SCDOT ASPHALT ROADWAY
TECHNICIAN EXAM
What to do if you see segregation? - ANSWERS-Communicate,
determine source and stop/slow production.
Paving Preparations for Longitudinal Joints - ANSWERS-Set up paint
or string lines to assist equipment operators/drivers in maintaining
straight lines during the paving operation.
Reference Device for Equipment - ANSWERS-Attach a reference
chain or other device to equipment so the reference lines can be easily
followed by the paver operator.
Clean Joint Area - ANSWERS-Clean the joint area to ensure
excessively loose material is removed prior to paving.
Apply Additional Tack at Joint Face - ANSWERS-Apply additional
tack at the joint face using a spray bar to assist with cohesion at the
joint.
Tack Application Width - ANSWERS-Tack a few inches past the full
paving width to ensure the unrestricted edge will have the minimum
movement in the compaction process.
,Stagger Construction of Multiple Lifts - ANSWERS-Stagger the
construction of multiple lifts to avoid multiple joints placed in the
same location.
Allow Time for Tack to Cure - ANSWERS-Allow time for the tack to
properly cure (break) before placing the layer of asphalt to minimize
movement during the compaction process.
Joint Extension for Overlap - ANSWERS-Ensure that the gate is
extended far enough to allow for approximately 1 inch to 1.5 inch of
overlap. This prevents starving the joint.
Paving Operations - ANSWERS-Ensure that the height of the loose
lift is higher than the adjacent lift.
Properly Lute the Joint - ANSWERS-Properly lute the joint, only if
necessary, to prevent pushing material out of and away from the joint.
Maintain Uniform Head of Material - ANSWERS-Maintain a uniform
head of material at the auger points to ensure enough material is
consistently at the joints throughout the paving process.
Compaction First Pass - ANSWERS-Ensure that the first pass of the
breakdown roller is approximately 6 inches away from the joint.
Material Compression Towards Joint - ANSWERS-This ensures the
material is being compressed towards the joint.
,Compaction - ANSWERS-After the initial pass, overlap the joint in
all remaining passes with all rollers.
Stone Matrix Asphalt (SMA) Components - ANSWERS-Coarse
Aggregate, Fine Aggregate, Mineral Filler, Asphalt Binder, Modifier
consisting of Fiber or Binder Modifier.
Stone Matrix Asphalt (SMA) Theory - ANSWERS-Stone skeleton to
resist permanent deformation (Stone on Stone Contact), Mortar for
thick binder films.
Open Graded Friction Course (OGFC) - ANSWERS-Stone skeleton,
One size aggregate, Thick binder films, No fine aggregate, High air
voids.
Open Graded Friction Course (OGFC) Characteristics - ANSWERS-
Friction, Reduces splash and spray from rain, Reduces noise levels.
Open Graded Friction Course (OGFC) Production - ANSWERS-
Insertion of mineral filler, Insertion of modifier.
Preventative Maintenance Thin Lift Surface - ANSWERS-HMA
overlay consisting of one lift of surface course approximately .75
inches thick to preserve pavement structure.
, Preventative Maintenance Thin Lift Surface Expected Life Span -
ANSWERS-6 to 8 years.
Preventative Maintenance Thin Lift Surface Benefits - ANSWERS-
Marginally effective for all types of pavement distresses, Improve
smoothness, Improve skid resistance and drainage issues, Correct
surface defects, Enhance appearance, Reduce Tire Noise, Minor
amount of structural enhancement.
Preventative Maintenance Thin Lift Surface Disadvantages -
ANSWERS-Subject to delamination and reflective cracking, Grade
issues may be a problem without milling, Higher initial cost than
other pavement preservation applications.
Preventative Maintenance Thin Lift Surface Preparation -
ANSWERS-Seal all cracks > 1/4 inches at least 6 months prior. If lots
of smaller cracks, should consider an asphalt surface treatment. May
not be best option if rutting > .5 inches is present. Full Depth Patch.
Existing surface needs to be cleaned. Proper tack coat is vital.
Preventative Maintenance Thin Lift Surface Mix Temperatures -
ANSWERS-Follows the HMA Temperature Requirements July 2010
Supplemental Spec PG 64-22: 265 F to 325 F, PG 76-22: 300 F to 350
F.
Preventative Maintenance Thin Lift Surface Compaction -
ANSWERS-January 2012 Supplemental spec (Section 412.5.3) 8-12
ton tandem steel wheel roller, Minimum of 2 passes, Cease rolling
once mixture is properly seated to underlying surface.
TECHNICIAN EXAM
What to do if you see segregation? - ANSWERS-Communicate,
determine source and stop/slow production.
Paving Preparations for Longitudinal Joints - ANSWERS-Set up paint
or string lines to assist equipment operators/drivers in maintaining
straight lines during the paving operation.
Reference Device for Equipment - ANSWERS-Attach a reference
chain or other device to equipment so the reference lines can be easily
followed by the paver operator.
Clean Joint Area - ANSWERS-Clean the joint area to ensure
excessively loose material is removed prior to paving.
Apply Additional Tack at Joint Face - ANSWERS-Apply additional
tack at the joint face using a spray bar to assist with cohesion at the
joint.
Tack Application Width - ANSWERS-Tack a few inches past the full
paving width to ensure the unrestricted edge will have the minimum
movement in the compaction process.
,Stagger Construction of Multiple Lifts - ANSWERS-Stagger the
construction of multiple lifts to avoid multiple joints placed in the
same location.
Allow Time for Tack to Cure - ANSWERS-Allow time for the tack to
properly cure (break) before placing the layer of asphalt to minimize
movement during the compaction process.
Joint Extension for Overlap - ANSWERS-Ensure that the gate is
extended far enough to allow for approximately 1 inch to 1.5 inch of
overlap. This prevents starving the joint.
Paving Operations - ANSWERS-Ensure that the height of the loose
lift is higher than the adjacent lift.
Properly Lute the Joint - ANSWERS-Properly lute the joint, only if
necessary, to prevent pushing material out of and away from the joint.
Maintain Uniform Head of Material - ANSWERS-Maintain a uniform
head of material at the auger points to ensure enough material is
consistently at the joints throughout the paving process.
Compaction First Pass - ANSWERS-Ensure that the first pass of the
breakdown roller is approximately 6 inches away from the joint.
Material Compression Towards Joint - ANSWERS-This ensures the
material is being compressed towards the joint.
,Compaction - ANSWERS-After the initial pass, overlap the joint in
all remaining passes with all rollers.
Stone Matrix Asphalt (SMA) Components - ANSWERS-Coarse
Aggregate, Fine Aggregate, Mineral Filler, Asphalt Binder, Modifier
consisting of Fiber or Binder Modifier.
Stone Matrix Asphalt (SMA) Theory - ANSWERS-Stone skeleton to
resist permanent deformation (Stone on Stone Contact), Mortar for
thick binder films.
Open Graded Friction Course (OGFC) - ANSWERS-Stone skeleton,
One size aggregate, Thick binder films, No fine aggregate, High air
voids.
Open Graded Friction Course (OGFC) Characteristics - ANSWERS-
Friction, Reduces splash and spray from rain, Reduces noise levels.
Open Graded Friction Course (OGFC) Production - ANSWERS-
Insertion of mineral filler, Insertion of modifier.
Preventative Maintenance Thin Lift Surface - ANSWERS-HMA
overlay consisting of one lift of surface course approximately .75
inches thick to preserve pavement structure.
, Preventative Maintenance Thin Lift Surface Expected Life Span -
ANSWERS-6 to 8 years.
Preventative Maintenance Thin Lift Surface Benefits - ANSWERS-
Marginally effective for all types of pavement distresses, Improve
smoothness, Improve skid resistance and drainage issues, Correct
surface defects, Enhance appearance, Reduce Tire Noise, Minor
amount of structural enhancement.
Preventative Maintenance Thin Lift Surface Disadvantages -
ANSWERS-Subject to delamination and reflective cracking, Grade
issues may be a problem without milling, Higher initial cost than
other pavement preservation applications.
Preventative Maintenance Thin Lift Surface Preparation -
ANSWERS-Seal all cracks > 1/4 inches at least 6 months prior. If lots
of smaller cracks, should consider an asphalt surface treatment. May
not be best option if rutting > .5 inches is present. Full Depth Patch.
Existing surface needs to be cleaned. Proper tack coat is vital.
Preventative Maintenance Thin Lift Surface Mix Temperatures -
ANSWERS-Follows the HMA Temperature Requirements July 2010
Supplemental Spec PG 64-22: 265 F to 325 F, PG 76-22: 300 F to 350
F.
Preventative Maintenance Thin Lift Surface Compaction -
ANSWERS-January 2012 Supplemental spec (Section 412.5.3) 8-12
ton tandem steel wheel roller, Minimum of 2 passes, Cease rolling
once mixture is properly seated to underlying surface.
