FDOT ASPHALT PAVING LEVEL 1 REVIEW SET
QUESTIONS AND ANSWERS SURE A+
✔✔During core sampling the barrel should always be - ✔✔perpendicular to pavement
✔✔Core sampling patching - ✔✔Fill hole with patch mix, if in lifts tamp each lift
✔✔Storing cores - ✔✔Store in ice chest with bagged ice on top or put in an air
conditioned cab
Best stored upright in a cool place
DO NOT THROW INTO PICKUP
✔✔Determine Bulk Specific gravity on sampled cores - ✔✔Trim to correct lift
Weigh dry sample if dry otherwise
Place in water (77+-2) for 4+-1 minute
Then roll within five seconds to achieve SSD weight
Then dry to a constant weight with fan or core dryer
✔✔Bulk Specific Gravity formula - ✔✔dry / SSD - water weight = BSG
✔✔Asphalt Temperature Heat and Cold - ✔✔Too hot cooks asphalt
Too cold can't compact
✔✔The hole for temping asphalt trucks should be located where - ✔✔Hole located in
the middle third of length of truck; 6-10 inches above the bed
✔✔Temping asphalt on the top - ✔✔At engineer's discretion
✔✔Asphalt Temperature Master Range - ✔✔+-30; reject loads outside
✔✔Temp every load monitored if - ✔✔Mix within master range
Differes for a single load from established temp by +-25°F
, Avg of five loads differes by +-15°F
Monitor until within tolerance
✔✔Tack Distributor without a calibration chart - ✔✔If they don't have a calibration chart
you can not use them to distribute tack
✔✔Application rate of tack for close graded mixes - ✔✔Normal: 0.02-0.08 gal/yd^2
Must apply temperature correction factor
✔✔Calibration chart for distributor of tack - ✔✔Must be done by a reliable and
recognized firm
Chart provided to engineer prior to use
Know the temperature of asphalt cement being used for Tack coat
✔✔Measuring tack levels - ✔✔Stick the distributor before and after spraying tack
Use calibration chart for Distributor to determine amount of asphalt in truck before and
after spraying
✔✔Formula for finding the length of a tacked road - ✔✔Find length of tacked road
Station - station = station lineal feet
or
feet - feet = lineal feet
Then determine square yards of lineal feet
lineal feet X width / 9 = syds
✔✔Using what chart to calculate start and end readings to find how many gallons were
used - ✔✔Use distributor chart to calculate readings
Start reading 11/13 = 1319g
End 18/14 = 1140g
Gallons used = 179g
✔✔Using a temperature correction chart to find gallons used at 60F - ✔✔Correct
gallons from 160°F to 60°F
Using a temperature correction chart
gallons at 60°F = gallons at 160°F X Correction factor
✔✔Calculating HMA placement yield for what reasons - ✔✔Structural design thickness
Adjusting cross-slope and grade
Calculate periodically and at the end of the day
✔✔HMA placement yield formula - ✔✔Amount used (lbs) / area covered syds = yield
QUESTIONS AND ANSWERS SURE A+
✔✔During core sampling the barrel should always be - ✔✔perpendicular to pavement
✔✔Core sampling patching - ✔✔Fill hole with patch mix, if in lifts tamp each lift
✔✔Storing cores - ✔✔Store in ice chest with bagged ice on top or put in an air
conditioned cab
Best stored upright in a cool place
DO NOT THROW INTO PICKUP
✔✔Determine Bulk Specific gravity on sampled cores - ✔✔Trim to correct lift
Weigh dry sample if dry otherwise
Place in water (77+-2) for 4+-1 minute
Then roll within five seconds to achieve SSD weight
Then dry to a constant weight with fan or core dryer
✔✔Bulk Specific Gravity formula - ✔✔dry / SSD - water weight = BSG
✔✔Asphalt Temperature Heat and Cold - ✔✔Too hot cooks asphalt
Too cold can't compact
✔✔The hole for temping asphalt trucks should be located where - ✔✔Hole located in
the middle third of length of truck; 6-10 inches above the bed
✔✔Temping asphalt on the top - ✔✔At engineer's discretion
✔✔Asphalt Temperature Master Range - ✔✔+-30; reject loads outside
✔✔Temp every load monitored if - ✔✔Mix within master range
Differes for a single load from established temp by +-25°F
, Avg of five loads differes by +-15°F
Monitor until within tolerance
✔✔Tack Distributor without a calibration chart - ✔✔If they don't have a calibration chart
you can not use them to distribute tack
✔✔Application rate of tack for close graded mixes - ✔✔Normal: 0.02-0.08 gal/yd^2
Must apply temperature correction factor
✔✔Calibration chart for distributor of tack - ✔✔Must be done by a reliable and
recognized firm
Chart provided to engineer prior to use
Know the temperature of asphalt cement being used for Tack coat
✔✔Measuring tack levels - ✔✔Stick the distributor before and after spraying tack
Use calibration chart for Distributor to determine amount of asphalt in truck before and
after spraying
✔✔Formula for finding the length of a tacked road - ✔✔Find length of tacked road
Station - station = station lineal feet
or
feet - feet = lineal feet
Then determine square yards of lineal feet
lineal feet X width / 9 = syds
✔✔Using what chart to calculate start and end readings to find how many gallons were
used - ✔✔Use distributor chart to calculate readings
Start reading 11/13 = 1319g
End 18/14 = 1140g
Gallons used = 179g
✔✔Using a temperature correction chart to find gallons used at 60F - ✔✔Correct
gallons from 160°F to 60°F
Using a temperature correction chart
gallons at 60°F = gallons at 160°F X Correction factor
✔✔Calculating HMA placement yield for what reasons - ✔✔Structural design thickness
Adjusting cross-slope and grade
Calculate periodically and at the end of the day
✔✔HMA placement yield formula - ✔✔Amount used (lbs) / area covered syds = yield
