just below the boiling point of water
D) Only after the binder is heated to 350°F
Answer: B
*Explanation: Cold mix uses emulsified asphalt (or cutback) at ambient or moderately
elevated temperatures (typically below 200°F). Unlike HMA, the aggregate is not fully
dried, and no high-temperature drying drum is required.*
4. ALDOT’s standard for HMA rutting resistance is assessed by which test?
A) Marshall Stability test
B) Hamburg Wheel Tracking Test
C) Los Angeles Abrasion test
D) Penetration test
Answer: B
Explanation: ALDOT uses the Hamburg Wheel Tracking Test to evaluate rutting and
moisture susceptibility. Marshall stability is used for volumetric design but is less predictive
of rutting. Hamburg testing is required for Superpave mixes in Alabama.
5. A plant-produced cold mix left in a stockpile for months is acceptable if:
A) It is covered with waterproof tarps
B) It contains 100% asphalt cement
C) It uses rapid-setting emulsion
D) It is never acceptable after 24 hours
Answer: A
Explanation: Cold mix can be stockpiled for extended periods if kept dry and protected.
Waterproof covers prevent emulsion breaking prematurely. Slow-setting or medium-
setting emulsions are typical for stockpile cold mix.
6. The Alabama Department of Transportation (ALDOT) specifies that HMA surface
courses must have a minimum average in-place density of:
A) 85% of theoretical maximum
B) 88% of theoretical maximum
,C) 92% of theoretical maximum
D) 98% of theoretical maximum
Answer: C
Explanation: ALDOT requires 92% of Gmm (theoretical maximum specific gravity) for
surface courses. This corresponds to about 8% air voids, ensuring durability without
excessive permeability.
7. Which test measures the resistance of HMA to fuel and oil damage?
A) Retained tensile strength ratio (TSR)
B) Boiling water test
C) Asphalt binder ignition test
D) Penetration index
Answer: A
*Explanation: TSR (Tensile Strength Ratio) measures moisture susceptibility, but it also
correlates with fuel/oil damage susceptibility when modified with anti-strip agents.
Alabama requires TSR ≥ 0.70 for most HMA mixes.*
8. In cold mix, “breaking” refers to:
A) The asphalt binder cracking due to cold weather
B) The process where water evaporates from the emulsion, leaving asphalt residue
C) The aggregate fracturing during compaction
D) The loss of volatiles in cutback asphalt
Answer: B
Explanation: Breaking is the chemical/physical process in which an asphalt emulsion
separates—water evaporates or is absorbed, and asphalt droplets coalesce into a
continuous film. Proper breaking time is critical for compaction.
9. The ALDOT-approved method for determining asphalt content in HMA is:
A) Nuclear asphalt gauge
B) Ignition oven method (AASHTO T 308)
C) Solvent extraction using trichloroethylene
D) Visual estimation
, Answer: B
Explanation: Ignition oven method is standard because it is safer, faster, and avoids
solvents. The sample is heated to burn off the asphalt, and the remaining aggregate is
weighed to calculate asphalt content.
10. For a hot mix plant in Alabama, the baghouse system is used to:
A) Heat the asphalt binder
B) Capture and recycle fine dust (filler) from exhaust gases
C) Mix cold aggregate with emulsion
D) Measure moisture content of aggregate
Answer: B
Explanation: Baghouse filters remove particulate matter from dryer exhaust, collecting
fines that can be reintroduced into the mix. This controls emissions and recovers valuable
filler material.
11. The primary aggregate property that affects adhesion of asphalt binder in Alabama’s
humid climate is:
A) Specific gravity
B) Surface texture and cleanliness
C) Soundness loss
D) Elongation index
Answer: B
Explanation: Clean, angular, and rough-textured aggregates promote better mechanical
interlocking and adhesion. Dust or clay coatings cause stripping, which is a major concern
in Alabama’s wet environment.
12. What is the typical temperature range for discharging HMA from a batch plant?
A) 100–150°F
B) 200–250°F
C) 275–325°F
D) 350–400°F
Answer: C
