What causes the compactive effort increase? - CORRECT
ANSWER-Crushed aggregate content
Nominal maximum size
Hardness of the aggrergate
Angularity of aggregate
Less natural sand
High dust content mixes
Gradation of the mix greatly affects compaction
Superpave mixes
What kind of Performance Graded binders are there? -
CORRECT ANSWER-PG 67-22 (old AC-30)
PG 52-82
PG 58-22
PG 76-22 (PMA) Polymer modified asphalt
What are PG binders tested for high temperature wise? -
CORRECT ANSWER-A 7 day max pavement temp of 67C
What are PG binders tested for low temperature wise? -
CORRECT ANSWER--22C
Friction course has what PG binders in its makeup? -
CORRECT ANSWER-PG 76-22 (PMA)
PG 76-22 (ARB)
PG 82-22 (PMA)
Asphalt cement does what while hot? - CORRECT
ANSWER-Acts as a lubricant
Asphalt cement does what while cold? - CORRECT
ANSWER-It becomes a glue and holds the rocks together
PG 76-22 (PMA) is especially good at what? - CORRECT
ANSWER-Reducing rutting.
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What is an asphalt treated permeable base? - CORRECT
ANSWER-Concrete placed over asphalt
Friction course mixes uses a what kind of aggregate? -
CORRECT ANSWER-A polish resistant aggregate
What is a polish resistant aggregate? - CORRECT
ANSWER-Oolitic limestone (Miami-Dade County)
Granite (Georgia, Alabama, Nova Scotia)
Other Approved Sources
Asphalt generally has a minimum thickness to be laid at but
what determines how thick? - CORRECT ANSWER-The
plans developed by the designer does
What is the difference between Superpave mixes and
Friction Course mixes? - CORRECT ANSWER-Polish
resistant aggregate and special PMA or ARB binders are
used in friction course mixes.
A shoulder less than 5 ft with FC-5 can not have what? -
CORRECT ANSWER-A joint. Pave the outside of the
mainline and the shoulder at the same time.
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