asphalt-concrete Questions with
Verified Answers
A mechanical device on an asphalt batch plant, consisting of paddles attached to
rotating shafts, for mixing aggregates and asphalt cement.
Select one:
a. Hot oil heater
b. Pug mill
c. Weigh hopper
d. Intake Hopper - ANSWERSpug mill
The top or riding surface of a pavement structure.
Select one:
a. Surface course
b. Lift (mat)
c. Leveling course
d. Binder Course - ANSWERSsurface course
The process of shaping the concrete surface to correct elevation by striking off the
excess concrete.
Select one:
a. Contraction Joints
b. Penetration Test (AASHTO)
c. Screeding
d. Breakdown - ANSWERSscreeding
Are a blend of asphalt cement and a fuel product.
Select one:
a. Hot-mix Asphalt
b. Windrow
c. Asphalt Cutbacks
d. Flexible Pavement - ANSWERSasphalt cutbacks
Where the paving machine rides on steel forms that are set to the proper line and grade
for the finished slab.
Select one:
a. Nipped
b. Breakdown
c. Formed
d. Frequency - ANSWERSformed
In concrete, the chemical reaction between cement and water. The features of this
reaction are a change in matter, in energy level, and in rate of reaction.
,Select one:
a. Hydration
b. Expansion Joints
c. Dwell Time
d. Hveem - ANSWERShydration
By remixing the asphalt concrete, reduced thermal segregation creates uniform stiffness
that allows for rougher pavement construction.
Select one:
True
False - ANSWERSfalse.
By remixing the asphalt concrete, reduced thermal segregation creates uniform stiffness
that allows for SMOOTHER pavement construction
Smaller commercial aggregate plants are the major source of crushed stone for the
construction industry in metropolitan areas.
Select one:
True
False - ANSWERSfalse.
LARGER commercial aggregate plants are the major source of crushed stone for the
construction industry in the metropolitan areas.
Properly vibrated concrete is a lower-quality concrete, in terms of strength,
reinforcement protection, resistance to aggressive agents, and overall appearance.
Select one:
True
False - ANSWERSfalse.
higher quality
Increasing roller speed increases compactive effort.
Select one:
True
False - ANSWERSfalse.
Increasing roller speed REDUCES compactive effort.
The pavement performance would not suffer if asphalt concrete is made from a
segregated stockpile.
Select one:
True
False - ANSWERSfalse.
, The pavement performance would WOULD suffer if asphalt concrete is made from a
segregated stockpile.
A batch plant mixes 15 tons of asphalt mix with an average mixing cycle of 2.5 min.
Plant efficiency is 90%. Estimate plant production in ton/hr. - ANSWERS324
2.5 min. x 60 = 150 seconds. 3600 s./150= 24. 24x15 tons= 360. 360 x .90 accuracy
=324
A specification requires a residual application rate of 0.045 gal/sy. The distributor spray
bar coverage is 8 ft. Estimate the gallons of emulsion needed for a 16 ft wide 1,200 ft
stretch of paving.
Select one:
a. 96 gallons
b. 45 gallons
c. 50 gallons
d. 33 gallons - ANSWERS96 gallons
A= 16x1200= 19200
.045/9= .005
19200x.005= 96
A concrete batch plant has a batching chamber capacity of 11 cy and an average
batching cycle time of 2 min. Plant efficiency is 80%. What is the estimated batching
production in cy/hr? - ANSWERS264.
60/2=30
30*11=330
330*.80=264
A mechanical pickup device that travels ahead of an asphalt paver and lifts windrowed
asphalt mix material into the hopper of a paver. This allows for continuous paver
operation. Windrow elevators are usually attached to the paver.
Select one:
a. Intake Hopper
b. Flights
c. Hot elevator
d. Windrow elevator - ANSWERSwindrow elevator
In this test, an asphalt sample at a temperature of 77°F, is subjected to a needle load,
with a 100-g mass and a test time of 5 sec.
Select one:
a. Job Mix Formula (JMF)
b. Revibration
c. Performance Grades of Asphalt Cements
d. Penetration Test (AASHTO) - ANSWERSpenetration test (aashto)
The transverse inclination of a road way or other surface.
Select one:
Verified Answers
A mechanical device on an asphalt batch plant, consisting of paddles attached to
rotating shafts, for mixing aggregates and asphalt cement.
Select one:
a. Hot oil heater
b. Pug mill
c. Weigh hopper
d. Intake Hopper - ANSWERSpug mill
The top or riding surface of a pavement structure.
Select one:
a. Surface course
b. Lift (mat)
c. Leveling course
d. Binder Course - ANSWERSsurface course
The process of shaping the concrete surface to correct elevation by striking off the
excess concrete.
Select one:
a. Contraction Joints
b. Penetration Test (AASHTO)
c. Screeding
d. Breakdown - ANSWERSscreeding
Are a blend of asphalt cement and a fuel product.
Select one:
a. Hot-mix Asphalt
b. Windrow
c. Asphalt Cutbacks
d. Flexible Pavement - ANSWERSasphalt cutbacks
Where the paving machine rides on steel forms that are set to the proper line and grade
for the finished slab.
Select one:
a. Nipped
b. Breakdown
c. Formed
d. Frequency - ANSWERSformed
In concrete, the chemical reaction between cement and water. The features of this
reaction are a change in matter, in energy level, and in rate of reaction.
,Select one:
a. Hydration
b. Expansion Joints
c. Dwell Time
d. Hveem - ANSWERShydration
By remixing the asphalt concrete, reduced thermal segregation creates uniform stiffness
that allows for rougher pavement construction.
Select one:
True
False - ANSWERSfalse.
By remixing the asphalt concrete, reduced thermal segregation creates uniform stiffness
that allows for SMOOTHER pavement construction
Smaller commercial aggregate plants are the major source of crushed stone for the
construction industry in metropolitan areas.
Select one:
True
False - ANSWERSfalse.
LARGER commercial aggregate plants are the major source of crushed stone for the
construction industry in the metropolitan areas.
Properly vibrated concrete is a lower-quality concrete, in terms of strength,
reinforcement protection, resistance to aggressive agents, and overall appearance.
Select one:
True
False - ANSWERSfalse.
higher quality
Increasing roller speed increases compactive effort.
Select one:
True
False - ANSWERSfalse.
Increasing roller speed REDUCES compactive effort.
The pavement performance would not suffer if asphalt concrete is made from a
segregated stockpile.
Select one:
True
False - ANSWERSfalse.
, The pavement performance would WOULD suffer if asphalt concrete is made from a
segregated stockpile.
A batch plant mixes 15 tons of asphalt mix with an average mixing cycle of 2.5 min.
Plant efficiency is 90%. Estimate plant production in ton/hr. - ANSWERS324
2.5 min. x 60 = 150 seconds. 3600 s./150= 24. 24x15 tons= 360. 360 x .90 accuracy
=324
A specification requires a residual application rate of 0.045 gal/sy. The distributor spray
bar coverage is 8 ft. Estimate the gallons of emulsion needed for a 16 ft wide 1,200 ft
stretch of paving.
Select one:
a. 96 gallons
b. 45 gallons
c. 50 gallons
d. 33 gallons - ANSWERS96 gallons
A= 16x1200= 19200
.045/9= .005
19200x.005= 96
A concrete batch plant has a batching chamber capacity of 11 cy and an average
batching cycle time of 2 min. Plant efficiency is 80%. What is the estimated batching
production in cy/hr? - ANSWERS264.
60/2=30
30*11=330
330*.80=264
A mechanical pickup device that travels ahead of an asphalt paver and lifts windrowed
asphalt mix material into the hopper of a paver. This allows for continuous paver
operation. Windrow elevators are usually attached to the paver.
Select one:
a. Intake Hopper
b. Flights
c. Hot elevator
d. Windrow elevator - ANSWERSwindrow elevator
In this test, an asphalt sample at a temperature of 77°F, is subjected to a needle load,
with a 100-g mass and a test time of 5 sec.
Select one:
a. Job Mix Formula (JMF)
b. Revibration
c. Performance Grades of Asphalt Cements
d. Penetration Test (AASHTO) - ANSWERSpenetration test (aashto)
The transverse inclination of a road way or other surface.
Select one:
