NICET LEVEL 2: ASPHALT WITH
COMPLETE SOLUTIONS
How many samples are required to create a composite sample? - ANSWER-3 samples
When core sampling, where should nuclear density gauge test be taken? - ANSWER-
Test should be taken prior to coring in same location
What is a "Lot" comprised of? - ANSWER-A lot is split up in 5 different samples called
"Sublots"
When sampling from a paver auger, where should the sample be taken? - ANSWER-
Sample should be taken from the end of the auger
When sampling from roadway, where should sample be taken? - ANSWER-Immediately
behind paver and Infront of breakdown roller
When sampling from roadway, how far away should rollers stay away? - ANSWER-
Rollers should be 10' away from sampling area
When sampling from the roadway, what're the type of sampling methods? - ANSWER-
Plate with cookie cutter, Plate method, non-plate method
What is the requirement when using plate method for sampling from roadway? -
ANSWER-1. Plate is placed 10' Infront of paver and at least 2' on the inside edge of the
mat
2. 3 samples must be acquired
What are the requirements when sampling from a paver? - ANSWER-1. Trim 8-12"
before taking sample
2. Remove 6-10" of material in center of hopper
3. Take sample directly into vertical face
What are the requirements for sampling from stockpiles? - ANSWER-1. Remove 4" of
outermost layer
2. Obtain sample as close as possible to the intersection of horizontal and vertical face.
How many sections should be split from a sample container when " sample splitting"? -
ANSWER-4
What are the requirements for sampling from a loaded truck? - ANSWER-1. Truck
should be split into 4 different quadrants
2. Remove 4" of outermost layer
, 3. 3 increments placed on sample container
What is open-graded Asphalt? - ANSWER-Top course permeable layer that supports
drainage, tire dampening and road spray
What is dense-graded Asphalt? - ANSWER-Base or binder course that have larger
nominal size aggregates. Low water impermeability, strength and improves freeze/thaw
cycles
Existing surface preparation inspection: Structurally Sound - ANSWER-Cracks and
other structural defects must be prepared to minimize reflective cracking. surface must
be non-compressible and capable of bearing traffic loads
Existing surface preparation: Well Drained - ANSWER-1. Surface must not be
undermined by water intrusion.
2. Water should not collect around roadbed
3. Roadbed should promote positive drainage
Existing Surface Preparation: Properly Graded - ANSWER-Elevation prepared to proper
slope and crown
When is paving on subgrade not recommended? - ANSWER-When optimum moisture
content is over 4% or area is frozen
What is the required compaction rating? - ANSWER-95% compaction
What can be done is soil conditions are to dry when compacting? - ANSWER-Water can
be applied, but must be closely monitored
What equipment is recommended for sandy/granular soil conditions? - ANSWER-
Vibratory rollers/ compactors
What equipment is recommended for silt/clay soil conditions? - ANSWER-Tamping Foot
Rollers
What is another method to test soil compaction besides nuclear density gauge? -
ANSWER-Proof Rolling: Method of utilizing a loaded truck and measuring indentations.
Soils that exhibit proper compaction should reveal 1/8" indentation. Poorly compacted
areas reveal more than a 1/8"
What equipment should be utilized around drainage structures, tight spaces or turns to
achieve compaction? - ANSWER-Hand tamps or plate tampers
What type of amplitude compaction is recommended for crushed stone bases? -
ANSWER-High to low frequencies
COMPLETE SOLUTIONS
How many samples are required to create a composite sample? - ANSWER-3 samples
When core sampling, where should nuclear density gauge test be taken? - ANSWER-
Test should be taken prior to coring in same location
What is a "Lot" comprised of? - ANSWER-A lot is split up in 5 different samples called
"Sublots"
When sampling from a paver auger, where should the sample be taken? - ANSWER-
Sample should be taken from the end of the auger
When sampling from roadway, where should sample be taken? - ANSWER-Immediately
behind paver and Infront of breakdown roller
When sampling from roadway, how far away should rollers stay away? - ANSWER-
Rollers should be 10' away from sampling area
When sampling from the roadway, what're the type of sampling methods? - ANSWER-
Plate with cookie cutter, Plate method, non-plate method
What is the requirement when using plate method for sampling from roadway? -
ANSWER-1. Plate is placed 10' Infront of paver and at least 2' on the inside edge of the
mat
2. 3 samples must be acquired
What are the requirements when sampling from a paver? - ANSWER-1. Trim 8-12"
before taking sample
2. Remove 6-10" of material in center of hopper
3. Take sample directly into vertical face
What are the requirements for sampling from stockpiles? - ANSWER-1. Remove 4" of
outermost layer
2. Obtain sample as close as possible to the intersection of horizontal and vertical face.
How many sections should be split from a sample container when " sample splitting"? -
ANSWER-4
What are the requirements for sampling from a loaded truck? - ANSWER-1. Truck
should be split into 4 different quadrants
2. Remove 4" of outermost layer
, 3. 3 increments placed on sample container
What is open-graded Asphalt? - ANSWER-Top course permeable layer that supports
drainage, tire dampening and road spray
What is dense-graded Asphalt? - ANSWER-Base or binder course that have larger
nominal size aggregates. Low water impermeability, strength and improves freeze/thaw
cycles
Existing surface preparation inspection: Structurally Sound - ANSWER-Cracks and
other structural defects must be prepared to minimize reflective cracking. surface must
be non-compressible and capable of bearing traffic loads
Existing surface preparation: Well Drained - ANSWER-1. Surface must not be
undermined by water intrusion.
2. Water should not collect around roadbed
3. Roadbed should promote positive drainage
Existing Surface Preparation: Properly Graded - ANSWER-Elevation prepared to proper
slope and crown
When is paving on subgrade not recommended? - ANSWER-When optimum moisture
content is over 4% or area is frozen
What is the required compaction rating? - ANSWER-95% compaction
What can be done is soil conditions are to dry when compacting? - ANSWER-Water can
be applied, but must be closely monitored
What equipment is recommended for sandy/granular soil conditions? - ANSWER-
Vibratory rollers/ compactors
What equipment is recommended for silt/clay soil conditions? - ANSWER-Tamping Foot
Rollers
What is another method to test soil compaction besides nuclear density gauge? -
ANSWER-Proof Rolling: Method of utilizing a loaded truck and measuring indentations.
Soils that exhibit proper compaction should reveal 1/8" indentation. Poorly compacted
areas reveal more than a 1/8"
What equipment should be utilized around drainage structures, tight spaces or turns to
achieve compaction? - ANSWER-Hand tamps or plate tampers
What type of amplitude compaction is recommended for crushed stone bases? -
ANSWER-High to low frequencies
