FDOT Asphalt Paving Level 2 Questions And Answers Verified 100% Correct

FDOT Asphalt Paving Level 2 Questions And Answers Verified 100% Correct How do you calculate the tolerance for the asphalt spread rate target? - ANSWER Ex: Target Spread Rate = 165 lb/syds 165 x 0.05 (%5) = 8 lb/syd Then you use the 8 as a + or - from 165 so the range is from 157 to 173 lbs/syd Formula for determining the asphalt spread rate for an FC-5 mix? - ANSWER target spread rate = thickness x gsb (from mix design) x 40.5 (round to the nearest whole number) A prime coat being used on lime rock, sand-clay, shell, and shell stabilized based have an application rate of what? - ANSWER Limerock: greater than or equal to 0.10 gal/syd Sand-Clay, Shell, Shell Base: greater than or equal to 0.15 gal/syd You do not test overbuild for density unless it is? - ANSWER Greater than one inch Where do you find approved tack products? - ANSWER On the FDOT Approved products list (APL) During night what is the tack you usually use? - ANSWER PG 52-28 or an approved emulsion What tack an you use during the day? - ANSWER Any kind of tack When determining the specification rate for 52-28 tack you do what? - ANSWER Multiply the rate by 0.6 What is the tack application rate tolerance? - ANSWER +/- 0.01 gal/syd Step 1 for figuring the tack spread rate - ANSWER Find the length of the tack shot Station - station = ft Step 2 for figuring the tack spread rate - ANSWER Find the square yards feet x width / 9 = syds Step 3 for figuring the tack spread rate - ANSWER Use the distributor chart to find the gallons used start 11/13 - 1319 gal end 18/14 - 1140 gal = gallons used Step 4 for figuring the tack spread rate - ANSWER Find the correction factor on the temperature sheet corresponding to the correct liquid to convert the gallons to 60F EX: 160F correction factor = 0.9756 gallons used x correction factor = gallons at 60F Step 5 for figuring the tack spread rate - ANSWER gallons used at 60F / syds = tack spread rate What is the application rate for ARMI layers? - ANSWER 0.6 - 0.8 gal/syd Use the AC(ARB) temperature correction factor What is the spread rate for the chip spreader? - ANSWER 0.26 to 0.33 ft/syd with the actual spread rate determined by the engingeer What is the minimum thickness for asphalt being placed over an ARMI layer? - ANSWER 1 1/2 inches unless plans call for a thicker mat Where should you stick a thermometer in a truck? - ANSWER The hole should be 1/4 of an inch In the middle third of the length of the body and 6 to 10 inches above the bottom of the bed How much asphalt should be in front of the screed being mixed by the augers? - ANSWER The proper head of material is at the center of the auger shaft While the paver is moving the augers should be moving - ANSWER 80 - 90 % of the time Screed heaters can not be used to do what - ANSWER raise the heat of the mix When matching paved joints you must have a - ANSWER Joint matcher ( sonic or shoe paddles) The ski pole for the join matcher has to be how long - ANSWER 25ft Longitudinal (horizontal when facing down the road) joint should always be staggered how far apart - ANSWER 6 to 12 inches While paving an unsupported edge the edge can no deviate more than how far from the string line? - ANSWER +/- 1.5" Tapers are required on joints when the adjacent travel lanes has a difference in elevation - ANSWER greater than 1 1/2 For the rolling straight edge the deficiencies must be fixed when - ANSWER greater than 3/16' Mark 50 feet from each side of the start and end of the deficiency What is the compaction temperature range? - ANSWER 180 - 300F Anything below is the stop point, can't achieve any more compaction The formula for Pounds per linear inch is - ANSWER PLI = roller weight LB / sum of drum widths IN To increase the compactive effort you can - ANSWER Increase the air pressure (traffic roller)