REVIEW GUIDE - HOT MIX ASPHALT
EXAM QUESTIONS AND ANSWERS
What does first number and second number in performance graded asphalt binder
represent PG 64- 28 - Answers -First Number is hot pavement design. Second number
is cold pavement design
Consensus Properties of Aggregate - Answers -Coarse/fine Angularity, flat and
elongated particles, clay cone
Source Aggregate Properties - Answers -Toughness, soundness, and deleterious
materials
Flat/elongated particles max to min dimension ratio - Answers ->5
Determination of % Clay content for aggregate - Answers -% of material finer than 4.75
Pavement Recycling: Hot Plant recycling - Answers -Aggregate and asphalt cement
broken down to their original state and reused to make asphalt concrete
Pavement Recycling: Hot in place - Answers -Onsite recycling. One pass- combines
restored pavements with virgin materials. Two-pass restored materials is compacted
and new wearing surface follows on top.
Pavement Recycling: Cold Planning - Answers -Controlled milling of the surface of
pavement
Affects of aggregate angularity - Answers -ensures friction and rutting resistance
Rigid Stress - Answers -Stress distributed evenly over larger area of road pavement
Flexible Stress - Answers -Stress distributed over small area and shaped like bell curve
under load
EXAM QUESTIONS AND ANSWERS
What does first number and second number in performance graded asphalt binder
represent PG 64- 28 - Answers -First Number is hot pavement design. Second number
is cold pavement design
Consensus Properties of Aggregate - Answers -Coarse/fine Angularity, flat and
elongated particles, clay cone
Source Aggregate Properties - Answers -Toughness, soundness, and deleterious
materials
Flat/elongated particles max to min dimension ratio - Answers ->5
Determination of % Clay content for aggregate - Answers -% of material finer than 4.75
Pavement Recycling: Hot Plant recycling - Answers -Aggregate and asphalt cement
broken down to their original state and reused to make asphalt concrete
Pavement Recycling: Hot in place - Answers -Onsite recycling. One pass- combines
restored pavements with virgin materials. Two-pass restored materials is compacted
and new wearing surface follows on top.
Pavement Recycling: Cold Planning - Answers -Controlled milling of the surface of
pavement
Affects of aggregate angularity - Answers -ensures friction and rutting resistance
Rigid Stress - Answers -Stress distributed evenly over larger area of road pavement
Flexible Stress - Answers -Stress distributed over small area and shaped like bell curve
under load
